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general description the MAX9975 dual, low-power, high-speed, pin elec- tronics driver/comparator with 35ma load ic includes, for each channel, a three-level pin driver, a dual com- parator, variable clamps, and an active load. an addi- tional differential comparator allows comparisons between the two channels. the driver features a wide voltage range and high-speed operation, includes high- impedance and active-termination (3rd-level drive) modes, and is highly linear even at low voltage swings. the dual comparator provides low dispersion (timing variation) over a wide variety of input conditions, and differential outputs. the clamps provide damping of high-speed device-under-test (dut) waveforms when the device is configured as a high-impedance receiver. the programmable load supplies up to 35ma of source and sink current. the load facilitates contact/continuity testing, at-speed parametric testing of i oh and i ol , and pullup of high-output-impedance devices. the MAX9975 provides high-speed, differential control inputs and open-collector outputs with internal 50 ter- mination resistors that make it cml compatible. these features significantly reduce the discrete component count on the circuit board. a 3-wire, low-voltage, cmos-compatible serial inter- face programs the low-leakage and tri-state/terminate operational configurations of the MAX9975. the MAX9975arccq operating range is -1.5v to +6.5v. the MAX9975azccq operating range is -1.0v to +7.0v. the MAX9975 features power dissipation of only 1.6w per channel. the device is available in a 100-pin, 14mm x 14mm x 0.1mm body, and 0.5mm pitch tqfp. an exposed 8mm x 8mm die pad on the top of the package facilitates efficient heat removal. the device is specified to operate with an internal die temperature of +60? to +100?, and features a die temperature monitor output. applications medium-performance commodity memory ate features ? low 1.6w/channel (typ) power dissipation ? greatly reduced power penalty when load commutated ? high speed: 1200mbps at 3v p-p and 1800mbps at 1v p-p ? programmable 35ma active-load current ? low timing dispersion ? wide -1.5v to +6.5v (MAX9975ar) or -1.0v to +7.0v (MAX9975az) operating range ? active termination (3rd-level drive) ? integrated clamps ? integrated differential comparator ? interfaces easily with most logic families ? internal 50 termination resistors ? low gain and offset errors ? comparator hysteresis control from 0v to 15mv MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load ________________________________________________________________ maxim integrated products 1 ordering information 19-0242; rev 0; 6/05 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. * future product?ontact factory for availability. ** epr = exposed pad reversed (top). + denotes lead-free package. pin configuration and selector guide appear at end of data sheet. part temp range pin-package MAX9975arccq 0? to +70? 100 tqfp-epr** MAX9975arccq+ 0? to +70? 100 tqfp-epr** MAX9975azccq* 0? to +70? 100 tqfp-epr** MAX9975azccq+* 0? to +70? 100 tqfp-epr**
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, t j = +85?, unless otherwise noted. all temperature coeffi- cients are measured at t j = +60? to +100?, unless otherwise noted.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. MAX9975ar v cc to gnd .......................................................-0.3v to +11v v ee to gnd .....................................................-5.75v to +0.3v dut_ to gnd ..................................................-2.75v to +7.5v dhv_, dlv_, dtv_, chv_, clv_, com_ to gnd...............................................................-2.5v to +7.5v cphv_ to gnd .................................................-1.0v to +8.5v cplv_ to gnd...................................................-3.5v to +6.0v dut_ short circuit to -1.5v to +6.5v......................continuous MAX9975az v cc to gnd .....................................................-0.3v to +11.5v v ee to gnd......................................................-5.25v to +0.3v dut_ to gnd...................................................-2.25v to +8.0v dhv_, dlv_, dtv_, chv_, clv_, com_ to gnd...............................................................-2.0v to +8.0v cphv_ to gnd ..................................................-0.5v to +9.0v cplv_ to gnd...................................................-3.0v to +6.5v dut_ short circuit to -1.0v to +7.0v......................continuous v cc - v ee ...........................................................-0.3v to +16.75v gs to gnd .............................................................................?v ldh_, ldl_ to gnd .................................................-0.3v to +6v data_, ndata_, rcv_, nrcv_ to gnd .................-2.5v to +5v lden_, nlden_ to gnd..........................................-2.5v to +5v data_ to ndata_, rcv_ to nrcv_, lden_ to nlden_ ......?.5v tdata_, tlden_ to gnd ........................................-2.5v to +5v data_, ndata_ to tdata_..................................................?v lden_, nlden_ to tlden_..................................................?v v cco_ to gnd ..........................................................-0.3v to +5v sclk, din, cs , rst to gnd ......................................-1v to +5v dhv_ to dlv_ ......................................................................?0v dhv_ to dtv_ ......................................................................?0v dlv_ to dtv_.......................................................................?0v chv_ or clv_ to dut_ ........................................................?0v ch_, nch_, cl_, ncl_ to gnd..................................-1v to +5v hys_ current ........................................................-1ma to +1ma all other pins to gnd ......................(v ee - 0.3v) to (v cc + 0.3v) temp current...................................................-0.5ma to +20ma power dissipation (t a = +70?) 100-pin tqfp-epr (derate 167mw/? above +70?) ...............................................................13.3w* storage temperature range .............................-65? to +150? junction temperature .....................................................+150? lead temperature, lead-free (soldering, 10s)...............+260? lead temperature, leaded (soldering, 10s)...................+300? parameter symbol conditions min typ max units power supplies MAX9975ar 9.5 9.75 10.5 positive supply v cc MAX9975az 10.0 10.25 11.0 v MAX9975ar -5.25 -4.75 -4.50 negative supply v ee MAX9975az -4.75 -4.25 -4.00 v v ldh _ = v ldl _ = 0v, r l 10m 10m dissipation wattage values are based on still air with no heat sink. actual maximum power dissipation is a function of heat-ext raction techniques and may be substantially higher.
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load _______________________________________________________________________________________ 3 electrical characteristics (continued) (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, t j = +85?, unless otherwise noted. all temperature coeffi- cients are measured at t j = +60? to +100?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units dut_ characteristics MAX9975ar -1.5 +6.5 operating voltage range (note 4) v dut MAX9975az -1.0 +7.0 v MAX9975ar lleak = 0, v dut _ = -1.5v, 0v, +3v, +6.5v ? leakage current in high- impedance mode i dut MAX9975az lleak = 0, v dut _ = -1v, 0v, +3v, +7v ? ? MAX9975ar lleak = 1, v dut _ = -1.5v, 0v, +3v, +6.5v ?5 leakage current in low-leakage mode MAX9975az lleak = 1, v dut _ = -1v, 0v, +3v, +7v ?5 na driver in term mode (dut_ = dtv_) 3 5 combined capacitance c dut driver in high-impedance mode 5 6 pf low-leakage enable time (notes 5, 6) 20 ? low-leakage disable time (notes 6, 7) 0.1 ? control and levels inputs level programming inputs (dhv_, dlv_, dtv_, chv_, clv_, cphv_, cplv_, com_, ldh_, ldl_) input bias current i bias ?5 ? settling time to 0.1% of full-scale change 1 s differential control inputs (data_, ndata_, rcv_, nrcv_, lden_, nlden_) input high voltage v ih 0 3.5 v input low voltage v il -0.2 +3.2 v between differential inputs ?.15 ?.00 differential input voltage v diff between a differential input and its termination voltage ?.9 v input bias current ?5 ? input termination voltage v tdata _ v tlden _ 0 +3.5 v input termination resistor between signal and corresponding termination voltage input 47.5 52.5 single-ended control inputs ( cs , sclk, din, rst ) internal threshold reference v thrint 1.05 1.25 1.45 v internal reference output resistance r o 20 k external threshold reference v thr 0.43 1.73 v input high voltage v ih v thr + 0.2 3.5 v input low voltage v il -0.1 v thr - 0.2 v input bias current i b ?5 ?
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load 4 _______________________________________________________________________________________ electrical characteristics (continued) (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, t j = +85?, unless otherwise noted. all temperature coeffi- cients are measured at t j = +60? to +100?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units serial interface timing (figure 6) sclk frequency f sclk 50 mhz sclk pulse-width high t ch 8ns sclk pulse-width low t cl 8ns cs low to sclk high setup t css0 3.5 ns cs high to sclk high setup t css1 3.5 ns sclk high to cs high hold t csh1 3.5 ns din to sclk high setup t ds 3.5 ns din to sclk high hold t dh 3.5 ns cs pulse-width high t cswh 20 ns temperature monitor (temp) nominal voltage t j = +70?, r l 10m 3.33 v temperature coefficient +10 mv/? output resistance 20 k drivers (note 8) dc output characteristics (r l 10m ) dhv_, dlv_, dtv_, output offset voltage v os at dut_ with v dhv _, v dtv _, v dlv _ independently tested at +1.5v ?5 mv v gs = +100mv, v dhv _ = 6.5v + 100mv ? MAX9975ar v gs = -100mv, v dlv _ = -1.5v - 100mv ? v gs = +100mv, v dhv _ = 7v + 100mv ? output offset voltage due to ground sense v gsos MAX9975az v gs = -100mv, v dlv _ = -1v - 100mv ? mv dhv_, dlv_, dtv_ output-offset temperature coefficient +200 ?/? dhv_, dlv_, dtv_ gain a v measured with v dhv _, v dlv _, and v dtv _ at 0v and 4.5v 0.997 1.00 1.003 v/v dhv_, dlv_, dtv_ gain temperature coefficient -50 ppm/? v dut _ = 1.5v, 3v (note 9) ? linearity error full range (notes 9, 10) ?5 mv MAX9975ar v dlv _ = 0v, v dhv _ = 200mv, 6.5v ? dhv_ to dlv_ crosstalk MAX9975az v dlv _ = 0v, v dhv _ = 200mv, 7v ? mv
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load _______________________________________________________________________________________ 5 electrical characteristics (continued) (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, t j = +85?, unless otherwise noted. all temperature coeffi- cients are measured at t j = +60? to +100?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units MAX9975ar v dhv _ = 5v, v dlv _ = -1.5v, +4.8v ? dlv_ to dhv_ crosstalk MAX9975az v dhv _ = 5v, v dlv _ = -1v, +4.8v ? mv MAX9975ar v dhv _ = 3v, v dlv _ = 0v, v dtv _ = -1.5v, +6.5v ? dtv_ to dlv_ and dhv_ crosstalk MAX9975az v dhv _ = 3v, v dlv _ = 0v, v dtv _ = -1v, +7v ? mv dhv_ to dtv_ crosstalk v dtv _ = 1.5v, v dlv _ = 0v, v dhv _ = 1.6v, 3v ? mv dlv_ to dtv_ crosstalk v dtv _ = 1.5v, v dhv _ = 3v, v dlv _ = 0v, 1.4v ? mv dhv_, dtv_, dlv_ dc power- supply rejection ratio psrr (note 11) ?8 mv/v maximum dc drive current i dut _ ?0 ?0 ma dc output resistance r dut _i dut _ = ?0ma (note 12) 47 48 49 i dut _ = ?ma, ?ma 0.5 1 dc output resistance variation r dut _ i dut _ = ?ma, ?ma, ?5ma, ?0ma 0.75 1.5 dynamic output characteristics (z l = 50 ) ac drive current ?0 ma v dlv _ = 0v, v dhv _ = 0.1v 15 22 v dlv _ = 0v, v dhv _ = 1v 110 130 drive-mode overshoot v dlv _ = 0v, v dhv _ = 3v 210 370 mv v dlv _ = 0v, v dhv _ = 0.1v 4 11 v dlv _ = 0v, v dhv _ = 1v 20 65 drive-mode undershoot v dlv _ = 0v, v dhv _ = 3v 30 185 mv v dut_ = 1.0v p-p , t r = t f = 250ps, 10% to 90% 60 150 term-mode overshoot (note 13) v dut_ = 3.0v p-p , t r = t f = 500ps, 10% to 90% 0 mv v dhv _ = v dtv _ = 1v, v dlv _ = 0v 180 250 term-mode spike v dlv _ = v dtv _ = 0v, v dhv _ = 1v 180 250 mv v dlv _ = -1.0v, v dhv _ = 0v 100 high-impedance-mode spike v dlv _ = 0v, v dhv _ = 1v 100 mv settling time to within 25mv 3v step (note 14) 4 ns settling time to within 5mv 3v step (note 14) 40 ns
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load 6 _______________________________________________________________________________________ electrical characteristics (continued) (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, t j = +85?, unless otherwise noted. all temperature coeffi- cients are measured at t j = +60? to +100?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units timing characteristics (z l = 50 ) (note 15) prop delay, data to output t pdd 1.2 1.5 1.9 ns prop-delay match, t lh vs. t hl 3v p-p ?0 ?00 ps prop-delay match, drivers within package (note 16) 40 ps prop-delay temperature coefficient +1.6 ps/? 0.2v p-p , 40mhz, 0.6ns to 24.4ns pulse width, relative to 12.5ns pulse width ?5 ?0 1v p-p , 40mhz, 0.6ns to 24.4ns pulse width, relative to 12.5ns pulse width ?5 ?0 3v p-p , 40mhz, 0.9ns to 24.1ns pulse width, relative to 12.5ns pulse width ?5 ?0 prop-delay change vs. pulse width 5v p-p , z l = 500 , 40mhz, 1.4ns to 23.6ns pulse width, relative to 12.5ns pulse width ?00 ps MAX9975ar v dhv _ - v dlv _ = 1v, v dhv _ = 0 to 6v 50 75 prop-delay change vs. common- mode voltage MAX9975az v dhv _ - v dlv _ = 1v, v dhv _ = 0.5v to 6.5v 50 75 ps prop delay, drive to high impedance t pddz v dhv _ = 1.0v, v dlv _ = -1.0v, v dtv _ = 0v 1.6 2.1 2.6 ns prop delay, high impedance to drive t pdzd v dhv _ = 1.0v, v dlv _ = -1.0v, v dtv _ = 0v 2.6 3.2 3.9 ns p r op - d el ay m atch, t p d d z vs. t p d z d -1.5 -1.1 -0.7 ns prop-delay match, t pddz vs. t lh 0.2 0.6 1.0 ns prop delay, drive to term t pddt v dhv _ = 3v, v dlv _ = 0v, v dtv _ = 1.5v 1.3 1.8 2.3 ns prop delay, term to drive t pdtd v dhv _ = 3v, v dlv _ = 0v, v dtv _ = 1.5v 1.6 2.1 2.7 ns p r op - d el ay m atch, t p d d t vs. t p d t d -0.7 -0.3 +0.1 ns prop-delay match, t pddt vs. t lh -0.1 +0.3 +0.7 ns dynamic performance (z l = 50 ) 0.2v p-p , 10% to 90% 300 350 400 1v p-p , 10% to 90% 330 390 450 2v p-p 430 500 570 3v p-p , 10% to 90% 500 650 750 rise and fall time t r , t f 5v p-p , z l = 500 , 10% to 90% 800 1000 1200 ps rise and fall time match t r vs. t f 3v p-p , 10% to 90% ?0 ps
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load _______________________________________________________________________________________ 7 electrical characteristics (continued) (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, t j = +85?, unless otherwise noted. all temperature coeffi- cients are measured at t j = +60? to +100?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units 0.2v p-p 550 1v p-p 550 630 2v p-p 650 750 3v p-p 850 1000 minimum pulse width (note 17) 5v p-p , z l = 500 comparators (note 8) comparator dc characteristics MAX9975ar -1.5 +6.5 input voltage range (note 4) v in MAX9975az -1.0 +7.0 v differential input voltage v diff ? v input offset voltage v os v dut _ = 1.5v ?0 mv input offset-voltage temperature coefficient ?0 ?/? MAX9975ar v dut _ = -1.5v, +6.5v ?.25 ? common-mode rejection ratio (note 21) cmrr MAX9975az v dut _ = -1v, +7v ?.25 ? mv/v v dut _ = 1.5v, 3v ? MAX9975ar v dut _ = -1.5v, +6.5v ?0 v dut _ = 1.5v, 3v ? linearity error (note 9) MAX9975az v dut _ = -1v, +7v ?0 mv power-supply rejection ratio (note 11) psrr v dut _ = 1.5v ?.035 ? mv/v comparator hysteresis r hys = open 0 r hys = 5k 2 r hys = 3.8k 5 r hys = 2.9k 10 input hysteresis r hys = 2.3k 15 mv
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load 8 _______________________________________________________________________________________ electrical characteristics (continued) (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, t j = +85?, unless otherwise noted. all temperature coeffi- cients are measured at t j = +60? to +100?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units comparator ac characteristics (note 22) term mode, t r = t f = 150ps 1.5 2.5 bandwidth high-impedance mode 0.5 0.7 ghz minimum pulse width (note 23) t pw ( min ) 500 650 ps prop delay t pdl 0.9 1.3 1.7 ns prop-delay temperature coefficient +1.7 ps/? prop-delay match, high/low vs. low/high ?0 ?0 ps prop-delay match high vs. low comparator ?0 ps prop-delay match, comparators within package (note 16) ?0 ps MAX9975ar v chv_ = v clv_ = -1.4v to +6.4v 40 60 prop-delay dispersion vs. common-mode input (note 24) MAX9975az v chv_ = v clv_ = -0.9v to +6.9v 40 60 ps v chv_ = v clv_ = 0.1v to 0.9v, v dut _ = 1v p-p , t r = t f = 250ps, 10% to 90% relative to timing at 50% point ?0 ?0 prop-delay dispersion vs. overdrive v chv_ = v clv_ = 40mv to 160mv, v dut _ = 0.2v p-p , t r = t f = 150ps, 10% to 90% relative to timing at 50% point ?0 ?0 ps prop-delay dispersion vs. pulse width 0.6ns to 24.4ns pulse width, relative to 12.5ns pulse width ?0 ?0 ps prop-delay dispersion vs. slew rate 0.5v/ns to 6v/ns slew rate, relative to 4v/ns slew rate ?0 ?0 ps v dut _ = 1.0v p-p , t r = t f = 250ps, term mode, 10% to 90% relative to timing at 50% point ?0 ?0 v dut _ = 1.0v p-p , t r = t f = 250ps, high-impedance mode, 10% to 90% relative to timing at 50% point ?50 ?50 waveform tracking 10% to 90% v dut _ = 3v p-p , t r = t f = 500ps, high-impedance mode, 10% to 90% relative to timing at 50% point ?50 ?00 ps term mode 6 dut_ slew-rate tracking high-impedance mode 5 v/ns
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load _______________________________________________________________________________________ 9 electrical characteristics (continued) (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, t j = +85?, unless otherwise noted. all temperature coeffi- cients are measured at t j = +60? to +100?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units comparator logic outputs (ch_, nch_, cl_, ncl_) v cco _ voltage range v vcco _ 1.5 3.5 v v cco _ current i vcco _64ma output low voltage compliance set by i ol , r term , and v cco _ -0.5 v output high voltage v oh i ch _ = i nch _ = i cl _ = i ncl _ = 0 v cco_ - 0.1 v cco_ - 0.01 v cco_ + 0.02 v output low voltage v ol i ch _ = i nch _ = i cl _ = i ncl _ = 0 v cco_ - 0.8 v output voltage swing i ch _ = i nch _ = i cl _ = i ncl _ = 0 760 800 840 mv internal output termination resistor r term single-ended measurement from v cco _ to ch_, nch_, cl_, ncl_ 48 52 differential rise and fall times t r , t f 20% to 80% 210 250 ps clamps MAX9975ar 0 7.5 high-clamp input voltage range v cph _ MAX9975az 0.5 8.0 v MAX9975ar -2.5 +5.0 low-clamp input voltage range v cpl _ MAX9975az -2.0 +5.5 v at dut_ with i dut _ = 1ma, v cphv _ = 0v ?00 MAX9975ar at dut_ with i dut _ = -1ma, v cplv _ = 0v ?00 at dut_ with i dut _ = 1ma, v cphv _ = 0.5v ?00 clamp offset voltage v os MAX9975az at dut_ with i dut _ = -1ma, v cplv _ = 0v ?00 mv offset-voltage temperature coefficient ?50 ?/? i dut _ = 1ma, v cphv _ = 0v ?0 MAX9975ar i dut _ = -1ma, v cplv _ = 0v ?0 i d u t _ = 1m a, v c p h v _ = 0.5v ?0 clamp power-supply rejection ratio (note 11) psrr MAX9975az i dut _ = -1ma, v cplv _ = 0v ?0 mv/v voltage gain a v 0.96 1.005 v/v voltage-gain temperature coefficient -30 ppm/?
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load 10 ______________________________________________________________________________________ electrical characteristics (continued) (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, t j = +85?, unless otherwise noted. all temperature coeffi- cients are measured at t j = +60? to +100?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units i dut _ = 1ma, v cplv _ = -1.5v, v cphv _ = 0 to 6.5v ?0 MAX9975ar i dut _ = -1ma, v cphv _ = 6.5v, v cplv _ = -1.5v to +5.0v ?0 i dut _ = 1ma, v cplv _ = -1.0v, v cphv _ = 0.5v to 7.0v ?0 clamp linearity MAX9975az i dut _ = -1ma, v cphv _ = 7.0v, v cplv _ = -1.0v to +5.5v ?0 mv v cphv _ = 0v, v cplv _ = -1.5v, v dut _ = 6.5v 40 80 MAX9975ar v cphv _ = 6.5v, v cplv _ = 5.0v, v dut _ = -1.5v -80 -40 v cphv _ = 0.5v, v cplv _ = -1.0v, v dut _ = 7.0v 40 80 short-circuit output current i scdut _ MAX9975az v cphv _ = 7.0v, v cplv _ = 5.5v, v dut _ = -1.0v -80 -40 ma clamp dc impedance r out v cphv _ = 3v, v cplv _ = 0v, i dut _ = ?ma and ?5ma 48 53 v cphv_ = 2.5v, v cplv_ = -1.5v i dut_ = 10ma, 20ma, 30ma 1.5 MAX9975ar v cphv_ = 6.5v v cplv_ = 2.5v, i dut_ = -10ma, -20ma, -30ma 1.5 v cphv_ = 2.5v, v cplv_ = -1.0v i dut_ = 10ma, 20ma, 30ma 1.5 clamp dc impedance variation MAX9975az v cphv_ = 7.0v v cplv_ = 2.5v, i dut_ = -10ma, -20ma, -30ma 1.5
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load ______________________________________________________________________________________ 11 electrical characteristics (continued) (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, t j = +85?, unless otherwise noted. all temperature coeffi- cients are measured at t j = +60? to +100?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units active load (v com _ = 1.5v, r l > 1m , driver in high-impedance mode, unless otherwise noted) MAX9975ar -1.0 +6.0 com_ voltage range v com _ MAX9975az -0.5 +6.5 v differential voltage range v dut_ - v com_ -7.5 +7.5 v com_ offset voltage v os i source = i sink = 20ma ?00 mv offset-voltage temperature coefficient +100 ?/? com_ voltage gain a v v com _ = 0, 4.5v, i source = i sink = 20ma 0.98 1.00 v/v voltage-gain temperature coefficient -10 ppm/? MAX9975ar v com _ = -1v, +6v i source = i sink = 20ma ? ?5 com_ linearity error (note 10) MAX9975az v com _ = -0.5v, +6.5v i source = i sink = 20ma ? ?5 mv com_ output voltage power- supply rejection ratio psrr v com _ = 2.5v, i source = i sink = 20ma (note 11) ?0 mv/v i source = i sink = 35ma 30 MAX9975ar v dut _ = 3v, 6.5v with v com _ = -1v and v dut _ = -1.5v, +2v with v com _ = +6.0v i source = i sink = 1ma 500 i source = i sink = 35ma 30 output resistance, sink or source ro MAX9975az v dut _ = 3.5v, 7.0v with v com _ = -0.5v and v dut _ = -1.0v, +2.5v with v com _ = +6.5v i source = i sink = 1ma 500 k deadband v com _ = 2.5v, 95% i source to 95% i sink 700 1000 mv source current (v dut _ = 4.5v) maximum source current v ldl _ = 3.8v 36 40 ma source programming gain a tc v ldl _ = 0.2v, 3v, v ldh_ = 0.1v 9.75 10 10.25 ma/v source current offset (combined offset of ldl_ and gs) i os v ldl _ = 200mv -1000 0a source-current temperature coefficient i source = 35ma -15 ?/? i source = 25ma ?0 source-current power-supply rejection ratio psrr i source = 35ma ?4 ?/v v ldl _ = 100mv, 1v, 2.25v ?0 s our ce c ur r ent li near i ty ( n ote 25) v ldl _ = 3v ?30 ?
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load 12 ______________________________________________________________________________________ electrical characteristics (continued) (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, t j = +85?, unless otherwise noted. all temperature coeffi- cients are measured at t j = +60? to +100?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units sink current (v dut _ = -1.5v, MAX9975ar; v dut _ = -1.0v, MAX9975az) maximum sink current v ldh _ = 3.8v -40 -36 ma sink programming gain a tc v ldh _ = 0.2v, 3v, v ldl _ = 0.1v -10.25 -10 -9.75 ma/v sink current offset (combined offset of ldh_ and gs) i os v ldh _ = 200mv 0 1000 ? sink-current temperature coefficient i sink = 35ma +8 ?/? i sink = 25ma ?0 sink-current power-supply rejection ratio psrr i sink = 35ma ?4 ?/v v ldh _ = 100mv, 1v, 2.25v ?0 sink current linearity (note 25) v ldh _ = 3v ?30 ?/v ground sense gs voltage range v gs verified by gs common-mode error test -250 +250 mv v dut _ = -1.5v, v gs = ?50mv, v ldh _ - v gs = 0.2v ?0 MAX9975ar v dut _ = +4.5v, v gs = ?50mv, v ldl _ - v gs = 0.2v ?0 v dut _ = -1v, v gs = ?50mv, v ldh _ - v gs = 0.2v ?0 gs common-mode error MAX9975az v dut _ = +4.5v, v gs = ?50mv, v ldl _ - v gs = 0.2v ?0 ? gs input bias current v gs = 0v ?5 ? ac characteristics (z l = 50 to gnd) i source = 10ma, v com _ = -1v 2.7 3.5 4.3 enable time (note 26) t en i sink = 10ma, v com _ = 1v 2.7 3.5 4.3 ns i source = 10ma, v com _ = 1v 1.5 2 2.5 disable time (note 26) t dis i sink = 10ma, v com _ = -1v 1.5 2 2.5 ns to 10% 15 i source = i sink = 1ma to 1.5% 50 to 10% 3 5 current settling time on commutation (note 27) i source = i sink = 20ma to 1.5% 15 ns spike during enable/disable transition i source = i sink = 35ma, v com _ = 0v 200 300 mv
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load ______________________________________________________________________________________ 13 note 1: all minimum and maximum dc measurements and driver 3v rise- and fall-time test limits are 100% production tested. all other test limits are guaranteed by design. tests are performed at nominal supply voltages, unless otherwise noted. note 2: total for dual device at worst-case setting. note 3: does not include above ground internal dissipation of the comparator outputs. additional power dissipation is typically (64ma x v vcco_ ). note 4: externally forced voltages may exceed this range provided that the absolute maximum ratings are not exceeded. note 5: transition time from lleak being asserted to leakage current dropping below specified limits. note 6: based on simulation results only. note 7: transition time from lleak being deasserted to output returning to normal operating mode. note 8: with the exception of offset and gain/cmrr tests, reference input values are calibrated for offset and gain. note 9: relative to straight line between 0 and 4.5v. note 10: specifications measured at the endpoints of the full range. full range for the MAX9975ar is -1.3v v dhv_ +6.5v, -1.5v v dlv_ +6.3v, -1.5v v dtv_ +6.5v. full range for the MAX9975az is -0.8v v dhv_ +7v, -1v v dlv_ +6.8v, -1v v dtv_ +7v. note 11: change in offset voltage with power supplies independently set to their minimum and maximum values. note 12: nominal target value is 48 . contact factory for alternate trim selections within the 45 to 51 range. note 13: v dtv_ = midpoint of voltage swing, r s = 50 . measurement is made using the comparator. note 14: measured from the crossing point of data_ inputs to the settling of the driver output. note 15: prop delays are measured from the crossing point of the differential input signals to the 50% point of the expected output swing. rise time of the differential inputs data_ and rcv_ are 250ps (10% to 90%). note 16: rising edge to rising edge or falling edge to falling edge. note 17: specified amplitude is programmed. at this pulse width, the output reaches at least 90% of its nominal (dc) amplitude. the pulse width is measured at data_. note 18: specified amplitude is programmed. maximum data rate is specified in transitions per second. a square wave that reaches at least 90% of its programmed amplitude may be generated at one-half of this frequency. note 19: crosstalk from either driver to the other. aggressor channel is driving 3v p-p into a 50 load. victim channel is in term mode with v dtv_ = +1.5v. note 20: indicative of switching speed from dhv_ or dlv_ to dtv_ and dtv_ to dhv_ or dlv_ when v dlv_ < v dtv_ < v dhv_ . if v dtv_ < v dlv_ or v dtv_ > v dhv_ , switch- ing speed is degraded by a factor of approximately 3. note 21: change in offset voltage over the input range. note 22: unless otherwise noted, all propagation delays are measured at 40mhz, v dut_ = 0 to +1v, v chv_ = v clv_ = +0.5v, t r = t f = 250ps, z s = 50 , driver in term mode with v dtv_ = +0.5v. comparator outputs are terminated with 50 to 0.9v and v cco _ = 1.8v. measured from v dut_ crossing calibrated chv_/clv_ threshold to crossing point of differential outputs. note 23: at this pulse width, the output reaches at least 90% of its dc voltage swing. the pulse width is measured at the crossing points of the differential outputs. note 24: v dut_ = 200mv p-p . overdrive = 100mv. note 25: relative to segmented interpolations between 200mv, 2v, 2.5v, and 3.5v. note 26: measured from crossing of lden_ inputs to the 50% point of the output current change. note 27: v com = 1v, r s = 50 , driving voltage = 1.55v to 0.45v transition and 0.45v to 1.55v transition (at 1ma) or +2.5v to -0.5v transition and -0.5v to +2.5v transi- tion (at 20ma). settling time is measured from v dut _ = 1v to i sink /i source settling within specified tolerance. electrical characteristics (continued) (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, t j = +85?, unless otherwise noted. all temperature coeffi- cients are measured at t j = +60? to +100?, unless otherwise noted.) (note 1) dtv_ dhv_ t tdr dlv_ t tdf dhv_ t dtf dlv_ t dtr dtv_ (a) drive-to-term rise and fall time (b) term-to-drive rise and fall time 90% 10% 90% 10% 90% 10% 90% 10% figure 1. drive-to-term and term-to-drive rise and fall times
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load 14 ______________________________________________________________________________________ typical operating characteristics (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, r dut_ trimmed to 50 , t j = +85?, unless otherwise noted.) driver small-signal response MAX9975 toc01 v dut_ = 50mv/div t = 2.0ns/div v dlv_ = 0v r l = 50 v dhv_ = 500mv v dhv_ = 200mv v dhv_ = 100mv 0 driver large-signal response MAX9975 toc02 v dut_ = 500mv/div t = 2ns/div v dlv_ = 0v r l = 50 v dhv_ = 5v v dhv_ = 3v v dhv_ = 1v 0 driver 1v, 1800mbps signal response MAX9975 toc05 v dut_ = 100mv/div t = 200ps/div 0 v dlv_ = 0v, v dhv_ = 1v, r l = 50 driver 3v, 400mbps signal response MAX9975 toc06 v dut_ = 250mv/div t = 1ns/div v dlv_ = 0v v dhv_ = 3v r l = 50 0 driver 3v, 1200mbps signal response MAX9975 toc07 v dut_ = 250mv/div t = 250ps/div 0 v dlv_ = 0v v dhv_ = 3v r l = 50 driver dynamic current-limit response MAX9975 toc08 i dut_ = 40ma/div t = 50ns/div 0 driver sourcing driver sinking r l = 10 driver large-signal response into 500 MAX9975 toc03 v dut_ = 1v/div t = 2ns/div v dlv_ = 0v r l = 500 c l = 0.1pf v dhv_ = 5v v dhv_ = 3v v dhv_ = 1v 0 driver 1v, 600mbps signal response MAX9975 toc04 v dut_ = 100mv/div t = 500ps/div 0 v dlv_ = 0v, v dhv_ = 1v, r l = 50 driver 3v trailing-edge timing error vs. pulse width MAX9975 toc09 pulse width (ns) timing error (ps) 20 15 10 5 -80 -60 -40 -20 0 20 40 -100 025 positive pulse negative pulse normalized at pw = 12.5ns period = 25ns, v dhv_ = +3v, v dlv_ = 0v
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load ______________________________________________________________________________________ 15 typical operating characteristics (continued) (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, r dut_ trimmed to 50 , t j = +85?, unless otherwise noted.) driver 3v trailing-edge timing error vs. pulse width MAX9975 toc10 pulse width (ns) timing error (ps) 4.9 4.4 3.4 3.9 1.9 2.4 2.9 1.4 -50 -40 -30 -20 -10 0 10 20 30 -60 0.9 5.4 positive pulse negative pulse normalized at pw = 12.5ns, period = 25ns v dhv_ = +3v, v dlv_ = 0v driver 1v trailing-edge timing error vs. pulse width MAX9975 toc11 pulse width (ns) timing error (ps) 20 15 10 5 -20 -30 -10 0 10 20 30 -40 025 positive pulse negative pulse normalized at pw = 12.5ns period = 25ns, v dhv_ = +1v, v dlv_ = 0v driver 1v trailing-edge timing error vs. pulse width MAX9975 toc12 pulse width (ns) timing error (ps) 4.8 4.2 3.0 3.6 1.8 2.4 1.2 -35 -30 -25 -20 -15 -10 -5 0 5 10 -40 0.6 5.4 positive pulse negative pulse normalized at pw = 12.5ns, period = 25ns v dhv_ = +1v, v dlv_ = 0v driver time delay vs. common-mode voltage MAX9975 toc13 common-mode voltage (v) time delay (ps) 5 4 3 2 1 -10 0 10 20 30 40 50 -20 06 rising edge falling edge normalized at v cm = 1.5v MAX9975ar drive-to-term transition MAX9975 toc14 v dut_ = 250mv/div t = 2.0ns/div r l = 50 dhv_ to dtv_ dlv_ to dtv_ 0 drive to high-impedance transition MAX9975 toc15 v dut_ = 250mv/div t = 2ns/div r l = 50 dhv_ to high impedance dlv_ to high impedance 0 driver linearity error vs. output voltage MAX9975 toc16 v dut_ (v) linearity error (mv) 5.5 4.5 -0.5 0.5 1.5 2.5 3.5 -6 -4 -2 0 2 4 6 8 -8 -1.5 6.5 dut_ = dhv_ v dlv_ = -1.5v v dtv_ = 0v MAX9975ar driver linearity error vs. output voltage MAX9975 toc17 v dut_ (v) linearity error (mv) 5.5 4.5 -0.5 0.5 1.5 2.5 3.5 -6 -4 -2 0 2 4 6 8 -8 -1.5 6.5 dut_ = dlv_ v dhv_ = +6.5v v dtv_ = 0v MAX9975ar driver linearity error vs. output voltage MAX9975 toc18 v dut_ (v) linearity error (mv) 5.5 4.5 -0.5 0.5 1.5 2.5 3.5 -6 -4 -2 0 2 4 6 8 -8 -1.5 6.5 dut_ = dtv_ v dlv_ = -1.5v v dhv_ = +6.5v MAX9975ar
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load 16 ______________________________________________________________________________________ typical operating characteristics (continued) (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, r dut_ trimmed to 50 , t j = +85?, unless otherwise noted.) crosstalk to dut_ from dlv_ with dut_ = dhv_ MAX9975 toc19 v dlv_ (v) v dut_ error (mv) 5.5 4.5 -0.5 0.5 1.5 2.5 3.5 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0 -2.0 -1.5 6.5 v dhv_ = 5v v dtv_ = 1.5v MAX9975ar normalized at v dlv_ = 0v crosstalk to dut_ from dhv_ with dut_ = dlv_ MAX9975 toc20 v dhv_ (v) v dut_ error (mv) 5.5 4.5 -0.5 0.5 1.5 2.5 3.5 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0 -2.0 -1.5 6.5 v dlv_ = 0v v dtv_ = 1.5v MAX9975ar normalized at v dhv_ = 5v crosstalk to dut_ from dtv_ with dut_ = dhv_ MAX9975 toc21 v dtv_ (v) v dut_ error (mv) 5.5 4.5 -0.5 0.5 1.5 2.5 3.5 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0 -2.0 -1.5 6.5 v dhv_ = 3v v dlv_ = 0v MAX9975ar normalized at v dtv_ = 1.5v crosstalk to dut_ from dtv_ with dut_ = dlv_ MAX9975 toc22 v dtv_ (v) v dut_ error (mv) 5.5 4.5 -0.5 0.5 1.5 2.5 3.5 -1.5 -1.0 -0.5 0.5 0 1.0 1.5 2.0 -2.0 -1.5 6.5 v dhv_ = 6.5v v dlv_ = 0v MAX9975ar normalized at v dtv_ = 1.5v crosstalk to dut_ from dlv_ with dut_ = dtv_ MAX9975 toc23 v dlv_ (v) v dut_ error (mv) 5.5 4.5 -0.5 0.5 1.5 2.5 3.5 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1.0 -1.0 -1.5 6.5 v dhv_ = 6.5v v dtv_ = 1.5v MAX9975ar normalized at v dlv_ = 0v crosstalk to dut_ from dhv_ with dut_ = dtv_ MAX9975 toc24 v dhv_ (v) v dut_ error (mv) 5.5 4.5 -0.5 0.5 1.5 2.5 3.5 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1.0 -1.0 -1.5 6.5 v dlv_ = -1.5v v dtv_ = +1.5v MAX9975ar normalized at v dhv_ = 3v driver gain vs. temperature MAX9975 toc25 temperature ( c) gain (v/v) 95 90 85 80 75 70 65 0.9990 0.9995 1.0000 1.0005 1.0010 1.0015 0.9985 60 100 normalized at t j = +85 c driver offset vs. temperature MAX9975 toc26 temperature ( c) offset (mv) 95 90 85 80 75 70 65 0 -0.2 -0.4 -0.6 -0.8 0.2 0.4 0.6 0.8 1.0 -1.0 60 100 normalized at t j = +85 c driver output-voltage error vs. ground-sense voltage MAX9975 toc27 v gs (v) dut_ error (mv) 0.2 0.1 0 -0.1 -0.2 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 -2.0 -0.3 0.3 dut_ = dlv_ normalized at v gs = 0v dut_ = dhv_
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load ______________________________________________________________________________________ 17 typical operating characteristics (continued) (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, r dut_ trimmed to 50 , t j = +85?, unless otherwise noted.) comparator offset vs. common-mode voltage MAX9975 toc28 common-mode voltage (v) offset (mv) 5.5 4.5 -0.5 0.5 1.5 2.5 3.5 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0 -2.0 -1.5 6.5 normalized at v cm = 1.5v other comparator reference = 2.5v MAX9975ar comparator timing variation vs. common-mode voltage MAX9975 toc29 common-mode voltage (v) timing variation (ps) 5.5 4.5 -0.5 0.5 1.5 2.5 3.5 -5 0 5 10 15 20 25 30 -10 -1.5 6.5 normalized at v cm = 1.5v MAX9975ar falling edge rising edge comparator waveform tracking MAX9975 toc30 reference level (%) timing variation (ps) 80 60 20 40 -50 -40 -30 -20 -10 0 10 20 -60 0 100 normalized at 50% reference level v dut_ = 0 to 1v pulse rising edge falling edge comparator trailing-edge timing variation vs. pulse width MAX9975 toc31 pulse width (ns) timing variation (ps) 20 15 10 5 -30 -35 -40 -25 -20 -15 -10 -5 0 5 10 -45 025 normalized at pw = 12.5ns high pulse low pulse comparator trailing-edge timing variation vs. pulse width MAX9975 toc32 pulse width (ns) timing variation (ps) 4.4 3.4 1.4 2.4 -35 -30 -25 -20 -10 -15 -5 0 -40 0.4 5.4 high pulse low pulse normalized at pw = 12.5ns comparator with hysteresis trailing-edge timing variation vs. pulse width MAX9975 toc33 pulse width (ns) timing variation (ps) 20 15 10 5 -40 -30 -20 -10 0 10 -50 025 high pulse low pulse normalized at pw = 12.5ns r hys = 2.4k comparator timing variation vs. input slew rate MAX9975 toc34 slew rate (v/ns) timing variation (ps) 6 5 3 4 2 1 -20 -15 -10 -5 0 5 10 15 20 -25 07 v dut_ falling v dut_ rising normalized at sr = 4v/ns comparator differential output response MAX9975 toc35 v dut_ = 200mv/div t = 2ns/div 0 v dut_ = 0 to 3v pulse v chv_ = v clv_ = 1.5v external load = 50 comparator response to high slew-rate overdrive MAX9975 toc36 v dut_ = 200mv/div t = 2ns/div 0 input slew rate = 4v/ns driver in high-impedance mode
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load 18 ______________________________________________________________________________________ clamp response at source MAX9975 toc40 v dut_ = 200mv/div t = 10ns/div 0 v dut_ = 0 to 1v square wave r s = 10 v cplv_ = -0.1v, v cphv_ = +1.1v active-load commutation signal response MAX9975 toc41 i dut_ = 10ma/div t = 5ns/div 0 v ldh_ = 2v v ldl_ = 2v active-load enable signal response MAX9975 toc42 i dut_ = 10ma/div t = 5ns/div 0 v ldh_ = 2v v ldl_ = 2v i ldh_ i ldl_ comparator offset vs. temperature MAX9975 toc37 temperature ( c) offset (mv) 95 90 65 70 75 80 85 -0.4 -0.1 -0.2 -0.5 -0.3 0 0.1 0.2 0.3 0.4 0.5 60 100 normalized at t j = +85 c comparator hysteresis vs. r hys_ to gnd MAX9975 toc38 r hys_ (k ) hysteresis (mv) 5.5 5.0 4.5 4.0 3.5 3.0 2.5 3 5 7 9 11 13 15 1 2.0 6.0 comparator hysteresis vs. temperature MAX9975 toc39 temperature ( c) hysteresis (mv) 95 90 85 80 75 70 65 13.0 13.5 14.0 14.5 15.0 15.5 12.5 60 100 r hys_ = 2.4k active-load current vs. load voltage MAX9975 toc43 v dut_ (v) i dut_ (ma) 3.2 3.0 2.6 2.8 2.0 2.2 2.4 1.8 -40 -30 -20 -10 0 10 20 30 40 50 -50 1.6 3.4 v com_ = 2.5v v ldh_ = 3.5v v ldl_ = 3.5v active-load linearity i dut_ error vs. v ldh_ MAX9975 toc44 v ldh_ (v) linearity error ( a) 1 0.1 -40 -30 -20 -10 0 10 20 30 40 50 -50 0.01 10 calibration points at 200mv, 2.0v, 2.5v, and 3.5v v com_ = 1.5v, v ldl_ = 0v v dut_ = 0v active-load linearity i dut_ error vs. v ldl_ MAX9975 toc45 v ldl_ (v) linearity error ( a) 1 0.1 -40 -30 -20 -10 0 10 20 30 40 50 -50 0.01 10 calibration points at 200mv, 2.0v, 2.5v, and 3.5v v com_ = 1.5v, v ldh_ = 0v v dut_ = 3v typical operating characteristics (continued) (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, r dut_ trimmed to 50 , t j = +85?, unless otherwise noted.)
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load ______________________________________________________________________________________ 19 high-impedance current vs. dut_ voltage MAX9975 toc46 v dut_ (v) i dut_ ( a) 5.5 4.5 2.5 3.5 0.5 1.5 -0.5 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0.2 -1.5 6.5 MAX9975ar low-leakage current vs. dut_ voltage MAX9975 toc47 v dut_ (v) i dut_ (na) 5.5 4.5 2.5 3.5 0.5 1.5 -0.5 -8 -10 -6 -4 -2 0 2 4 -12 -1.5 6.5 MAX9975ar clamp current vs. difference voltage MAX9975 toc48 v cphv_ (v) i dut_ ( a) 3.9 3.8 3.6 3.7 3.2 3.3 3.4 3.5 3.1 0 100 200 300 400 500 600 700 800 900 1000 -100 3.0 4.0 v dut_ = 3v v cplv = 0v clamp current vs. difference voltage MAX9975 toc49 v cplv_ (v) i dut_ ( a) -0.1 -0.2 -0.4 -0.3 -0.8 -0.7 -0.6 -0.5 -0.9 -900 -800 -700 -600 -500 -400 -300 -200 -100 0 100 -1000 -1.0 0 v dut_ = 0v v cphv_ = 3v drive 1v to low-leakage transition MAX9975 toc50 t = 2 s/div i dut_ = 2.5 a/div 0 0 r l = 100k c l = 10pf typical operating characteristics (continued) (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, r dut_ trimmed to 50 , t j = +85?, unless otherwise noted.)
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load 20 ______________________________________________________________________________________ low-leakage to drive 1v transition MAX9975 toc51 t = 50ns/div i dut_ = 2.5 a/div 0 0 r l = 100k c l = 10pf driver reference current vs. driver reference voltage MAX9975 toc52 input voltage (v) input current ( a) 5.5 4.5 -0.5 0.5 1.5 2.5 3.5 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 0.80 -1.5 6.5 MAX9975ar dtv_ dhv_ and dlv_ comparator reference current vs. input voltage MAX9975 toc53 input voltage (v) input current (na) 5.5 4.5 -0.5 0.5 1.5 2.5 3.5 -450 -300 -350 -400 -250 -200 -100 -150 -50 0 -500 -1.5 6.5 chv_ clv_ MAX9975ar input current vs. input voltage, cphv_ MAX9975 toc54 v cphv_ (v) i cphv_ (na) 6.0 4.5 3.0 1.5 500 550 600 650 700 750 450 07.5 v cplv_ = -2.2v MAX9975ar input current vs. input voltage, cplv_ MAX9975 toc55 v cplv_ (v) i cplv_ (na) 3.5 2.0 0.5 -1.0 -1000 -950 -900 -850 -800 -750 -700 -1050 -2.5 5.0 v cphv_ = 7.2v MAX9975ar load-reference input current vs. input voltage MAX9975 toc56 input voltage (v) input current (na) 3.5 3.0 2.0 2.5 1.0 1.5 0.5 -800 -600 -400 -200 0 200 400 -1000 04.0 ldh_ ldl_ input current vs. input voltage, com_ MAX9975 toc57 v com_ (v) i com_ ( a) 5.0 0 1.0 2.0 3.0 4.0 1.000 0.975 1.050 1.025 1.075 1.100 1.125 1.150 1.175 1.200 0.950 -1.0 6.0 MAX9975ar typical operating characteristics (continued) (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, r dut_ trimmed to 50 , t j = +85?, unless otherwise noted.)
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load ______________________________________________________________________________________ 21 typical operating characteristics (continued) (MAX9975ar: v cc = +9.75v, v ee = -4.75v, v cphv_ = +7.2v, v cplv_ = -2.2v. MAX9975az: v cc = +10.25v, v ee = -4.25v, v cphv_ = +7.7v, v cplv_ = -1.7v. v cco_ = +1.8v, v ldh_ = v ldl_ = 0v, v gs = 0v, r hys_ = open, r dut_ trimmed to 50 , t j = +85?, unless otherwise noted.) supply current i ee vs. supply voltage v ee MAX9975 toc59 v ee (v) i ee (ma) -5.05 -4.95 -4.85 -4.75 -4.65 -4.55 -5.15 260 280 270 310 300 290 330 320 350 340 250 -5.25 a: v dut_ = v dtv_ = 1.5v, v dhv_ = 3v, v dlv_ = 0v, v chv_ = v clv_ = 0v, v cphv_ = 7.2v, v cplv_ = -2.2v, v ldh_ = v ldl_ = 0v, i sink = i source = 0 b: same as a except driver disabled high impedance and load enabled c: same as b except i source = i sink = 35ma, v com_ = -1v, r l = 0 d: same as c except low-leakage mode asserted c a d b r l = 10k c l = 0.5pf v cc = 9.75v MAX9975ar supply current i cc vs. temperature MAX9975 toc60 temperature ( c) i cc (ma) 90 95 80 85 70 75 163 164 165 166 167 162 60 65 100 v dut_ = v dtv_ = 1.5v, v dhv_ = 3v, v dlv_ = 0v, v chv_ = v clv_ = 0v, v cphv_ = 7.2v, v cplv_ = -2.2v, v ldh_ = v ldl_ = 0v, v cc = 9.75v, v ee = -4.75v MAX9975ar supply current i ee vs. temperature MAX9975 toc61 temperature ( c) i ee (ma) 90 95 80 85 70 75 65 280 281 282 283 284 279 60 100 v dut_ = v dtv_ = 1.5v, v dhv_ = 3v, v dlv_ = 0v, v chv_ = v clv_ = 0v, v cphv_ = 7.2v, v cplv_ = -2.2v, v ldh_ = v ldl_ = 0v, v cc = 9.75v, v ee = -4.75v MAX9975ar supply current i cc vs. supply voltage v cc MAX9975 toc58 v cc (v) i cc (ma) 10.3 10.1 9.9 9.7 160 180 200 220 240 140 9.5 10.5 a: v dut_ = v dtv_ = 1.5v, v dhv_ = 3v, v dlv_ = 0v, v chv_ = v clv_ = 0v, v cphv_ = 7.2v, v cplv_ = -2.2v, v ldh_ = v ldl_ = 0v, i sink = i source = 0 b: same as a except driver disabled high impedance and load enabled c: same as b except i source = i sink = 35ma, v com_ = 1.5v, r l = 0 d: same as c except low-leakage mode asserted a c b d r l = 10k c l = 0.5pf v ee = -4.75v MAX9975ar
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load 22 ______________________________________________________________________________________ pin description pin name function 1 temp temperature monitor output 2, 9, 12, 14, 17, 24, 35, 45, 46, 60, 80, 81, 91 v ee negative power-supply input 3, 5, 10, 16, 21, 23, 25, 34, 43, 44, 82, 83, 92 gnd ground connection 4, 11, 15, 22, 33, 41, 42, 66, 84, 85, 93 v cc positive power-supply input 6, 8, 18, 20, 54, 72 n.c. no connection. do not connect. 7 dut1 channel 1 dut input/output. combined i/o for driver, comparator, clamp, and load. 13 gs ground sense. gs is the ground reference for ldh_ and ldl_. 19 dut2 channel 2 dut input/output. combined i/o for driver, comparator, clamp, and load. 26 clv2 channel 2 low-comparator reference input 27 chv2 channel 2 high-comparator reference input 28 dlv2 channel 2 driver-low reference input 29 dtv2 channel 2 driver-termination reference input 30 dhv2 channel 2 driver-high reference input 31 cplv2 channel 2 low-clamp reference input 32 cphv2 channel 2 high-clamp reference input 36 nch2 37 ch2 channel 2 high-comparator output. differential output of channel 2 high comparator. 38 v cco2 channel 2 collector voltage input. voltage input for channel 2 comparator output termination resistors. provides pullup voltage and current for the output termination resistors. 39 ncl2 40 cl2 channel 2 low-comparator output. differential output of channel 2 low comparator. 47 com2 channel 2 active-load commutation-voltage reference input
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load ______________________________________________________________________________________ 23 pin description (continued) pin name function 48 ldl2 channel 2 active-load source-current reference input 49 ldh2 channel 2 active-load sink-current reference input 50 hys2 channel 2 hysteresis input for single-ended compare mode. see hys1 when in differential compare mode. nominal v hys2 = -1v. 51 tdata2 channel 2 data-termination voltage input. termination voltage input for the data2 and ndata2 differential inputs. 52 ndata2 53 data2 channel 2 multiplexer control inputs. differential controls data2 and ndata2 select driver 2? input from dhv2 or dlv2. drive data2 above ndata2 to select dhv2. drive ndata2 above data2 to select dlv2. 55 nrcv2 56 rcv2 channel 2 multiplexer control inputs. differential controls rcv2 and nrcv2 place channel 2 in receive mode. drive rcv2 above nrcv2 to place channel 2 into receive mode. drive nrcv2 above rcv2 to place channel 2 into drive mode. 57 tlden2 c hannel 2 load - e nab l e ter m i nati on v ol tag e inp ut. ter m i nati on vol tag e i np ut for the ld e n 2 and n ld e n 2 d i ffer enti al i np uts. 58 nlden2 59 lden2 channel 2 multiplexer control inputs. differential controls lden2 and nlden2 enable/disable the active load. drive lden2 above nlden2 to enable the channel 2 active load. drive nlden2 above lden2 to disable the channel 2 active load. 61 rst reset input. asynchronous reset input for the serial register. rst is active low. 62 cs chip-select input. serial port activation input. cs is active low. 63 thr single-ended logic threshold. leave thr unconnected to set the threshold to +1.25v or force thr to a desired threshold voltage. 64 sclk serial clock input. clock for serial port. 65 din data input. serial port data input. 67 lden1 68 nlden1 channel 1 multiplexer control inputs. differential controls lden1 and nlden1 enable/disable the active load. drive lden1 above nlden1 to enable the channel 1 active load. drive nlden1 above lden1 to disable the channel 1 active load. 69 tlden1 channel 1 load-enable termination voltage input. termination voltage input for the lden1 and nlden1 differential inputs.
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load 24 ______________________________________________________________________________________ pin description (continued) pin name function 70 rcv1 71 nrcv1 channel 1 multiplexer control inputs. differential controls rcv1 and nrcv1 place channel 1 in receive mode. drive rcv1 above nrcv1 to place channel 1 into receive mode. drive nrcv1 above rcv1 to place channel 1 into drive mode. 73 data1 74 ndata1 channel 1 multiplexer control inputs. differential controls data1 and ndata1 select driver 1? input from dhv1 or dlv1. drive data1 above ndata1 to select dhv1. drive ndata1 above data1 to select dlv1. 75 tdata1 channel 1 data-termination voltage input. termination voltage input for the data1 and ndata1 differential inputs. 76 hys1 channel 1 hysteresis input for single-ended compare mode. channel 1 and channel 2 hysteresis input for differential compare mode. nominal v hys1 = -1v. 77 ldh1 channel 1 active-load sink-current reference input 78 ldl1 channel 1 active-load source-current reference input 79 com1 channel 1 active-load commutation-voltage reference input 86 cl1 87 ncl1 channel 1 low-comparator output. differential output of channel 1 low comparator. 88 v cco1 channel 1 collector voltage input. voltage input for channel 1 comparator output termination resistors. provides pullup voltage and current for the output termination resistors. 89 ch1 90 nch1 channel 1 high-comparator output. differential output of channel 1 high comparator. 94 cphv1 channel 1 high-clamp reference input 95 cplv1 channel 1 low-clamp reference input 96 dhv1 channel 1 driver-high reference input 97 dtv1 channel 1 driver-termination reference input 98 dlv1 channel 1 driver-low reference input 99 chv1 channel 1 high-comparator reference input 100 clv1 channel 1 low-comparator reference input
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load ______________________________________________________________________________________ 25 buffer 50 dtv_ dhv_ dlv_ data_ ndata_ rcv_ nrcv_ cphv_ cplv_ chv_ ch_ nch_ cl_ ncl_ clv_ comparators clamps dut_ sclk cs v cc v ee gnd tmsel v cco_ din serial interface serial interface is common to both channels. mode bits independently latched for each channel. 0 0 1 0 1 1 1 tmsel r data 2 x 50 r cco 4 x 50 r lden 2 x 50 lleak lddis high impedance multiplexer thr tdata_ lleak temp v cc v ee active- load control ldh_ tlden_ lden_ nlden_ com_ ldl_ active load gs one of two identical channels shown. source (low) current sink (high) current ch_ mode bits lleak lddis cdiff cdiff from dut_ other channel rst MAX9975 hys_ functional diagram
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load 26 ______________________________________________________________________________________ detailed description the MAX9975 dual, low-power, high-speed, pin-electron- ics dcl ic includes, for each channel, a three-level pin driver, a dual comparator, variable clamps, and an active load. an additional differential comparator allows comparisons between the two channels. the driver fea- tures a -1.5v to +6.5v (MAX9975ar) or a -1.0v to +7.0v (MAX9975az) operating range and high-speed opera- tion, includes high-impedance and active-termination (3rd-level drive) modes, and is highly linear even at low voltage swings. the dual comparator provides low dis- persion (timing variation) over a wide variety of input con- ditions, and differential outputs. the clamps provide damping of high-speed dut waveforms when the device is configured as a high-impedance receiver. the pro- grammable load supplies up to 35ma of source and sink current. the load facilitates contact/continuity testing, at- speed parametric test of i oh and i ol , and pullup of high- output-impedance devices. internal resistors at the high-speed inputs provide com- patibility with cml interfaces. in addition, flexible open- collector outputs with optional internal pullup resistors are available for the comparators. these features sig- nificantly reduce the discrete component count on the circuit board. a 3-wire, low-voltage cmos-compatible serial interface programs the low-leakage, load-disable, slew-rate, dif- ferential/window comparator and tri-state/terminate operational configurations of the MAX9975. MAX9975 and max9969 compatibility the MAX9975 is pin compatible and functionally similar to the max9969. the MAX9975 differs from the max9969 in the following ways. the MAX9975 has lower dhv_, dlv_, and dtv_ gain errors. the MAX9975 has no programmable slew-rate control; the slew rate control bits are ignored. the MAX9975 features programmable hysteresis. the MAX9975 features double the comparator out- put current. the MAX9975az features a -1v to +7v operating range. output driver the driver input is a high-speed multiplexer that selects one of three voltage inputs: dhv_, dlv_, or dtv_. this switching is controlled by high-speed inputs data_ and rcv_ and mode-control bit tmsel (table 1). dut_ can be toggled at high speed between the buffer output and high-impedance mode, or it can be placed into low-leakage mode (figure 2, table 1). in high- impedance mode, the clamps are connected. high- speed input rcv_ and mode-control bits tmsel and MAX9975 dlv_ dhv_ dtv_ data_ rcv_ mode buffer 50 dut_ 2 cphv_ cplv_ 0 0 0 0 1 1 1 high-speed inputs reference inputs comparators and active load clamps tmsel lleak high impedance figure 2. simplified driver channel
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load ______________________________________________________________________________________ 27 lleak control the switching. in high-impedance mode, the bias current at dut_ is less than 3? over the 0 to 3v range, while the node maintains its ability to track high-speed signals. in low-leakage mode, the bias cur- rent at dut_ is further reduced to less than 15na, and signal tracking slows. see the low-leakage mode, lleak section for more details. the nominal driver output resistance can be trimmed to different values. contact the factory for different resis- tance values within the 45 to 51 range. clamps configure the voltage clamps (high, cphv_ and low, cplv_) to limit the voltage at dut_ and to suppress reflections when the channel is configured as a high- impedance receiver. the clamps behave as diodes connected to the outputs of high-current buffers. internal circuitry compensates for the diode drop at 1ma clamp current. set the clamp voltages using the external connections cphv_ and cplv_. the clamps are enabled only when the driver is in high-impedance mode (figure 2). for transient suppression, set the clamp voltages to approximately the minimum and maximum expected dut_ voltage range. the optimal clamp voltages are application specific and must be empirically determined. if clamping is not desired, set the clamp voltages at least 0.7v outside the expected dut_ voltage range; overvoltage protection remains active without loading dut_. comparators the MAX9975 provides two independent high-speed comparators for each channel. each comparator has one input connected internally to dut_ and the other input connected to either chv_ or clv_ (see the functional diagram ). comparator outputs are a logical result of the input conditions, as indicated in tables 2 and 3. the comparator differential outputs are open-collector outputs to ease interfacing with a wide variety of logic families. internal termination resistors switch a 16ma current source between the two outputs (figure 3). the termination resistors connect the outputs to voltage input v cco _. connect v cco _ to the desired v oh voltage. each output provides a nominal 800mv p-p swing and 50 source termination. if an additional external 50 destination termination is used to double-terminate the line, the nominal 800mv swing will be halved. the upper comparators are configurable as differential receivers for lvds and other differential dut_ signals. when mode bit cdiff is asserted, the upper compara- tor inputs are routed from the dut_ outputs for both channels. hysteresis the comparator function incorporates hysteresis control. hysteresis rejects noise and prevents oscillations on low-slew input signals. external resistors control hystere- sis levels. hys1 controls channel 1 and hys2 controls channel 2, when the MAX9975 is programmed in single- ended compare mode (cdiff = 0). hys1 also controls channel 2? high-comparator output when the MAX9975 is programmed in differential compare mode (cdiff = 1). with hys_ unconnected, the programmed hysteresis is 0mv. connect an external resistor between hys_ and gnd to program nonzero hysteresis. see the typical operating characteristics for typical resistance values. table 1. driver logic external connections internal control register data rcv tmsel lleak driver output 1 0 x 0 drive to dhv_ 0 0 x 0 drive to dlv_ x110 drive to dtv_ (term mode) x100 high-impedance mode (high-z) x x x 1 low-leakage mode table 2. comparator logic, cdiff = 0 (single-ended compare mode) sc1 sc0 driver slew rate (%) 0 0 100 01 75 10 50 11 25 table 3. comparator logic, cdiff = 1 (differential compare mode) dut1 > dut2 dut_ > clv_ cl_ ch_ 0000 0110 1001 1111
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load 28 ______________________________________________________________________________________ active load the active load consists of linearly programmable, class ab source and sink current sources, a commuta- tion buffer, and a diode bridge (see the functional diagram ). analog control inputs ldh_ and ldl_ pro- gram the sink and source currents, respectively, within the 0 to 35ma range. analog reference input com_ sets the commutation buffer output voltage. the source and sink naming convention is referenced to the dut. current out of the MAX9975 constitutes sink current and current into the MAX9975 constitutes source cur- rent. the class ab loads of the MAX9975 offer sub- stantial efficiency improvement over conventional active-load circuitry. the programmed source (low) current loads the dut when v dut _ > v com _. the programmed sink (high) current loads the dut when v dut _ < v com _. high-speed differential input lden_ and 2 bits of the control word (lddis and lleak) control the load (table 4). when the load is enabled, the internal source and sink current sources connect to the diode bridge. when the load is disabled, the internal current sources shunt to ground and the top and bottom of the bridge float (see the functional diagram ). lleak places the load in low-leakage mode, and overrides lden_. see the low-leakage mode, lleak section for more detailed information. lddis in some tester configurations, the load enable is driven with the complement of the driver high-impedance sig- nal (rcv_), so disabling the driver enables the load and vice versa. the lddis signal allows the load to be disabled independent of the state of lden_ (table 4). gs input gs is the ground-sense input. a level-setting dac, such as the max5631 or max5734, programs the MAX9975? active load, driver, comparator, and clamps. although all the dac levels are typically offset by v gs , the opera- tion of the MAX9975? ground-sense input nullifies this offset with respect to the active-load current. connect gs to the same ground reference used by the dac. (v ldl _ - v gs ) sets the source current by +10ma/v. (v ldh _ - v gs ) sets the sink current by -10ma/v. to maintain an 8v range in the presence of gs variations, gs offsets dhv_, dlv_, dtv_, cphv_, cplv_, and com_ ranges. adequate supply headroom must be maintained in the presence of gs variations. ensure: v cc 9.5v + max(v gs ) (MAX9975ar) v cc 10.0v + max(v gs ) (MAX9975az) v ee -4.5v + min(v gs ) (MAX9975ar) v ee -4.0v + min(v gs ) (MAX9975az) low-leakage mode, lleak asserting lleak through the serial port or with rst places the MAX9975 into a very low-leakage state (see the electrical characteristics table). with lleak assert- ed, the comparators function at a reduced speed, and MAX9975 clv_ chv_ dut_ ch_ nch_ 16ma 1 0 cl_ ncl_ v cco_ 4 x 50 v ee 16ma 1 1 from dut_ other channel cdiff figure 3. open-collector comparator outputs table 4. active-load programming external connections internal control register lden_ lddis lleak mode 000 normal operating mode, load disabled 100 normal operating mode, load enabled x 1 0 load disabled x x 1 low-leakage mode
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load ______________________________________________________________________________________ 29 the driver, clamps, and active load are disabled. this mode is convenient for making iddq and pmu measure- ments without the need for an output disconnect relay. lleak is programmed independently for each channel. when dut_ is driven with a high-speed signal while lleak is asserted, the leakage current momentarily increases beyond the limits specified for normal opera- tion. the low-leakage recovery specification in the electrical characteristics table indicates device behav- ior under this condition. serial interface and device control a cmos-compatible serial interface controls the MAX9975 modes (figure 4 and table 5). control data flow into an 8-bit shift register (msb first) and are latched when cs is taken high, as shown in figure 5. latches contain 6 control bits for each channel of the dual-pin driver. data from the shift register are loaded to either or both of the latches as determined by bits d6 and d7. when cdiff = 1, its effect is independent of bits d6 and d7. the control bits, in conjunction with external inputs data_ and rcv_, manage the features of each channel, as shown in tables 1 and 2. rst sets lleak = 1 for both channels, forcing them into low- leakage mode. all other bits are unaffected. at power- up, hold rst low until v cc and v ee have stabilized. sclk din rst 0 7 shift register lddis, tmsel, cdiff channel 1 mode bits *used for slew-rate control on max9969. 3 lleak lddis, tmsel, cdiff lleak 20k v thrint = 1.25v thr 123456 f/f d q enable 5 set f/f dq enable 5 set f/f dq enable 0, 1, 4 f/f d q enable 0, 1, 4 1 3 1 6 6 7 7 cs channel 2 mode bits enable MAX9975 lddis cdiff unused* unused* tmsel lleak ch2 ch1 figure 4. serial interface sclk din d6 d5 d4 d3 d2 d1 d0 t cl t css0 t css1 t csh1 t dh t ds t ch t cswh cs figure 5. serial-interface timing
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load 30 ______________________________________________________________________________________ analog control input thr sets the threshold for the input logic, allowing operation with cmos logic as low as 0.9v. leaving thr unconnected results in a nominal threshold of 1.25v from an internal reference, providing compatibility with 2.5v to 3.3v logic. temperature monitor the MAX9975 supplies a temperature output signal, temp, that asserts a 3.33v nominal output voltage at a +70? (343k) die temperature. the output voltage changes proportionally with temperature at 10mv/?. heat removal under normal circumstances, the MAX9975 requires heat removal through the exposed pad by use of an external heat sink. the exposed pad is electrically at v ee potential, and must be either connected to v ee or isolated. power dissipation is highly dependent upon the appli- cation. the electrical characteristics table indicates power dissipation under the condition that the source and sink currents are programmed to 0ma. maximum dissipation occurs when the source and sink currents are both at 35ma, the v dut _ is at an extreme of the voltage range, and the diode bridge is fully commutat- ed. under these conditions, the additional power dissi- pated (per channel) is: if dut_ is sourcing current: p d = (v dut_ - v ee ) x i source if dut_ is sinking current: p d = (v cc - v dut_ ) x i sink dut_ sources the programmed (low) current when v dut_ > v com_ . the path of the current is from dut_ through the outside of the diode bridge and the source (low) current source to v ee . the programmed sink cur- rent is greatly reduced by the class ab load architecture. dut_ sinks the programmed (high) current when v dut_ < v com_ . the path of the current is from v cc through the sink (high) current source and the outside of the diode bridge to dut_. the programmed source current is greatly reduced by the class ab architecture. jc of the exposed-pad package is very low, approxi- mately 1?/w to 2?/w. die temperature is thus highly dependent upon the heat removal techniques used in the application. maximum total power dissipation occurs under conditions shown in table 6. table 5. shift register functions bit name description d7 ch1 channel 1 write enable. set to 1 to update the control byte for channel 1. set to 0 to make no changes to channel 1. d6 ch2 channel 2 write enable. set to 1 to update the control byte for channel 2. set to 0 to make no changes to channel 2. d5 lleak low-leakage select. set to 1 to put driver, load, and clamps in low-leakage mode. comparators remain active in low-leakage mode, but at reduced speed. set to 0 for normal operation. d4 tmsel termination select. driver termination select bit. set to 1 to force the driver output to the dtv_ voltage when rcv_ = 1 (term mode). set to 0 to place the driver into high-impedance mode when rcv_ = 1 (high-z). see table 1. d3 sc1 d2 sc0 driver slew rate select. sc1 and sc0 set the driver slew rate. see table 2. d1 cdiff differential comparator enable. set to 1 to enable the differential comparators and disable the ch_ window comparators. set to 0 to enable the ch_ window comparators and disable the differential comparators. see tables 3a and 3b. d0 lddis load d i sab l e. s et ld d is to 1 to d i sab l e the table 6. maximum power dissipation conditions parameter MAX9975ar MAX9975az v cc +10.5v +11v v ee -5.25v -4.75v i source = i sink 35ma 35ma load both channels enabled both channels enabled v dut_ -1.5v -1v v com_ +0.5v +0.5v
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load ______________________________________________________________________________________ 31 under these extreme conditions, the total power dissi- pation is 4.3w typical and 4.8w maximum. if the die temperature cannot be maintained at an acceptable level under these conditions, use software clamping to limit the load output currents to lower values and/or reduce the supply voltages. power-supply considerations bypass all v cc and v ee power input pins with 0.01? capacitors, and use bulk bypassing of at least 10? on each supply. selector guide high-speed digital input termination ( ) part accuracy grade comparator output termination rcv_ data_ lden_ heat extraction max9969adccq a none none none none top max9969agccq a none 100 100 100 top 1 temp top view 2 v ee 3 gnd 4 v cc 5 gnd 6 n.c. 7 dut1 8 n.c. 9 v ee 10 gnd 11 v cc 12 v ee 13 gs 14 v ee 15 v cc 16 gnd 17 v ee 18 n.c. 19 dut2 20 n.c. 21 gnd 22 v cc 23 gnd 24 v ee 25 gnd 75 tdata1 74 ndata1 73 data1 72 n.c. 71 nrcv1 70 rcv1 69 tlden1 68 nlden1 67 lden1 66 v cc 65 din 64 sclk 63 thr 62 61 60 v ee 59 lden2 58 nlden2 57 tlden2 56 rcv2 55 nrcv2 54 n.c. 53 data2 52 ndata2 51 tdata2 26 clv2 27 chv2 28 dlv2 29 dtv2 30 dhv2 31 cplv2 32 cphv2 33 v cc 34 gnd 35 v ee 36 nch2 37 ch2 38 v cco2 39 ncl2 40 cl2 41 v cc 42 v cc 43 gnd 44 gnd 45 v ee 46 v ee 47 com2 48 ldl2 49 ldh2 50 hys2 100 clv1 99 chv1 98 dlv1 97 dtv1 96 dhv1 95 cplv1 94 cphv1 93 v cc 92 gnd 91 v ee 90 nch1 89 ch1 88 v cco1 87 ncl1 86 cl1 85 v cc 84 v cc 83 gnd 82 gnd 81 v ee 80 v ee 79 com1 78 ldl1 77 ldh1 76 hys1 rst cs MAX9975 pin configuration
MAX9975 dual, low-power, 1200mbps ate driver/comparator with 35ma load maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 32 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 32 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 32 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. package information for the latest package outline information, go to www.maxim-ic.com/packages

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