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general description the max6921/max6931 are 20-output, 76v, vacuum-fluorescent display (vfd) tube drivers that interface a multiplexed vfd tube to a vfd controller, such as the max6850?ax6853, or to a microcontroller. the max6921/max6931 are also ideal for driving static vfd tubes or telecom relays. data is input using an industry standard 4-wire serial interface (clock, data, load, blank), compatibile with either maxim? or industry-standard vfd driver and controller. for easy display control, the active-high blank input forces all driver outputs low, turning the display off, and automatically puts the max6921/max6931 into shut- down mode. display intensity can also be controlled by directly pulse-width modulating the blank input. the max6921 has a serial interface data output, dout, allowing any number of devices to be cascaded on the same serial interface. the max6931 has a negative supply voltage input, v ss , allowing the drivers?output swing to be made bipolar tosimplify filament biasing in many applications. the max6921 is available in 28-pin tssop, so, and plcc packages. the max6931 is available in a 28-pin tssop package. maxim also offers 12-output vfd drivers (max6920) and 32-output vfd drivers (max6922/max6932). applications white goods industrial weighing gaming machines security automotive telecom avionics vfd modules instrumentation industrial control features ? 5mhz industry-standard 4-wire serial interface ? 3v to 5.5v logic supply range ? 8v to 76v grid/anode supply range ? -11v to 0v filament bias supply (max6931 only) ? push-pull cmos high-voltage outputs ? outputs can source 40ma, sink 4ma continuously ? outputs can source 75ma repetitive pulses ? outputs can be paralleled for higher current drive ? any output can be used as a grid or an anode driver ? blank input simplifies pwm intensity control ? small 28-pin tssop package ? -40c to +125c temperature range max6921/max6931 20-output, 76v, serial-interfaced vfd tube drivers ___________________________________________________ _____________ maxim integrated products 1 ordering information 19-3020; rev 1; 4/10 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. part temp range pin-package max6921 aui+ -40 c to +125 c 28 tssop max6921awi/v+ -40 c to +125 c 28 wide so max6921aqi+ -40 c to +125 c 28 plcc max6931 aui+ -40 c to +125 c 28 tssop max6931 dinclk load blank vfdout vfclk vfload vfblank vfd tube 92 1 gnd -7v 6 22 c 2320 c1 100nf c3 100nf +5v 7 v cc v ss c2100nf +60v 8 v bb out0?ut19 20 typical operating circuit pin configurations appear at end of data sheet. + denotes a lead-free(pb)/rohs-compliant package. /v denotes an automotive qualified part. downloaded from: http:///
max6921/max6931 20-output, 76v, serial-interfaced vfd tube drivers 2 __________________________________________________ _____________________________________ absolute maximum ratings electrical characteristics ( typical operating circuit , v bb = 8v to 76v, v cc = 3v to 5.5v, v ss = -11v to 0v, v bb - v ss 76v, t a = t min to t max , unless other- wise noted.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. voltage (with respect to gnd)v bb .........................................................................-0.3v to +80v v cc ...........................................................................-0.3v to +6v v ss (max6931 only) ...............................................-12v to +0.3v v bb - v ss (max6931 only) .....................................-0.3v to +80v out_ (max6921 only) ..................(gnd - -0.3v) to (v bb + 0.3v) out_ (max6931 only) ....................(v ss - -0.3v) to (v bb + 0.3v) all other pins..............................................-0.3v to (v cc + 0.3v) out_ continuous source current ....................................-45ma out_ pulsed (1ms max, 1/4 max duty) source current ...-80ma total out_ continuous source current .........................-540ma total out_ continuous sink current .................................90ma total out_ pulsed (1ms max, 1/4 max duty) source current ...........................................................-960ma out_ sink current .............................................................15ma clk, din, load, blank, dout current .......................?0ma continuous power dissipation (t a = +70?) 28-pin tssop (derate 12.8mw/? over +70?)................................................................1025mw 28-pin wide so (derate 12.5mw/? over +70?)................................................................1000mw 28-pin plcc (derate 10.5mw/? over +70?)..................................................................842mw operating temperature range (t min to t max ) ...............................................-40? to +125? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? soldering temperature (reflow) wide so, tssop lead(pb)-free ...................................+260? plcc lead(pb)-free......................................................+245? parameter symbol conditions min typ max units logic supply voltage v cc 3 5.5 v tube supply voltage v bb 87 6 v bias supply voltage(max6931 only) v ss -11 0 v total supply voltage(max6931 only) v bb - v ss 76 v t a = +25? 78 170 all outputs out_ low,clk = idle t a = -40? to +125? 200 t a = +25? 540 900 logic supply operating current i cc all outputs out_ high,clk = idle t a = -40? to +125? 1000 ? t a = +25? 1.65 3.0 all outputs out_ low t a = -40? to +125? 6.9 t a = +25? 0.85 1.3 tube supply operating current i bb all outputs out_ high t a = -40? to +125? 1.4 ma t a = +25? -0.8 -0.38 all outputs out_ low t a = -40? to +125? -1.9 t a = +25? -1.4 -0.87 bias supply operating current(max6931 only) i ss all outputs out_ high t a = -40? to +125? -1.5 ma downloaded from: http:///
max6921/max6931 20-output, 76v, serial-interfaced vfd tube drivers ___________________________________________________ ____________________________________ 3 electrical characteristics (continued) ( typical operating circuit , v bb = 8v to 76v, v cc = 3v to 5.5v, v ss = -11v to 0v, v bb - v ss 76v, t a = t min to t max , unless other- wise noted.) (note 1) parameter symbol conditions min typ max units t a = +25? v bb - 2 t a = -40? to +85? v bb - 2.5 v bb 15v i out = -25ma t a = -40? to +125? t a = -40? to +85? v bb - 3.5 v bb 15v i out = -40ma t a = -40? to +125? v bb - 4.0 t a = +25? v bb - 1.2 t a = -40? to +85? v bb - 2.5 high-voltage out_ 8v < v bb < 15v i out = -25ma t a = -40? to +125? v bb - 3.0 v t a = +25? 0.75 1 t a = -40? to +85? 1.5 v bb 15v i out = 1ma t a = -40? to +125? 1.9 t a = +25? 0.8 1.1 t a = -40? to +85? 1.6 low-voltage out_(max6921 only) v l 8v < v bb < 15v i out = 1ma t a = -40? to +125? 2.0 v t a = +25? v ss + 0.75 v ss + 1 t a = -40? to +85? v ss + 1.5 v bb 15v i out = 1ma t a = -40? to +125? v ss + 1.9 t a = +25? v ss + 0.8 v ss + 1.1 t a = -40? to +85? v ss + 1.6 low-voltage out_(max6931 only) v l 8v < v bb < 15v i out = 1ma t a = -40? to +125? v ss + 2.0 v rise time out_ (20% to 80%) t r v bb = 60v, c l = 50pf, r l =2.3k 0.9 2 ? fall time out_ (80% to 20%) t f v bb = 60v, c l = 50pf, r l =2.3k 0.6 1.5 ? serial interface timing characteristics load rising to out_ falling delay (notes 2, 3) 0.9 1.8 ? load rising to out_ rising delay (notes 2, 3) 1.2 2.4 ? blank rising to out_ falling delay (notes 2, 3) 0.9 1.8 ? blank falling to out_ rising delay (notes 2, 3) 0.5 1.3 2.5 ? input leakage currentclk, din, load, blank i ih , i il 0.05 10 ? logic-high input voltageclk, din, load, blank v ih 0.8 x v cc v logic-low input voltageclk, din, load, blank v il 0.3 x v cc v hysteresis voltagedin, clk, load, blank ? v i 0.6 v high-voltage dout v oh i source = -1.0ma v cc - 0.5 v low-voltage dout v ol i sink = 1.0ma 0.5 v downloaded from: http:///
typical operating characteristics (v cc = 5.0v, v bb = 76v, and t a = +25?, unless otherwise noted.) max6921/max6931 20-output, 76v, serial-interfaced vfd tube drivers 4 __________________________________________________ _____________________________________ electrical characteristics (continued) ( typical operating circuit , v bb = 8v to 76v, v cc = 3v to 5.5v, v ss = -11v to 0v, v bb - v ss 76v, t a = t min to t max , unless other- wise noted.) (note 1) parameter symbol conditions min typ max units 3v to 4.5v 60 100 rise and fall time dout c dout = 10pf (note 2) 4.5v to 5.5v 30 80 ns clk clock period t cp 200 ns clk pulse-width high t ch 90 ns clk pulse-width low t cl 90 ns clk rise to load rise hold t csh (note 2) 100 ns din setup time t ds 5n s 3.0v to 4.5v 20 din hold time t dh 4.5v to 5.5v 15 ns 3.0v to 4.5v 25 120 240 dout propagation delay t do c dout = 10pf 4.5v to 5.5v 20 75 150 ns load pulse high t csw 55 ns note 1: all parameters are tested at t a = +25?. specifications over temperature are guaranteed by design. note 2: guaranteed by design. note 3: delay measured from control edge to when output out_ changes by 1v. tube supply current (i bb ) vs. temperature (outputs low) max6921/31 toc01 temperature ( c) supply current (ma) 100 80 40 60 020 -20 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 -40 120 v bb = 76v v bb = 40v v bb = 8v tube supply current (i bb ) vs. temperature (outputs high) max6921/31 toc02 temperature ( c) supply current (ma) 100 80 40 60 020 -20 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 -40 120 v bb = 76v v bb = 40v v bb = 8v logic supply current (i cc ) vs. temperature (outputs low) max6921/31 toc03 temperature ( c) supply current ( a) 100 80 40 60 020 -20 50 100 150 200 250 300 350 400 0 -40 120 v cc = 5v, clk = 5mhz v cc = 3.3v, clk = 5mhz v cc = 5v, clk = idle v cc = 3.3v, clk = idle downloaded from: http:///
max6921/max6931 20-output, 76v, serial-interfaced vfd tube drivers _______________________________________________________________________________________ 5 output rise and fall waveform max6921/31 toc07 1 s/div blank2v/div out_ 20v/div typical operating characteristics (continued) (v cc = 5.0v, v bb = 76v, and t a = +25?, unless otherwise noted.) logic supply current (i cc ) vs. temperature (outputs high) max6921/31 toc04 temperature ( c) supply current ( a) 100 80 40 60 020 -20 450 500 550 600 650 700 750 800400 -40 120 v cc = 5v, clk = 5mhz v cc = 3.3v, clk = 5mhz v cc = 5v, clk = idle v cc = 3.3v, clk = idle output voltage (v bb - v h ) vs. temperature (output high) max6921/31 toc05 temperature ( c) output voltage (v) 100 80 40 60 020 -20 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0 -40 120 v bb = 76v v bb = 40v v bb = 8v i out = -40ma output voltage vs. temperature (output low) max6921/31 toc06 temperature ( c) output voltage (v) 100 80 40 60 020 -20 2 4 6 8 10 12 14 0 -40 120 v bb = 40v v bb = 8v v bb = 76v i out = 4ma pin tssop wide so/plcc max6921 max6931 max6921 name function 1? 1? out4 to out0 vfd anode and grid drivers. out4 to out0 are push-pull outputs swinging fromv bb to gnd (max6921 only), and from v bb to v ss (max6931 only). 6 6 27 din serial-data input. data is loaded into the internal shift register on clk? rising edge. 7 7 28 v cc logic supply voltage. bypass to gnd with 100nf capacitor. 881v bb vfd tube supply voltage. bypass to gnd with 100nf capacitor. 9 2d o u t serial-clock output. data is clocked out of the internal shift register to dout onclk? rising edge. pin description downloaded from: http:///
max6921/max6931 20-output, 76v, serial-interfaced vfd tube drivers 6 __________________________________________________ _____________________________________ pin tssop wide so/plcc max6921 max6931 max6921 name function ?v ss filament bias supply voltage. bypass to gnd with a 100nf capacitor. 10?9 10?9 out19 to out10 vfd anode and grid drivers. out19 to out10 are push-pull outputs swinging fromv bb to gnd (max6921 only), and from v bb to v ss (max6931 only). 3-12 out19 to out10 vfd anode and grid drivers. out19 to out10 are push-pull outputs swinging fromv bb to gnd. 20 20 13 blank blanking input. high forces outputs out0 to out19 low, without altering thecontents of the output latches. low enables outputs out0 to out19 to follow the state of the output latches. 21 21 14 gnd ground 22 22 15 clk s er i al - c l ock inp ut. d ata i s l oad ed i nto the i nter nal shi ft r eg i ster on c lk s r i si ng ed g e. 23 23 16 load load input. data is loaded transparently from the internal shift register to the outputlatch while load is high. data is latched into the output latch on load? rising edge, and retained while load is low. 24?8 24?8 out9 to out5 vfd anode and grid drivers. out9 to out5 are push-pull outputs swinging fromv bb to gnd (max6921 only), and from v bb to v ss (max6931 only). 17-26 out9 to out0 vfd anode and grid drivers. out9 to out0 are push-pull outputs swinging fromv bb to gnd. pin description (continued) serial-to-parallel shift register latches clk din load blank out0 out1 out2 out19 dout max6921 only max6921max6931 figure 1. max6921/max6931 functional diagram downloaded from: http:///
detailed description the max6921/max6931 are vfd tube drivers compris-ing a 4-wire serial interface driving 20 high-voltage rail- to-rail output ports. the driver is suitable for both static and multiplexed displays. the output ports feature high current-sourcing capabili- ty to drive current into grids and anodes of static or multiplex vfds. the ports also have active current sink- ing for fast discharge of capacitive display electrodes in multiplexing applications. the 4-wire serial interface comprises a 20-bit shift reg- ister and a 20-bit transparent latch. the shift register is written through a clock input clk and a data input din. for the max6921, the data propagates to a data output dout. the data output allows multiple drivers to be cascaded and operated together. the output latch is transparent to the shift register outputs when load is high, and latches the current state on the falling edge of load. each driver output is a slew-rated controlled cmos push-pull switch driving between v bb and gnd (max6921) or v ss (max6931). the output rise time is always slower than the output fall time to avoid shoot-through currents during output transitions. the output slew rates are slow enough to minimize emi, yet are fast enough so as not to impact the typical 100? digit multiplex period and affect the display intensity. initial power-up and operation an internal reset circuit clears the internal registers ofthe max6921/max6931 on power-up. all outputs out0 to out19 and the interface output dout (max6921 only) initialize low regardless of the initial logic levels of the clk, din, blank, and load inputs. 4-wire serial interface the max6921/max6931 use 4-wire serial interface withthree inputs (din, clk, load) and a data output (dout, max6921 only). this interface is used to write output data to the max6921/max6931 (figure 4) (table 1). the serial interface data word length is 20 bits, d0?19. the functions of the four serial interface pins are: clk input is the interface clock, which shifts data into the max6921/max6931s?20-bit shift register onits rising edge. load input passes data from the max6921/ max6931s?20-bit shift register to the 20-bit outputlatch when load is high (transparent latch), and latches the data on load? falling edge din is the interface data input, and must be stable when it is sampled on the rising edge of clk. dout is the interface data output, which shifts data out from the max6921? 20-bit shift register on therising edge of clk. data at din is propagated through the shift register and appears at dout (20 clk cycles + t do ) later. a fifth input, blank, can be taken high to force outputsout0 to out19 low, without altering the contents of the output latches. when the blank input is low, outputs out0 to out19 follow the state of the output latches. a common use of the blank input is pwm intensity control. the blank input? function is independent of the oper- ation of the serial interface. data can be shifted into the serial interface shift register and latched regardless of the state of blank. max6921/max6931 20-output, 76v, serial-interfaced vfd tube drivers ___________________________________________________ ____________________________________ 7 slew-rate control v bb out_ 40 ? typical750 ? typical figure 2. max6921 cmos output driver structure slew-rate control v bb v ss out_ 40 ? typical750 ? typical figure 3. max6931 cmos output driver structure downloaded from: http:///
max6921/max6931 writing device registers using the 4-wire serial interface the max6921/max6931 are normally written using thefollowing sequence: 1) take clk low. 2) clock 20 bits of data in order d19 first to d0 last into din, observing the data setup and hold times. 3) load the 20 output latches with a falling edge on load. load can be high or low during a transmission. ifload is high, then the data shifted into the shift regis- ter at din appear at the out0 to out19 outputs. clk and din can be used to transmit data to otherperipherals. activity on clk always shifts data into the max6921/max6931s?shift register. however, the max6921/max6931 only update their output latch on the rising edge of load, and the last 20 bits of data are loaded. therefore, multiple devices can share clk and din, as long as they have unique load controls. determining driver output voltage drop the outputs are cmos drivers, and have a resistivecharacteristic. the typical and maximum sink and source output resistances can be calculated from the v h and v l electrical characteristics. use this calculated resistance to determine the output voltage drop at dif-ferent output currents. 20-output, 76v, serial-interfaced vfd tube drivers 8 __________________________________________________ _____________________________________ load t csw t cp t csh t ch t dh t do t ds d19 d18 d1 d0 d19 t cl clk din dout figure 4. 4-wire serial interface timing diagram clock input shift register contents load input latch contents blanking input output contents serial data input din clk d0 d1 d2 dn-1 dn load d0 d1 d2 dn-1 dn blank d0 d1 d2 dn-1 dn h h r0 r1 rn-2 rn-1 l l r0 r1 rn-2 rn-1 x r0 r1 r2 rn-1 rn x x x x x l r0 r1 r2 rn-1 rn p0 p1 p2 pn-1 pn h p0 p1 p2 pn-1 pn l p0 p1 p2 pn-1 pn xxxx x h lll l l table 1. 4-wire serial interface truth table l = low logic level. h = high logic level. x = don? care. p = present state (shift register). r = previous state (latched). downloaded from: http:///
output current ratings the continuous current-source capability is 40ma peroutput. outputs can drive up to 75ma as a repetitive peak current, subject to the on-time (output high) being no longer than 1ms, and the duty cycle being such that the output power dissipation is no more than the dissipa- tion for the continuous case. the repetitive peak rating allows outputs to drive a higher current in multiplex grid driver applications, where only one grid is on at a time, and the multiplex time per grid is no more than 1ms. since dissipation is proportional to current squared, the maximum current that can be delivered for a given mul- tiplex ratio is given by: i peak = (grids x 1600) 1/2 ma where grids is the number of grids in a multiplexed display. this means that a duplex application (two grids) can use a repetitive peak current of 56.5ma, a triplex (three grids) application can use a repetitive peak current of 69.2ma, and higher multiplex ratios are limited to 75ma. paralleling outputs any number of outputs within the same package canbe paralleled in order to raise the current drive or reduce the output resistance. only parallel outputs directly (by shorting outputs together) if the interface control can be guaranteed to set the outputs to the same level. although the sink output is relatively weak (typically 750 ? ), that resistance is low enough to dissi- pate 530mw when shorted to an opposite level outputat a v bb voltage of only 20v. a safe way to parallel out- puts is to use diodes to prevent the outputs from sink-ing current (figure 5). because the outputs cannot sink current from the vfd tube, an external discharge resis- tor, r, is required. for static tubes, r can be a large value such as 100k ? . for multiplexed tubes, the value of the resistor can be determined by the load capaci-tance and timing characteristics required. resistor r discharges tube capacitance c to 10% of the initial voltage in 2.3 x rc seconds. so, for example, a 15k ? value for r discharges 100pf tube grid or anode from40v to 4v in 3.5?, but draws an additional 2.7ma from the driver when either output is high. power dissipation take care to ensure that the maximum package dissi-pation ratings for the chosen package are not exceed- ed. over-dissipation is unlikely to be an issue when driving static tubes, but the peak currents are usually higher for multiplexed tubes. when using multiple dri- ver devices, try to share the average dissipation evenly between the drivers. determine the power dissipation (p d ) for the max6921/max6931 for static tube drivers with the fol-lowing equation: p d = (v cc x i cc ) + (v bb x i bb ) + ((v bb - v h ) x i anode x a) where:a = number of anodes driven (the max6921/max6931 can drive a maximum of 20). i anode = maximum anode current. (v bb - v h ) is the output voltage drop at the given maxi- mum anode current i out . a static tube dissipation example follows: v cc = 5v ?%, v bb = 10v to 18v, a = 20, i out = 2ma p d = (5.25v x 1ma)+ (18v x 1.4ma) + ((2.5v x 2ma/25ma) x 2ma x 20) = 38mw determine the power dissipation (p d ) for the max6921/ max6931 for multiplex tube drivers with the followingequation: p d = (v cc x i cc ) + (v bb x i bb ) + ((v bb - v h ) x i anode x a) + ((v bb - v h ) x i grid ) where:a = number of anodes driven. g = number of grids driven. i anode = maximum anode current. i grid = maximum grid current. the calculation presumes all anodes are on, but onlyone grid is on. the calculated p d is the worst case, presuming one digit is always being driven with all itsanodes lit. actual p d can be estimated by multiplying this p d figure by the actual tube drive duty cycle, taking into account interdigit blanking and any pwm intensitycontrol. max6921/max6931 20-output, 76v, serial-interfaced vfd tube drivers ___________________________________________________ ____________________________________ 9 max6921max6931 out0out1 d1d2 r output figure 5. paralleling outputs downloaded from: http:///
max6921/max6931 a multiplexed tube dissipation example follows: v cc = 5v ?%, v bb = 36v to 42v, a = 12, g = 8, i anode = 0.4ma, i grid = 24ma p d = (5.25v x 1ma)+ (42v x 1.4ma) + ((2.5v x 0.4ma/25ma) x 0.4ma x 12) + ((2.5v x 24ma/25ma) x 24ma) = 122mw thus, for a 28-pin wide tssop package (t ja = 1 / 0.0128 = 78.125?/w from absolute maximum ratings ), the maximum allowed ambient temperature t a is given by: t j(max) = t a + (p d x t ja ) = 150? = t a + (0.122 x 78.125?/w) so t a = +140.5?. this means that the driver can be operated in thisapplication up to the max6921/max6931s?+125? maximum operating temperature. power-supply considerations the max6921/max6931 operate with multiple power-supply voltages. bypass the v cc , v bb , and v ss (max6931 only) power-supply pins to gnd with 0.1?capacitors close to the device. the max6931 can be operated with v ss connected to gnd if a negative bias supply is not required. for multiplex applications, itmay be necessary to add an additional bulk electrolytic capacitor of 1? or greater to the v bb supply. power-supply sequencing the order of the power-supply sequencing is not impor-tant. the max6921/max6931 will not be damaged if any combination of v cc , v bb , and v ss (max6931 only) is grounded while the other supply or supplies aremaintained up to their maximum ratings. however, as with any cmos device, do not drive the max6921/ max6931s?logic inputs if the logic supply v cc is not operational because the input protection diodes clampthe signals. cascading drivers (max6921 only) multiple max6921s can be cascaded, as shown in the typical application circuit , by connecting each driver? dout to din of the next drivers. devices can be cas-caded at the full 5mhz clk speed when v cc 4.5v. when v cc <4.5v, the longer propagation delay (t do ) limits the maximum cascaded clk to 4mhz. 20-output, 76v, serial-interfaced vfd tube drivers 10 _________________________________________________ _____________________________________ max6921 dinclk load blank max685x vfdout vfclk vfload vfblank dout vfd tube max6921 dinclk load blank dout max6921 dinclk load blank dout typical application circuit downloaded from: http:///
max6921/max6931 20-output, 76v, serial-interfaced vfd tube drivers ___________________________________________________ ___________________________________ 11 pin configurations top view wide so tssop plcc tssop 2827 26 25 24 23 22 21 20 19 18 17 16 15 1 23 4 5 6 7 8 9 1011 12 13 14 v cc dinout0 out1 out2 out3 clk out4out5 out6 out7 out8 out9 load gnd blank out10 out11 out12 out13 out14 out15 out16 out17 out18 out19 dout v bb max6921awi 2827 26 25 24 23 22 21 20 19 18 17 16 15 12 3 4 5 6 7 8 9 1011 12 13 14 out5out6 out7 out8 out9 load out14 clkgnd blank out10 out11 out12 out13 out15 out16 out17 out18 out19 dout v bb v cc din out0 out1 out2 out3 out4 max6921aui 2827 26 25 24 23 22 21 20 19 18 17 16 15 12 3 4 5 6 7 8 9 1011 12 13 14 out5out6 out7 out8 out9 load out14 clkgnd blank out10 out11 out12 out13 out15 out16 out17 out18 out19 v ss v bb v cc din out0 out1 out2 out3 out4 max6931aui max6921aqi out17out16 out15 out14 out13 out12 out11 out1out2 out3 out4 out5 out6 out7 out10 blank gnd clk load out9out8 out18out19 dout v bb v cc dinout0 12 13 14 15 16 17 18 1 2 3 42 6 27 28 19 20 21 22 23 24 25 56 7 8 9 10 11 downloaded from: http:///
max6921/max6931 20-output, 76v, serial-interfaced vfd tube drivers 12 _________________________________________________ _____________________________________ package information for the latest package outline information and land patterns, goto www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package draw-ings may show a different suffix character, but the drawing per- tains to the package regardless of rohs status. package type package code document no. 28 tssop u28+1 21-0066 28 wide so w28+1 21-0042 28 plcc q28+1 21-0049 chip information process: bicmos downloaded from: http:///
max6921/max6931 20-output, 76v, serial-interfaced vfd tube drivers maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 13 2010 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 10/03 initial release 1 4/10 added automotive and lead-free parts to ordering information 1 downloaded from: http:///

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