industrial temperature range idt74fct2541at/ct fast cmos octal buffer/line driver 1 november 2003 industrial temperature range the idt logo is a registered trademark of integrated device technology, inc. ? 2003 integrated device technology, inc. dsc-5590/3 features: ? a and c grades ? low input and output leakage 1a (max.) ? cmos power levels ? true ttl input and output compatibility: ?v oh = 3.3v (typ.) ?v ol = 0.3v (typ.) ? resistor outputs (-15ma i oh , 12ma i ol ) ? meets or exceeds jedec standard 18 specifications ? reduced system switching noise ? available in soic, qsop, and tssop packages functional block diagram idt74fct2541at/ct fast cmos octal buffer/line driver description: the idt octal buffer/line driver is built using an advanced dual metal cmos technology. the fct2541t is similar in function to the fct2244t, except that the inputs and outputs are on opposite sides of the package. this pinout arrangement makes these devices especially useful as output ports for microprocessors and as backplane drivers, allowing ease of layout and greater board density. the fct2541t has balanced output drive with current limiting resistors. this offers low ground bounce, minimal undershoot, and controlled output fall times, reducing the need for external series terminating resistors. the fct2541t is a plug-in replacement for the fct541t. d 0 d 2 d 3 d 4 d 5 d 6 d 7 d 1 o 1 oe b oe a o 0 o 2 o 3 o 4 o 5 o 6 o 7
industrial temperature range 2 idt74fct2541at/ct fast cmos octal buffer/line driver pin configuration pin names description oe a , oe b 3-state output enable inputs (active low) d x inputs o x outputs pin description note: 1. h = high voltage level x = don?t care l = low voltage level z = high impedance function table (1) inputs oe a oe b d outputs ll l l ll h h hh x z soic/ qsop/ tssop top view symbol description max unit v term (2) terminal voltage with respect to gnd ?0.5 to +7 v v term (3) terminal voltage with respect to gnd ?0.5 to v cc +0.5 v t stg storage temperature ?65 to +150 c i out dc output current ?60 to +120 ma absolute maximum ratings (1) notes: 1. stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. no terminal voltage may exceed vcc by +0.5v unless otherwise noted. 2. inputs and vcc terminals only. 3. output and i/o terminals only. symbol parameter (1) conditions typ. max. unit c in input capacitance v in = 0v 6 10 pf c out output capacitance v out = 0v 8 12 pf capacitance (t a = +25c, f = 1.0mhz) note: 1. this parameter is measured at characterization but not tested. d 0 d 1 d 2 d 3 d 4 d 5 d 6 d 7 gnd o 0 o 1 o 2 o 3 o 5 o 7 o 4 o 6 v cc 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 oe b oe a
industrial temperature range idt74fct2541at/ct fast cmos octal buffer/line driver 3 symbol parameter test conditions (1) min. typ. (2) max. unit v ih input high level guaranteed logic high level 2 ? ? v v il input low level guaranteed logic low level ? ? 0.8 v i ih input high current (4) v cc = max. v i = 2.7v ? ? 1a i il input low current (4) v cc = max. v i = 0.5v ? ? 1a i ozh high impedance output current v cc = max v o = 2.7v ? ? 1a i ozl (3-state output pins) (4) v o = 0.5v ? ? 1 i i input high current (4) v cc = max., v i = v cc (max.) ? ? 1a v ik clamp diode voltage v cc = min, i in = -18ma ? ?0.7 ?1.2 v v h input hysteresis ? ? 200 ? mv i cc quiescent power supply current v cc = max., v in = gnd or v cc ? 0.01 1 ma dc electrical characteristics over operating range following conditions apply unless otherwise specified: industrial: t a = ?40c to +85c, v cc = 5.0v 5% notes: 1. for conditions shown as min. or max., use appropriate value specified under electrical characteristics for the applicable dev ice type. 2. typical values are at v cc = 5.0v, +25c ambient. 3. not more than one output should be tested at one time. duration of the test should not exceed one second. 4. the test limit for this parameter is 5a at t a = ?55c. symbol parameter test conditions (1) min. typ. (2) max. unit i odl output low current v cc = 5v, v in = v ih or v il , v out = 1.5v (3) 16 48 ? m a i odh output high current v cc = 5v, v in = v ih or v il , v out = 1.5v (3) ?16 ?48 ? ma v oh output high voltage v cc = min i oh = ?15ma 2.4 3.3 ? v v in = v ih or v il v ol output low voltage v cc = min i ol = 12ma ? 0.3 0.5 v v in = v ih or v il output drive characteristics
industrial temperature range 4 idt74fct2541at/ct fast cmos octal buffer/line driver symbol parameter test conditions (1) min. typ. (2) max. unit ? i cc quiescent power supply current v cc = max. ? 0.5 2 ma ttl inputs high v in = 3.4v (3) i ccd dynamic power supply v cc = max. v in = v cc ? 0.06 0.12 ma/ current (4) outputs open v in = gnd mhz oe a = oe b = gnd one input toggling 50% duty cycle i c total power supply current (6) v cc = max. v in = v cc ? 0.6 2.2 ma outputs open v in = gnd fi = 10mhz 50% duty cycle v in = 3.4v ? 0.9 3.2 oe a = oe b = gnd v in = gnd one bit toggling v cc = max. v in = v cc ? 1.2 3.4 (5) outputs open v in = gnd fi = 2.5mhz 50% duty cycle v in = 3.4v ? 3.2 11.4 (5) oe a = oe b = gnd v in = gnd eight bits toggling notes: 1. for conditions shown as min. or max., use appropriate value specified under electrical characteristics for the applicable dev ice type. 2. typical values are at v cc = 5.0v, +25c ambient. 3. per ttl driven input; (v in = 3.4v). all other inputs at v cc or gnd. 4. this parameter is not directly testable, but is derived for use in total power supply calculations. 5. values for these conditions are examples of ? i cc formula. these limits are guaranteed but not tested. 6. i c = i quiescent + i inputs + i dynamic i c = i cc + ? i cc d h n t + i ccd (f cp /2+ f i n i ) i cc = quiescent current ? i cc = power supply current for a ttl high input (v in = 3.4v) d h = duty cycle for ttl inputs high n t = number of ttl inputs at d h i ccd = dynamic current caused by an input transition pair (hlh or lhl) f cp = clock frequency for register devices (zero for non-register devices) f i = output frequency n i = number of outputs at f i all currents are in milliamps and all frequencies are in megahertz. power supply characteristics notes: 1. see test circuit and waveforms. 2. minimum limits are guaranteed but not tested on propagation delays. fct2541at fct2541ct symbol parameter condition (1) min. (2) max. min. (2) max. unit t plh propagation delay c l = 50pf 1.5 4.8 1.5 4.1 ns t phl dx to ox r l = 500 ? t pzh output enable time 1.5 6.2 1.5 5.8 ns t pzl t phz output disable time 1.5 5.6 1.5 5.2 ns t plz switching characteristics over operating range
industrial temperature range idt74fct2541at/ct fast cmos octal buffer/line driver 5 pulse generator r t d.u.t . v cc v in c l v out 50pf 500 ? 500 ? 7.0v 3v 1.5v 0v 3v 1.5v 0v 3v 1.5v 0v 3v 1.5v 0v data input timing input asynchronous control preset clear etc. synchronous control t su t h t rem t su t h high-low-high pulse low-high-low pulse t w 1.5v 1.5v same phase input transition 3v 1.5v 0v 1.5v v oh t plh output opposite phase input transition 3v 1.5v 0v t plh t phl t phl v ol control input 3v 1.5v 0v 3.5v 0v output normally low output normally high switch closed switch open v ol 0.3v 0.3v t plz t pzl t pzh t phz 3.5v 0v 1.5v 1.5v enable disable v oh preset clear clock enable etc. octal link octal link octal link octal link octal link test circuits and waveforms propagation delay test circuits for all outputs enable and disable times set-up, hold, and release times pulse width notes: 1. diagram shown for input control enable-low and input control disable-high. 2. pulse generator for all pulses: rate 1.0mhz; t f 2.5ns; t r 2.5ns. test switch open drain disable low closed enable low all other tests open switch position definitions: c l = load capacitance: includes jig and probe capacitance. r t = termination resistance: should be equal to z out of the pulse generator.
industrial temperature range 6 idt74fct2541at/ct fast cmos octal buffer/line driver ordering information xxxx device type x package so q 2543at 2543ct octal latched transceiver - 40 to +85c 74 small outline ic quarter-size small outline package xx temperature range idt fct corporate headquarters for sales: for tech support: 2975 stender way 800-345-7015 or 408-727-6116 logichelp@idt.com santa clara, ca 95054 fax: 408-492-8674 (408) 654-6459 www.idt.com
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