military and industrial temperature ranges idt54/74fct245t/at/ct fast cmos octal bidirectional transceiver 1 june 2002 military and industrial temperature ranges the idt logo is a registered trademark of integrated device technology, inc. ? 2002 integrated device technology, inc. dsc-5510/3 features: ? std., 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.) ? high drive outputs (-15ma i oh , 64ma i ol ) ? meets or exceeds jedec standard 18 specifications ? military product compliant to mil-std-883, class b and desc listed (dual marked) ? power off disable outputs permit "live insertion" ? available in the following packages: ? industrial: soic, ssop, qsop, tssop ? military: cerdip, lcc functional block diagram idt54/74fct245t/at/ct fast cmos octal bidirectional transceiver description: the idt octal bidirectional transceivers are built using an advanced dual metal cmos technology. the fct245t is designed for asynchronous two- way communication between data buses. the transmit/receive (t/ r ) input determines the direction of data flow through the bidirectional transceiver. transmit (active high) enables data from a ports to b ports, and receive (active low) from b ports to a ports. the output enable ( oe ) input, when high, disables both a and b ports by placing them in high z condition. a b 0 0 t/ r oe a b 1 1 a b 2 2 a b 3 3 a b 4 4 a b 5 5 a b 6 6 a b 7 7
military and industrial temperature ranges 2 idt54/74fct245t/at/ct fast cmos octal bidirectional transceiver pin configuration 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. pin names description oe output enable inputs (active low) t/ r transmit/recieve input a 0 - a 7 side a inputs or 3-state outputs b 0 - b 7 side b inputs or 3-state outputs pin description 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. note: 1. h = high voltage level x = don?t care l = low voltage level z = high impedance function table (1) inputs oe t/ r outputs l l bus b data to bus a l h bus a data to bus b h x high z state cerdip/ soic/ ssop/ qsop/ tssop top view 2 3 1 16 15 14 11 19 18 20 17 13 12 5 6 7 4 8 9 10 a 2 a 0 a 1 v cc a 3 a 6 a 4 a 5 a 7 gnd oe b 2 b 0 b 1 b 3 b 6 b 4 b 5 b 7 t/r 1 2 3 4 5 7 9 6 8 10 11 12 13 14 15 16 17 18 19 20 b 2 b 0 b 1 b 3 b 4 a 1 a 0 a 7 g n d b 7 b 6 b 5 t / r v c c o e index a 2 a 3 a 6 a 4 a 5 lcc top view
military and industrial temperature ranges idt54/74fct245t/at/ct fast cmos octal bidirectional transceiver 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%; military: t a = ?55c to +125c, v cc = 5.0v 10% 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 v oh output high voltage v cc = min i oh = ?6ma mil 2.4 3.3 ? v in = v ih or v il i oh = ?8ma ind v i oh = ?12ma mil 2 3 ? i oh = ?15ma ind v ol output low voltage v cc = min i ol = 48ma mil ? 0.3 0.55 v v in = v ih or v il i ol = 64ma ind i os short circuit current v cc = max., v o = gnd (3) ?60 ?120 ?225 ma output drive characteristics
military and industrial temperature ranges 4 idt54/74fct245t/at/ct fast cmos octal bidirectional transceiver 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 ? 0.15 0.25 ma/ current (4) outputs open v in = gnd mhz oe = t/ r = gnd one input toggling 50% duty cycle i c total power supply current (6) v cc = max. v in = v cc ? 1.5 3.5 ma outputs open v in = gnd fi = 10mhz 50% duty cycle v in = 3.4v ? 1.8 4.5 oe = t/ r = gnd v in = gnd one bit toggling v cc = max. v in = v cc ?36 (5) outputs open v in = gnd fi = 2.5mhz 50% duty cycle v in = 3.4v ? 5 14 (5) oe = t/ r = 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
military and industrial temperature ranges idt54/74fct245t/at/ct fast cmos octal bidirectional transceiver 5 74fct245at 74fct245ct symbol parameter condition (1) min. (2) max. min. (2) max. unit t plh propagation delay c l = 50pf 1.5 4.6 1.5 4.1 ns t phl a to b, b to a r l = 500 ? t pzh output enable time 1.5 6.2 1.5 5.8 ns t pzl oe to a or b t phz output disable time 1.5 5 1.5 4.8 ns t plz oe to a or b t pzh output enable time 1.5 6.2 1.5 5.8 ns t pzl t/ r to a or b (3) t phz output disable time 1.5 5 1.5 4.8 ns t plz t/ r to a or b (3) switching characteristics over operating range - industrial notes: 1. see test circuit and waveforms. 2. minimum limits are guaranteed but not tested on propagation delays. 3. this parameter is guaranteed but not tested. 54fct245t 54fct245at 54fct245ct symbol parameter condition (1) min. (2) max. min. (2) max. min. (2) max. unit t plh propagation delay c l = 50pf 1.5 7.5 1.5 4.9 1.5 4.5 ns t phl a to b, b to a r l = 500 ? t pzh output enable time 1.5 10 1.5 6.5 1.5 6.2 ns t pzl oe to a or b t phz output disable time 1.5 10 1.5 6 1.5 5.2 ns t plz oe to a or b t pzh output enable time 1.5 10 1.5 6.5 1.5 6.2 ns t pzl t/ r to a or b (3) t phz output disable time 1.5 10 1.5 6 1.5 5.2 ns t plz t/ r to a or b (3) switching characteristics over operating range - military
military and industrial temperature ranges 6 idt54/74fct245t/at/ct fast cmos octal bidirectional transceiver 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.
military and industrial temperature ranges idt54/74fct245t/at/ct fast cmos octal bidirectional transceiver 7 ordering information idt xx temp. range fct xxxx device type xx package x process fast cmos octal bidirectional transceiver 245t 245at 245ct so sog py q pg industrial options small outline ic soic - green shrink small outline package quarter-size small outline package thin shrink small outline package d l military options cerdip leadless chip carrier blank b industrial mil-std-883, class b 54 74 ? 55 c to +125 c ? 40 c to +85 c 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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