integrated device technology, inc. military and commercial temperature ranges august 1995 1995 integrated device technology, inc. 6.9 dsc-4611/4 1 description: the idt octal bidirectional transceivers are built using an advanced dual metal cmos technology. the fct245t/ fct2245t, fct640t and fct645t are designed for asyn- chronous 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. the fct245t/fct2245t and fct645t transceivers have non-inverting outputs. the fct640t has inverting outputs. the fct2245t has balanced drive outputs 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 fct2xxxt parts are plug-in replacements for fctxxxt parts. fast cmos octal bidirectional transceivers idt54/74fct245t/at/ct/dt - 2245t/at/ct idt54/74fct640t/at/ct idt54/74fct645t/at/ct/dt features: common features: C low input and output leakage 1 m a (max.) C cmos power levels C true ttl input and output compatibility C v oh = 3.3v (typ.) C v ol = 0.3v (typ.) C meets or exceeds jedec standard 18 specifications C product available in radiation tolerant and radiation enhanced versions C military product compliant to mil-std-883, class b and desc listed (dual marked) C available in dip, soic, ssop, qsop, cerpack and lcc packages features for fct245t/fct640t/fct645t: C std., a, c and d speed grades C high drive outputs (-15ma i oh , 64ma i ol ) features for fct2245t: C std., a and c speed grades C resistor outputs (-15ma i oh , 12ma i ol com.) (-12ma i oh , 12ma i ol mil.) C reduced system switching noise 2539 drw 01 pin configurations functional block diagram 2539 drw 02 the idt logo is a registered trademark of integrated device technology, inc. lcc top view 5 6 7 8 9 10 a 1 a 2 a 3 1 2 3 4 20 19 18 17 16 15 14 13 vcc 12 11 t/r b 1 a 4 a 5 a 6 a 7 oe b 2 b 3 b 4 b 5 b 6 gnd b 7 a 0 b 0 p20-1 d20-1 so20-2 so20-7* so20-8** & e20-1 index b 0 b 1 b 2 b 3 b 4 a 2 a 3 a 4 a 5 a 6 b 7 b 6 b gnd a 7 a 0 a 1 vcc t/r oe 15 14 5 18 17 16 5 6 7 8 4 l20-2 9 10 11 12 13 32 1 20 19 *fct245t/2245t, fct645t only. **fct245t/2245t, fct640t dip/soic/ssop/qsop/cerpack top view fct245t/2245t, fct645t are non-inverting options. fct640t is the inverting options. 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 2539 drw 03
6.9 2 idt54/74fct245t/at/ct/dt - 2245t/at/ct, idt54/74fct640t/at/ct, idt54/74fct645t/at/ct/dt fast cmos octal bidirectional transceivers military and commercial temperature ranges function table (2) 2539 tbl 01 2539 tbl 02 notes: 1. 640 is inverting from input to output. 2. h = high voltage level l = low voltage level x = don't care absolute maximum ratings (1) capacitance (ta = +25 c, f = 1.0mhz) symbol rating commercial military unit v term (2) terminal voltage with respect to gnd ?.5 to +7.0 ?.5 to +7.0 v v term (3) terminal voltage with respect to gnd ?.5 to v cc +0.5 ?.5 to v cc +0.5 v t a operating temperature 0 to +70 ?5 to +125 c t bias temperature under bias ?5 to +125 ?5 to +135 c t stg storage temperature ?5 to +125 ?5 to +150 c p t power dissipation 0.5 0.5 w i out dc output current ?0 to +120 ?0 to +120 ma notes: 1. stresses greater than those listed under absolute maximum rat- ings 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 v cc by +0.5v unless otherwise noted. 2. input and v cc terminals only. 3. outputs and i/o terminals only. 2539 lnk 03 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 2539 lnk 04 note: 1. this parameter is measured at characterization but not tested. pin description pin names description oe output enable input (active low) t/ r transmit/receive input a 0 -a 7 side a inputs or 3-state outputs b 0 -b 7 side b inputs or 3-state outputs inputs oe oe t/ r r outputs l l bus b data to bus a (1) l h bus b data to bus b (1) h x high z state
idt54/74fct245t/at/ct/dt - 2245t/at/ct, idt54/74fct640t/at/ct, idt54/74fct645t/at/ct/dt fast cmos octal bidirectional transceivers military and commercial temperature ranges 6.9 3 dc electrical characteristics over operating range following conditions apply unless otherwise specified: commercial: t a = 0 c to +70 c, v cc = 5.0v 5%; military: t a = C55 c to +125 c, v cc = 5.0v 10% symbol parameter test conditions (1) min. typ. (2) max. unit v ih input high level guaranteed logic high level 2.0 v v il input low level guaranteed logic low level 0.8 v i i h input high current (4) v cc = max. v i = 2.7v 1 m a i i l input low current (4) v i = 0.5v 1 i ozh high impedance output current v cc = max. v o = 2.7v 1 m a 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.) 1 m a v ik clamp diode voltage v cc = min., i in = C18ma C0.7 C1.2 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 output drive characteristics for fct245t/640t/645t symbol parameter test conditions (1) min. typ. (2) max. unit v oh output high voltage v cc = min. v in = v ih or v il i oh = C6ma mil. i oh = C8ma com'l. 2.4 3.3 v i oh = C12ma mil. i oh = C15ma com'l. 2.0 3.0 v v ol output low voltage v cc = min. v in = v ih or v il i ol = 48ma mil. i ol = 64ma com'l. 0.3 0.55 v i os short circuit current v cc = max., v o = gnd (3) C60 C120 C225 ma output drive characteristics for fct2245t 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 ma i odh output high current v cc = 5v, v in = v ih or v il, v out = 1.5v (3) C16 C48 ma v oh output high voltage v cc = min. v in = v ih or v il i oh = C12ma mil. i oh = C15ma com'l. 2.4 3.3 v v ol output low voltage v cc = min. v in = v ih or v il i ol = 12ma 0.3 0.50 v 2539 lnk 05 2539 lnk 06 2539 lnk 07 notes: 1. for conditions shown as max. or min., use appropriate value specified under electrical characteristics for the applicable device type. 2. typical values are at vcc = 5.0v, +25 c ambient. 3. not more than one output should be shorted at one time. duration of the short circuit test should not exceed one second. 4. the test limit for this parameter is 5 m a at t a = C55 c.
6.9 4 idt54/74fct245t/at/ct/dt - 2245t/at/ct, idt54/74fct640t/at/ct, idt54/74fct645t/at/ct/dt fast cmos octal bidirectional transceivers military and commercial temperature ranges power supply characteristics notes: 1. for conditions shown as max. or min., use appropriate value specified under electrical characteristics for the applicable device type. 2. typical values are at v cc = 5.0v, +25 c 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 the i cc formula. these limits are guaranteed but not tested. 6. i c = i quiescent + i inputs + i dynamic i c = i cc + d i cc d h n t + i ccd (f cp/ 2 + f i n i ) i cc = quiescent current d 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 = input frequency n i = number of inputs at f i all currents are in milliamps and all frequencies are in megahertz. 2539 tbl 08 symbol parameter test conditions (1) min. typ. (2) max. unit d i cc quiescent power supply current ttl inputs high v cc = max. v in = 3.4v (3) 0.5 2.0 ma i ccd dynamic power supply current (4) v cc = max. outputs open v in = v cc v in = gnd fctxxxt 0.15 0.25 ma/ mhz oe = t/ r = gnd one input toggling 50% duty cycle fct2xxxt 0.06 0.12 i c total power supply current (6) v cc = max. v in = v cc fctxxxt 1.5 3.5 ma outputs open fi = 10mhz v in = gnd fct2xxxt 0.6 2.2 50% duty cycle v in = 3.4 fctxxxt 1.8 4.5 oe = t/ r = gnd one bit toggling v in = gnd fct2xxxt 0.9 3.2 v cc = max. v in = v cc fctxxxt 3.0 6.0 (5) outputs open fi = 2.5mhz v in = gnd fct2xxxt 1.2 3.4 (5) 50% duty cycle v in = 3.4 fctxxxt 5.0 14.0 (5) oe = t/ r = gnd eight bits toggling v in = gnd fct2xxxt 3.2 11.4 ( 5)
idt54/74fct245t/at/ct/dt - 2245t/at/ct, idt54/74fct640t/at/ct, idt54/74fct645t/at/ct/dt fast cmos octal bidirectional transceivers military and commercial temperature ranges 6.9 5 switching characteristics over operating range 2534 tbl 09 switching characteristics over operating range 2534 tbl 10 fct245t fct2245t fct245at fct2245at com'l. mil. com'l. mil. symbol parameter conditions (1) min. (2) max. min . (2) max. min . (2) max. min. (2) max. unit t plh t phl propagation delay a to b, b to a c l = 50 pf r l = 500 w 1.5 7.0 1.5 7.5 1.5 4.6 1.5 4.9 ns t pzh t pzl output enable time oe to a or b 1.5 9.5 1.5 10.0 1.5 6.2 1.5 6.5 ns t phz t plz output disable time oe to a or b 1.5 7.5 1.5 10.0 1.5 5.0 1.5 6.0 ns t pzh t pzl output enable time t/ r to a or b (3) 1.5 9.5 1.5 10.0 1.5 6.2 1.5 6.5 ns t phz t plz output disable time t/ r to a or b (3) 1.5 7.5 1.5 10.0 1.5 5.0 1.5 6.0 ns fct245ct fct2245ct fct245dt com'l. mil. com'l. mil. symbol parameter conditions (1) min. (2) max. min . (2) max. min . (2) max. min. (2) max. unit t plh t phl propagation delay a to b, b to a c l = 50 pf r l = 500 w 1.5 4.1 1.5 4.5 1.5 3.8 ns t pzh t pzl output enable time oe to a or b 1.5 5.8 1.5 6.2 1.5 5.0 ns t phz t plz output disable time oe to a or b 1.5 4.8 1.5 5.2 1.5 4.3 ns t pzh t pzl output enable time t/ r to a or b (3) 1.5 5.8 1.5 6.2 1.5 5.0 ns t phz t plz output disable time t/ r to a or b (3) 1.5 4.8 1.5 5.2 1.5 4.3 ns fct640t fct640at fct640ct com'l. mil. com'l. mil. com'l. mil. symbol parameter conditions (1) min . (2) max. min. (2) max. min . (2) max. min. (2) max. min. (2) max. min. (2) max. unit t plh t phl propagation delay a to b, b to a c l = 50 pf r l = 500 w 2.0 7.0 2.0 8.0 1.5 5.0 1.5 5.3 1.5 4.4 1.5 4.7 ns t pzh t pzl output enable time oe to a or b 2.0 13.0 2.0 16.0 1.5 6.2 1.5 6.5 1.5 5.8 1.5 6.2 ns t phz t plz output disable time oe to a or b 2.0 10.0 2.0 12.0 1.5 5.0 1.5 6.0 1.5 4.8 1.5 5.2 ns t pzh t pzl output enable time t/ r to a or b (3) 2.0 13.0 2.0 16.0 1.5 6.2 1.5 6.5 1.5 5.8 1.5 6.2 ns t phz t plz output disable time t/ r to a or b (3) 2.0 10.0 2.0 12.0 1.5 5.0 1.5 6.0 1.5 4.8 1.5 5.2 ns notes: 2534 tbl 11 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.
6.9 6 idt54/74fct245t/at/ct/dt - 2245t/at/ct, idt54/74fct640t/at/ct, idt54/74fct645t/at/ct/dt fast cmos octal bidirectional transceivers military and commercial temperature ranges switching characteristics over operating range fct645t fct645at com'l. mil. com'l. mil. symbol parameter conditions (1) min. (2) max. min . (2) max. min . (2) max. min. (2) max. unit t plh t phl propagation delay a to b, b to a c l = 50 pf r l = 500 w 1.5 9.5 1.5 11.0 1.5 4.6 1.5 4.9 ns t pzh t pzl output enable time oe to a or b 1.5 11.0 1.5 12.0 1.5 6.2 1.5 6.5 ns t phz t plz output disable time oe to a or b 1.5 12.0 1.5 13.0 1.5 5.0 1.5 6.0 ns t pzh t pzl output enable time t/ r to a or b (3) 1.5 11.0 1.5 12.0 1.5 6.2 1.5 6.5 ns t phz t plz output disable time t/ r to a or b (3) 1.5 12.0 1.5 13.0 1.5 5.0 1.5 6.0 ns 2534 tbl 12 fct645ct fct645dt com'l. mil. com'l. mil. symbol parameter conditions (1) min. (2) max. min . (2) max. min . (2) max. min. (2) max. unit t plh t phl propagation delay a to b, b to a c l = 50 pf r l = 500 w 1.5 4.1 1.5 4.5 1.5 3.8 ns t pzh t pzl output enable time oe to a or b 1.5 5.8 1.5 6.2 1.5 5.0 ns t phz t plz output disable time oe to a or b 1.5 4.8 1.5 5.2 1.5 4.3 ns t pzh t pzl output enable time t/ r to a or b (3) 1.5 5.8 1.5 6.2 1.5 5.0 ns t phz t plz output disable time t/ r to a or b (3) 1.5 4.8 1.5 5.2 1.5 4.3 ns notes: 2534 tbl 13 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.
idt54/74fct245t/at/ct/dt - 2245t/at/ct, idt54/74fct640t/at/ct, idt54/74fct645t/at/ct/dt fast cmos octal bidirectional transceivers military and commercial temperature ranges 6.9 7 test circuits and waveforms test circuits for all outputs set-up, hold and release times pulse width switch position pulse generator r t d.u.t. v cc v in c l v out 50pf 500 w 500 w 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. enable and disable times propagation delay 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 disable low enable low closed all other tests open open drain definitions: c l = load capacitance: includes jig and probe capacitance. r t = termination resistance: should be equal to z out of the pulse generator. 2534 drw 04 2534 drw 05 2534 drw 06 2534 drw 07 2534 drw 08 2534 lnk 14
6.9 8 idt54/74fct245t/at/ct/dt - 2245t/at/ct, idt54/74fct640t/at/ct, idt54/74fct645t/at/ct/dt fast cmos octal bidirectional transceivers military and commercial temperature ranges ordering information xx x package x process blank b commercial mil-std-883, class b p d so l e py q plastic dip cerdip small outline ic leadless chip carrier cerpack shrink small outline package quarter-size small outline package 245t 640t 645t 245at 640at 645at 245ct 640ct 645ct 245dt 645dt non-inverting octal bidirectional transceiver inverting octal bidirectional transceiver non-inverting octal bidirectional transceiver x device type high drive balanced drive blank 2 temperature range fct idt C55 c to +125 c 0 c to +70 c 54 74 family x 2539 drw 09
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