1 idt54/74fct245/a/c fast cmos octal bidirectional transceiver military and commercial temperature ranges june 2001 2001 integrated device technology, inc. dsc-5421/- c idt54/74fct245/a/c military and commercial temperature ranges fast cmos octal bidirectional transceiver description: the idt octal bidirectional transceivers are built using an advanced dual metal cmos technology. the fct245 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. the fct245 transceivers have non-inverting outputs. t/r a 0 a 1 a 2 a 3 a 4 a 5 a 6 a 7 b 7 b 6 b 5 b 4 b 3 b 2 b 1 b 0 oe 1 2 3 4 5 6 19 18 17 16 15 14 13 12 11 7 8 9 features: - idt54/74fct245 equivalent to fast? speed - idt54/74fct245a 25% faster than fast - idt54/74fct245c 40% faster than fast - ttl input and output level compatible - cmos output level compatible - i ol = 64ma (commercial) and 48ma (military) - input current levels only 5 m a max. - cmos power levels (2.5mw typ. static) - direction control and over-riding 3-state control - military product compliant to mil-std-883, class b and desc listed - meets or exceeds jedec standard 18 specifications - available in the following packages: commercial: soic military: cerdip, lcc, cerpack functional block diagram
2 military and commercial temperature ranges idt54/74fct245/a/c fast cmos octal bidirectional transceiver 1 2 3 4 5 7 9 6 8 10 11 12 13 14 15 16 17 18 19 20 l20-2 b 2 b 0 b 1 b 3 b 4 t/r a 1 a 0 v cc a 7 gnd b 7 b 6 b 5 index a 2 a 3 a 6 a 4 a 5 oe 2 3 1 16 15 14 11 19 18 20 17 13 12 5 6 7 4 d20-1 so20-2 e20-1 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 capacitance (t a = +25 o c, f = 1.0mhz) symbol parameter (1) conditions typ. max. unit c in input capacitance v in = 0v 6 10 pf c i/o i/o capacitance v out = 0v 8 12 pf note: 1. this parameter is measured at characterization but not tested. absolute maximum ratings (1) symbol rating commercial military unit v term (2) terminal voltage with respect to gnd C0.5 to +7 C0.5 to +7 v v term (3) terminal voltage with respect to gnd C0.5 to v cc C0.5 to v cc v t a operating temperature 0 to +70 C55 to +125 c t bias temperature under bias C55 to +125 C65 to +135 c t stg storage temperature C55 to +125 C65 to +150 c p t power dissipation 0.5 0.5 w i out dc output current 120 120 ma 8-link 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 reliab ility. no terminal voltage may exceed v cc by +.5v unless otherwise noted. 2. input and v cc terminals only. 3. outputs and i/o terminals only. dip/ soic/ cerpack top view lcc top view pin configuration 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 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 note: 1. h = high voltage level l = low voltage level x = don't care
3 idt54/74fct245/a/c fast cmos octal bidirectional transceiver military and commercial temperature ranges dc electrical characteristics over operating range following conditions apply unless otherwise specified: v lc = 0.2v; v hc = v cc - 0.2v commercial: t a = 0c to +70c, v cc = 5.0v 5%; military: t a = C55c to +125c, 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 v v il input low level guaranteed logic low level 0.8 v i i h input high current v cc = max. v i = v cc 5a (except i/o pins) v i = 2.7v 5 (4) i i l input low current v i = 0.5v C5 (4) (except i/o pins) v i = gnd C5 i i h input high current v cc = max. v i = v cc 15a (i/o pins only) v i = 2.7v 15 (4) i i l input low current v i = 0.5v C15 (4) (i/o pins only) v i = gnd C15 v ik clamp diode voltage v cc = min., i n = C18ma C0.7 C1.2 v i os short circuit current v cc = max. (3) , v o = gnd C60 C120 ma v oh output high voltage v cc = 3v, v in = v lc or v hc , i oh = C32 a v hc v cc v v cc = min. i oh = C300 a v hc v cc v in = v ih or v il i oh = C12ma mil. 2.4 4.3 i oh = C15ma com'l. 2.4 4.3 v ol output low voltage v cc = 3v, v in = v lc or v hc , i ol = 300 a gnd v lc v (port a and port b) v cc = min. i ol = 300 a gnd v lc (4) v in = v ih or v il i ol = 48ma mil. 0.3 0.55 i ol = 64ma com'l. 0.3 0.55 notes: 1. for conditions shown as max. or min., use appropriate value specified under electrical characteristics for the applicable dev ice type. 2. typical values are at v cc = 5.0v, +25c ambient and maximum loading. 3. not more than one output should be shorted at one time. duration of the short circuit test should not exceed one second. 4. this parameter is guaranteed but not tested.
4 military and commercial temperature ranges idt54/74fct245/a/c fast cmos octal bidirectional transceiver power supply characteristics v lc = 0.2v; v hc = v cc - 0.2v symbol parameter test conditions (1) min. typ. (2) max. unit i cc quiescent power supply current v cc = max. v in 3 v hc ; v in v lc 0.51.5ma d i cc quiescent power supply current ttl inputs high v cc = max. v in = 3.4v (3) 0.5 2 ma i ccd dynamic power supply current (4) v cc = max. outputs open oe = gnd t/ r = gnd or v cc one input toggling 50% duty cycle v in 3 v hc v in v lc 0.15 0.25 ma/mhz i c total power supply current (6) v cc = max. outputs open fi = 10mhz v in 3 v hc v in v lc (fct) 2 4ma 50% duty cycle t/ r = oe = gnd one bit toggling v in = 3.4v v in = gnd 2.3 5 v cc = max. outputs open fi = 2.5mhz v in 3 v hc v in v lc (fct) 3.56.5 (5) 50% duty cycle t/ r = oe = gnd eight bits toggling v in = 3.4v v in = gnd 5.5 14.5 (5) notes: 1. for conditions shown as max. or min., 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 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.
5 idt54/74fct245/a/c fast cmos octal bidirectional transceiver military and commercial temperature ranges t plh propagation delay c l = 50 pf 1.5 7 1.5 7.5 1.5 4.6 1.5 4.9 1.5 4.1 1.5 4.5 ns t phl a to b, b to a r l = 500 w t pzh output enable time 1.5 9.5 1.5 10 1.5 6.2 1.5 6.5 1.5 5.8 1.5 6.2 ns t pzl oe to a or b t phz output disable time 1.5 7.5 1.5 10 1.5 5 1.5 6 1.5 4.8 1.5 5.2 ns t plz oe to a or b t pzh output enabletime 1.5 9.5 1.5 10 1.5 6.2 1.5 6.5 1.5 5.8 1.5 6.2 ns t pzl t/ r to a or b (3) t phz output disable time 1.5 7.5 1.5 10 1.5 5 1.5 6 1.5 4.8 1.5 5.2 ns t plz t/ r to a or b (3) switching characteristics over operating range 54/74fct245 54/74fct245a 54/74fct245c coml. mil. coml. mil. coml. mil. symbol parameter condition (1) min. (2) max. min. (2) max. min. (2) max. min. (2) max. min. (2) max. min. (2) ma x. unit 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.
6 military and commercial temperature ranges idt54/74fct245/a/c fast cmos octal bidirectional transceiver 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. octal link octal link octal link octal link octal link test cir cuits and w a veforms propagation delay test circuits for all outputs enable and disable times set-up, hold, and release times pulse width switch position test switch open drain disable low closed enable low all other tests open 8-link definitions: c l = load capacitance: includes jig and probe capacitance. r t = termination resistance: should be equal to z out of the pulse generator. notes: 1. diagram shown for input control enable-low and input control disable-high. 2. pulse generator for all pulses: rate 1.0mhz; zo 50 w; t f 2.5ns; t r 2.5ns.
7 idt54/74fct245/a/c fast cmos octal bidirectional transceiver military and commercial temperature ranges corporate headquarters for sales: 2975 stender way 800-345-7015 or 408-727-6116 santa clara, ca 95054 fax: 408-492-8674 www.idt.com* *to search for sales office near you, please click the sales button found on our home page or dial the 800# above and press 2. the idt logo is a registered trademark of integrated device technology, inc. ordering information idt xx temp. range xxxx device type xx package x process so commercial options small outline ic (so20-2) octal bidirectional transceiver 54 74 C 55c to +125c 0c to +70c d e l military options cerdip (d20-1) cerpack (e20-1) leadless chip carrier (l20-2) blank b commercial mil-std-883, class b fct 245 245a 245c
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