1 idt54/74fct2245t/at/ct fast cmos octal bidirectional transceiver military and commercial temperature ranges january 2000 1999 integrated device technology, inc. dsc-5511/- c idt54/74fct2245t/at/ct 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 fct2245t 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 trans- ceiver. 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 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 fct2245t parts are plug-in replacements for fct245t parts. functional block diagram 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 features: - low input and output leakage 1 a (max.) - extended commercial range of C40c to +85c - cmos power levels - true ttl input and output compatibility v oh = 3.3v (typ.) v ol = 0.3v (typ.) - meets or exceeds jedec standard 18 specifications - product available in radiation tolerant and radiation enhanced versions - military product compliant to mil-std-883, class b and desc listed (dual marked) - available in dip, soic, ssop, qsop, tssop, cerpack, and lcc packages - std., a and c speed grades - resistor outputs (-15ma i oh , 12ma i ol coml.) (-12ma i oh , 12ma i ol mil.) - reduced system switching noise
2 military and commercial temperature ranges idt54/74fct2245t/at/ct fast cmos octal bidirectional transceiver 2 3 1 16 15 14 11 19 18 20 17 13 12 5 6 7 4 p20-1 d20-1 so20-2 so20-7 so20-8 so20-9 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 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 a 1 a 0 a 7 gnd b 7 b 6 b 5 t/r v cc oe index a 2 a 3 a 6 a 4 a 5 absolute maximum ratings (1) symbol rating max. unit v term (2) terminal voltage with respect to gnd C0.5 to +7 v v term (3) terminal voltage with respect to gnd C0.5 to v cc +0.5 v t stg storage temperature C65 to +150 c i out dc output current C60 to +120 ma 8t-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 reliability. no terminal voltage may exceed vcc by +0.5v unless otherwise noted. 2. inputs and vcc terminals only. 3. outputs and i/o terminals only. 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 out output capacitance v out = 0v 8 12 pf 8t-link 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 function table (1) inputs oe t/r outputs l l bus b data to bus a (1) l h bus a data to bus b (1) h x high z state note: 1. h = high voltage level l = low voltage level x = don't care pin configuration dip/ soic/ ssop/ qsop/ tssop/ cerpack top view lcc top view
3 idt54/74fct2245t/at/ct fast cmos octal bidirectional transceiver military and commercial temperature ranges dc electrical characteristics over operating range following conditions apply unless otherwise specified: commercial: t a = -40c to +85c, v cc = 5.0v 5%; military: t a = -55c 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 ih input high current (4) v cc = max. v i = 2.7v 1 a i il input low current (4) v i = 0.5v 1 i ozh high impedance output current v cc = max. v o = 2.7v 1 a i ozl (3-state output pins) (4) v o = 0.5v 1 i i input high current v cc = max., v i = v cc (max.) 1 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 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 coml. 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 0.5 v 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. 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 5a at t a = -55c.
4 military and commercial temperature ranges idt54/74fct2245t/at/ct fast cmos octal bidirectional transceiver power supply characteristics 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 ma i ccd dynamic power supply current (4) v cc = max. outputs open v in = v cc v in = gnd 0.06 0.12 ma/ 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 0.62.2ma outputs open fi = 10mhz v in = gnd 50% duty cycle v in = 3.4 0.9 3.2 oe = t/ r = gnd one bit toggling v in = gnd v cc = max. v in = v cc 1.23.4 (5) outputs open fi = 2.5mhz v in = gnd 50% duty cycle v in = 3.4 3.2 11.4 ( 5) oe = t/ r = gnd eight bits toggling v in = gnd 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 idt54/74fct2245t/at/ct fast cmos octal bidirectional transceiver military and commercial temperature ranges switching characteristics over operating range-commercial (1) fct2245t fct2245at fct2245ct symbol parameter condition (1) 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 1.5 4.6 1.5 4.1 ns t pzh t pzl output enable time oe to a or b 1.5 9.5 1.5 6.2 1.5 5.8 ns t phz t plz output disable time oe to a or b 1.5 7.5 1.5 5 1.5 4.8 ns t pzh t pzl output enable time t/ r to a or b (3) 1.5 9.5 1.5 6.2 1.5 5.8 ns t phz t plz output disable time t/ r to a or b (3) 1.5 7.5 1.5 5 1.5 4.8 ns switching characteristics over operating range - military (1) fct2245t fct2245at fct2245ct symbol parameter condition (1) 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 7.5 1.5 4.9 1.5 4.5 ns t pzh t pzl output enable time oe to a or b 1.5 10 1.5 6.5 1.5 6.2 ns t phz t plz output disable time oe to a or b 1.5 10 1.5 6 1.5 5.2 ns t pzh t pzl output enable time t/ r to a or b (3) 1.5 10 1.5 6.5 1.5 6.2 ns t phz t plz output disable time t/ r to a or b (3) 1.5 10 1.5 6 1.5 5.2 ns notes: 1. see test circuit and waveforms. 2. miminum limits are guaranteed but not tested on propagation delays. 3. this parameter is guaranteed but not tested.
6 military and commercial temperature ranges idt54/74fct2245t/at/ct 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; t f 2.5ns; t r 2.5ns
7 idt54/74fct2245t/at/ct 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 2245t 2245at 2245ct octal bidirectional transceiver p d so py q pg e l plastic dip (p20-1) cerdip (d20-1) small outline ic (so20-2) shrink small outline package (so20-7) quarter-size small outline package (so20-8) thin shrink small outline package (so20-9) cerpack (e20-1) leadless chip carrier (l20-1) xx temp. range xxxx device type x package x process blank b commercial mil-std-883, class b 74 54 - 40c to +8 5c - 55c to +1 25c idt fct
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