industrial temperature range idt74fct2245at/ct fast cmos octal bidirectional transceiver 1 june 2006 industrial temperature range the idt logo is a registered trademark of integrated device technology, inc. ? 2006 integrated device technology, inc. dsc-5511/6 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.) ? meets or exceeds jedec standard 18 specifications ? resistor outputs -15ma i oh , 12ma i ol ? reduced system switching noise ? available in soic and qsop packages functional block diagram idt74fct2245at/ct 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. 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
industrial temperature range 2 idt74fct2245at/ct fast cmos octal bidirectional transceiver pin configuration 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 binputs or 3-state outputs pin description note: 1. h = high voltage level x = don?t care l = low voltage level 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 soic/ qsop top view 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 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.
industrial temperature range idt74fct2245at/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 i = 2.7v ? ? 1a i ozl (3-state output pins) (4) v i = 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. ? 0.01 1 ma v in = gnd or v cc 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 5 a at ta = -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 ? ma 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 idt74fct2245at/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 ? 0.06 0.12 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 ? 0.6 2.2 ma outputs open v in = gnd fi = 10mhz 50% duty cycle v in = 3.4v ? 0.9 3.2 oe = t/ r = gnd v in = gnd one bittoggling 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 = 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
industrial temperature range idt74fct2245at/ct fast cmos octal bidirectional transceiver 5 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. switching characteristics over operating range (1) 74fct2245at 74fct2245ct symbol parameter condition (1) min . (2) max. min . (2) max. unit t plh propagation delay c l = 50 pf 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)
industrial temperature range 6 idt74fct2245at/ct fast cmos octal bidirectional transceiver pulse generator r t d.u.t . v cc v in c l v out 50pf 500w 500w 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 idt74fct2245at/ct fast cmos octal bidirectional transceiver 7 ordering information idt xx temp. range fct xxxx device type xx package octal bidirectional transceiver 2245at 2245ct so sog q qg small outline ic soic - green quarter-size small outline package qsop - green 74 ? 40c to +85c corporate headquarters for sales: for tech support: 6024 silver creek valley road 800-345-7015 or 408-284-8200 logichelp@idt.com san jose, ca 95138 fax: 408-284-2775 www.idt.com
|
