1 idt74gtlp306 8-bit lvttl/gtlp bus transceiver industrial temperature range may 2002 2002 integrated device technology, inc. dsc-5978/9 c idt74gtlp306 industrial temperature range 8-bit lvttl/gtlp bus transceiver description: the gtlp306 is an 8-bit bus transceiver. it provides signal level translation, from lvttl to gtlp, for applications requiring a high-speed interface between cards operating at lvttl logic levels and back-planes operating at gtlp logic levels. gtlp provides reduced output swing (<1v), reduced input threshold levels, and output edge-rate control to minimize signal setting times. the gtlp306 is a derivative of the gunning transceiver logic (gtl) jedec standard jesd8-3 and incorporates internal edge-rate control, which is process, voltage, and temperature (pvt) compensated. the gtlp306 combines a transceiver function with an lvttl to gtlp translation. data polarity is non-inverting, and the data flow direction is controlled by the t/ r pin. the outputs are enabled to allow data through the device when oe is low. otherwise, both a and b are placed in a high- impedance state. gtlp output low voltage is less than 0.5v. the output high is 1.5v, and the receiver threshold is 1v. t / r oe a0 (lvttl i/o) b0 (gtlp i/o) to seven other channels the idt logo is a registered trademark of integrated device technology, inc. features: ? bidirectional interface between gtlp and lvttl logic levels ? edge rate control circuit reduces output noise ?v ref pin provides reference voltage for receiver threshold ? cmos technology for low power dissipation ? special pvt compensation circuitry to provide consistent perfor- mance over variations of process, supply voltage, and temperature ? 5v tolerant inputs on lvttl ports ? bus-hold to eliminate the need for external pull-up resistors for unused inputs to a-port ? power up/down and power-off high-impedance for live insertion ? ttl-compatible driver and control inputs ? high output source/sink 24ma on a-port pins ? flow-through architecture optimizes system layout ? open drain on gtlp to support wired or connection ? esd performance of >2000v ? available in tssop package functional block diagram
2 industrial temperature range idt74gtlp306 8-bit lvttl/gtlp bus transceiver tssop top view pin configuration oe a 0 a 1 gnd a 7 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1 v cc a 2 a 3 a 4 a 5 a 6 gnd t/ r b 1 b 0 b 7 v ref b 2 b 3 b 4 b 5 b 6 gnd gnd absolute maximum ratings (1,2) symbol rating max. unit v cc supply voltage ?0.5 to +7 v v i dc input voltage ?0.5 to +7 v v o dc output voltage, 3-state ?0.5 to +7 v v o dc output voltage, active ?0.5 to +7 v i ol dc output sink current into a-port 48 ma i oh dc output source current from a-port ?48 ma i ol dc output sink current into b-port 100 ma (in the low state) i ik dc input diode current v i < 0v ?50 ma i ok dc output diode current v o < 0v ?50 ma i ok dc output diode current v o > v cc +50 ma t stg storage temperature ?65 to +150 c 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. 2. unused inputs without bus-hold must be held high or low. capacitance (t a = +25c, f = 1.0mh z ) symbol parameter (1) conditions typ. (2) max. unit c in control pins v i = v ccq or 0 5 ? pf c i / o a-port v i = v ccq or 0 7 ? pf c i / o b-port v i = v ccq or 0 9 ? pf notes: 1. as applicable to the device type. 2. all typical values are at v cc = 3.3v. recommended operating conditions (1) symbol rating recommended unit v cc supply voltage 3.15 to 3.45 v v tt bus termination voltage 1 .35 to 1.65 v v i input voltage on a-port and control pins 0 to 5.5 v i oh high level output current (a-port) -24 ma i ol low level output current (a-port) +24 ma i ol low level output current (b-port) 50 ma t a operating temperature ?40 to +85 c note: 1. unused inputs without bus-hold must be held high or low. function table (1) inputs oe t/ r output h x high z on bus a and bus b l l bus b data to bus a l h bus a data to bus b note: 1. h = high voltage level x = don?t care l = low voltage level note: 1. a-port pins have bus-hold. all other pins are standard input, output, or i/o. pin description pin names description (1) oe output enable (active low) t/ r transmit/receive input v ref gtlp input reference voltage a 0 - a 7 side a inputs or 3-state outputs b 0 - b 7 side b inputs or 3-state outputs
3 idt74gtlp306 8-bit lvttl/gtlp bus transceiver industrial temperature range dc electrical characteristics over operating range following conditions apply unless otherwise specified: industrial: t a = ?40c to +85c, v ref = 1v, v cc = 3.3v 5% symbol parameter test conditions min. typ. (1) max. unit v ih b-port ? v ref + 0.05 ? v tt v all other ports ? 2 ? ? v il b-port ? 0 ? v ref ? 0.05 v all other ports ? ? ? 0.8 v ref gtlp ? ? 1 ? v gtl ? ? 0.8 ? v ik ?v cc = 3.15v i i = ?18ma ? ? ?1.2 v a-port v cc = min to max (2) i oh = ?100a v cc ?0.2 ? ? v oh v cc = 3.15v i oh = ?12ma 2.4 ? ? v i oh = ?24ma 2 ? ? a-port v cc = min to max (2) i ol = 100a ? ? 0.2 v ol v cc = 3.15v i ol = 24ma ? ? 0.5 v b-port v cc = 3.15v i ol = 40ma ? ? 0.4 i ol = 50ma ? ? 0.55 control pins v cc = 3.45v v i = 5.5v or 0v ? ? 5 a-port v cc = 3.45v v i = 5.5v ? ? 20 i i v i = 0 ? ? ?20 a b-port v cc = 3.45v v i = v tt ?? 5 v i = 0 ???5 i off a-port v cc = 0 v i or v o = 0 to 4.5v ? ? 100 a i i (hold) a-port v cc = 3.15v v i = 0.8v 75 ? ? a v i = 2v ?20 ? ? i ozh a-port v cc = 3.45v v o = 3.45 v ? ? 20 a b-port v o = 1.5v ? ? 5 i ozl a-port v cc = 3.45v v o = 0 ? ? ?20 a b-port v o = 0.55v ? ? ?5 v cc = 3.45v outputs high ? 7 18 i cc (v cc ) a or b ports i o = 0 outputs low ? 8 20 ma v i = v cc or gnd outputs disabled ? 8 20 ? i cc (3) a-port and control pins v cc = 3.45v one input at v cc - 0.6v ? 0 1 ma a or control inputs at v cc or gnd notes: 1. all typical values are at v cc = 3.3v and t a = 25c. 2. for conditions shown as max. or min., use appropriate value specified under recommended operating conditions. 3. ? i cc is the increase in supply current for each input that is at the specified lvttl voltage level rather than v cc or gnd.
4 industrial temperature range idt74gtlp306 8-bit lvttl/gtlp bus transceiver notes: 1. see test circuits and waveforms. t a = ?40c to +85c. 2. unless otherwise noted, v ref = 1v. 3. typical values are at v cc = 3.3v and t a = 25c. switching characteristics over operating range (1,2) symbol parameter min. typ. (3) max. unit t plh ax to bx 1 4 7.5 ns t phl 1 5.1 7.5 t plh bx to ax 1 5.8 8.3 ns t phl 1 4.9 8.3 t rise transition time, b outputs (20% to 80%) ? 2.6 ? ns t fall transition time, b outputs (20% to 80%) ? 2.6 ? ns t rise transition time, a outputs (10% to 90%) ? 2.5 ? ns t fall transition time, a outputs (10% to 90%) ? 2.5 ? ns t pzh, t pzl oe to ax 1 4.5 9.5 ns t phz, t plz 1 4.9 9.5 t plh oe to bx 1 5.4 9.5 ns t phl 1 6 9.5
5 idt74gtlp306 8-bit lvttl/gtlp bus transceiver industrial temperature range 6v open gnd input vm v 3v 0v vm v t w 500 ? c l = 50pf 500 ? 25 ? 30pf from output under test 1.5v (gtlp) 1.2v (gtl) from output under test s (1) (1) test circuits and waveforms test circuit for a outputs (1) note: 1. c l includes probes and jig capacitance. for b-port outputs, c l = 30pf is used for worst case edge rate. note: 1. c l includes probes and jig capacitance. note: all input pulses have the following characteristics: frequency = 10 mhz, t r = t f = 2 ns, z o = 50 ? . the outputs are measured one at a time with one transition per measurement. test circuit for b outputs (1) voltage waveforms pulse duration (vm = v cc /2 for a-port, 1v for gtlp b-port, and 0.8v for gtl b-port) switch position test switch t plh / t phl open t phz / t pzh gnd t plz / t pzl 6v note: 1. 1.5v for b-port gtlp. 1.2v for b-port gtl.
6 industrial temperature range idt74gtlp306 8-bit lvttl/gtlp bus transceiver output input 3v 0v (1) vm v 3v 0v (1) vm v t phl t plh output control 3v 0v 3v 0v v ol v oh ? 0.3v v oh v ol + 0.3v v cc /2 output waveform 1 (s at 6v) output waveform 2 (s at gnd) t pl z t pz l t pzh t phz v cc /2 v cc /2 v cc /2 note: waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. all input pulses have the following characteristics: frequency = 10 mhz, t r = t f = 2 ns, z o = 50 ? . the outputs are measured one at a time with one transition per measurement. voltage waveforms enable and disable times (a-port) voltage waveforms propagation delay times (2) test circuits and waveforms notes: 1. 1.5v for b-port gtlp, 1.2v for b-port gtl. 2. v m = v cc /2 for a-port, 1v for gtlp b-port, and 0.8v for gtl b-port.
7 idt74gtlp306 8-bit lvttl/gtlp bus transceiver industrial temperature range ordering information idt xx gtlp temp. range xxx xx package device type pg thin shrink small outline package 8-bit lvttl/gtlp bus transceiver 306 74 -40c to +85c 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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