HD74CBT3244 octal fet bus switch ade-205-643 (z) preliminary rev. 0 august 2001 description the HD74CBT3244 provides eight bits of high speed ttl-compatible bus switching in a standard ?244 device pinout. the low on state resistance of the switch allows connections to be made with minimal propagation delay. the device is organized as two 4-bit low impedance switches with separate output enable ( oe ) inputs. when oe is low, the switch is on, and data can flow from port a to port b, or vice versa. when oe is high, the switch is open, and the high impedance state exists between the two ports. features ? standard ?244 type pinout. ? minimal propagation delay through the switch. ? 5 ? switch connection between two ports. ? ttl-compatible input levels. ? ultra low quiescent power. -ideally suited for notebook applications.
HD74CBT3244 rev.0, aug. 2001, page 2 of 9 function table input oe oe oe oe function l a port = b port h disconnect h: high level l: low level pin arrangement 1 1 oe 1a1 2b4 1a2 2b3 1a3 2b2 1a4 v cc 2 o e 1b1 2a4 1b2 2a3 1b3 2a2 (top view) 2 3 4 5 6 7 8 20 19 18 17 16 15 14 2b1 gnd 1b4 2a1 9 10 12 11 13
HD74CBT3244 rev.0, aug. 2001, page 3 of 9 absolute maximum ratings item symbol ratings unit conditions supply voltage range v cc ? 0.5 to 7.0 v input voltage range *1 v i ? 0.5 to 7.0 v input clamp current i ik ? 50 ma v i < 0 continuous output current i o 128 ma v o = 0 to v cc continuous current through v cc or gnd i cc or i gnd 100 ma maximum power dissipation at ta = 25c (in still air) *2 p t 757 mw tssop storage temperature tstg ? 65 to 150 c notes: the absolute maximum ratings are values which must not individually be exceeded, and furthermore, no two of which may be realized at the same time. 1. the input and output voltage ratings may be exceeded even if the input and output clamp-current ratings are observed. 2. the maximum package power dissipation was calculated using a junction temperature of 150c. recommended operating conditions item symbol min max unit conditions supply voltage range v cc 4.5 5.5 v input voltage range v i 05.5v output voltage range v i/o 05.5v input transition rise or fall rate ? t / ? v05ns / vv cc = 4.5 to 5.5 v operating free-air temperature ta ? 40 85 c note: unused or floating inputs must be held high or low.
HD74CBT3244 rev.0, aug. 2001, page 4 of 9 block diagram 1b1 1a1 ? ? ? ? ? ? 2 18 1b4 1a4 8 12 1 1 oe 2b1 2a1 ? ? ? ? ? ? 11 9 2b4 2a4 17 3 19 2 oe
HD74CBT3244 rev.0, aug. 2001, page 5 of 9 dc electrical characteristics (ta = ? 40 to 85c) item symbol v cc (v) min typ *1 max unit test conditions clamp diode voltage v ik 4.5 ??? 1.2 v i in = ? 18 ma input voltage v ih 4.5 to 5.5 2.0 ?? v v il 4.5 to 5.5 ?? 0.8 on-state switch resistance *2 r on 4.5 ? 57 ? v in = 0 v, i in = 64 ma 4.5 ? 57 v in = 0 v, i in = 30 ma 4.5 ? 10 15 v in = 2.4 v, i in = 15 ma input current i in 0 to 5.5 ?? 1.0 av in = 5.5 v or gnd off-state leakage current i oz 5.5 ?? 1.0 a0 a, b v cc quiescent supply current i cc 5.5 ?? 3 av in = v cc or gnd, i o = 0 ma increase in i cc per input *3 ? i cc 5.5 ?? 2.5 ma one input at 3.4 v, other inputs at v cc or gnd notes: for condition shown as min or max use the appropriate values under recommended operating conditions. 1. all typical values are at v cc = 5 v (unless otherwise noted), ta = 25 c. 2. measured by the voltage drop between the a and b terminals at the indicated current through the switch. on-state resistance is determined by the lower voltage of the two (a or b) terminals. 3. this is the increase in supply current for each input that is at the specified ttl voltage level rather than v cc or gnd. capacitance (ta = 25c) item symbol v cc (v) min typ max unit test conditions control input capacitance c in 5.0 ? 3.5 ? pf v in = 0 or 3 v input / output capacitance c i/o (off) 5.0 ? 5 ? pf v o = 0 or 3 v oe = v cc note: this parameter is determined by device characterization is not production tested.
HD74CBT3244 rev.0, aug. 2001, page 6 of 9 switching characteristics (ta = ? 40 to 85c) ? v cc = 5.0 0.5 v item symbol min max unit test conditions from (input) to (output) propagation delay time *1 t plh t phl ? 0.25 ns c l = 50 pf r l = 500 ? a or b b or a enable time t zh t zl 1.0 8.9 ns c l = 50 pf r l = 500 ? oe a or b disable time t hz t lz 1.0 7.4 ns c l = 50 pf r l = 500 ? oe a or b note: 1. the propagation delay is the calculated rc time constant of the typical on-state resistance of the switch and the specified load capacitance, when driven by an ideal voltage source (zero output impedance). test circuit open s1 c l = 50 pf *1 500 ? load circuit for outputs symbol t / t plh phl t / t zh hz t / t zl lz s1 open open 7 v 500 ? see under table gnd note: 1. c l includes probe and jig capacitance.
HD74CBT3244 rev.0, aug. 2001, page 7 of 9 waveforms ? 1 input 10 % 1.5 v 1.5 v 90 % t r 90 % 3 v gnd 10 % t f output 1.5 v 1.5 v t plh v t phl oh v ol waveforms ? 2 waveform - b notes: 1. all input pulses are supplied by generators having the following characteristics : prr 10 mhz, z o = 50 ? , t r 2.5 ns, t f 2.5 ns. 2. waveform - a is for an output with internal conditions such that the output is low except when disabled by the output control. 3. waveform - b is for an output with internal conditions such that the output is high except when disabled by the output control. 4. the output are measured one at a time with one transition per measurement. waveform - a v oh v ol v + 0.3 v ol v - 0.3 v oh output control 10 % 10 % 1.5 v 1.5 v 90 % t f 90 % 3 v 3.5 v gnd gnd t r 1.5 v 1.5 v t hz t lz t zh t zl
HD74CBT3244 rev.0, aug. 2001, page 8 of 9 package dimensions hitachi code jedec eiaj mass (reference value) ttp-20da ? ? 0.07 g *dimension including the plating thickness base material dimension 0.50 0.10 *0.17 0.05 6.40 0.20 0.10 1.10 max 0.13 m 0.65 110 20 11 4.40 6.50 6.80 max *0.22 +0.08 ? 0.07 0.07 +0.03 ? 0.04 1.0 0.65 max 0.20 0.06 0.15 0.04 as of january, 2001 unit: mm 0 ? 8
HD74CBT3244 rev.0, aug. 2001, page 9 of 9 disclaimer 1. hitachi neither warrants nor grants licenses of any rights of hitachi ? s or any third party ? s patent, copyright, trademark, or other intellectual property rights for information contained in this document. hitachi bears no responsibility for problems that may arise with third party ? s rights, including intellectual property rights, in connection with use of the information contained in this document. 2. products and product specifications may be subject to change without notice. confirm that you have received the latest product standards or specifications before final design, purchase or use. 3. hitachi makes every attempt to ensure that its products are of high quality and reliability. however, contact hitachi ? s sales office before using the product in an application that demands especially high quality and reliability or where its failure or malfunction may directly threaten human life or cause risk of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation, traffic, safety equipment or medical equipment for life support. 4. design your application so that the product is used within the ranges guaranteed by hitachi particularly for maximum rating, operating supply voltage range, heat radiation characteristics, installation conditions and other characteristics. hitachi bears no responsibility for failure or damage when used beyond the guaranteed ranges. even within the guaranteed ranges, consider normally foreseeable failure rates or failure modes in semiconductor devices and employ systemic measures such as fail- safes, so that the equipment incorporating hitachi product does not cause bodily injury, fire or other consequential damage due to operation of the hitachi product. 5. this product is not designed to be radiation resistant. 6. no one is permitted to reproduce or duplicate, in any form, the whole or part of this document without written approval from hitachi. 7. contact hitachi ? s sales office for any questions regarding this document or hitachi semiconductor products. sales offices hitachi, ltd. semiconductor & integrated circuits nippon bldg., 2-6-2, ohte-machi, chiyoda-ku, tokyo 100-0004, japan tel: (03) 3270-2111 fax: (03) 3270-5109 copyright ? hitachi, ltd., 2001. all rights reserved. printed in japan. hitachi asia ltd. hitachi tower 16 collyer quay #20-00 singapore 049318 tel : <65>-538-6533/538-8577 fax : <65>-538-6933/538-3877 url : http://semiconductor.hitachi.com.sg url http://www.hitachisemiconductor.com/ hitachi asia ltd. (taipei branch office) 4/f, no. 167, tun hwa north road hung-kuo building taipei (105), taiwan tel : <886>-(2)-2718-3666 fax : <886>-(2)-2718-8180 telex : 23222 has-tp url : http://www.hitachi.com.tw hitachi asia (hong kong) ltd. group iii (electronic components) 7/f., north tower world finance centre, harbour city, canton road tsim sha tsui, kowloon hong kong tel : <852>-(2)-735-9218 fax : <852>-(2)-730-0281 url : http://semiconductor.hitachi.com.hk hitachi europe gmbh electronic components group dornacher stra?e 3 d-85622 feldkirchen postfach 201, d-85619 feldkirchen germany tel: <49> (89) 9 9180-0 fax: <49> (89) 9 29 30 00 hitachi europe ltd. electronic components group whitebrook park lower cookham road maidenhead berkshire sl6 8ya, united kingdom tel: <44> (1628) 585000 fax: <44> (1628) 585200 hitachi semiconductor (america) inc. 179 east tasman drive san jose,ca 95134 tel: <1> (408) 433-1990 fax: <1>(408) 433-0223 for further information write to: colophon 5.0
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