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MM54HCT640J Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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MM54HCT640J Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 4 page  TLF5370 February 1988 MM54HCT640MM74HCT640 Inverting Octal TRI-STATE Transceiver MM54HCT643MM74HCT643 True-Inverting Octal TRI-STATE Transceiver General Description These TRI-STATE bi-directional transceivers utilize advanced silicon-gate CMOS technology and are intended for two-way asynchronous communication between data buses They have high drive current outputs which enable high speed operation even when driving large bus capacitances These circuits possess the low power consumption of CMOS cir- cuitry yet have speeds comparable to low power Schottky TTL circuits All devices are TTL input compatible and can drive up to 15 LS-TTL loads and all inputs are protected from damage due to static discharge by diodes to VCC and ground Both the MM54HCT640MM74HCT640 and the MM54HCT643 MM74HCT643 have one active low enable input (G) and a direction control (DIR) When the DIR input is high data flows from the A inputs to the B outputs When DIR is low data flows from B to A The MM54HCT640 MM74HCT640 transfers inverted data from one bus to the other The MM54HCT643MM74HCT643 transfers inverted data from the A bus to the B bus and non-inverted data from the B bus to the A bus MM54HCTMM74HCT devices are intended to interface be- tween TTL and NMOS components and standard CMOS devices These parts are also plug-in replacements for LS- TTL devices and can be used to reduce power consumption in existing designs Features Y TTL input compatible Y Octal TRI-STATE outputs for mP bus applications 6 mA typical Y High speed 16 ns typical propagation delay Y Low power 80 mA maximum (74HCT) Connection Diagram Dual-In-Line Packages TLF5370 – 1 Top View Order Number MM54HCT640 or MM74HCT640 TLF5370 – 2 Top View Order Number MM54HCT643 or MM74HCT643 Truth Table Control Operation Inputs G DIR 640 643 LL B data to A bus B data to A bus LH A data to B bus A data to B bus H X Isolation Isolation Hehigh level Lelow level Xeirrelevant TRI-STATE is a registered trademark of National Semiconductor Corp C1995 National Semiconductor Corporation RRD-B30M105Printed in U S A |
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