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MM74HCT643 Datasheet True-Inverting Octal TRI-STATE Transceiver

Manufacturer: National Semiconductor (now Texas Instruments)

Download the MM74HCT643 datasheet PDF. This datasheet also includes the MM74HCT640 variant, as both parts are published together in a single manufacturer document.

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Note: The manufacturer provides a single datasheet file (MM74HCT640-NationalSemiconductor.pdf) that lists specifications for multiple related part numbers.

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 circuitry 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 MM54HCT640 MM74HCT640 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 MM54HCT643 MM74HCT643 transfers inverted data from the A bus to the B bus and non-inverted data from the B bus to the A bus MM54HCT MM74HCT devices are intended to interface between TTL and NMOS components and standard CMOS devices These parts are also plug-in replacements for LSTTL devices and can be used to reduce power consumption in existing designs

Overview

MM54HCT640 MM74HCT640 Inverting Octal TRI-STATE Transceiver MM54HCT643 MM74HCT643 True-Inverting Octal TRI-STATE Transceiver February 1988 MM54HCT640 MM74HCT640 Inverting Octal TRI-STATE Transceiver MM54HCT643.

Key Features

  • Y TTL input compatible Y Octal TRI-STATE outputs for mP bus.

More Datasheets from National Semiconductor (now Texas Instruments)

Part Number Description
MM74HCT640 Inverting Octal TRI-STATE Transceiver
MM74HCT688 8-Bit Magnitude Comparator
MM74HCT05 Hex Inverter
MM74HCT190 Synchronous Decade Up/Down Counters
MM74HCT191 Synchronous Binary Up/Down Counters
MM74HCT373 Octal D-Type Flip-Flop
MM74HCT374 Octal D-Type Flip-Flop
MM74HCT574 Octal D-Type Flip-FLop
MM74HC00 Quad 2-Input NAND Gate
MM74HC112 Dual J-K Flip-Flop