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MM74HC640J Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # MM74HC640J
Description  Inverting Octal TRI-STATE Transceiver
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

MM74HC640J Datasheet(HTML) 1 Page - National Semiconductor (TI)

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TLF5344
January 1988
MM54HC640MM74HC640
Inverting Octal TRI-STATE
Transceiver
MM54HC643MM74HC643
True-Inverting Octal TRI-STATE Transceiver
General Description
These TRI-STATE bi-directional buffers utilize advanced sili-
con-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 and high noise
immunity usually associated with CMOS circuitry yet have
speeds comparable to low power Schottky TTL circuits
Each device has an active low enable G and a direction
control input DIR When DIR is high data flows from the A
inputs to the B outputs When DIR is low data flows from
the B inputs to the A outputs
The MM54HC640
MM74HC640 transfers inverted data from one bus to other
and the MM54HC643MM74HC643 transfers inverted data
from the A bus to the B bus and true data from the B bus to
the A bus
These devices 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
Features
Y
Typical propagation delay 13 ns
Y
Wide power supply range 2 – 6V
Y
Low quiescent current 80 mA maximum (74 HC)
Y
TRI-STATE outputs for connection to bus oriented
systems
Y
High output drive 6 mA (min)
Connection Diagrams
Dual-In-Line Package
TLF5344 – 1
Top View
Order Number MM54HC640 or MM74HC640
Dual-In-Line Package
TLF5344 – 2
Top View
Order Number MM54HC643 or MM74HC643
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
H e high level L e low level X e irrelevant
TRI-STATE
is a registered trademark of National Semiconductor Corp
C1995 National Semiconductor Corporation
RRD-B30M105Printed in U S A


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