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74640 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 74640
기능 Inverting Octal TRI-STATE Transceiver
제조업체 National Semiconductor
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74640 데이터시트, 핀배열, 회로
February 1988
MM54HCT640 MM74HCT640
Inverting Octal TRI-STATE Transceiver
MM54HCT643 MM74HCT643
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 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 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
TL F 5370 – 1
Top View
Order Number MM54HCT640 or MM74HCT640
TL F 5370 – 2
Top View
Order Number MM54HCT643 or MM74HCT643
Truth Table
Control
Inputs
Operation
G DIR
640
643
L L B data to A bus B data to A bus
L H A data to B bus A data to B bus
HX
Isolation
Isolation
Hehigh level Lelow level Xeirrelevant
TRI-STATE is a registered trademark of National Semiconductor Corp
C1995 National Semiconductor Corporation TL F 5370
RRD-B30M105 Printed in U S A




74640 pdf, 반도체, 판매, 대치품
Physical Dimensions inches (millimeters)
Cavity Dual-In line Package (J)
Order Number MM54HCT640J MM54HCT643J MM74HCT640J or MM74HCT643J
See NS Package J20A
LIFE SUPPORT POLICY
Moulded Dual-In line Package (N)
Order Number MM74HCT640N or MM74HCT643N
See NS Package N20A
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION As used herein
1 Life support devices or systems are devices or
systems which (a) are intended for surgical implant
into the body or (b) support or sustain life and whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling can
be reasonably expected to result in a significant injury
to the user
2 A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system or to affect its safety or
effectiveness
National Semiconductor
Corporation
1111 West Bardin Road
Arlington TX 76017
Tel 1(800) 272-9959
Fax 1(800) 737-7018
National Semiconductor
Europe
Fax (a49) 0-180-530 85 86
Email cnjwge tevm2 nsc com
Deutsch Tel (a49) 0-180-530 85 85
English Tel (a49) 0-180-532 78 32
Fran ais Tel (a49) 0-180-532 93 58
Italiano Tel (a49) 0-180-534 16 80
National Semiconductor
Hong Kong Ltd
13th Floor Straight Block
Ocean Centre 5 Canton Rd
Tsimshatsui Kowloon
Hong Kong
Tel (852) 2737-1600
Fax (852) 2736-9960
National Semiconductor
Japan Ltd
Tel 81-043-299-2309
Fax 81-043-299-2408
National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications

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