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參數資料
| 型號： | MM74HC643J |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | Inverting Octal TRI-STATE Transceiver |
| 中文描述： | HC/UH SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, CDIP20 |
| 封裝： | DIP-20 |
| 文件頁數： | 1/6頁 |
| 文件大小： | 145K |
| 代理商： | MM74HC643J |
TL/F/5344
M
T
January 1988
MM54HC640/MM74HC640
Inverting Octal TRI-STATE
é
Transceiver
MM54HC643/MM74HC643
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 MM54HC643/MM74HC643 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 V
CC
and ground.
Features
Y
Typical propagation delay: 13 ns
Y
Wide power supply range: 2–6V
Y
Low quiescent current: 80
m
A 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
TL/F/5344–1
Top View
Order Number MM54HC640 or MM74HC640
Dual-In-Line Package
TL/F/5344–2
Top View
Order Number MM54HC643 or MM74HC643
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
H
X
Isolation
Isolation
H
e
high level, L
e
low level, X
e
irrelevant
TRI-STATE
é
is a registered trademark of National Semiconductor Corp.
C
1995 National Semiconductor Corporation
RRD-B30M105/Printed in U. S. A.
相關PDF資料 |
PDF描述 |
|---|---|
| MM74HC643N | Inverting Octal TRI-STATE Transceiver |
| MM54HC646 | Non-Inverting Octal Bus Transceiver/Registers |
| MM54HC648 | Non-Inverting Octal Bus Transceiver/Registers |
| MM74HC646 | Non-Inverting Octal Bus Transceiver/Registers |
| MM74HC648 | Non-Inverting Octal Bus Transceiver/Registers |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MM74HC643N | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Inverting Octal TRI-STATE Transceiver |
| MM74HC646 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Non-Inverting Octal Bus Transceiver/Registers |
| MM74HC646N | 制造商:Texas Instruments 功能描述: |
| MM74HC648 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Non-Inverting Octal Bus Transceiver/Registers |
| MM74HC688 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:8-Bit Magnitude Comparator (Equality Detector) |
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