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參數資料
| 型號： | MM54HC245A |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Octal TRI-STATE Transceiver |
| 中文描述： | 八路三態收發器 |
| 文件頁數： | 1/6頁 |
| 文件大小： | 127K |
| 代理商： | MM54HC245A |
TL/F/5165
M
January 1988
MM54HC245A/MM74HC245A
Octal TRI-STATE
é
Transceiver
General Description
This TRI-STATE bidirectional buffer utilizes advanced sili-
con-gate CMOS technology, and is intended for two-way
asynchronous communication between data buses. It has
high drive current outputs which enable high speed opera-
tion even when driving large bus capacitances. This circuit
possesses the low power consumption and high noise im-
munity usually associated with CMOS circuitry, yet has
speeds comparable to low power Schottky TTL circuits.
This device has an active low enable input 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 MM54HC245A/
MM74HC245A transfers true data from one bus to the oth-
er.
This device can drive up to 15 LS-TTL Loads, and does not
have Schmitt trigger inputs. 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 (minimum)
Y
Same as the ’645
Connection Diagram
Dual-In-Line Package
TL/F/5165–1
Top View
Order Number MM54HC245A or MM74HC245A
Truth Table
Control
Inputs
Operation
G
DIR
L
L
H
L
H
X
B data to A bus
A data to B bus
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.
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| MM54HC253 | Dual 4-Channel TRI-STATE Multiplexer |
| MM54HC253J | Dual 4-Channel TRI-STATE Multiplexer |
| MM74HC253 | Dual 4-Channel TRI-STATE Multiplexer |
| MM74HC253J | Dual 4-Channel TRI-STATE Multiplexer |
| MM74HC253M | Dual 4-Channel TRI-STATE Multiplexer |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MM54HC245AJ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MM54HC245E/883 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MM54HC251J/883 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MM54HC251J/883C | 制造商:Texas Instruments 功能描述: |
| MM54HC253 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual 4-Channel TRI-STATE Multiplexer |
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