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參數資料
| 型號： | MM74HC242 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Inverting Quad TRI-STATE Transceiver |
| 中文描述： | 反相四三態收發器 |
| 文件頁數： | 1/6頁 |
| 文件大小： | 134K |
| 代理商： | MM74HC242 |
TL/L/5019
M
M
January 1988
MM54HC242/MM74HC242
Inverting Quad TRI-STATE
é
Transceiver
MM54HC243/MM74HC243 Quad TRI-STATE Transceiver
General Description
These TRI-STATE bidirectional inverting and non-inverting
buffers utilize advanced silicon-gate CMOS technology and
are intended for two-way asynchronous communication be-
tween data buses. They have high drive current outputs
which enable high speed operation when driving large bus
capacitances. These circuits possess the low power dissi-
pation and high noise immunity associated with CMOS cir-
cuits, but speeds comparable to low power Schottky TTL
circuits. They can also drive 15 LS-TTL loads.
The MM54HC243/MM74HC243 is a non-inverting buffer
and the MM54HC242/MM74HC242 is an inverting buffer.
Each device has one active high enable (GBA), and one
active low enable (GAB). GBA enables the A outputs and
GAB enables the B outputs. This device does not have
Schmitt trigger inputs.
All inputs are protected from damage due to static dis-
charge by diodes to V
CC
and ground.
Features
Y
Typical propagation delay: 12 ns
Y
TRI-STATE outputs
Y
Two way asynchronous communication
Y
High output current: 6 mA (74HC)
Y
Wide power supply range: 2–6V
Y
Low quiescent supply current: 80
m
A (74HC)
Connection Diagrams
Dual-In-Line Package
TL/L/5019–1
Top View
Order Number MM54HC242 or MM74HC242
Dual-In-Line Package
TL/L/5019–2
Top View
Order Number MM54HC243 or MM74HC243
Truth Tables
’HC242
Control Inputs
Data Port Status
GAB
GBA
A
B
H
L
H
L
H
H
L
L
OUTPUT
Isolated
Isolated
Input
Input
Isolated
Isolated
OUTPUT
’HC243
Control Inputs
Data Port Status
GAB
GBA
A
B
H
L
H
L
H
H
L
L
OUTPUT
Isolated
Isolated
Input
Input
Isolated
Isolated
OUTPUT
TRI-STATE
é
is a registered trademark of National Semiconductor Corp.
C
1995 National Semiconductor Corporation
RRD-B30M115/Printed in U. S. A.
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| MM74HC242J | Zener Diode 225 mW 3.9 V ±5%SOT-23; Package: SOT-23 (TO-236) 3 LEAD; No of Pins: 3; Container: Tape and Reel; Qty per Container: 3000 |
| MM74HC27 | Zener Diode 225 mW 68 V ±5%SOT-23; Package: SOT-23 (TO-236) 3 LEAD; No of Pins: 3; Container: Tape and Reel; Qty per Container: 3000 |
| MM54HC27 | Triple 3-Input NOR Gate |
| MM54HC27J | Triple 3-Input NOR Gate |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MM74HC242J | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Inverting Quad TRI-STATE Transceiver |
| MM74HC242N | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Inverting Quad TRI-STATE Transceiver |
| MM74HC243 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Inverting Quad TRI-STATE Transceiver |
| MM74HC243J | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Inverting Quad TRI-STATE Transceiver |
| MM74HC243N | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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