Datasheet > 74LS245

74LS245

更新时间： 2024-11-17 22:53:15

品牌	Logo	应用领域
美国国家半导体 - NSC		总线收发器
页数	文件大小	规格书
6页	142K
描述
TRI-STATE Octal Bus Transceiver

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数据手册

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74LS245 数据手册

June 1989

54LS245/DM54LS245/DM74LS245

TRI-STATE Octal Bus Transceiver

General Description

These octal bus transceivers are designed for asynchro-

nous two-way communication between data buses. The

control function implementation minimizes external timing

requirements.

PNP inputs reduce DC loading on bus lines

Hysteresis at bus inputs improve noise margins

Typical propagation delay times, port-to-port 8 ns

Typical enable/disable times 17 ns

The device allows data transmission from the A bus to the B

bus or from the B bus to the A bus depending upon the logic

level at the direction control (DIR) input. The enable input

(G) can be used to disable the device so that the buses are

effectively isolated.

(sink current)

54LS

74LS

12 mA

24 mA

(source current)

54LS

74LS

12 mA

15 mA

Features

Alternate Military/Aerospace device (54LS245) is avail-

able. Contact a National Semiconductor Sales Office/

Distributor for specifications.

Bi-Directional bus transceiver in a high-density 20-pin

package

TRI-STATE outputs drive bus lines directly

Connection Diagram

Dual-In-Line Package

TL/F/6413–1

Order Number 54LS245DMQB, 54LS245FMQB, 54LS245LMQB,

DM54LS245J, DM54LS245W, DM74LS245WM or DM74LS245N

See NS Package Number E20A, J20A, M20B, N20A or W20A

Function Table

Direction

Enable

Operation

Control

DIR

B data to A bus

A data to B bus

Isolation

Low Level, X Irrelevant

High Level, L

TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.

1995 National Semiconductor Corporation

TL/F/6413

RRD-B30M105/Printed in U. S. A.

12 3 4 5 6

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与74LS245相关器件

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74LS245DC	ETC	获取价格	Bus Transceiver
74LS245DCQM	FAIRCHILD	获取价格	Bus Driver/Transceiver, 1-Func, 8-Bit, True Output, TTL, CDIP20,
74LS245DCQR	FAIRCHILD	获取价格	Bus Driver/Transceiver, 1-Func, 8-Bit, True Output, TTL, CDIP20,
74LS245PC	ETC	获取价格	Single 8-bit Bus Transceiver
74LS245PCQR	FAIRCHILD	获取价格	暂无描述
74LS245SC	ETC	获取价格	Single 8-bit Bus Transceiver
74LS247	ONSEMI	获取价格	LOW POWER SCHOTTKY
74LS247	HITACHI	获取价格	8CD-to-Seven-Segment Decoders/Drivers(with 15V outputs)
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74LS247DCQM	FAIRCHILD	获取价格	Decoder/Driver, TTL, CDIP16,