SN74AS639

更新时间： 2024-11-14 23:03:11

品牌	Logo	应用领域
德州仪器 - TI		总线收发器
页数	文件大小	规格书
7页	118K
描述
OCTAL BUS TRANSCEIVERS

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数据手册

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SN74AS639 数据手册

SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639

OCTAL BUS TRANSCEIVERS

SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995

DW OR N PACKAGE

(TOP VIEW)

• Bidirectional Bus Transceivers in

High-Density 20-Pin Packages

• Choice of True or Inverting Logic

DIR

• A-Bus Outputs Are Open Collector;

B-Bus Outputs Are 3 State

• Package Options Include Plastic

Small-Outline (DW) Packages and

Standard Plastic (N) 300-mil DIPs

13 B6

12 B7

DEVICE

LOGIC

OUTPUT

SN74ALS638A, SN74AS638A Open collector

3 state

Inverting

True

GND

SN74ALS639A, SN74AS639

Open collector

3 state

description

These octal bus transceivers are designed for asynchronous two-way communication between open-collector

and 3-state buses. The devices transmit data from the A bus (open-collector) to the B bus (3 state) or from the

B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input

can be used to disable the device so the buses are isolated.

The -1 version of SN74ALS638A is identical to the standard version, except that the recommended maximum

is increased to 48 mA.

The SN74ALS638A, SN74ALS639A, SN74AS638A, and SN74AS639 are characterized for operation from 0°C

to 70°C.

FUNCTION TABLE

INPUTS

OPERATION

SN74ALS638A

SN74ALS639A

SN74AS639

DIR

SN74AS638A

B data to A bus

A data to B bus

Isolation

B data to A bus

A data to B bus

Isolation

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

12 3 4 5 6 7

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与SN74AS639相关器件

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SN74AS639DW	ROCHESTER	获取价格	AS SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO20, PLASTIC, SOP-20
SN74AS639DW	TI	获取价格	OCTAL BUS TRANSCEIVERS
SN74AS639DW3	TI	获取价格	IC,BUS TRANSCEIVER,SINGLE,8-BIT,AS-TTL,SOP,20PIN,PLASTIC
SN74AS639DWP3	TI	获取价格	IC,BUS TRANSCEIVER,SINGLE,8-BIT,AS-TTL,SOP,20PIN,PLASTIC
SN74AS639DWR	TI	获取价格	Octal Bus Transceivers 20-SOIC 0 to 70
SN74AS639FN-00	TI	获取价格	AS SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PQCC20
SN74AS639FN3	TI	获取价格	IC,BUS TRANSCEIVER,SINGLE,8-BIT,AS-TTL,LDCC,20PIN,PLASTIC
SN74AS639J	TI	获取价格	IC,BUS TRANSCEIVER,SINGLE,8-BIT,AS-TTL,DIP,20PIN,CERAMIC
SN74AS639J4	TI	获取价格	IC,BUS TRANSCEIVER,SINGLE,8-BIT,AS-TTL,DIP,20PIN,CERAMIC
SN74AS639JP4	TI	获取价格	IC,BUS TRANSCEIVER,SINGLE,8-BIT,AS-TTL,DIP,20PIN,CERAMIC