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SN74AS641

更新时间： 2024-11-14 23:03:11
品牌 Logo 应用领域
德州仪器 - TI 总线收发器输出元件
页数 文件大小 规格书
7页 117K
描述
OCTAL BUS TRANSCEIVERS WITH OPEN-COLLECTOR OUTPUTS

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SN74AS641 数据手册

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SN74ALS641A, SN74ALS642A, SN74AS641  
OCTAL BUS TRANSCEIVERS  
WITH OPEN-COLLECTOR OUTPUTS  
SDAS300 – MARCH 1995  
DW OR N PACKAGE  
(TOP VIEW)  
• Bidirectional Bus Transceivers in  
High-Density 20-Pin Packages  
• Choice of True or Inverting Logic  
• Package Options Include Plastic  
Small-Outline (DW) Packages and  
Standard Plastic (N) 300-mil DIPs  
1
2
3
4
5
6
7
8
9
10  
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
DIR  
A1  
A2  
A3  
A4  
A5  
A6  
A7  
A8  
V
CC  
OE  
B1  
B2  
B3  
B4  
B5  
B6  
B7  
B8  
DEVICE  
LOGIC  
True  
SN74ALS641A, SN74AS641  
SN74ALS642A  
Inverting  
description  
GND  
These octal bus transceivers are designed for  
asynchronous two-way communication between  
data buses. These devices transmit data from the A bus to the B bus or from the B bus to the A bus, depending  
upon the level at the direction-control (DIR) input. The output-enable (OE) input disables the device so that the  
buses are effectively isolated.  
The -1 versions of the SN74ALS641A and SN74ALS642A are identical to the standard versions, except that  
the recommended maximum I is increased to 48 mA in the -1 versions.  
OL  
The SN74ALS641A, SN74ALS642A, and SN74AS641 are characterized for operation from 0°C to 70°C.  
FUNCTION TABLE  
INPUTS  
OPERATION  
SN74ALS641A  
OE  
DIR  
SN74ALS642A  
SN74AS641  
B data to A bus  
A data to B bus  
Isolation  
L
L
L
H
X
B data to A bus  
A data to B bus  
Isolation  
H
†
logic symbols  
SN74ALS641A, SN74AS641  
SN74ALS642A  
G3  
19  
19  
1
G3  
OE  
1
OE  
DIR  
3 EN1 [BA]  
3 EN2 [AB]  
DIR  
3 EN1 [BA]  
3 EN2 [AB]  
2
18  
2
18  
A1  
B1  
1
A1  
B1  
1
2
2
3
17  
16  
15  
14  
13  
12  
11  
3
4
5
6
7
8
9
17  
16  
15  
14  
13  
12  
11  
A2  
4
B2  
B3  
B4  
B5  
B6  
B7  
B8  
A2  
A3  
A4  
A5  
A6  
A7  
A8  
B2  
B3  
B4  
B5  
B6  
B7  
B8  
A3  
5
A4  
6
A5  
7
A6  
8
A7  
9
A8  
†
These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.  
Copyright 1995, Texas Instruments Incorporated  
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.  
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
1234567

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