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SN74ALS1640ADW

更新时间： 2024-09-29 23:06:15
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
5页 92K
描述
OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS

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SN74ALS1640ADW 数据手册

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SN74ALS1640A, SN74ALS1645A  
OCTAL BUS TRANSCEIVERS  
WITH 3-STATE OUTPUTS  
SDAS246B – DECEMBER 1982 – REVISED FEBRUARY 1997  
DW OR N PACKAGE  
(TOP VIEW)  
Bidirectional Bus Transceivers in  
High-Density 20-Pin Packages  
Lower-Power Versions of SN74ALS640B  
and SN74ALS645A  
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  
Package Options Include Plastic  
Small-Outline (DW) Packages and Standard  
Plastic (N) 300-mil DIPs  
description  
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 on the level at the direction-control  
GND  
(DIR) input. The output-enable (OE) input can be used to disable the device so that the buses are effectively  
isolated. The SN74ALS1640A features inverting logic, while the SN74ALS1645A features noninverting logic.  
The SN74ALS1640A and SN74ALS1645A are characterized for operation from 0°C to 70°C.  
FUNCTION TABLE  
INPUTS  
OPERATION  
OE  
DIR  
L
SN74ALS1640A  
SN74ALS1645A  
B data to A bus  
A data to B bus  
Isolation  
L
L
B data to A bus  
A data to B bus  
Isolation  
H
H
X
†
logic symbols  
SN74ALS1640A  
G3  
SN74ALS1645A  
G3  
19  
19  
OE  
1
OE  
1
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.  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
Copyright 1997, 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  
12345

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