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SN74ALS621A-1

更新时间: 2024-11-17 11:07:55
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
15页 389K
描述
八路总线收发器/IOL=48mA O.C.

SN74ALS621A-1 数据手册

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SN74ALS620A, SN74ALS621A, SN74ALS623A, SN74AS623  
OCTAL BUS TRANSCEIVERS  
SDAS226A – DECEMBER 1982 – REVISED JANUARY 1995  
DW OR N PACKAGE  
(TOP VIEW)  
Local Bus-Latch Capability  
Choice of True or Inverting Logic  
Package Options Include Plastic  
Small-Outline (DW) Packages and Standard  
Plastic (N) 300-mil DIPs  
OEAB  
A1  
V
CC  
OEBA  
1
2
3
4
5
6
7
8
9
10  
20  
19  
18  
17  
16  
15  
14  
A2  
A3  
A4  
A5  
A6  
A7  
A8  
GND  
B1  
B2  
B3  
B4  
DEVICE  
SN74ALS620A  
OUTPUT  
3 state  
LOGIC  
Inverting  
True  
B5  
SN74ALS621A  
Open collector  
3 state  
13 B6  
12 B7  
SN74ALS623A, SN74AS623  
True  
11  
B8  
description  
These octal bus transceivers are designed for asynchronous two-way communication between data buses. The  
control-function implementation allows for maximum flexibility in timing.  
These devices allow data transmission from the A bus to the B bus or from the B bus to the A bus, depending  
upon the logic levels at the output-enable (OEAB and OEBA) inputs.  
The output-enable inputs disable the device so that the buses are effectively isolated. The dual-enable  
configuration gives the transceivers the capability to store data by simultaneously enabling OEAB and OEBA.  
Each output reinforces its input in this transceiver configuration. When both OEAB and OEBA are enabled and  
all other data sources to the two sets of bus lines are in the high-impedance state, both sets of bus lines (16 total)  
remain at their last states. The 8-bit codes appearing on the two sets of buses are identical for the  
SN74ALS621A, SN74ALS623A, and SN74AS623 or complementary for the SN74ALS620A.  
The -1 versions of the SN74ALS620A and SN74ALS621A are identical to the standard versions, except that  
the recommended maximum I is increased to 48 mA in the -1 versions.  
OL  
The SN74ALS620A, SN74ALS621A, SN74ALS623A, and SN74AS623 are characterized for operation from  
0°C to 70°C.  
FUNCTION TABLE  
INPUTS  
OPERATION  
SN74ALS621A  
OEAB  
SN74ALS620A  
SN74ALS623A  
SN74AS623  
OEBA  
L
H
H
L
H
L
B data to A bus  
A data to B bus  
Isolation  
B data to A bus  
A data to B bus  
Isolation  
B data to A bus,  
A data to B bus  
B data to A bus,  
A data to B bus  
L
H
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  

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