Texas Instruments SN74ALS623A-1DW, SN74ALS623A-1DWR, SN74ALS623A-1N, SN74ALS623AN, SN74ALS623AN3 Datasheet
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SN74ALS620A, SN74ALS621A, SN74ALS623A, SN74AS623
OCTAL BUS TRANSCEIVERS
SDAS226A – DECEMBER 1982 – REVISED JANUARY 1995
• 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
DEVICE OUTPUT
SN74ALS620A 3 state Inverting
SN74ALS621A Open collector True
SN74ALS623A, SN74AS623 3 state True
description
LOGIC
DW OR N PACKAGE
(TOP VIEW)
OEAB
GND
A1
A2
A3
A4
A5
A6
A7
A8
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
OEBA
B1
B2
B3
B4
B5
B6
B7
B8
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
OEBA
OEAB SN74ALS620A
L L B data to A bus B data to A bus
H HA data to B bus A data to B bus
H L Isolation Isolation
L H
B data to A bus,
A
data to B bus
OPERATION
SN74ALS621A
SN74ALS623A
SN74AS623
B data to A bus,
A data to B bus
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
Copyright 1995, Texas Instruments Incorporated
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SN74ALS620A, SN74ALS621A, SN74ALS623A, SN74AS623
OCTAL BUS TRANSCEIVERS
SDAS226A – DECEMBER 1982 – REVISED JANUAR Y 1995
logic symbols
†
SN74ALS620A
OEBA
OEAB
A1
A2
A3
A4
A5
A6
A7
A8
19
1
2
3
4
5
6
7
8
9
EN1
EN2
1
18
B1
2
17
16
15
14
13
12
11
B2
B3
B4
B5
B6
B7
B8
SN74ALS621A
A1
A2
A3
A4
A5
A6
A7
A8
19
1
2
3
4
5
6
7
8
9
OEBA
OEAB
†
These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
EN1
EN2
1
OEBA
OEAB
18
B1
2
17
16
15
14
13
12
11
B2
B3
B4
B5
B6
B7
B8
A1
A2
A3
A4
A5
A6
A7
A8
19
1
2
3
4
5
6
7
8
9
SN74ALS623A, SN74AS623
EN1
EN2
1
2
18
17
16
15
14
13
12
11
B1
B2
B3
B4
B5
B6
B7
B8
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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic diagrams (positive logic)
SN74ALS620A SN74ALS621A
OEBA
19
SN74ALS620A, SN74ALS621A, SN74ALS623A, SN74AS623
OCTAL BUS TRANSCEIVERS
SDAS226A – DECEMBER 1982 – REVISED JANUARY 1995
OEBA
19
OEAB
A1
1
2
To Seven Other Transceivers
OEBA
OEAB
A1
18
B1
SN74ALS623A, SN74AS623
19
1
OEAB
A1
1
2
To Seven Other Transceivers
182
B1
18
B1
To Seven Other Transceivers
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
Input voltage, V
Operating free-air temperature range, T
Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
: All inputs 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
I/O ports 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
: SN74ALS620A, SN74ALS623A 0°C to 70°C. . . . . . . . . . . . . . . . .
A
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
†
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