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SN74ALS870 Datasheet(PDF) 1 Page - Texas Instruments

Part No. SN74ALS870
Description  DUAL 16-BY-4 REGISTER FILES
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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DW OR NT PACKAGE
(TOP VIEW)
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S0
1A0
1A1
1A2
1A3
1W
S2
DQA1
DQA2
DQA3
DQA4
GND
VCC
S1
2A3
2A2
2A1
2A0
2W
S3
DQB4
DQB3
DQB2
DQB1
SN74ALS870
DUAL 16-BY-4 REGISTER FILES
SDAS139A – DECEMBER 1982 – REVISED JANUARY 1995
Copyright
© 1995, Texas Instruments Incorporated
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
3-State Buffer-Type Outputs Drive Bus
Lines Directly
Each Register File Has Individual
Write-Enable Controls and Address Lines
Designed Specifically for Multibus
Architecture and Overlapping File
Operations
Prioritized B-Input Port Prevents Write
Conflicts During Dual-Input Mode
Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic (NT) 300-mil DIPs
description
This device features two 16-word by 4-bit register
files. Each register file has individual write-enable
(1W, 2W) controls and address lines. This device has two 4-bit data I/O ports (DQA1–DQA4 and DQB1–DQB4).
The data I/O ports can output to bus A and bus B, receive input from bus A and bus B, receive input from bus
A and output to bus B, or output to bus A and receive input from bus B. To prevent writing conflicts in the
dual-input mode, the B-input port takes priority. Two select (S0 and S1) lines control which port has access to
which register. S2 determines whether the A ports are in the input or the output modes and S3 does likewise
for the B ports. The address lines (1A0 –1A3 or 2A0 –2A3) are decoded by an internal 1-of-16 decoder to select
which register word is to be accessed. All outputs are 3-state buffer-type outputs designed specifically to drive
bus lines directly.
The SN74ALS870 is characterized for operation from 0
°C to 70°C.
FUNCTION TABLE
FILE SELECT
INPUT/OUTPUT
S0
S1
FILE SEL
S2
S3
I/O SEL
L
L
1R to A, 1R to B
H
L
2R to A, 1R to B
L
L
A out B out
L
H
1R to A, 2R to B
L
L
A out, B out
H
H
2R to A, 2R to B
L
L
A to 1R, 1R to B
H
L
A to 2R, 1R to B
H
L
A in B out
L
H
A to 1R, 2R to B
H
L
A in, B out
H
H
A to 2R, 2R to B
L
L
1R to A, B to 1R
H
L
2R to A, B to 1R
L
H
A out B in
L
H
1R to A, B to 2R
L
H
A out, B in
H
H
2R to A, B to 2R
L
L
B to 1R
H
L
A to 2R, B to 1R
H
H
Ain B in
L
H
A to 1R, B to 2R
H
H
A in, B in
H
H
B to 2R
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.




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