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SN74ALS870DW Datasheet(PDF) 3 Page - Texas Instruments

Part No. SN74ALS870DW
Description  DUAL 16-BY-4 REGISTER FILES
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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SN74ALS870
DUAL 16-BY-4 REGISTER FILES
SDAS139A – DECEMBER 1982 – REVISED JANUARY 1995
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
logic diagram (positive logic)
REG1
REG2
Decoder
BIN/Y
16
1
2
3
4
15
0
Decoder
BIN/Y
16
1
2
3
4
15
0
16
16
Three Identical Channels Not Shown
2A0
2A1
2A2
2A3
DQB1
1A0
1A1
1A2
1A3
S0
S1
S2
S3
1W
2W
DQA1
RAM 16
×1
A
A,D
15
0
A
A
A,D
15
0
A
RAM 16
×1
2
3
4
5
1
23
7
17
6
18
8
19
20
21
22
13
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, VI: All inputs
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I/O ports
5.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage applied to a disabled 3-state output
5.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA
0
°C to 70°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.




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