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SDAS062A − D2661, APRIL 1982 − REVISED MAY 1986
• 3-State Bus Driving Outputs
SN54ALS878A, SN54AS878 . . . JT PACKAGE
SN74ALS878A, SN74AS878 . . . DW OR NT PACKAGE
(TOP VIEW)
• Full Parallel-Access for Loading
• Buffered Control Inputs
1CLR
1OC
1D1
1D2
1D3
1D4
2D1
2D2
2D3
2D4
2OC
GND
V
CC
1
2
3
4
5
6
7
8
9
24
23
22
21
20
19
18
1CLK
1Q1
1Q2
1Q3
1Q4
2Q1
• Choice of True or Inverting Logic
’ALS878A, ’AS878 True Outputs
’ALS879A, ’AS879 Inverting Outputs
• Synchronous Clear
17 2Q2
• Package Options Include Plastic Small
Outline Packages, Both Plastic and
Ceramic Chip Carriers, and Standard
Plastic and Ceramic 300-mil DIPs
16
2Q3
2Q4
2CLK
2CLR
10 15
11 14
12 13
SN54ALS878A, SN54AS878 . . . FK PACKAGE
SN74ALS878A, SN74AS878 . . . FN PACKAGE
(TOP VIEW)
• Dependable Texas Instruments Quality and
Reliability
description
These dual 4-bit registers feature 3-state outputs
designed specifically for bus driving. This makes
these devices particularly suitable for implement-
ing buffer registers, I/O ports, bidirectional bus
drivers, and working registers.
4
3 2 1 28 27 26
1D2
1D3
1D4
NC
2D1
2D2
2D3
5
6
7
8
25
24
1Q2
1Q3
23 1Q4
22 NC
9
2Q1
Q22
2Q3
21
20
19
10
11
12
1314
16 1718
The dual 4-bit edge-triggered flip-flops enter data
on the low-to-high transition of the clock (1CLK
and 2CLK). All types have individual synchronous
clear inputs and output control pins for each group
of 4-bit registers.
15
SN54ALS879A, SN54AS879 . . . JT PACKAGE
SN74ALS879A, SN74AS879 . . . DW OR NT PACKAGE
(TOP VIEW)
The SN54ALS’ and SN54AS’ devices are
characterized for operation over the full military
temperature range of −55°C to 125°C. The
SN74ALS’ and SN74AS’ devices are character-
ized for operation from 0°C to 70°C.
V
1CLR
1OC
1D1
1D2
1D3
1D4
2D1
2D2
2D3
2D4
2OC
CC
1
2
3
4
5
6
7
8
9
24
23
22
21
20
19
18
17
16
1CLK
1Q1
1Q2
1Q3
1Q4
2Q1
2Q2
2Q3
2Q4
2CLK
2CLR
10 15
11 14
GND 12 13
SN54ALS879A, SN54AS879 . . . FK PACKAGE
SN74ALS879A, SN74AS879 . . . FN PACKAGE
(TOP VIEW)
4
3 2 1 28 27 26
25
1D2
1D3
1D4
NC
2D1
2D2
2D3
5
6
7
8
9
1Q2
1Q3
24
23 1Q4
22 NC
2Q1
2Q2
2Q3
21
20
19
10
11
121314
161718
15
NC − No internal connection
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Copyright 1986, Texas Instruments Incorporated
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ꢤ ꢨ ꢥ ꢤꢝ ꢞꢲ ꢠꢟ ꢣ ꢫꢫ ꢩꢣ ꢡ ꢣ ꢢ ꢨ ꢤ ꢨ ꢡ ꢥ ꢭ
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1
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