SN54ALS878A_08 Datasheet, PDF (1/8 Pages) Texas Instruments – DUAL 4-BIT D-TYPE EDGE-TRIGGERED FLIP-FLOPS WITH 3-STATE OUTPUTS

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SN54ALS878A, SN54ALS879A, SN54AS878, SN54AS879
SN74ALS878A, SN74ALS879A, SN74AS878, SN74AS879
DUAL 4ĆBIT DĆTYPE EDGEĆTRIGGERED FLIPĆFLOPS WITH 3ĆSTATE OUTPUTS
SDAS062A − D2661, APRIL 1982 − REVISED MAY 1986
• 3-State Bus Driving Outputs
• Full Parallel-Access for Loading
• Buffered Control Inputs
• Choice of True or Inverting Logic
’ALS878A, ’AS878 True Outputs
’ALS879A, ’AS879 Inverting Outputs
• Synchronous Clear
• Package Options Include Plastic Small
Outline Packages, Both Plastic and
Ceramic Chip Carriers, and Standard
Plastic and Ceramic 300-mil DIPs
• Dependable Texas Instruments Quality and
Reliability
SN54ALS878A, SN54AS878 . . . JT PACKAGE
SN74ALS878A, SN74AS878 . . . DW OR NT PACKAGE
(TOP VIEW)
1CLR
1OC
1D1
1D2
1D3
1D4
2D1
2D2
2D3
2D4
2OC
GND
1 24
2 23
3 22
4 21
5 20
6 19
7 18
8 17
9 16
10 15
11 14
12 13
VCC
1CLK
1Q1
1Q2
1Q3
1Q4
2Q1
2Q2
2Q3
2Q4
2CLK
2CLR
SN54ALS878A, SN54AS878 . . . FK PACKAGE
SN74ALS878A, SN74AS878 . . . FN PACKAGE
(TOP VIEW)
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.
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.
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.
1D2
4
5
3
2
1
28 27 2625
1Q2
1D3 6
24 1Q3
1D4 7
23 1Q4
NC 8
22 NC
2D1 9
21 2Q1
2D2 10
20 Q22
2D3 11
19 2Q3
121314 _{15 16 1718}
SN54ALS879A, SN54AS879 . . . JT PACKAGE
SN74ALS879A, SN74AS879 . . . DW OR NT PACKAGE
(TOP VIEW)
1CLR
1OC
1D1
1D2
1D3
1D4
2D1
2D2
2D3
2D4
2OC
GND
1 24
2 23
3 22
4 21
5 20
6 19
7 18
8 17
9 16
10 15
11 14
12 13
VCC
1CLK
1Q1
1Q2
1Q3
1Q4
2Q1
2Q2
2Q3
2Q4
2CLK
2CLR
SN54ALS879A, SN54AS879 . . . FK PACKAGE
SN74ALS879A, SN74AS879 . . . FN PACKAGE
(TOP VIEW)
1D2
4
5
32
1
28 27 2625
1Q2
1D3 6
24 1Q3
1D4 7
23 1Q4
NC 8
22 NC
2D1 9
21 2Q1
2D2 10
20 2Q2
2D3 11
19 2Q3
121314 15 161718
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.
NC − No internal connection
Copyright  1986, Texas Instruments Incorporated
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
• POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
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