SN54ALS874B, SN74ALS874B, SN74ALS876A
SN74AS874, SN74AS876
DUAL 4-BIT D-TYPE EDGE-TRIGGERED FLIP-FLOPS
SDAS061C – APRIL 1982 – REVISED JANUARY 1995
SN54ALS874B . . . JT PACKAGE
SN74ALS874B, SN74AS874 . . . DW OR NT PACKAGE
(TOP VIEW)
• 3-State Buffer-Type Outputs Drive Bus
Lines Directly
• Bus-Structured Pinout
1
24
23
22
21
20
19
18
17
16
15
14
13
1CLR
1OE
1D1
1D2
1D3
1D4
2D1
2D2
2D3
2D4
2OE
GND
V
CC
• Choice of True or Inverting Logic
– SN54ALS874B, SN74ALS874B,
SN74AS874 Have True Outputs
– SN74ALS876A, SN74AS876 Have
Inverting Outputs
2
1CLK
1Q1
1Q2
1Q3
1Q4
2Q1
2Q2
2Q3
2Q4
2CLK
2CLR
3
4
5
6
• Asynchronous Clear
7
• Package Options Include Plastic
Small-Outline (DW) Packages, Plastic (FN)
and Ceramic (FK) Chip Carriers, and
Standard Plastic (NT) and Ceramic (JT)
300-mil DIPs
8
9
10
11
12
description
SN54ALS874B . . . FK PACKAGE
(TOP VIEW)
These dual 4-bit D-type edge-triggered flip-flops
feature 3-state outputs designed specifically as
bus drivers. They are particularly suitable for
implementing buffer registers, I/O ports,
bidirectional bus drivers, and working registers.
4
3
2 1 28 27 26
25
1Q2
1D2
1D3
1D4
NC
2D1
2D2
2D3
5
6
7
8
9
The edge-triggered flip-flops enter data on the
low-to-high transition of the clock (CLK) input.
The SN54ALS874B, SN74ALS874B, and
SN74AS874 have clear (CLR) inputs and
noninverting Q outputs. The SN74ALS876A and
SN74AS876 have preset (PRE) inputs and
inverting Q outputs; taking PRE low causes the
four Q or Q outputs to go low independently of the
clock.
24 1Q3
23 1Q4
NC
22
21
20
19
2Q1
2Q2
2Q3
10
11
12 13 14 15 16 17 18
The SN54ALS874B is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74ALS874B, SN74ALS876A,
SN74AS874, and SN74AS876 devices are
characterized for operation from 0°C to 70°C.
NC – No internal connection
SN74ALS876A, SN74AS876 . . . DW OR NT PACKAGE
(TOP VIEW)
1
24
23
22
21
20
19
18
17
16
15
14
13
1PRE
1OE
1D1
1D2
1D3
1D4
2D1
2D2
2D3
2D4
2OE
GND
V
CC
2
1CLK
1Q1
1Q2
1Q3
1Q4
2Q1
2Q2
2Q3
2Q4
2CLK
2PRE
3
4
5
6
7
8
9
10
11
12
Copyright 1995, Texas Instruments Incorporated
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.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265