SN54ALS874B_08 Datasheet, PDF (1/20 Pages) Texas Instruments – DUAL 4-BIT D-TYPE EDGE-TRIGGERED FLIP-FLOPS

SN54ALS874B, SN74ALS874B, SN74ALS876A
SN74AS874, SN74AS876
DUAL 4-BIT D-TYPE EDGE-TRIGGERED FLIP-FLOPS
SDAS061C – APRIL 1982 – REVISED JANUARY 1995
• 3-State Buffer-Type Outputs Drive Bus
Lines Directly
• Bus-Structured Pinout
• Choice of True or Inverting Logic
– SN54ALS874B, SN74ALS874B,
SN74AS874 Have True Outputs
– SN74ALS876A, SN74AS876 Have
Inverting Outputs
• Asynchronous Clear
• 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
SN54ALS874B . . . JT PACKAGE
SN74ALS874B, SN74AS874 . . . DW OR NT PACKAGE
(TOP VIEW)
1CLR 1
1OE 2
1D1 3
1D2 4
1D3 5
1D4 6
2D1 7
2D2 8
2D3 9
2D4 ¹⁰
2OE ¹¹
GND ¹²
24 V_CC
23 1CLK
22 1Q1
21 1Q2
20 1Q3
19 1Q4
18 2Q1
17 2Q2
16 2Q3
15 2Q4
14 2CLK
13 2CLR
description
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.
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.
SN54ALS874B . . . FK PACKAGE
(TOP VIEW)
4 3 2 1 28 27 26
1D2 5
25 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
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)
1PRE 1
1OE 2
1D1 3
1D2 4
1D3 5
1D4 6
2D1 7
2D2 8
2D3 9
2D4 ¹⁰
2OE ¹¹
GND ¹²
24 V_CC
23 1CLK
22 1Q1
21 1Q2
20 1Q3
19 1Q4
18 2Q1
17 2Q2
16 2Q3
15 2Q4
14 2CLK
13 2PRE
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.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright © 1995, Texas Instruments Incorporated
1