SN54ABT377, SN74ABT377
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH CLOCK ENABLE
SCBS156B – FEBRUARY 1991 – REVISED JULY 1994
SN54ABT377 . . . J PACKAGE
SN74ABT377 . . . DB, DW, OR N PACKAGE
(TOP VIEW)
• State-of-the-Art EPIC-ΙΙB BiCMOS Design
Significantly Reduces Power Dissipation
• Latch-Up Performance Exceeds 500 mA
Per JEDEC Standard JESD-17
CLKEN
1Q
V
CC
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
• Typical V
(Output Ground Bounce)
8Q
8D
7D
7Q
6Q
6D
OLP
CC
< 1 V at V
= 5 V, T = 25°C
1D
2D
2Q
3Q
A
• High-Drive Outputs (–32-mA I
,
OH
64-mA I
)
OL
• Package Options Include Plastic
3D
Small-Outline (DW) and Shrink
4D
4Q
13 5D
12 5Q
Small-Outline (DB) Packages, Ceramic
Chip Carriers (FK), and Plastic (N) and
Ceramic (J) DIPs
11
GND
CLK
description
SN54ABT377 . . . FK PACKAGE
(TOP VIEW)
The ′ABT377 are 8-bit positive-edge-triggered
D-type flip-flops with a clock (CLK) input. They are
particularly suitable for implementing buffer and
storage registers, shift registers, and pattern
generators.
3
2
1
20 19
18 8D
2D
2Q
3Q
3D
4D
4
5
6
7
8
Data (D) input information that meets the setup
time requirements is transferred to the Q outputs
on the positive-going edge of the clock pulse if the
commonclock-enable(CLKEN)inputislow. Clock
triggering occurs at a particular voltage level and
is not directly related to the transition time of the
positive-going pulse. When the buffered clock
(CLK) input is at either the high or low level, the
D input signal has no effect at the output. The
circuits are designed to prevent false clocking by
transitions at CLKEN.
17
16
15
14
7D
7Q
6Q
6D
9 10 11 12 13
The SN74ABT377 is available in TI’s shrink small-outline package (DB), which provides the same I/O pin count
and functionality of standard small-outline packages in less than half the printed-circuit-board area.
The SN54ABT377 is characterized for operation over the full military temperature range of –55°C to 125°C. The
SN74ABT377 is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
(each flip-flop)
INPUTS
OUTPUT
Q
CLKEN CLK
D
X
H
L
H
L
X
Q
0
↑
↑
H
L
L
X
H or L
X
Q
0
EPIC-ΙΙB is a trademark of Texas Instruments Incorporated.
Copyright 1994, 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.
2–1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265