Texas Instruments SN54HC377J, SN74HC377DW, SN74HC377DWR, SN74HC377N, SNJ54HC377FK Datasheet
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SN54HC377, SN74HC377
OCTAL D-TYPE FLIP-FLOPS
WITH CLOCK ENABLE
SCLS307A – JANUARY 1996 – REVISED MA Y 1997
D
Eight Flip-Flops With Single-Rail Outputs
D
Clock Enable Latched to Avoid False
Clocking
D
Applications Include:
– Buffer/Storage Registers
– Shift Registers
– Pattern Generators
D
Package Options Include Plastic
Small-Outline (DW) and Ceramic Flat (W)
Packages, Ceramic Chip Carriers (FK), and
Standard Plastic (N) and Ceramic (J)
300-mil DIPs
description
These devices are positive-edge-triggered octal
D-type flip-flops with an enable input. The ’HC377
are similar to the ’HC273 but feature a latched
clock-enable (CLKEN) input instead of a common
clear.
Information at the data (D) inputs meeting the
setup time requirements is transferred to the
Q outputs on the positive-going edge of the clock
(CLK) pulse if CLKEN
occurs at a particular voltage level and is not
directly related to the transition time of the
positive-going pulse. When CLK is at either the
high or low level, the D input has no effect at the
output. These devices are designed to prevent
false clocking by transitions at CLKEN
is low. Clock triggering
SN54HC377 ...J OR W PACKAGE
SN74HC377 . . . DW OR N PACKAGE
CLKEN
SN54HC377 . . . FK PACKAGE
2D
2Q
3Q
3D
4D
(TOP VIEW)
1
1Q
2
1D
3
2D
4
2Q
5
3Q
6
3D
7
4D
8
4Q
9
GND
10
(TOP VIEW)
1D1QCLKEN
3212019
4
5
6
7
8
910111213
4Q
GND
20
19
18
17
16
15
14
13
12
11
CLK
CC
V
5Q
V
8Q
8D
7D
7Q
6Q
6D
5D
5Q
CLK
8Q
18
17
16
15
14
5D
CC
8D
7D
7Q
6Q
6D
.
The SN54HC377 is characterized for operation over the full military temperature range of –55°C to 125°C. The
SN74HC377 is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
(each flip-flop)
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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.
INPUTS
CLKEN CLK D
H X X Q
L ↑ HH
L ↑ LL
X L X Q
OUTPUT
Q
0
0
Copyright 1997, Texas Instruments Incorporated
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
1
SN54HC377, SN74HC377
OCTAL D-TYPE FLIP-FLOPS
WITH CLOCK ENABLE
SCLS307A – JANUARY 1996 – REVISED MA Y 1997
logic symbol
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
†
CLKEN
CLK
1D
2D
3D
4D
5D
6D
7D
8D
1
11
3
4
7
8
13
14
17
18
G1
1C2
2D
12
15
16
19
2
1Q
5
2Q
6
3Q
9
4Q
5Q
6Q
7Q
8Q
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic diagram (positive logic)
SN54HC377, SN74HC377
OCTAL D-TYPE FLIP-FLOPS
WITH CLOCK ENABLE
SCLS307A – JANUARY 1996 – REVISED MA Y 1997
CLKEN
CLK
1D
2D
3D
4D
1
11
3
4
7
8
C1
1D
C1
1D
C1
1D
C1
1D
2
1Q
5
2Q
6
3Q
9
4Q
5D
6D
7D
8D
13
14
17
18
1D
1D
1D
1D
C1
C1
C1
C1
12
15
16
19
5Q
6Q
7Q
8Q
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
3
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