SN54HCT273, SN74HCT273
OCTAL D-TYPE FLIP-FLOPS
WITH CLEAR
SCLS068C – NOVEMBER 1988 – REVISED MAY 1997
SN54HCT273 . . . J OR W PACKAGE
SN74HCT273 . . . DW, N, OR PW PACKAGE
(TOP VIEW)
Inputs Are TTL-Voltage Compatible
Contain Eight D-Type Flip-Flops
Direct Clear Input
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
CLR
1Q
1D
2D
2Q
3Q
3D
4D
4Q
V
CC
Applications Include:
– Buffer/Storage Registers
– Shift Registers
8Q
8D
7D
7Q
6Q
6D
5D
5Q
CLK
– Pattern Generators
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
GND
description
SN54HCT273 . . . FK PACKAGE
(TOP VIEW)
Thesedevicesarepositive-edge-triggeredD-type
flip-flops with a common enable input. The
’HCT273 are similar to the ’HCT377, but feature
a common clear enable (CLR) input instead of a
latched clock.
3
2
1
20 19
18
4
5
6
7
8
2D
2Q
3Q
3D
4D
8D
7D
7Q
6Q
6D
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. Clock triggering occurs at a
particular voltage level and is not directly related
to the positive-going pulse. When CLK is at either
the high or low level, the D input has no effect at
the output. The circuits are designed to prevent
false clocking by transitions at CLR.
17
16
15
14
9 10 11 12 13
The SN54HCT273 is characterized for operation over the full military temperature range of –55°C to 125°C. The
SN74HCT273 is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
(each flip-flop)
INPUTS
OUTPUT
Q
CLR
L
CLK
D
X
H
L
X
↑
L
H
L
H
H
↑
H
L
X
Q
0
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.
Copyright 1997, Texas Instruments Incorporated
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information 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
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