SN54HCT273, SN74HCT273
OCTAL DĆTYPE FLIPĆFLOPS
WITH CLEAR
SCLS068E − NOVEMBER 1988 − REVISED AUGUST 2003
Operating Voltage Range of 4.5 V to 5.5 V
Outputs Can Drive Up To 10 LSTTL Loads
Low Power Consumption, 80-µA Max ICC
Typical tpd = 12 ns
±4-mA Output Drive at 5 V
Low Input Current of 1 µA Max
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
SN54HCT273 . . . FK PACKAGE
(TOP VIEW)
VCC
8Q
8D
7D
7Q
6Q
6D
5D
5Q
CLK
2D
2Q
3Q
3D
4D
4
3 2 1 20 19
18
5
17
6
16
7
15
8
14
9 10 11 12 13
8D
7D
7Q
6Q
6D
4Q
GND
CLK
5Q
5D
CLR
1Q
1D
2D
2Q
3Q
3D
4D
4Q
GND
Inputs Are TTL-Voltage Compatible
Contain Eight D-Type Flip-Flops
Direct Clear Input
Applications Include:
− Buffer/Storage Registers
− Shift Registers
− Pattern Generators
1D
1Q
CLR
VCC
SN54HCT273 . . . J OR W PACKAGE
SN74HCT273 . . . DB, DW, N, NS, OR PW PACKAGE
(TOP VIEW)
D
D
D
D
8Q
D
D
D
D
D
D
description/ordering information
These devices are positive-edge-triggered D-type flip-flops with a common enable input. The ’HCT273 devices
are similar to the ’HCT377 devices, but feature a common clear enable (CLR) input instead of a latched clock.
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.
ORDERING INFORMATION
PACKAGE†
TA
PDIP − N
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
Tube of 20
SN74HCT273N
Tube of 25
SN74HCT273DW
Reel of 2000
SN74HCT273DWR
SOP − NS
Reel of 2000
SN74HCT273NSR
HCT273
SSOP − DB
Reel of 2000
SN74HCT273DBR
HT273
Tube of 70
SN74HCT273PW
Reel of 2000
SN74HCT273PWR
Reel of 250
SN74HCT273PWT
CDIP − J
Tube of 20
SNJ54HCT273J
SNJ54HCT273J
CFP − W
Tube of 85
SNJ54HCT273W
SNJ54HCT273W
LCCC − FK
Tube of 55
SNJ54HCT273FK
SOIC − DW
−40°C to 85°C
TSSOP − PW
−55 C 125°C
−55°C to 125 C
SN74HCT273N
HCT273
HT273
SNJ54HCT273FK
† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
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 2003, 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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
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