SN54HC74, SN74HC74
DUAL D-TYPE POSITIVE-EDGE-TRIGGERED FLIP-FLOPS
WITH CLEAR AND PRESET
SCLS094D – DECEMBER 1982 – REVISED JULY 2003
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Wide Operating Voltage Range of 2 V to 6 V
Outputs Can Drive Up To 10 LSTTL Loads
Low Power Consumption, 40-µA Max I
CC
Typical t
pd
= 15 ns
±4-mA Output Drive at 5 V
Low Input Current of 1 µA Max
description/ordering information
The ’HC74 devices contain two independent
D-type positive-edge-triggered flip-flops. A low
level at the preset (PRE
) or clear (CLR) inputs sets
or resets the outputs, regardless of the levels of
the other inputs. When PRE
and CLR are inactive
(high), data at the data (D) input meeting the setup
time requirements are transferred to the outputs
on the positive-going edge of the clock (CLK)
pulse. Clock triggering occurs at a voltage level
and is not directly related to the rise time of CLK.
Following the hold-time interval, data at the
D input can be changed without affecting the
levels at the outputs.
ORDERING INFORMATION
T
A
PACKAGE
†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP – N T ube of 25 SN74HC74N SN74HC74N
T ube of 50 SN74HC74D
SOIC – D
Reel of 2500 SN74HC74DR
HC74
Reel of 250 SN74HC74DT
–40°C to 85°C
SOP – NS Reel of 2000 SN74HC74NSR HC74
SSOP – DB Reel of 2000 SN74HC74DBR HC74
T ube of 90 SN74HC74PW
TSSOP – PW
Reel of 2000 SN74HC74PWR
HC74
Reel of 250 SN74HC74PWT
CDIP – J T ube of 25 SNJ54HC74J SNJ54HC74J
–55°C to 125°C
CFP – W T ube of 150 SNJ54HC74W SNJ54HC74W
LCCC – FK T ube of 55 SNJ54HC74FK SNJ54HC74FK
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
1
2
3
4
5
6
7
14
13
12
11
10
9
8
1CLR
1D
1CLK
1PRE
1Q
1Q
GND
V
CC
2CLR
2D
2CLK
2PRE
2Q
2Q
SN54HC74 ...J OR W PACKAGE
SN74HC74 . . . D, DB, N, NS, OR PW PACKAGE
(TOP VIEW)
3212019
910111213
4
5
6
7
8
18
17
16
15
14
2D
NC
2CLK
NC
2PRE
1CLK
NC
1PRE
NC
1Q
1D
1CLR
NC
2Q
2Q
V
2CLR
1Q
GND
NC
SN54HC74 . . . FK PACKAGE
(TOP VIEW)
CC
NC – No internal connection
Copyright 2003, Texas Instruments Incorporated
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.
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
