ꢀꢁꢂ ꢃ ꢄꢅ ꢆ ꢃꢇ ꢀꢁ ꢆꢃ ꢄꢅ ꢆꢃ
ꢈꢉꢄ ꢊ ꢋꢌ ꢀꢍ ꢎ ꢍꢏꢐ ꢑꢐꢈꢒ ꢐꢑꢎ ꢓꢍ ꢒ ꢒꢐ ꢓꢐꢈ ꢈꢑꢎ ꢔꢋ ꢐ ꢕ ꢊꢍ ꢋ ꢑꢕ ꢊꢌ ꢋꢀ
ꢖ ꢍꢎ ꢗ ꢅꢊ ꢐꢄꢓ ꢄꢁꢈ ꢋ ꢓꢐ ꢀ ꢐꢎ
SCAS521F − AUGUST 1995 − REVISED OCTOBER 2003
SN54AC74 . . . J OR W PACKAGE
SN74AC74 . . . D, DB, N, NS, OR PW PACKAGE
(TOP VIEW)
D
D
D
2-V to 6-V V
Operation
CC
Inputs Accept Voltages to 6 V
Max t of 10 ns at 5 V
pd
1CLR
1D
V
CC
13 2CLR
12 2D
1
2
3
4
5
6
7
14
description/ordering information
1CLK
1PRE
1Q
The ’AC74 devices are dual positive-edge-
triggered D-type flip-flops.
11 2CLK
10
9
2PRE
2Q
A low level at the preset (PRE) or clear (CLR) input
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 is transferred to the
outputs on the positive-going edge of the clock
pulse. Clock triggering occurs at a voltage level
and is not directly related to the rise time of the
clock pulse. Following the hold-time interval, data
at D can be changed without affecting the levels
at the outputs.
1Q
8
GND
2Q
SN54AC74 . . . FK PACKAGE
(TOP VIEW)
3
2
1
20 19
18
2D
1CLK
NC
4
5
6
7
8
NC
17
16
15
14
2CLK
NC
1PRE
NC
2PRE
1Q
9 10 11 12 13
NC − No internal connection
ORDERING INFORMATION
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
†
PACKAGE
T
A
PDIP − N
SOIC − D
Tube
SN74AC74N
SN74AC74N
Tube
SN74AC74D
AC74
Tape and reel
Tape and reel
Tape and reel
Tube
SN74AC74DR
SN74AC74NSR
SN74AC74DBR
SN74AC74PW
SN74AC74PWR
SNJ54AC74J
SNJ54AC74W
SNJ54AC74FK
SOP − NS
AC74
AC74
−40°C to 85°C
SSOP − DB
TSSOP − PW
AC74
Tape and reel
Tube
CDIP − J
CFP − W
LCCC − FK
SNJ54AC74J
Tube
SNJ54AC74W
SNJ54AC74FK
−55°C to 125°C
Tube
†
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.
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Copyright 2003, Texas Instruments Incorporated
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