ꢀꢁꢂ ꢃ ꢄꢅ ꢆꢇ ꢃ ꢈ ꢀꢁꢇ ꢃꢄ ꢅꢆ ꢇꢃ
ꢉꢊꢄ ꢋ ꢌꢍ ꢀꢎ ꢆ ꢎꢏꢐ ꢑꢐꢉꢒ ꢐꢑꢆ ꢓꢎ ꢒ ꢒꢐ ꢓꢐꢉ ꢉꢑꢆ ꢔꢌ ꢐ ꢕ ꢋꢎ ꢌ ꢑꢕ ꢋꢍ ꢌꢀ
ꢖ ꢎꢆ ꢗ ꢅꢋ ꢐꢄꢓ ꢄꢁꢉ ꢌ ꢓꢐ ꢀ ꢐꢆ
SCAS520H − AUGUST 1995 − REVISED OCTOBER 2003
D
D
4.5-V to 5.5-V V
Operation
D
Max t of 10.5 ns at 5 V
pd
Inputs Are TTL-Voltage Compatible
CC
Inputs Accept Voltages to 5.5 V
D
SN54ACT74 . . . J OR W PACKAGE
SN74ACT74 . . . D, DB, N, NS, OR PW PACKAGE
(TOP VIEW)
SN54ACT74 . . . FK PACKAGE
(TOP VIEW)
1CLR
1D
V
CC
13 2CLR
12 2D
1
2
3
4
5
6
7
14
3
2
1
20 19
18
2D
1CLK
NC
1CLK
1PRE
1Q
4
5
6
7
8
NC
17
16
15
14
11
10
9
2CLK
2PRE
2Q
2CLK
NC
1PRE
NC
1Q
2PRE
1Q
8
GND
2Q
9 10 11 12 13
NC − No internal connection
description/ordering information
The ’ACT74 dual positive-edge-triggered devices are D-type flip-flops.
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.
ORDERING INFORMATION
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
†
PACKAGE
T
A
PDIP − N
SOIC − D
Tube
SN74ACT74N
SN74ACT74N
Tube
SN74ACT74D
ACT74
Tape and reel
Tape and reel
Tape and reel
Tube
SN74ACT74DR
SN74ACT74NSR
SN74ACT74DBR
SN74ACT74PW
SN74ACT74PWR
SNJ54ACT74J
SNJ54ACT74W
SNJ54ACT74FK
SOP − NS
ACT74
AD74
−40°C to 85°C
SSOP − DB
TSSOP − PW
AD74
Tape and reel
Tube
CDIP − J
CFP − W
LCCC − FK
SNJ54ACT74J
SNJ54ACT74W
SNJ54ACT74FK
Tube
−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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