CD54AC74, CD74AC74
DUAL POSITIVE-EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH CLEAR AND PRESET
SCHS231D – SEPTEMBER 1998 – REVISED DECEMBER 2002
CD54AC74 . . . F PACKAGE
CD74AC74 . . . E OR M PACKAGE
(TOP VIEW)
AC Types Feature 1.5-V to 5.5-V Operation
and Balanced Noise Immunity at 30% of the
Supply
Speed of Bipolar F, AS, and S, With
Significantly Reduced Power Consumption
1CLR
1D
V
CC
2CLR
2D
1
2
3
4
5
6
7
14
13
12
11
Balanced Propagation Delays
1CLK
1PRE
1Q
±24-mA Output Drive Current
– Fanout to 15 F Devices
2CLK
10 2PRE
9
8
1Q
2Q
2Q
SCR-Latchup-Resistant CMOS Process and
Circuit Design
GND
Exceeds 2-kV ESD Protection Per
MIL-STD-883, Method 3015
description/ordering information
The ’AC74 dual positive-edge-triggered devices are D-type 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 is transferred to the outputs on the positive-going edge of the clock pulse. Clock triggering occurs
at a voltage level and is not related directly to the rise time of the clock pulse. Following the hold-time interval,
data at the D input can be changed without affecting the levels at the outputs.
ORDERING INFORMATION
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
†
PACKAGE
T
A
PDIP – E
SOIC – M
CDIP – F
Tube
Tube
CD74AC74E
CD74AC74M
CD74AC74E
–55°C to 125°C
AC74M
Tape and reel CD74AC74M96
Tube CD54AC74F3A
CD54AC74F3A
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines
are available at www.ti.com/sc/package.
FUNCTION TABLE
(each flip-flop)
INPUTS
OUTPUTS
PRE
L
CLR
CLK
X
D
X
X
X
H
L
Q
H
L
Q
L
H
L
H
X
H
‡
‡
H
L
L
X
H
H
H
H
H
↑
H
L
L
H
↑
H
H
L
X
Q
Q
0
0
‡
This configuration is nonstable; that is, it does not
persist when PRE or CLR returns to its inactive
(high) level.
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 2002, Texas Instruments Incorporated
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.
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.
1
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