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SN74LS74AD Datasheet PDF : 7 Pages
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SN74LS74A
Dual D−Type Positive
Edge−Triggered Flip−Flop
The SN74LS74A dual edge-triggered flip-flop utilizes Schottky
TTL circuitry to produce high speed D-type flip-flops. Each flip-flop
has individual clear and set inputs, and also complementary Q and Q
outputs.
Information at input D is transferred to the Q output on the
positive-going edge of the clock pulse. Clock triggering occurs at a
voltage level of the clock pulse and is not directly related to the
transition time of the positive-going pulse. When the clock input is at
either the HIGH or the LOW level, the D input signal has no effect.
http://onsemi.com
LOW
POWER
SCHOTTKY
MODE SELECT − TRUTH TABLE
OPERATING MODE
INPUTS
SD
CD
D
OUTPUTS
Q
Q
Set
Reset (Clear)
*Undetermined
Load “1” (Set)
Load “0” (Reset)
L
H
X
H
L
H
L
X
L
H
L
L
X
H
H
H
H
h
H
L
H
H
l
L
H
* Both outputs will be HIGH while both SD and CD are LOW, but the output
states are unpredictable if SD and CD go HIGH simultaneously. If the levels
at the set and clear are near VIL maximum then we cannot guarantee to meet
the minimum level for VOH.
H, h = HIGH Voltage Level
L, I = LOW Voltage Level
X = Don’t Care
l, h (q) = Lower case letters indicate the state of the referenced input
i, h (q) = (or output) one set-up time prior to the HIGH to LOW clock transition.
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min Typ Max Unit
VCC
Supply Voltage
TA
Operating Ambient
Temperature Range
4.75 5.0 5.25
V
0
25
70
°C
IOH
Output Current − High
IOL
Output Current − Low
−0.4 mA
8.0
mA
14
1
PLASTIC
N SUFFIX
CASE 646
14
1
SOIC
D SUFFIX
CASE 751A
14
1
SOEIAJ
M SUFFIX
CASE 965
ORDERING INFORMATION
Device
Package
Shipping
SN74LS74AN
14 Pin DIP 2000 Units/Box
SN74LS74AD
SOIC−14
55 Units/Rail
SN74LS74ADR2 SOIC−14 2500/Tape & Reel
SN74LS74AM
SOEIAJ−14 See Note 1
SN74LS74AMEL SOEIAJ−14 See Note 1
1. For ordering information on the EIAJ version of
the SOIC package, please contact your local
ON Semiconductor representative.
© Semiconductor Components Industries, LLC, 2006
1
July, 2006 − Rev. 8
Publication Order Number:
SN74LS74A/D
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