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© 2000 Fairchild Semiconductor Corporation
DS006373
www.fairchildsemi.com
August 1986
Revised March 2000
DM74LS74A
Dual Positive-Edge-Triggered D Flip-Flops with
Preset, Clear and Complementary Outputs
General Description
This device contains two independent positive-edge-trig-
gered D flip-flops with complementary outputs. The infor-
mation on the D input is accepted by the flip-flops on the
positive going edge of the clock pulse. The triggering
occurs at a voltage level and is not directly related to the
transition time of the rising edge of the clock. The data on
the D input may be changed while the clock is LOW or
HIGH without affecting the outputs as long as the data
setup and hold times are not violated. A low logic level on
the preset or clear inputs will set or reset the outputs
regardless of the logic levels of the other inputs.
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
H
= HIGH Logic Level
X
= Either LOW or HIGH Logic Level
L
= LOW Logic Level
↑ = Positive-going Transition
Q0 = The output logic level of Q before the indicated input conditions were
established.
Note 1: This configuration is nonstable; that is, it will not persist when either
the preset and/or clear inputs return to their inactive (HIGH) level.
Order Number
Package Number
Package Description
DM74LS74AM
M14A
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
DM74LS85ASJ
M14D
14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74LS74AN
N14A
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Inputs
Outputs
PR
CLR
CLK
D
Q
Q
LH
X
X
H
L
HL
X
X
L
H
L
L
X
X
H (Note 1) H (Note 1)
HH
HH
L
HH
LL
H
HH
L
X
Q0
Q0


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