54AC74 반도체 회로 부품 판매점
Dual D-Type Positive Edge-Triggered Flip-Flop
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 National Semiconductor |
www.DataSheet4U.com
August 1998
54AC74 • 54ACT74
Dual D-Type Positive Edge-Triggered Flip-Flop
General Description
The ’AC/’ACT74 is a dual D-type flip-flop with Asynchronous
Clear and Set inputs and complementary (Q, Q) outputs. In-
formation at the input is transferred to the outputs on the
positive 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. After the Clock
Pulse input threshold voltage has been passed, the Data in-
put is locked out and information present will not be trans-
ferred to the outputs until the next rising edge of the Clock
Pulse input.
Asynchronous Inputs:
LOW input to SD (Set) sets Q to HIGH level
LOW input to CD (Clear) sets Q to LOW level
Clear and Set are independent of clock
Simultaneous LOW on CD and SD makes both Q and Q
HIGH
Features
n ICC reduced by 50%
n Output source/sink 24 mA
n ’ACT74 has TTL-compatible inputs
n Standard Microcircuit Drawing (SMD)
— ’AC74: 5962-88520
— ’ACT74: 5962-87525
Logic Symbols
DS100266-1
IEEE/IEC
Pin Names
D1, D2
CP1, CP2
CD1, CD2
SD1, SD2
Q1, Q1, Q2, Q2
DS100266-2
Description
Data Inputs
Clock Pulse Inputs
Direct Clear Inputs
Direct Set Inputs
Outputs
DS100266-3
FACT® is a registered trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100266
www.national.com
Connection Diagrams
Pin Assignment for DIP
and Flatpak
Pin Assignment for LCC
DS100266-4
Truth Table
(Each Half)
Inputs
SD CD CP D
L H XX
Outputs
QQ
HL
H L XXL H
L
L
XXH
H
H H NH H L
H H NL L H
H H L X Q0 Q0
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
N = LOW-to-HIGH Clock Transition
Q0(Q0) = Previous Q(Q) before LOW-to-HIGH Transition of Clock
Logic Diagram
DS100266-5
DS100266-6
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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54AC74 flip-flop
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관련 데이터시트
54AC74
Dual D-Type Positive Edge-Triggered Flip-Flop - National Semiconductor
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