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Teilenummer | 54ACT74 |
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Beschreibung | Dual D-Type Positive Edge-Triggered Flip-Flop | |
Hersteller | National Semiconductor | |
Logo | ||
Gesamt 8 Seiten 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
AC Electrical Characteristics (Continued)
Note 10: Voltage Range 5.0 is 5.0V ±0.5V
AC Operating Requirements
Symbol
Parameter
ts Set-up Time, HIGH or
LOW
Dn to CPn
th Hold Time, HIGH or
LOW
Dn to CPn
tw CPn or CDn or SDn
Pulse Width
trec Recovery Time
CDn or SDn to CP
Note 11: Voltage Range 5.0 is 5.0V ±0.5V
VCC
(V)
(Note 11)
5.0
5.0
5.0
5.0
54ACT
TA =
−55˚C
CL = 50
pF
Guaranteed
Limits
4.0
1.0
7.0
0.5
Units
ns
ns
ns
ns
Capacitance
Symbol
CIN
CPD
Parameter
Input Capacitance
Power Dissipation
Capacitance
Typ
4.5
35.0
Units
pF
pF
Conditions
VCC = OPEN
VCC = 5.0V
Fig.
No.
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6 Page | ||
Seiten | Gesamt 8 Seiten | |
PDF Download | [ 54ACT74 Schematic.PDF ] |
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