Semiconductor Components Industries, LLC, 2001
May, 2001 – Rev. 5 1Publication Order Number:
MC74AC74/D
MC74AC74, MC74ACT74
Dual D-Type Positive
Edge-Triggered Flip-Flop
The MC74AC74/74ACT74 is a dual D–type flip–flop with
Asynchronous Clear and Set inputs and complementary (Q,Q)
outputs. Information 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 input is locked out and
information present will not be transferred 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
•Outputs Source/Sink 24 mA
•′ACT74 Has TTL Compatible Inputs
CP1CD2
CP2
1314 12 11 10 9 8
21 34567
VCC
CD1 D1CP1SD1 Q1Q1
CD2 D2CP2SD2 Q2Q2
CD1
SD1
Q1
D1
SD2Q2
Q2
D2
GND
Q1
Figure 1. Pinout: 14–Lead Packages Conductors
(Top V iew)
PIN ASSIGNMENT
PIN FUNCTION
D1, D2Data Inputs
CP1, CP2Clock Pulse Inputs
CD1, CD2 Direct Clear Inputs
SD1, SD2 Direct Set Inputs
Q1, Q 1, Q2, Q2Outputs
TSSOP–14
DT SUFFIX
CASE 948G
1
14
EIAJ–14
M SUFFIX
CASE 965
1
14
SO–14
D SUFFIX
CASE 751A
http://onsemi.com
1
14
1
14
PDIP–14
N SUFFIX
CASE 646
Device Package Shipping
ORDERING INFORMATION
MC74AC74DT TSSOP–14 96 Units/Rail
MC74AC74DTR2 TSSOP–14 2500 Tape & Reel
MC74ACT74DT TSSOP–14 96 Units/Rail
MC74ACT74DTR2 TSSOP–14 2500 Tape & Reel
MC74AC74N PDIP–14 25 Units/Rail
MC74AC74D SOIC–14 55 Units/Rail
MC74ACT74N PDIP–14 25 Units/Rail
MC74AC74DR2 SOIC–14 2500 Tape & Reel
MC74ACT74D SOIC–14 55 Units/Rail
MC74ACT74DR2 SOIC–14 2500 Tape & Reel
MC74AC74M EIAJ–14 50 Units/Rail
MC74AC74MEL EIAJ–14 2000 Tape & Reel
MC74ACT74M EIAJ–14 50 Units/Rail
MC74ACT74MEL EIAJ–14 2000 Tape & Reel
See general marking information in the device marking
section on page 7 of this data sheet.
DEVICE MARKING INFORMATION