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74HC74D-74HCT74D-74HCT74DB-74HCT74N
Dual D-type flip-flop with set and reset; positive-edge trigger

Philips Semiconductors Product specification
Dual D-type flip-flop with set and reset;
positive-edge trigger 74HC/HCT74
FEATURES
Output capability: standard ICC category: flip-flops
GENERAL DESCRIPTION

The 74HC/HCT74 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT74 are dual positive-edge triggered, D-type
flip-flops with individual data (D) inputs, clock (CP) inputs,
set (SD) and reset (RD) inputs; also complementary Q and
Q outputs.
The set and reset are asynchronous active LOW inputs
and operate independently of the clock input. Information
on the data input is transferred to the Q output on the
LOW-to-HIGH transition of the clock pulse. The D inputs
must be stable one set-up time prior to the LOW-to-HIGH
clock transition for predictable operation.
Schmitt-trigger action in the clock input makes the circuit
highly tolerant to slower clock rise and fall times.
QUICK REFERENCE DATA

GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
Notes
CPD is used to determine the dynamic power dissipation (PDin μW): = CPD× VCC2×fi +∑ (CL× VCC2×fo) where: = input frequency in MHz = output frequency in MHz (CL× VCC2×fo) = sum of outputs= output load capacitance in pF
VCC= supply voltage in V For HC the condition is VI= GND to VCC
For HCT the condition is VI= GND to VCC− 1.5 V
Philips Semiconductors Product specification
Dual D-type flip-flop with set and reset;
positive-edge trigger 74HC/HCT74
ORDERING INFORMATION
PIN DESCRIPTION
Philips Semiconductors Product specification
Dual D-type flip-flop with set and reset;
positive-edge trigger 74HC/HCT74
FUNCTION TABLE
Note
H = HIGH voltage level
L = LOW voltage level
X = don’t care = LOW-to-HIGH CP transition
Qn+1= state after the next LOW-to-HIGH CP transition
Philips Semiconductors Product specification
Dual D-type flip-flop with set and reset;
positive-edge trigger 74HC/HCT74
DC CHARACTERISTICS FOR 74HC

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
ICC category: flip-flops
AC CHARACTERISTICS

GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Philips Semiconductors Product specification
Dual D-type flip-flop with set and reset;
positive-edge trigger 74HC/HCT74
DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
ICC category: flip-flops
Note to HCT types

The value of additional quiescent supply current (ΔICC) for a unit load of 1 is given in the family specifications.
To determine ΔICC per input, multiply this value by the unit load coefficient shown in the table below.
AC CHARACTERISTICS FOR 74HCT

GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Philips Semiconductors Product specification
Dual D-type flip-flop with set and reset;
positive-edge trigger 74HC/HCT74
AC WAVEFORMS
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