Dual JK ﬂip-ﬂop with reset; negative-edge trigger
• Output capability: standard
• ICC category: flip-flops
The 74HC/HCT107 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/HCT107 are dual negative-edge triggered
JK-type flip-flops featuring individual J, K, clock (nCP) and
reset (nR) inputs; also complementary Q and Q outputs.
The J and K inputs must be stable one set-up time prior to
the HIGH-to-LOW clock transition for predictable
The reset (nR) is an asynchronous active LOW input.
When LOW, it overrides the clock and data inputs, forcing
the Q output LOW and the Q output HIGH.
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
nCP to nQ
nCP to nQ
nR to nQ, nQ
maximum clock frequency
capacitance per ﬂip-ﬂop
CL = 15 pF;
VCC = 5 V
notes 1 and 2
1. CPD is used to determine the dynamic power dissipation (PD in µW):
PD = CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where:
fi = input frequency in MHz
fo = output frequency in MHz
∑ (CL × VCC2 × fo) = sum of outputs
CL = output load capacitance in pF
VCC = supply voltage in V
2. For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC − 1.5 V.
16 16 ns
16 18 ns
16 17 ns
78 73 MHz
3.5 3.5 pF
30 30 pF
See “74HC/HCT/HCU/HCMOS Logic Package Information”.