FEATURES
• Output capability: standard
• ICC category: flip-flop
GENERAL DESCRIPTION
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
operation.
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
| SYMBOL |
PARAMETER |
CONDITIONS |
TYPICAL |
UNIT |
| HC |
HCT |
| tPHL/ tPLH |
propagation delay
nCP to nQ
nCP to nQ
nR to nQ, nQ
|
CL = 15 pF;
VCC = 5 V
|
16
16
16
|
16
18
17
|
ns
ns
ns
|
| fmax |
maximum clock frequency |
78 |
73 |
MHz |
| CI |
input capacitance |
|
3.5 |
3.5 |
pF |
| CPD |
power dissipation capacitance per flip-flop |
notes 1 and 2 |
30 |
30 |
pF |
Notes
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.
PIN DESCRIPTION
| PIN NO. |
SYMBOL |
NAME AND FUNCTION |
|
1, 8, 4, 11
2, 6
3, 5
7
12, 9
13, 10
14
|
1J, 2J, 1K, 2K
1Q, 2Q
1Q, 2Q
GND
1CP, 2CP
1R, 2R
VCC
|
synchronous inputs; flip-flops 1 and 2
complement flip-flop outputs
true flip-flop outputs
ground (0 V)
clock input (HIGH-to-LOW, edge-triggered)
asynchronous reset inputs (active LOW)
positive supply voltage
|
Product Tags:
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Dual JK flip-flop with reset , negative - edge trigger 74HC107N,652 Images
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