Philips Semiconductors
Product specification
Dual JK flip-flop with set and reset;
positive-edge trigger
FEATURES
•
J, K inputs for easy D-type flip-flop
•
Toggle flip-flop or “do nothing” mode
•
Output capability: standard
•
I
CC
category: flip-flops
GENERAL DESCRIPTION
The 74HC/HCT109 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/HCT109 are dual positive-edge triggered, JK
flip-flops with individual J, K inputs, clock (CP) inputs, set
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
°C;
t
r
= t
f
= 6 ns
74HC/HCT109
(S
D
) and reset (R
D
) inputs; also complementary Q and Q
outputs.
The set and reset are asynchronous active LOW inputs
and operate independently of the clock input.
The J and K inputs control the state changes of the
flip-flops as described in the mode select function table.
The J and K inputs must be stable one set-up time prior to
the LOW-to-HIGH clock transition for predictable
operation.
The JK design allows operation as a D-type flip-flop by
tying the J and K inputs together.
Schmitt-trigger action in the clock input makes the circuit
highly tolerant to slower clock rise and fall times.
TYPICAL
SYMBOL
t
PHL
/ t
PLH
PARAMETER
propagation delay
nCP to nQ, nQ
nS
D
to nQ, nQ
nR
D
to nQ, nQ
f
max
C
I
C
PD
Notes
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
µW):
P
D
= C
PD
×
V
CC2
×
f
i
+ ∑
(C
L
×
V
CC2
×
f
o
) where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
∑
(C
L
×
V
CC2
×
f
o
) = sum of outputs
C
L
= output load capacitance in pF
V
CC
= supply voltage in V
2. For HC the condition is V
I
= GND to V
CC
For HCT the condition is V
I
= GND to V
CC
−
1.5 V.
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”.
maximum clock frequency
input capacitance
power dissipation
capacitance per flip-flop
notes 1 and 2
C
L
= 15 pF;
V
CC
= 5 V
15
12
12
75
3.5
20
17
14
15
61
3.5
22
ns
ns
ns
MHz
pF
pF
CONDITIONS
HC
HCT
UNIT
1997 Nov 25
2
PHILIPS [ NXP SEMICONDUCTORS ]
