Datasheet

1998 Feb 23 6
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
I
CC
category: flip-flops
Note to HCT types
The value of additional quiescent supply current (∆I
CC
) for a unit load of 1 is given in the family specifications.
To determine ∆I
CC
per input, multiply this value by the unit load coefficient shown in the table below.
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t
r
= t
f
= 6 ns; C
L
= 50 pF
INPUT UNIT LOAD COEFFICIENT
nD 0.70
nR
D
0.70
n
S
D
0.80
nCP 0.80
SYMBOL PARAMETER
T
amb
(°C)
UNIT
TEST CONDITIONS
74HCT
V
CC
(V)
WAVEFORMS+25 −40 to +85 −40 to +125
min. typ. max. min. max. min. max.
t
PHL
/ t
PLH
propagation delay
nCP to nQ, nQ
18 35 44 53 ns 4.5 Fig.6
t
PHL
/ t
PLH
propagation delay
nS
D
to nQ, nQ
23 40 50 60 ns 4.5 Fig.7
t
PHL
/ t
PLH
propagation delay
nR
D
to nQ, nQ
24 40 50 60 ns 4.5 Fig.7
t
THL
/ t
TLH
output transition time 7 15 19 22 ns 4.5 Fig.6
t
W
clock pulse width
HIGH or LOW
18 9 23 27 ns 4.5 Fig.6
t
W
set or reset pulse width
LOW
16 9 20 24 ns 4.5 Fig.7
t
rem
removal time
set or reset
6 1 8 9 ns 4.5 Fig.7
t
su
set-up time
nD to nCP
12 5 15 18 ns 4.5 Fig.6
t
h
hold time
nCP to nD
3 −3 3 3 ns 4.5 Fig.6
f
max
maximum clock pulse
frequency
27 54 22 18 MHz 4.5 Fig.6