Datasheet

December 1990 9
Philips Semiconductors Product specification
4-bit bidirectional universal shift register 74HC/HCT194
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t
r
=t
f
= 6 ns; C
L
= 50 pF
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
CP to Q
n
18 32 40 48 ns 4.5 Fig.7
t
PHL
propagation delay
MR to Q
n
18 32 40 48 ns 4.5 Fig.8
t
THL
/ t
TLH
output transition time 7 15 19 22 ns 4.5 Fig.7
t
W
clock pulse width
HIGH or LOW
16 7 20 24 ns 4.5 Fig.7
t
W
master reset pulse
width; LOW
16 7 20 24 ns 4.5 Fig.8
t
rem
removal time
MR to CP
12 6 15 18 ns 4.5 Fig.8
t
su
set-up time
D
n
to CP
14 7 18 21 ns 4.5 Fig.9
t
su
set-up time
S
0
, S
1
to CP
20 10 25 30 ns 4.5 Fig.10
t
su
set-up time
D
SR
, D
SL
to CP
14 18 21 ns 4.5 Fig.9
t
h
hold time
D
n
to CP
0 −7 0 0 ns 4.5 Fig.9
t
h
hold time
S
0
, S
1
to CP
0 −5 0 0 ns 4.5 Fig.10
t
h
hold time
D
SR
, D
SL
to CP
0 −7 0 0 ns 4.5 Fig.9
f
max
maximum clock pulse
frequency
30 70 24 20 MHz 4.5 Fig.7