December 1990 11
Philips Semiconductors Product specification
Presettable synchronous 4-bit binary
up/down counter
74HC/HCT191
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
74HC
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
26 48 60 72 ns 4.5 Fig.10
t
PHL
/ t
PLH
propagation delay
CP to TC
32 51 64 77 ns 4.5 Fig.10
t
PHL
/ t
PLH
propagation delay
CP to RC
19 35 44 53 ns 4.5 Fig.11
t
PHL
/ t
PLH
propagation delay
CE to RC
19 33 41 50 ns 4.5 Fig.11
t
PHL
/ t
PLH
propagation delay
D
n
to Q
n
22 44 55 66 ns 4.5 Fig.12
t
PHL
/ t
PLH
propagation delay
PL to Q
n
27 46 58 69 ns 4.5 Fig.13
t
PHL
/ t
PLH
propagation delay
U/D to TC
23 45 56 68 ns 4.5 Fig.14
t
PHL
/ t
PLH
propagation delay
U/D to RC
24 45 56 68 ns 4.5 Fig.14
t
THL
/ t
TLH
output transition time 7 15 19 22 ns 4.5 Fig.15
t
W
clock pulse width
HIGH or LOW
16 9 20 24 ns 4.5 Fig.10
t
W
parallel load pulse width
LOW
22 11 28 33 ns 4.5 Fig.15
t
rem
removal time
PL to CP
7 1 9 11 ns 4.5 Fig.15
t
su
set-up time
U/D to CP
41 20 51 62 ns 4.5 Fig.17
t
su
set-up time
D
n
to PL
20 9 25 30 ns 4.5 Fig.16
t
su
set-up time
CE to CP
30 18 38 45 ns 4.5 Fig.17
t
h
hold time
U/D to CP
0 −18 0 0 ns 4.5 Fig.17
t
h
hold time
D
n
to PL
0 −5 0 0 ns 4.5 Fig.16
t
h
hold time
CE to CP
0 −10 0 0 ns 4.5 Fig.17
f
max
maximum clock pulse
frequency
20 33 16 13 MHz 4.5 Fig.10
