74HC191 Datasheet, PDF (11/14 Pages) NXP Semiconductors – Presettable synchronous 4-bit binary up/down counter

Philips Semiconductors
Presettable synchronous 4-bit binary
up/down counter
Product specification
74HC/HCT191
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t_r = t_f = 6 ns; C_L = 50 pF
T_amb (°C)
TEST CONDITIONS
SYMBOL
PARAMETER
+25
min. typ. max.
74HC
−40 to +85
−40 to +125
UNIT
V_CC
(V)
min. max. min. max.
WAVEFORMS
t_PHL/ t_PLH
t_PHL/ t_PLH
t_PHL/ t_PLH
t_PHL/ t_PLH
t_PHL/ t_PLH
t_PHL/ t_PLH
t_PHL/ t_PLH
t_PHL/ t_PLH
t_THL/ t_TLH
propagation delay
CP to Q_n
propagation delay
CP to TC
propagation delay
CP to RC
propagation delay
CE to RC
propagation delay
D_n to Q_n
propagation delay
PL to Q_n
propagation delay
U/D to TC
propagation delay
U/D to RC
output transition time
26 48
32 51
19 35
19 33
22 44
27 46
23 45
24 45
7 15
60
72 ns 4.5 Fig.10
64
77 ns 4.5 Fig.10
44
53 ns 4.5 Fig.11
41
50 ns 4.5 Fig.11
55
66 ns 4.5 Fig.12
58
69 ns 4.5 Fig.13
56
68 ns 4.5 Fig.14
56
68 ns 4.5 Fig.14
19
22 ns 4.5 Fig.15
t_W
clock pulse width
16 9
20
24
ns 4.5 Fig.10
HIGH or LOW
t_W
parallel load pulse width 22 11
28
33
ns 4.5 Fig.15
LOW
t_rem
removal time
PL to CP
71
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
t_su
set-up time
CE to CP
20 9
25
30 18
38
30
ns 4.5 Fig.16
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
t_h
hold time
CE to CP
0 −5
0
0 −10
0
0
ns 4.5 Fig.16
0
ns 4.5 Fig.17
f_max
maximum clock pulse 20 33
16
13
MHz 4.5 Fig.10
frequency
December 1990
11