Datasheet

December 1990 6
Philips Semiconductors Product specification
Dual decade ripple counter 74HC/HCT390
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications” .
Output capability: standard
I
CC
category: MSI
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
=50pF
INPUT UNIT LOAD COEFFICIENT
nCP
0
nCP
1
, nMR
0.45
0.60
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
0
to nQ
0
21 34 43 51 ns 4.5 Fig.6
t
PHL
/ t
PLH
propagation delay
nCP
1
to nQ
1
22 38 48 57 ns 4.5 Fig.6
t
PHL
/ t
PLH
propagation delay
nCP
1
to nQ
2
30 51 64 77 ns 4.5 Fig.6
t
PHL
/ t
PLH
propagation delay
nCP
1
to nQ
3
22 38 48 57 ns 4.5 Fig.6
t
PHL
propagation delay
nMR to nQ
n
21 36 45 54 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
nCP
0
, nCP
1
18 8 23 27 ns 4.5 Fig.6
t
W
master reset pulse width
HIGH
17 10 21 26 ns 4.5 Fig.7
t
rem
removal time
nMR to nCP
n
15 8 19 22 ns 4.5 Fig.7
f
max
maximum clock pulse
frequency
nCP
0
, nCP
1
27 55 22 18 MHz 4.5 Fig.6