Datasheet

December 1990 6
Philips Semiconductors Product specification
Dual 4-bit synchronous binary counter 74HC/HCT4520
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
= 50 pF
INPUT UNIT LOAD COEFFICIENT
nCP
0
, nCP
1
nMR
0.80
1.50
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
n
28 53 66 80 ns 4.5 Fig.8
t
PHL
/ t
PLH
propagation delay
nCP
1
to nQ
n
25 53 66 80 ns 4.5 Fig.8
t
PHL
propagation delay
nMR to nQ
n
16 35 44 53 ns 4.5 Fig.9
t
THL
/ t
TLH
output transition time 7 15 19 22 ns 4.5 Fig.8
t
W
clock pulse width
HIGH or LOW
20 10 25 30 ns 4.5 Fig.7
t
W
master reset pulse width
HIGH
20 12 25 30 ns 4.5 Fig.7
t
rem
removal time
nMR to nCP
0
; nCP
1
0 −8 0 0 ns 4.5 Fig.7
t
su
set-up time
nCP
1
to nCP
0
;
nCP
0
to nCP
1
16 6 20 24 ns 4.5 Fig.8
f
max
maximum clock pulse
frequency
30 58 24 20 MHz 4.5 Fig.7