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74HC4520 Datasheet, PDF (6/7 Pages) NXP Semiconductors – Dual 4-bit synchronous binary counter | |||
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Philips Semiconductors
Dual 4-bit synchronous binary counter
Product speciï¬cation
74HC/HCT4520
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see â74HC/HCT/HCU/HCMOS Logic Family Specificationsâ.
Output capability: standard
ICC category: MSI
Note to HCT types
The value of additional quiescent supply current (âICC) for a unit load of 1 is given in the family specifications.
To determine âICC per input, multiply this value by the unit load coefficient shown in the table below.
INPUT
nCP0, nCP1
nMR
UNIT LOAD COEFFICIENT
0.80
1.50
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
SYMBOL
PARAMETER
74HCT
+25
â40 to +85
â40 to +125
UNIT VCC
(V)
WAVEFORMS
min. typ. max. min. max. min. max.
tPHL/ tPLH
tPHL/ tPLH
tPHL
tTHL/ tTLH
propagation delay
nCP0 to nQn
propagation delay
nCP1 to nQn
propagation delay
nMR to nQn
output transition time
28 53
66
25 53
66
16 35
44
7 15
19
80 ns 4.5 Fig.8
80 ns 4.5 Fig.8
53 ns 4.5 Fig.9
22 ns 4.5 Fig.8
tW
clock pulse width
20 10
25
30
HIGH or LOW
tW
master reset pulse width 20 12
25
30
HIGH
trem
removal time
0 â8
0
0
nMR to nCP0; nCP1
tsu
set-up time
nCP1 to nCP0;
nCP0 to nCP1
16 6
20
24
fmax
maximum clock pulse 30 58
24
20
frequency
ns 4.5 Fig.7
ns 4.5 Fig.7
ns 4.5 Fig.7
ns 4.5 Fig.8
MHz 4.5 Fig.7
December 1990
6
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