operation. The input circuit functions as a crystal
or an RC oscillator or as an input buffer for an
external oscillator. Each flip-flop performs a
divide-by-two function giving a total count of 2
24
=
16,777,216. The count advances on the negative
going edge of the clock. Access is available to the
final seven stages giving the device added
flexibility.
PIN CONNECTION
February 1999
1/12
HCF4521
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATING
Symbol
V
DD
*
V
i
I
I
P
tot
Supply Voltage
Input Voltage
DC Input Current (any one input)
Total Power Dissipation (per package)
Dissipation per Output Transistor
for Top = Full Package Temperature Range
Operating Temperature
Storage Temperature
Parameter
Value
-0.5 to +18
-0.5 to V
DD
+ 0.5
±
10
200
100
-40 to +85
-65 to +150
Unit
V
V
mA
mW
mW
o
o
T
op
T
stg
C
C
Stresses above those listedunder ”Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional
operation ofthe device atthese or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to
absolute maximum ratingconditions for external periods may affect device reliability.
* Allvoltage values are referred to V
SS
pin voltage.
RECOMMENDED OPERATING CONDITIONS
Symbol
V
DD
V
I
T
op
Supply Voltage
Input Voltage
Operating Temperature
Parameter
Value
3 to 15
0 to V
DD
-40 to +85
Unit
V
V
o
C
2/12
HCF4521
FUNCTIONAL DIAGRAM
3/12
HCF4521
STATIC ELECTRICAL CHARACTERISTICS
(over recommended operating conditions, voltages
References to V
SS
)
Symb ol
Parameter
T est Cond it ios
V
I
V
O
|I
O
| V
DD
-40
(
µ
A) (V)
Min.
(V)
(V)
0/5
5
0/10
10
0/15
15
0/5
<1
5
4.95
0/10
< 1 10 9.95
0/15
< 1 15 14.95
5/0
<1
5
10/0
< 1 10
15/0
< 1 15
0.5/4.5 < 1
5
3.5
1/9
< 1 10
7
1.5/13.5 < 1 15
11
4.5/0.5 < 1
5
9/1
< 1 10
13.5/1.5 < 1 15
0/5
2.5
5
-1.53
0/5
4.6
5
-0.52
0/10
9.5
10
-1.3
0/15
13.5
15
-3.5
0/5
0.4
5
0.52
0/10
0.5
10
1.3
0/15
1.5
15
3.6
0/18 Any Input
Any Input
18
o
I
L
Quiescent Current
V
OH
Output High
Voltage
Output Low
Voltage
Input High
Voltage
Input Low
Voltage
Output Drive
Current
V
OL
V
IH
V
IL
I
OH
I
OL
Output Sink Current
Valu e
o
C
25 C
85
Max. Min. T yp. Max. Min .
20
0.04
20
40
0.04
40
80
0.04
80
4.95
4.95
9.95
9.95
14.95
14.95
0.05
0.05
0.05
0.05
0.05
0.05
3.5
3.5
7
7
11
11
1.5
1.5
3
3
4
4
-1.36 -3.2
-1.1
-0.44
-1
-0.36
-1.1
-2.6
-0.9
-3.0
-6.8
-2.4
0.44
1
0.36
1.1
2.6
0.9
3.0
6.8
2.4
±
0.1
±
10
-5
5
±
0.1
7.5
Un it
o
C
Max.
150
300
600
µA
V
0.05
0.05
0.05
V
V
1.5
3
4
V
mA
mA
I
IH
, I
IL
C
I
Input Leakage
Current
Input Capacitance
±
1
µ
A
pF
TheNoise Margin for both ”1” and ”0” level is: 1V min.withV
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