HCF4521 [STMICROELECTRONICS]
24 STAGE FREQUENCY DIVIDER; 24级分频器
| 型号： | HCF4521 |
| 厂家： | 
ST |
| 描述： | 24 STAGE FREQUENCY DIVIDER |
| 文件： | 总12页 (文件大小：104K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
HCF4521B
24 STAGE FREQUENCY DIVIDER
■
■
■
■
■
VERY LOW QUIESCENT CURRENT
HIGH NOISEIMMUNITY
VOLTAGESUPPLYRANGE3V TO 18V
ALLSTAGESARE RESETTABLE
RESETDISABLES THE RC OSCILLATORFOR
LOWSTANDBY POWER DRAIN
RC AND CRYSTAL OSCILLATOROUTPUT
ARE CAPABLEOF DRIVING EXTERNAL
LOADS
■
DESCRIPTION
The HCF4521B is a monolithic integrated circuit,
available in 16-lead dual-in-line plastic package
and plastic micro packages.
EY
M1
(Plastic Package)
(Micro Package)
ORDER CODES :
The HCF4521B have a chain of 24 flip-flops with
an input circuit that allows three modes of
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
HCF4521BEY
HCF4521BM1
divide-by-two function giving a total count of 224
=
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
1/12
February 1999
HCF4521
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATING
Symbol
Parameter
Value
-0.5to+18
-0.5toVDD +0.5
± 10
Unit
V
VDD
Vi
*
Supply Voltage
Input Voltage
V
II
DC Input Current (any one input)
mA
mW
P
tot
Total Power Dissipation (per package)
Dissipation per Output Transistor
200
100
mW
oC
oC
for Top = Full Package Temperature Range
Top
Operating Temperature
-40to+85
-65to+150
Tstg
Storage Temperature
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 mayaffect device reliability.
* Allvoltage values are referred toVSS pin voltage.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Value
3to15
Unit
V
VDD
Supply Voltage
V
Input Voltage
0toVDD
-40to+85
V
oC
I
Top
Operating Temperature
2/12
HCF4521
FUNCTIONAL DIAGRAM
3/12
HCF4521
STATIC ELECTRICAL CHARACTERISTICS
(over recommended operating conditions, voltages
References to VSS)
Symbol
IL
Parameter
Test Conditios
Value
25 oC
Unit
VI
(V)
VO
|IO| VDD
-40 oC
85 oC
(V)
( A) (V)
µ
Min. Max. Min. Typ. Max. Min. Max.
Quiescent Current
0/5
0/10
0/15
0/5
5
20
40
80
0.04
0.04
0.04
20
40
80
150
300
600
µA
V
10
15
VOH
VOL
VIH
Output High
Voltage
< 1
5
4.95
4.95
9.95
4.95
9.95
0/10
0/15
5/0
< 1 10 9.95
< 1 15 14.95
14.95
14.95
Output Low
Voltage
< 1
5
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
V
10/0
15/0
< 1 10
< 1 15
Input High
Voltage
0.5/4.5 < 1
1/9 < 1 10
1.5/13.5 < 1 15
4.5/0.5 < 1
9/1 < 1 10
13.5/1.5 < 1 15
5
3.5
7
3.5
7
3.5
7
V
11
11
11
VIL
Input Low
Voltage
5
1.5
3
1.5
3
1.5
3
V
4
4
4
IOH
Output Drive
Current
0/5
0/5
2.5
4.6
9.5
13.5
0.4
0.5
1.5
5
-1.53
-0.52
-1.3
-3.5
0.52
1.3
-1.36 -3.2
-1.1
-0.36
-0.9
-2.4
0.36
0.9
5
-0.44
-1.1
-3.0
0.44
1.1
-1
-2.6
-6.8
1
mA
mA
0/10
0/15
0/5
10
15
5
IOL
Output Sink Current
0/10
0/15
10
15
2.6
6.8
3.6
3.0
2.4
I , I
IH IL
Input Leakage
Current
0/18 AnyInput
18
0.1
±
10-5
0.1
±
1
±
A
µ
±
CI
Input Capacitance
Any Input
5
7.5
pF
TheNoise Margin forboth ”1”and ”0” level is:1V min.withVDD = 5 V, 2V min.withVDD =10V, 2.5V min.withVDD= 15V
4/12
HCF4521
(Tamb = 25 oC, CL =50 pF, RL = 200KΩ,
typical temperaturecoefficentfor all VDD valuesis 03 %/oC, all input rise andfall times= 20 ns)
DYNAMIC ELECTRICAL CHARACTERISTICS
Symbol
Parameter
Test Conditions
VDD
Value
Min. Typ. Max.
Unit
(V)
tPLH
Output Rise Time
5
100
50
200
100
80
ns
ns
µs
10
15
5
40
tPHL
Output Fall Time
100
50
200
100
80
10
15
5
40
tPHL
tPLH
Propagation Delay Time Clock to Q18
Propagation Delay Time Clock to Q24
Propagation Delay Time RESET to Qn
4.5
1.7
1.3
6.0
2.2
1.7
1300
500
375
140
55
9.0
10
15
5
3.5
2.7
tPHL
tPLH
12
s
µ
10
15
5
4.5
3.5
tPHL
2600
1000
750
ns
ns
10
15
5
tWH(cl) Clock Pulse Width
385
150
120
10
15
5
40
fcl
Clock Pulse Frequency
Clock Rise and Fall Time
Reset Pulse Width
3.5
9
2
5
MHz
10
15
5
12
6.5
15
15
15
tTLH
tTHL
s
µ
10
15
5
tW(R)
1400
600
700
300
225
ns
10
15
450
5/12
HCF4521
Typical Output Low (sink) Current Characteristics
Minimum Output Low (sink) Current
Characteristics
Typical Output High (source) Current
Characteristics
Minimum Output High (source) Current
Characteristics
Typical Power Dissipation vs, Frequency
6/12
HCF4521
FUNCTIONAL TEST SEQUENCE
Inputs
Outputs
VDD
Comments
RESET In2
Out2
VSS
’
’
Q18 thru
Q24
1
0
0
VDD
GND
0
Counter is in three 8-stage sections in parallel mode.
Counter is reset. In2 and Out2 are connected togheter
0
0
0
0
0
0
0
0
0
1
0
1
1
0
0
1
1
0
1
0
1
1
0
0
0
0
1
VDD
VDD
GND
GND
GND
GND
GND
GND
VDD
0
0
0
1
1
1
1
1
0
First ”0” to ”1” transition on In2, Out2 node.
255 ”0” to ”1” transitions are clocked into this In2, Out2
node.
VDD
VDD
The 255th ”0” to ”1” transition.
VDD
GND
GND
GND
GND
Counter converted back to 24-stages in series mode.
Out2 converts back to an output
VDD
VDD
Counter ripples from an all ”1” state to an all ”0” stage.
A test function (see fig.8) has been included forthe reduction oftest time required to exercise all 24 counter stages. This test function divides the counter
intothree 8-stage sections and 255counts are loaded ineachofthe8-stage sections inparallel.Allflip-flopare now ata logic”1”. The counter isnow
returned tothe normal 24-stages in series configuration. One morepulse is entered intoInput2 (In2)which willcause the counter to ripplefromanall”1”
state to an all ”0” state.
RC Oscillator Circuit
Functional Test Circuit
1
2.3 RTC
RS 2R
f
C
≥
TC
finHz, Rin Ohms,C inFarads
7/12
HCF4521
TYPICAL DATA FOR CRYSTAL OSCILLATOR CIRCUIT
Characteristic
500 kHz
CIRCUIT
50 kHz CIRCUIT Unit
Crystal Characteristics
Resonant Frequency
Equivalent Reistance, RS
500
1
50
6.2
kHz
k
Ω
External Resistor/Capacitor Values
RO
CT
CS
47
82
20
750
82
20
kΩ
pF
pF
Frequency Stability
Frequency Change as a Function of VDD (TA = 25 oC)
VDD Change from 5V to 10V
VDD Change from 10V to 15V
Frequency Change as a Function of Temperature (VDD = 10 V)
TA Change from -55 oC to 25 oC
HCF4521B only
6
2
2
2
ppm
ppm
-4
100
-2
120
ppm
ppm
Complete Oscillator *
TA Change from 25 oC to 125 oC
HCF4521B only
-2
-160
-2
-560
ppm
ppm
Complete Oscillator *
* Complete oscillator includes crystal, capacitors and resistors.
Crystal Oscillator Circuit
* Optional for low power operation.
8/12
HCF4521
TEST CIRCUITS
QuiescentDevice Current.
Noise Immunity.
Input Leakage Current.
9/12
HCF4521
Plastic DIP-16 (0.25) MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
0.51
0.77
TYP.
MAX.
MIN.
0.020
0.030
MAX.
a1
B
b
1.65
0.065
0.5
0.020
0.010
b1
D
E
e
0.25
20
0.787
8.5
0.335
0.100
0.700
2.54
17.78
e3
F
7.1
5.1
0.280
0.201
I
L
3.3
0.130
Z
1.27
0.050
P001C
10/12
HCF4521
SO-16 MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
TYP.
MAX.
1.75
0.2
MIN.
MAX.
0.068
0.007
0.064
0.018
0.010
A
a1
a2
b
0.1
0.004
1.65
0.46
0.25
0.35
0.19
0.013
0.007
b1
C
0.5
0.019
c1
D
45 (typ.)
9.8
5.8
10
0.385
0.228
0.393
0.244
E
6.2
e
1.27
8.89
0.050
0.350
e3
F
3.8
4.6
0.5
4.0
5.3
0.149
0.181
0.019
0.157
0.208
0.050
0.024
G
L
1.27
0.62
M
S
8 (max.)
P013H
11/12
HCF4521
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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1999 STMicroelectronics – Printed in Italy – All Rights Reserved
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12/12
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