100. 15. 40. 80. tPHL. tPLH. Propagation Delay Time Clock to Q18. 5. 4.5. 9.0. µs. 10. 1.7. 3.5. 15. 1.3. 2.7 ... All flip-flopare now ata logic â1â. The counter is now.
VERY LOW QUIESCENT CURRENT HIGH NOISE IMMUNITY VOLTAGE SUPPLY RANGE 3V TO 18V ALL STAGES ARE RESETTABLE RESET DISABLES THE RC OSCILLATORFOR LOW STANDBY POWER DRAIN RC AND CRYSTAL OSCILLATOR OUTPUT ARE CAPABLE OF DRIVING EXTERNAL LOADS
DESCRIPTION The HCF4521B is a monolithic integrated circuit, available in 16-lead dual-in-line plastic package and plastic micro packages. 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 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.
EY M1 (Plastic Package) (Micro Package) ORDER CODES : HCF4521BEY HCF4521BM1
PIN CONNECTION
February 1999
1/12
HCF4521 BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATING Symbol VDD *
Parameter Supply Voltage
Value
Unit
-0.5 to +18
V
-0.5 to VDD + 0.5
V
Vi
Input Voltage
II
DC Input Current (any one input)
± 10
mA
Total Power Dissipation (per package) Dissipation per Output Transistor for Top = Full Package Temperature Range
200
mW
100
mW
Ptot
Top
Operating Temperature
-40 to +85
o
Tstg
Storage Temperature
-65 to +150
o
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 VSS pin voltage.
RECOMMENDED OPERATING CONDITIONS Symbol
Parameter
Value
Unit
Supply Voltage
3 to 15
V
VI
Input Voltage
0 to VDD
V
Top
Operating Temperature
VDD
2/12
-40 to +85
o
C
HCF4521 FUNCTIONAL DIAGRAM
3/12
HCF4521 STATIC ELECTRICAL CHARACTERISTICS (over recommended operating conditions, voltages References to VSS) Symb ol
Parameter
T est Cond it ios VO |IO | V DD -40 (µA) (V) Min. (V) 0/5 5 0/10 10 0/15 15 0/5
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.
The HCC4521B and HCF4521B are monolithic in- tegrated circuits, available in 16-lead dual-in-line plastic or ceramic packages and plastic micro pack- ages.
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