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Part Number: MC14521B

 

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Description: The MC14521B consists of a chain of 24 flipflops with an input circuit that allows three modes of operation. The input ...


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MC14521B General Description


The MC14521B consists of a chain of 24 flipflops with an input circuit that allows three modes of operation. The input will function as a crystal oscillator, an RC oscillator, or as an input buffer for an external oscillator. Each flipflop divides the frequency of the previous flipflop by two, consequently this part will count up to 224  = 16,777,216. The count advances on the negative going edge of the clock. The outputs of the last sevenstages are available for added flexibility.

MC14521B Maximum Ratings

Symbol Parameter Value Unit
VDD DC Supply Voltage Range 0.5 to +18.0 V
Vin,Vout
 Input or Output Voltage Range(DC or Transient) 0.5 to VDD + 0.5
 V
Iin,Iout
 Input or Output Current(DC or Transient)per Pin ±10 mA
PD Power Dissipation, per Package (Note 3.) 500 mW
TA Ambient Temperature Range 55 to +125
Tstg Storage Temperature Range 65 to +150
TL Lead Temperature(8Second Soldering) 260

MC14521B Typical Application

* All Stages are Resettable
* Reset Disables the RC Oscillator for Low Standby Power Drain
* RC and Crystal Oscillator Outputs Are Capable of Driving External Loads
* Test Mode to Reduce Test Time
* VDD and VSS Pins Brought Out on Crystal Oscillator Inverter to Allow the Connection of External Resistors for LowPower Operation
* Supply Voltage Range = 3.0 Vdc to 18 Vdc
* Capable of Driving Two Lowpower TTL Loads or One Lowpower Schottky TTL Load over the Rated Temperature Range.

MC14521B Connection Diagram

MC14521B Connection Diagram

MC14521B datasheet

MC14521B
PDF/DataSheet Download

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