CD4521 24-Stage Frequency Divider


CD4521 belongs to 4000 Series CMOS Logic Family of Integrated Circuits (IC’s) constructed with N- and P-channel enhancement mode transistors. CD4521 has a 24-Stage Frequency Divider

CD4521 has a supply voltage range of 5V to 20V, which is much higher than any contemporary logic family. It has buffered output which improves transfer characteristics by providing very high gain. All inputs are protected against static discharge with diodes to VDD and VSS.

CD4521 Features

  • Reset disabies the RC oscillator for low-power standby condition
  • Voo’ and Vss’ pins are brought out from the crystal oscillator to allow use of external resistors for ow-power operation
  • 100% Tested for Maximum Quiescent Current at 20V
  • 5V, 10V, and 15V Parametric Ratings
  • Maximum Input Current of 1μA at 18V Over Full Package Temperature Range; 100nA at 18V and +25oC

CD4521 Specifications

Absolute Maximum Ratings

  • DC Supply Voltage Range, (VDD): -0.5V to +20V (Voltage Referenced to VSS Terminals)
  • Input Voltage Range, All Inputs: -0.5V to VDD +0.5V
  • DC Input Current, Any One Input: ±10mA
  • Operating Temperature Range: -55oC to +125oC Package Types D, F, K, H
  • Storage Temperature Range (TSTG): -65oC to +150oC
  • Lead Temperature (During Soldering): +265oC
    • At Distance 1/16 ± 1/32 Inch (1.59mm ± 0.79mm) from case for 10s Maximum

CD4521 Pinout Diagram

CD4521 Pin Description

Pin NoPin NameDescription
1Q24Frequency Divider Output Q24
2RESETReset Pin
3VSS’Invert Supply Voltage
4OUT 2Output Pin 2
5VDD’Invert Drain Voltage
6IN 2Input Pin 2
7OUT 1Output Pin 1
8VSSSupply Voltage
9IN 1Input Pin 1
10Q18 Frequency Divider Output Q18
11Q19 Frequency Divider Output Q19
12Q20 Frequency Divider Output Q20
13Q21 Frequency Divider Output Q21
14Q22 Frequency Divider Output Q22
15Q23 Frequency Divider Output Q23
16VDDDrain Voltage

CD4521 Circuit


  • Frequency Synthesizers
  • Audio Equipment
  • Radar and Satellite Communication
  • Military Equipment

CD4521 Alternative Equivalent

Download CD4521 24-Stage Frequency Divider Datasheet from the link given below.