CD4518 Dual BCD Up Counter


CD4518 belongs to the 4000 Series CMOS Logic Family of Integrated Circuits (IC’s) constructed with N- and P-channel enhancement mode transistors. CD4518 has Dual BCD Up Counter

CD4518 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.

CD4518 Features

  • High Voltage Types (20V Rating)
  • CD4518BMS Dual BCD Up Counter
  • CD4520BMS Dual Binary Up Counter
  • Medium Speed Operation
    • 6MHz Typical Clock Frequency at 10V
  • Positive or Negative Edge Triggering
  • Synchronous Internal Carry Propagatio
  • High-Voltage Types (20V Rating)
  • Propagation Delay Time = 60ns (Typ.) at CL = 50pF, VDD = 10V
  • Buffered Inputs and Outputs
  • Standard Symmetrical Output Characteristics
  • 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
  • Noise Margin (Over Full Package Temperature Range):
    • 1V at VDD = 5V
    • 2V at VDD = 10V
    • 2.5V at VDD = 15V

CD4518 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

CD4518 Pinout Diagram

CD4518 Pin Description

Pin NoPin NameDescription
1CLK AClock Pin A
2ENABLE AEnable Pin A
3Q1ACounter Output 1A
4Q2A Counter Output 2A
5Q3A Counter Output 3A
6Q4A Counter Output 4A
7RESET AReset Pin A
8VSSSupply Voltage
9CLK B Clock Pin B
10ENABLE B Enable Pin B
11Q1B Counter Output 1B
12Q2B Counter Output 2B
13Q3B Counter Output 3B
14Q4B Counter Output 4B
15RESET B Reset Pin B
16VDDDrain Voltage

CD4518 Circuit


  • Multistage Synchronous Counting
  • Multistage Ripple Counting
  • Frequency Dividers

CD4518 Alternative Equivalent

CD4518, CD4520

Download CD4518 Dual BCD Up Counter Datasheet from the link given below.