CD4056 BCD to 7-Segment Decoder/Driver


CD4056 belongs to the 4000 Series CMOS Logic Family of Integrated Circuits (IC’s) constructed with N- and P-channel enhancement mode transistors. CD4056 has BCD to 7-Segment Decoder/Driver

CD4056 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.

CD4056 Features

  • 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

CD4056 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

CD4056 Pinout Diagram

CD4056 Pin Description

Pin NoPin NameDescription
1STROBEStrobe Pin
22^2BCD Input Pin
32^1 BCD Input Pin
42^3 BCD Input Pin
52^0 BCD Input Pin
6DIS:FREQ: INDisplay Frequency Input Pin
7VEEEmitter Voltage
8VSSSupply Voltage
9a7-Segment Output Pin a
10b 7-Segment Output Pin b
11c 7-Segment Output Pin c
12d 7-Segment Output Pin d
13e 7-Segment Output Pin (e)
14g 7-Segment Output Pin (g)
15f 7-Segment Output Pin f
16VDDDrain Voltage

CD4056 Circuit


  • General Purpose displays
  • Calculators and Meters
  • Wall and Table Clock
  • Panel Meters
  • Appliance Control panel

CD4056 Alternative Equivalent

CD4054, CD4055

Download CD4056 BCD to 7-Segment Decoder/Driver Datasheet from the link given below