CD40257-Quad 2-line to 1-line data selector/multiplexer


CD40257 belongs to the 4000 Series CMOS Logic Family of Integrated Circuits (IC’s) constructed with N- and P-channel enhancement mode transistors. CD40257 has Quad 2-line to 1-line data selector/multiplexer

CD40257 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.

CD40257 Features

  • 3-States 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

CD40257 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

CD40257 Pinout Diagram

CD40257 Pin Description

Pin NoPin NameDescription
1INPUT SELECTInput Select Pin
2A1Input 1 Of Multiplexer 1
3B1 Input 2 Of Multiplexer 1
4D1 Input 3 Of Multiplexer 1
5A2 Input 1 Of Multiplexer 2
6B2 Input 2 Of Multiplexer 2
7D2 Input 3 Of Multiplexer 2
8VSSSupply Voltage
9D3 Input 3 Of Multiplexer 3
10B3 Input 2 Of Multiplexer 3
11A3 Input 1 Of Multiplexer 3
12D4 Input 3 Of Multiplexer 4
13B4 Input 2 Of Multiplexer 4
14A4 Input 1 Of Multiplexer 4
15OUTPUT DISABLEOutput Disable Pin
16VDDDrain Voltage

CD40257 Circuit


  • Digital Multiplexing
  • Shiftright/shift-left registers
  • True/complement selection

CD40257 Alternative Equivalent

Download CD40257-Quad 2-line to 1-line data selector/multiplexer Datasheet from the link given below.