CD40109 Low-to-High Voltage Level Shifter


CD40109 belongs to 4000 Series CMOS Logic Family of Integrated Circuits (IC’s) constructed with N- and P-channel enhancement mode transistors. CD40109 has Low-to-High Voltage Level Shifter

CD40109 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.

CD40109 Features

  • High-Voltage Types (20V Rating)
  • Independence of Power Supply Sequence Considerations
    • VCC can Exceed VDD
    • Input Signals can Exceed Both VCC and VDD
  • Up and Down Level Shifting Capability
  • Three-State Outputs with Separate Enable Controls
  • 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

CD40109 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

CD40109 Pinout Diagram

CD40109 Pin Description

Pin NoPin NameDescription
1VCCCollector Voltage
2ENABLE AEnable Pin A
3AInput Of Level Shifter 1
4E Input Of Level Shifter 3
5F Input Of Level Shifter 4
6B Input Of Level Shifter 2
7ENABLE B Enable Pin B
8VSSSupply Voltage
9ENABLE C Enable Pin C
10C Output Of Level Shifter 1
11G Output Of Level Shifter 3
12NCNot Connected
13H Output Of Level Shifter 4
14D Output Of Level Shifter 2
15ENABLE D Enable Pin D
16VDDDrain Voltage

CD40109 Circuit


  • High or Low Level Shifting with Three-State Outputs for Unidirectional or Bidirectional Bussing
  • Isolation of Logic Subsystems Using Separate Power Supplies from Supply Sequencing, Supply Loss and
    • Supply Regulation Consideration

CD40109 Alternative Equivalent


Download CD40109 Low-to-High Voltage Level Shifter Datasheet from the link given below.