CD4043 Quad NOR R-S Latch Tri-state


CD4043 belongs to the 4000 Series CMOS Logic Family of Integrated Circuits (IC’s) constructed with N- and P-channel enhancement mode transistors. CD4043 has Quad NOR R-S Latch Tri-state

CD4043 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.

CD4043 Features

  • Wide supply voltage range: 3V to 15V
  • Low power: 100 nW (typ.)
  • High noise immunity: 0.45 VDD (typ.)
  • Separate SET and RESET inputs for each latch
  • NOR and NAND configuration
  • 3-STATE output with common output enable

CD4043 Specifications

Absolute Maximum Ratings

  • DC Supply Voltage Range, (VDD): -0.5V to +18V (Voltage Referenced to VSS Terminals)
  • Input Voltage Range, All Inputs: -0.5V to VDD +0.5V
  • Storage Temperature Range (TSTG): -65oC to +150oC
  • Lead Temperature (During Soldering): +265oC
  • Power Dissipation (PD)
    • Dual-In-Line 700 mW
    • Small Outline 500 mW

CD4043 Pinout Diagram

CD4043 Pin Description

Pin NoPin NameDescription
1Q4Output Of Latch 4
2Q1 Output Of Latch 1
3R1Reset 1
4S1Set 1
5ENABLEEnable Pin
6S2 Set 2
7R2 Reset 2
8VSSSupply Voltage
9Q2 Output Of Latch 2
10Q3 Output Of Latch 3
11R3 Reset 3
12S3 Set 3
13NCNo Connection
14S4 Set 4
15R4 Reset 4
16VDDDrain Voltage

CD4043 Circuit


  • Multiple bus storage
  • Strobed register
  • Four bits of independent storage with output enable
  • General digital logic

CD4043 Alternative Equivalent


Download CD4043 Quad NOR R-S Latch Tri-state Datasheet from the link given below.