CD4033 - 5-Stage Johnson Decade counter IC

CD4033 - 5-Stage Johnson Decade counter IC

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  • Counter and 7-segment decoding in one package
  • Easily interfaced with 7-segment display types
  • Fully static counter operation: DC to 6 MHz (typ.) at VDD = 10 V
  • Ideal for low-power displays
  • Display enable output (CD4026B)
  • “Ripple blanking” and lamp test (CD4033B)
  • 100% tested for quiescent current at 20 V
  • Standardized, symmetrical output characteristics
  • 5-V, 10-V, and 15-V parametric ratings
  • Schmitt-triggered clock inputs
  • Meets all requirements of JEDEC Tentative Standard No. 13B, “Standard Specifications for Description of ’B’ Series CMOS Devices”

CD4033 - 5-Stage Johnson Decade counter IC

CD4033 consists of a 5-stage Johnson decade counter and an output decoder that converts the Johnson code to a 7-segment decoded output for driving one stage in a numerical display.

These devices are particularly advantageous in display applications where low power dissipation and /or low package count are important.

Inputs common to both types are CLOCK, RESET, & CLOCK INHIBIT; common outputs are CARRY OUT and the seven decoded outputs (a, b, c, d, e, f, g).  Signals peculiar to the CD4033 are RIPPLE-BLANKING INPUT AND LAMP TEST INPUT and a RIPPLE-BLANKING OUTPUT.

A high RESET signal clears the decade counter to its zero counts. The counter is advanced one count at the positive clock signal transition if the CLOCK INHIBIT signal is low. Counter advancement via the clock line is inhibited when the CLOCK INHIBIT signal is high. The CLOCK INHIBIT signal can be used as a negative-edge clock if the clock line is held high. Anti-lock gating is provided on the JOHNSON counter, thus assuring proper counting sequence. The CARRY-OUT (Cout) signal completes one cycle every ten CLOCK INPUT cycles and is used to clock the succeeding decade directly in a multi-decade counting chain. The seven decoded outputs (a, b, c, d, e, f, g) illuminate the proper segments in a seven-segment display device used for representing the decimal numbers 0 to 9. The 7-segment outputs go high on selection in the CD4033.

The CD4033 series types are supplied in 16-lead dual-in-line plastic packages (E suffix), 16-lead small-outline packages (NSR suffix), and 16-lead thin shrink small-outline packages (PW and PWR suffixes).


  • Decade counting 7-segment decimal display
  • Frequency division 7-segment decimal displays
  • Clocks, watches, timers (e.g. ÷60, ÷60, ÷ 12 counter/display)
  • Counter/display driver for meter applications

Package Includes:

Selected qty of IC - CD4033


Part number CD4033B
Technology Family CD4000
VCC (Min) (V) 3
VCC (Max) (V) 18
Bits (#) 7
Voltage (Nom) (V) 5, 10, 15
F @ nom voltage (Max)(MHz) 8
ICC @ nom voltage (Max)(mA) 0.03
tpd @ nom Voltage (Max)(ns) 250
IOL (Max) (mA) 1.5
IOH (Max) (mA) -1.5
Function Counter
Type Decade
Rating See Data Sheet
Operating temperature range (C) -55 to 125
Package Group PDIP|16