CD4026 is constructed using the complementary MOS (CMOS) technology, integrated with p-type and n-type enhancement mode transistors. CD4026 consists of a 5 stage Johnson decade counter and an output decoder which converts the Johnson code to a 7 segment decoded output for driving one stage in a numerical display. 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. 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 illuminate the proper segments in a seven segment display device used for representing the decimal numbers 0 to 9. The output of the IC always comes in TTL, making it easy to interface with other TTL, CMOS, and NMOS devices.
What is a Decade Counter?
A decade counter is a serial digital counter which can count up to 10 decimal digits. It goes through 10 unique combinations of output & RESETS for every new clock input. A BCD counter can count 0000, 0001, 0010, 1000, 1001, 1010, 1011, 1110, 1111, 0000, and 0001 and so on.
CD4026 Key Features
- High Voltage Types (20V Rating)
- Decoded 7 Segment Display Outputs and Ripple Blanking
- Counter and 7 Segment Decoding in One Package
- Easily Interfaced with 7 Segment Display Types
- Fully Static Counter Operation DC to 6MHz (typ.) at VDD = 10V
- Ideal for Low-Power Displays
- “Ripple Blanking” and Lamp Test
CD4026 Pinout
| Pin No | Pin Name | Description |
|---|---|---|
| 1 | CLK 1 | clock input signal 1 |
| 2 | CLK-INHIBIT | clock inhibit signal |
| 3 | R BLANKING IN | ripple blanking input signal |
| 4 | R BLANKING OUT | ripple blanking output signal |
| 5 | C- OUT | carryout signal |
| 6 | F | output signal f of counter |
| 7 | G | output signal g of counter |
| 8 | VSS | source supply |
| 9 | D | output signal d of counter |
| 10 | A | output signal a of counter |
| 11 | E | output signal e of counter |
| 12 | B | output signal b of counter |
| 13 | C | output signal c of counter |
| 14 | L- TEST | lamp test signal |
| 15 | RESET | reset value |
| 16 | VDD | Drain supply |
Application
- Decade Counting 7 Segment Decimal Display
- Frequency Division 7 Segment Decimal Displays
- Clocks, Watches, Timers (e.g. ÷ 60, ÷ 60, ÷12 Counter/Display)
CD4026 Datasheet
You can download the datasheet for CD4026 Decade Counters/Divider IC from the link given below:
See Also: CD4086 2-Input AND-OR-INVERT Gate – Datasheet | CD4049 Hex Buffer Converter – Datasheet | CD4514 4-Bit Latch 4-16 Line Decoder – Datasheet
