4028 IC CMOS BCD-To-Decimal Decoder
The CD4028BE is a BCD-to-decimal decoder IC that converts a 4-bit binary coded decimal input into a one-of-ten decimal output. It activates one of the ten output lines (0 to 9) based on the BCD input ranging from 0000 to 1001. If the input value exceeds the valid BCD range (1010 to 1111), all outputs remain low, preventing invalid output states.
This IC is ideal for driving numeric displays, counters, digital clocks, and other BCD-based applications. With high noise immunity, low static power consumption, and wide voltage operating range, the CD4028 operates efficiently in both TTL and CMOS environments. It is built using CMOS technology, offering compatibility with standard logic systems and ensuring reliable operation in a variety of logic-level applications.
Key Features
Converts BCD (4-bit binary) input to one-of-ten decimal outputs
Active high outputs (only one output is HIGH at a time)
Outputs 0–9 correspond directly to input values 0000–1001
Invalid input detection (outputs low for 1010–1111)
High noise immunity and low power consumption
Wide supply voltage range: 3V to 15V
TTL and CMOS compatible
DIP-16 package for easy integration
Pin Configuration (DIP-16)
| Pin | Label | Description |
|---|---|---|
| 1 | O3 | Output for decimal 3 |
| 2 | O2 | Output for decimal 2 |
| 3 | O1 | Output for decimal 1 |
| 4 | O0 | Output for decimal 0 |
| 5 | A | BCD Input A (LSB) |
| 6 | B | BCD Input B |
| 7 | C | BCD Input C |
| 8 | VSS | Ground |
| 9 | D | BCD Input D (MSB) |
| 10 | O9 | Output for decimal 9 |
| 11 | O8 | Output for decimal 8 |
| 12 | O7 | Output for decimal 7 |
| 13 | O6 | Output for decimal 6 |
| 14 | O5 | Output for decimal 5 |
| 15 | O4 | Output for decimal 4 |
| 16 | VDD | Positive Power Supply |
Product Specifications
| Parameter | Value |
|---|---|
| IC Function | BCD to Decimal Decoder |
| Logic Family | CMOS |
| Package | DIP-16 |
| Supply Voltage Range | 3V to 15V |
| High-Level Output | ~VDD |
| Low-Level Output | ~0V ‘ |
| Propagation Delay | ~200 ns at 10V |
| Operating Temp Range | -55°C to +125°C |
| Output Drive Current | ±1.5 mA (depending on VDD) |
Applications
BCD to decimal decoding
Driving 7-segment or numeric displays
Digital counters
Alarm systems and number selectors
Frequency display systems
Logic testing or demonstration circuits
Learning and prototyping kits
