74147 IC High Speed CMOS Logic 10 to 4 Line Priority Encoder DIP-16
The 74147 IC High-Speed CMOS Logic 10 to 4 Line Priority Encoder (DIP-16) is a digital device designed to convert ten active low input signals into a 4-bit binary coded decimal (BCD) output. It assigns priority to the highest-order active input, ensuring reliable encoding even when multiple inputs are active simultaneously. This IC is widely used in digital systems for key encoding, data compression, and input device interfacing. With its high-speed operation, low power consumption, and TTL/CMOS compatibility, the 74147 provides an efficient solution for priority encoding applications in logic circuits and microprocessor-based systems.
Features
- Converts 10 active low inputs to a 4-bit binary coded decimal (BCD) output.
- Provides priority encoding — highest input has priority when multiple inputs are active.
- TTL and CMOS logic level compatible.
- High-speed and low power consumption operation.
- Easy cascading for expanding input capacity.
- Standard 16-pin Dual In-Line Package (DIP-16) for easy prototyping and PCB mounting.
- Wide operating voltage range for flexible circuit design.
- Ideal for digital encoding, keyboard interfaces, and data selection systems.
Pinout Configuration
Logic Symbol
Truth Table
| Decimal Digits | BCD Code | |||
| 0 | A | B | C | D |
| 1 | 0 | 0 | 0 | 0 |
| 2 | 0 | 0 | 0 | 1 |
| 3 | 0 | 0 | 1 | 1 |
| 4 | 0 | 1 | 0 | 0 |
| 5 | 0 | 1 | 0 | 1 |
| 6 | 0 | 1 | 1 | 0 |
| 7 | 0 | 1 | 1 | 1 |
| 8 | 1 | 0 | 0 | 0 |
| 9 | 1 | 0 | 0 | 1 |
Specifications
| Parameter | Description |
|---|---|
| IC Number | 74147 |
| Function Type | 10-to-4 Line Priority Encoder |
| Logic Family | TTL / CMOS Compatible |
| Input Type | Active Low |
| Output Type | Binary Coded Decimal (BCD) |
| Number of Inputs | 10 |
| Number of Outputs | 4 |
| Propagation Delay Time | 20 nsec |
| Operating Voltage (Vcc) | 4.75V to 5.25V |
| High-Level Output Voltage (min) | 2.4V |
| Low-Level Output Voltage (max) | 0.4V |
| Input High Voltage (min) | 2.0V |
| Input Low Voltage (max) | 0.8V |
| Power Dissipation | 500 mW |
| Operating Temperature | 0°C to +70°C |
| Package Type | DIP-16 (Dual Inline Package) |
| Mounting Type | Through Hole |
Dimensions
Applications
- Keyboard and keypad encoding systems.
- Digital data selection and compression circuits.
- Binary coded decimal (BCD) generation in digital systems.
- Input prioritization in control and automation systems.
- Microprocessor and microcontroller interfacing.
- Signal multiplexing and data routing applications.
- Display and indicator control circuits.
- Digital communication and encoding logic designs.
Package Contents
- 1 x 74147 IC High Speed CMOS Logic 10 to 4 Line Priority Encoder DIP-16