7448 IC BCD to 7-Segment Decoder DIP-16
The IC 7448 converts a 4-bit BCD input (binary-coded decimal) into signals that directly control a common-cathode 7-segment display. It provides seven active-HIGH outputs (a–g) that light up individual segments to display decimal numbers from 0 to 9. Inputs from 1010 to 1111 result in blank or undefined outputs.
This IC includes additional features such as lamp test (LT), blanking input (BI), and ripple-blanking input/output (RBI/RBO), which enhance multi-digit display control and testing. Engineers often use it to drive digital readouts in counters, clocks, meters, and automation systems. The active-HIGH outputs make it suitable for common-cathode displays, where segment pins connect to GND.
You can easily connect the 7448 to binary counters or microcontroller outputs. It handles logic conversion and segment driving without needing extra software or logic components. The IC integrates smoothly with other TTL devices and standard 5V logic systems.
Key Features
Converts 4-bit BCD into 7-segment active-HIGH outputs
Designed for common-cathode LED displays
Supports lamp test, blanking, and ripple-blanking
TTL-compatible input and output levels
No need for external logic or conversion circuits
Packaged in DIP-16 or SOIC-16 form factors
Easy cascading for multi-digit display systems
Applications
Drive 7-segment displays with simple BCD logic inputs.
Display decimal numbers in counters and time displays.
Control LED digits in meters, clocks, and voltmeters.
Interface binary counters with visual numeric output.
Add numeric displays to digital control systems.
Use ripple-blanking to build multi-digit readouts.
Include lamp test for diagnostic or startup lighting.
Simplify display control in embedded electronics.
Implement front-panel indicators in appliances.
Teach BCD and 7-segment decoding in educational circuits.
Specifications Table
| Parameter | Value |
|---|---|
| Logic Family | TTL |
| Input Type | 4-bit BCD |
| Output Type | 7 active-HIGH outputs (a–g) |
| Display Type | Common-Cathode 7-Segment |
| Input HIGH Voltage | ≥ 2.0V |
| Input LOW Voltage | ≤ 0.8V |
| Output HIGH Voltage | ≥ 2.4V |
| Output LOW Voltage | ≤ 0.4V |
| Output Source Current | ~5.2 mA per segment (typical) |
| Supply Voltage (Vcc) | 4.75V to 5.25V |
| Typical Operating Voltage | 5V ‘ |
| Propagation Delay | ~25–35 ns |
| Power Consumption | ~25 mW (typical) |
| Operating Temperature | 0°C to 70°C |
| Package Type | DIP-16 / SOIC-16 |
| Pin Count | 16 |
