BCD to 7-Seg Decoder 7448 Common Cathode

The BCD to 7-Seg Decoder 7448 is a 7400-series IC that converts a 4-bit binary-coded decimal (BCD) input into the seven segment signals needed to show the digits 0 to 9 on a common cathode LED display. Its outputs are active HIGH with internal pull-up resistors, and it adds lamp test and ripple blanking inputs, which makes it a favourite in digital electronics labs for counters and clocks.

BCD to 7-Seg Decoder 7448 Specifications

• Function: BCD to 7-segment decoder/driver
• Display type: common cathode (active-HIGH outputs)
• Outputs: segments a to g, with internal 2 kΩ pull-up resistors
• Inputs: A, B, C, D (BCD), /LT (lamp test), /RBI (ripple blanking input) and /BI-/RBO (blanking input / ripple blanking output)
• Logic family: 7400 series
• Supply voltage: 5 V
• Package: 16-pin DIP
• Power pins: pin 16 = VCC, pin 8 = GND

BCD to 7-Seg Decoder 7448 Applications

• Showing counter outputs, for example from a 7490 decade counter, on a 7-segment display
• Digital clocks, timers and scoreboards in electronics labs
• Teaching binary, BCD and combinational logic
• Blanking leading zeros in multi-digit displays

What's in the Box

• 1 × 7448 BCD to 7-segment decoder IC

Tip: Use it with a common cathode display such as a 0.56 inch 1-digit CC display. The internal 2 kΩ pull-ups supply only a small current, so the segments can look dim; for full brightness add a transistor buffer on each segment. Tie /LT and /RBI to 5 V for normal operation.

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