BCD to Decimal Decoder IC 7442

The BCD to Decimal Decoder IC 7442 is a 7400-series logic chip that converts a 4-bit binary-coded decimal (BCD) input into one of ten outputs. For each input from 0 to 9, the matching output goes LOW while the other nine stay HIGH, and the invalid codes 10 to 15 leave all outputs HIGH. It is a standard part in digital electronics labs for counters, selectors and LED displays.

BCD to Decimal Decoder IC 7442 Specifications

• Function: 4-line BCD to 10-line decimal decoder
• Inputs: A, B, C and D (A is the least significant bit)
• Outputs: 0 to 9, active LOW
• Invalid inputs: codes 10 to 15 give all outputs HIGH
• Logic family: 7400 series
• Supply voltage: 5 V
• Package: 16-pin DIP
• Power pins: pin 16 = VCC, pin 8 = GND

BCD to Decimal Decoder IC 7442 Applications

• Driving 10 LEDs from a 7490 decade counter for a running light
• Selecting one of ten devices or channels from a 4-bit code
• Use as a 3-to-8 line decoder on outputs 0 to 7, with input D as an enable
• Teaching BCD, decoders and combinational logic
• Digital lab experiments and university practicals

What's in the Box

• 1 × 7442 BCD to decimal decoder IC

Tip: Because the outputs are active LOW, connect each LED with its cathode to the output and its anode to 5 V through a 470 Ω resistor; the selected LED then lights. Add a 100 nF capacitor between pins 16 and 8, close to the chip.

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