CD4028 BCD to Binary Decoder

Overview

The CD4028 is a BCD-to-decimal or binary-to-octal decoder consisting of 4 inputs, decoding logic gates, and 10 output buffers. A BCD code applied to the 4 inputs, A, B, C, and D, results in a high level at the selected 1-of-10 decimal decoded outputs. Similarly, a 3-bit binary code applied to inputs A, B, and C is decoded in octal at outputs 0–7. A high level signal at the D input inhibits octal decoding and causes outputs 0–7 to go LOW.

All inputs are protected against static discharge damage by diode clamps to V_DD and V_SS.

Applications

• Code conversion
• Address decoding
• Indicator-tube decode

Specifications

Wide supply voltage range: 3.0V to 15V
High noise immunity: 0.45 VDD (typ.)
Low power TTL compatibility: fan out of 2 driving 74L or 1 driving 74LS
Low power
Glitch free outputs
“Positive logic” on inputs and outputs
This is a Thru-Hole Device