# Decoders

A decoder reads a number from its input pins and represents this number in a different format on the output pins. The input value is typically represented in binary format, with a pin for each binary digit ('bit').

The output pins may represent numbers as follows:

1. Pin-for-each-value: (e.g. '1-of-10' decoder) a unique pin represents each possible number. Only one output can be active at a time.
2. 7-segment display format: the outputs are suitable for driving a 7-segment display part.

Some 7-segment display decoders have additional special inputs:

- 'Ripple blanking' causes the display to turn off when a zero is displayed
- The 'lamp test' causes all the display segments to be active.

## See also:

- Logic family parts
- Simulation of Digital ICs
- Using electronics parts