HEF4556B is Dual 1-of-4 decoder/demultiplexer manufactured by NXP Semiconductors.
| Part Number | Description |
|---|---|
| HEF4555B | 1-of-4 decoder/demultiplexer |
| HEF4557B | 1-to-64 bit variable length shift register |
| HEF4502B | Strobed hex inverter/buffer |
| HEF4505B | 64-bit/ 1-bit per word random access read/write memory |
| HEF4508B | Dual 4-bit latch |
The HEF4556B is a dual 1-of-4 decoder/demultiplexer. Each has two address inputs (A0 and A1), an active LOW enable input (E) and four mutually exclusive outputs which are active LOW (O0 to O3). When used as a decoder, E when HIGH, forces O0 to O3 HIGH.
