The HCF4556B is a dual 1 to 4 decoder/demultiplexer available in DIP and SOP packages. Each decoder has two select inputs (A and B), an Enable input (E), and four mutually exclusive outputs. On the HCF4556B the outputs are low on select. When the Enable input is high, the outputs is high regardless of the state of the select inputs A and B.
The HCF4556B is a monolithic integrated circuit fabricated in Metal Oxide Semiconductor technology, available in DIP and SOP packages. It functions as a dual 1 of 4 decoder/demultiplexer where each decoder has two select inputs (A and B), an Enable input, and four mutually exclusive outputs that are low on select.
| Supply Voltage | 3 to 20 V |
|---|---|
| Operating Temperature | -55 to +125 °C |
| Input Leakage Current | 100nA (MAX) at VDD = 18V |
| Package Types | DIP and SOP |
| Logic Function | Dual 1 of 4 Decoder/Demultiplexer |
When the Enable input is high, the outputs are high regardless of the state of the select inputs A and B.
Yes, on the HCF4556B the outputs are low on select.
The noise margin for both "1" and "0" level is 1V minimum with VDD=5V.