1. General description
The HEF4555B contains two 1-of-4 decoders/demultiplexers. Each has two address inputs (nA0
and nA1, an active LOW enable input (nE) and four mutually exclusive outputs which are active
HIGH (nY0 to nY3). When used as a decoder, nE when HIGH, forces nY0 to nY3 LOW. When used
as a demultiplexer, the appropriate output is selected by the information on nA0 and nA1 with nE
as data input. All unselected outputs are LOW.
It operates over a recommended VDD power supply range of 3 V to 15 V referenced to VSS (usually
ground). Unused inputs must be connected to VDD, VSS, or another input.
2. Features and benefits
• Wide supply voltage range from 3.0 V to 15.0 V
• CMOS low power dissipation
• High noise immunity
• Fully static operation
• 5 V, 10 V, and 15 V parametric ratings
• Standardized symmetrical output characteristics
• Complies with JEDEC standard JESD 13-B
• ESD protection:
• HBM JESD22-A114F exceeds 2000 V
• MM JESD22-A115-B exceeds 200 V
• Specified from -40 °C to +85 °C
3. Applications
• Code conversion
• Address decoding
• Demultiplexing: when using the enable input as data input