The HEF4555BT,652 is an Integrated Circuit (IC) component manufactured by NXP Semiconductors. It is a dual 1-of-4 decoder/demultiplexer with input latches. Here is an overview of its key features:
1. Dual Functionality: The HEF4555BT,652 consists of two identical 1-of-4 decoders/demultiplexers in a single package. Each decoder has four inputs (A0-A3) and two outputs (Y0-Y3) along with an enable input (E1 or E2) which activates the decoder operation.
2. Input Latches: This IC has input latches for both decoders. These latches allow storing the input data, which eliminates the need for simultaneous data availability during data decoding. Signals on the latch enable inputs (LE1 and LE2) determine the latching (storing) or non-latching (transparent) operation of the respective input latches.
3. Decoding Function: Each decoder/demultiplexer in the IC accepts a 4-bit binary input (A0-A3) and decodes it to one of the four active-low outputs (Y0-Y3) based on the selected enable signal (E1 or E2). The output corresponding to the active input line will be set low, while the remaining outputs will remain high
