NXP 74HC4514PW: 4-to-16 Line Decoder/Demultiplexer with Latch and Input Pinout Guide

The NXP 74HC4514PW is a high-speed CMOS integrated circuit that functions as a 4-to-16 line decoder/demultiplexer, equipped with an internal input latch. This device is engineered to decode four binary-coded inputs (A0 to A3) into one of sixteen mutually exclusive active-HIGH outputs (Q0 to Q15). A key feature of this IC is its integrated latch, which allows the input states to be stored upon command, ensuring stable output even if the input data changes. This makes it exceptionally useful in applications requiring data retention, such as memory address decoding, data routing, and complex digital control systems.

Housed in a TSSOP-24 (Thin Shrink Small Outline Package), the 74HC4514PW offers a compact footprint suitable for space-constrained PCB designs. The device includes two primary control pins: the Latch Enable (LE) and the Output Enable (OE). When LE is held HIGH, the latch is transparent, and the outputs respond directly to the inputs. A HIGH-to-LOW transition on LE latches (stores) the current input data. The OE pin, when set HIGH, forces all outputs to a LOW state, regardless of the input or latch status, providing a safe tri-state mode for bus-oriented applications.

A precise understanding of the pinout configuration is critical for successful implementation. The four address inputs (A0, A1, A2, A3) are located on specific pins, while the sixteen outputs are arranged across the package. The device requires a power supply (VCC) between 2.0 and 6.0 volts, aligning with standard HC logic family specifications.

ICGOODFIND: The 74HC4514PW is a robust and versatile decoder/demultiplexer solution. Its integrated storage latch and output enable function provide critical control for dynamic digital systems, making it a superior choice over basic decoder ICs for applications demanding data stability and efficient bus management.

Keywords: Decoder/Demultiplexer, Input Latch, TSSOP-24, Output Enable, Address Decoding.