NXP Semiconductors 74HCT4515N,652

Overview

74HCT4515N,652 from Nexperia is a 4-to-16 line inverting decoder/demultiplexer with input latches, operating at 4.5 V supply, featuring 26 ns typical propagation delay (An to Qn), standard output drive capability, and active-LOW mutually exclusive outputs (Q0–Q15). It serves as an address decoder in microcontroller peripheral expansion systems requiring stable latch-controlled selection.

For engineers reviewing the 74HCT4515N,652 datasheet, 74HCT4515N,652 pinout, 74HCT4515N,652 application, or 74HCT4515N,652 equivalent, key selection criteria include latch enable timing (tW ≥ 16 ns min), E-input propagation (18–60 ns), set-up/hold times for A0–A3 relative to LE, and compatibility with 5 V TTL-level control buses.

Technical Context

The 74HCT4515N,652 implements a CMOS-based 4-bit binary address decoder with transparent latching: when LE is HIGH, outputs follow A0–A3; when LE transitions LOW, the current address is latched and held regardless of subsequent address changes. Its inverting architecture ensures only one output (Q0–Q15) is LOW at any time under valid enable conditions.

It features three independent control paths - address-to-output (tPHL/tPLH = 30–69 ns), latch-enable-to-output (29–75 ns), and enable-input-to-output (18–60 ns) - all specified at VCC = 4.5 V and CL = 50 pF. The device complies with JEDEC Standard No. 7A and interfaces directly with TTL logic due to HCT-series input thresholds (VIH = 2.0 V min, VIL = 0.8 V max).

Key Specifications

Pinout & Package

74HCT4515N,652 is supplied in a 24-pin dual in-line package (DIP) with 0.600-inch body width and through-hole mounting. Pin pitch is 0.100 inch, and lead finish is matte tin.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar decoder/demultiplexer applications.

Compared with 74HCT4515N,652, the 74HCT154N,652 offers faster decode but lacks latching - increasing vulnerability to address glitches - while the SN74HCT4515N provides identical functionality with minor timing variances acceptable in most 5 V logic systems.

Availability

74HCT4515N,652 is available at Aetrix Electronics and suitable for memory address decoding, peripheral select logic, hexadecimal display driving, and BCD-to-16-line conversion requiring stable component supply and long-term industrial availability.

Supply support for 74HCT4515N,652 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global leader in high-performance discrete, logic, and power MOSFET semiconductors, serving automotive, industrial, computing, and consumer markets with AEC-Q101-qualified components and scalable manufacturing.

The 74HCT4515N,652 belongs to Nexperia's 74HCT logic family - engineered for robust 5 V TTL-compatible operation in noise-prone industrial environments and legacy system upgrades where latch-stabilized decoding is essential.

FAQ

What is the supply voltage range for the 74HCT4515N,652?

The 74HCT4515N,652 operates over a supply voltage range of 4.5 V to 5.5 V. This range ensures compatibility with standard 5 V TTL systems and provides margin against rail droop in industrial power supplies. Operation outside this range may result in undefined logic states or increased ICC, and is not guaranteed per the Nexperia datasheet.

How does the latch enable (LE) input affect output behavior in the 74HCT4515N,652?

When LE is HIGH, the 74HCT4515N,652 operates transparently: outputs Q0–Q15 respond immediately to changes on A0–A3. When LE transitions LOW, the current address is latched and held - outputs remain stable even if A0–A3 change afterward. This behavior makes the 74HCT4515N,652 ideal for use with multiplexed address buses where timing alignment is difficult.

Can the 74HCT4515N,652 be used as a demultiplexer, and how is that configured?

Yes - the 74HCT4515N,652 functions as a 1-to-16 demultiplexer when its active-LOW enable input (E) is used as the data input, and A0–A3 serve as address lines. With LE held HIGH, each rising/falling edge on E propagates to exactly one Qn output (determined by A0–A3), enabling precise routing of control or clock signals in test equipment or programmable logic interfaces.

What is the minimum required pulse width for the latch enable (LE) signal on the 74HCT4515N,652?

The minimum HIGH pulse width for LE on the 74HCT4515N,652 is 16 ns at VCC = 4.5 V and Tamb = +25 °C. At extended temperatures (−40 °C to +125 °C), the minimum widens to 24 ns. This specification ensures reliable capture of address data into the internal latches and must be met in all designs using the 74HCT4515N,652 in latched mode.

Are the outputs of the 74HCT4515N,652 truly mutually exclusive, and under what conditions?

Yes - the 74HCT4515N,652 guarantees mutually exclusive active-LOW outputs (Q0–Q15) only when E is LOW and the address inputs A0–A3 are in a valid binary state (0000–1111). If E is HIGH, all outputs go HIGH; if A0–A3 contain invalid states (e.g., floating or undefined), multiple outputs may activate unpredictably. Proper pull-up/pull-down biasing of address lines is required to ensure exclusivity in the 74HCT4515N,652.