Texas Instruments CD74HC4514ME4

Overview

CD74HC4514ME4 from Texas Instruments is a high-speed CMOS 4-to-16 line decoder/demultiplexer with input latches, functioning as both binary-to-1-of-16 decoder and 1-to-16 line demultiplexer. It operates from 2V to 6V, features latch enable (LE) and enable (E) control inputs, delivers 16 active-high decoded outputs (Y0–Y15), and supports -55°C to +125°C industrial/military temperature range. It is used in address decoding for memory expansion and I/O port selection in embedded control systems.

For engineers reviewing the CD74HC4514ME4 datasheet, CD74HC4514ME4 pinout, CD74HC4514ME4 application, or CD74HC4514ME4 equivalent, key selection considerations include its strobed latch architecture, E-input dual-role as data input (demux mode) or chip select (cascaded decode mode), output drive capability (10 LSTTL loads), and guaranteed propagation delay ≤83 ns at VCC = 4.5V over full temperature range.

Technical Context

The CD74HC4514ME4 integrates a 4-bit strobed latch and a 4-to-16 line decoder in a single SOIC-24 package. Its latch enable (LE) controls transparent vs. latched operation: when LE is high, outputs follow A0–A3 inputs; when LE is low, outputs hold prior state (Yx = HIGH for CD74HC4514). The enable input (E) gates all outputs - low enables decoding/demuxing, high forces all outputs LOW.

Demultiplexing is implemented by routing data to E while using A0–A3 as address lines; cascading is supported via E as chip-select. Propagation delays are specified separately for select-to-output (≤83 ns), LE-to-output (≤68 ns), and E-to-output (≤53 ns) paths at VCC = 4.5V and CL = 50 pF, confirming deterministic timing for synchronous logic interfacing.

Key Specifications

Pinout & Package

CD74HC4514ME4 is housed in a 24-pin SOIC (DW) package with standard 0.300-inch body width, gull-wing leads, and RoHS-compliant NiPdAu finish. Pin 1 is located at the top-left corner with quadrant Q1 orientation in tape-and-reel delivery.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-to-16 decoder/demultiplexer applications.

Compared with SN74HC154N and CD74HC4515M96, the CD74HC4514ME4 uniquely combines latched inputs, active-HIGH outputs, and E-input dual-mode operation - making it the only option among the three for time-critical, latch-synchronized demultiplexing in mixed-polarity systems.

Availability

CD74HC4514ME4 is available at Aetrix Electronics and suitable for memory address decoding, I/O port expansion, industrial PLC backplane management, and automated test equipment signal routing requiring stable component supply across extended temperature and voltage ranges.

Supply support for CD74HC4514ME4 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

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and logic solutions with emphasis on reliability, longevity, and industrial-grade qualification.

The CD74HC4514ME4 belongs to TI's legacy HC logic family, designed specifically for high-noise-immunity, wide-temperature digital interfacing in mission-critical control and instrumentation systems.

FAQ

What is the function of the LE pin on the CD74HC4514ME4?

The LE (Latch Enable) pin on the CD74HC4514ME4 controls whether the internal 4-bit latch is transparent or holding. When LE is HIGH, outputs Y0–Y15 follow changes on address inputs A0–A3 in real time. When LE is LOW, the latch freezes the last valid output state - a critical feature for synchronizing address decoding with clock edges in microcontroller or FPGA systems. This behavior is explicitly defined in the truth table and functional diagram of the CD74HC4514ME4 datasheet.

Can the CD74HC4514ME4 be used as a demultiplexer?

Yes, the CD74HC4514ME4 can operate as a 1-to-16 demultiplexer by applying the data signal to the E (Enable) input and using A0–A3 as the 4-bit address. When E is HIGH, all outputs are forced LOW; when E is LOW, the addressed output (Y0–Y15) goes HIGH. This dual-mode capability - decoder and demux - is a documented feature of the CD74HC4514ME4 and eliminates the need for separate demux ICs in space-constrained designs.

What is the maximum operating frequency supported by the CD74HC4514ME4?

The CD74HC4514ME4 does not specify a maximum clock frequency directly, but its propagation delay limits practical switching rates. With a maximum select-to-output delay of 83 ns at VCC = 4.5V and CL = 50 pF, the device supports reliable operation up to approximately 12 MHz in address decode applications. This value is derived from the worst-case tPLH/tPHL specifications in the CD74HC4514ME4 datasheet under industrial temperature conditions.

Is the CD74HC4514ME4 pin-compatible with the CD74HC4515M96?

Yes, the CD74HC4514ME4 is pin-compatible with the CD74HC4515M96 - both are 24-pin SOIC devices with identical pin assignments, electrical characteristics, and timing parameters. The sole functional difference is output polarity: CD74HC4514ME4 asserts selected outputs HIGH, while CD74HC4515M96 asserts them LOW. This makes them direct drop-in alternatives where output logic level matches system requirements.

What package type is used for the CD74HC4514ME4?

CD74HC4514ME4 uses a 24-pin SOIC (Small Outline Integrated Circuit) package designated as DW by Texas Instruments, with 0.300-inch body width, gull-wing leads, and RoHS-compliant NiPdAu surface finish. This package is distinct from the PDIP (E/EN) and CERDIP (F3A) variants and is optimized for automated SMT assembly and high-density PCB layouts.