Texas Instruments CD54HC4514F3A

Overview

CD54HC4514F3A from Texas Instruments is a high-speed CMOS 4-to-16 line decoder/demultiplexer with input latches, operating from 2V to 6V supply, featuring -55°C to +125°C temperature range, 47ns max propagation delay at 6V (CL = 50pF), and 16 active-high decoded outputs (Y0–Y15). It serves as a binary address decoder in military-grade memory addressing and bus selection systems.

For engineers reviewing the CD54HC4514F3A datasheet, CD54HC4514F3A pinout, CD54HC4514F3A application, or CD54HC4514F3A equivalent, key selection criteria include latch-enable timing (tSU = 26ns min at -55°C to +125°C), E-input demux capability, CERDIP package hermeticity, and compatibility with LSTTL fanout (10 loads).

Technical Context

The CD54HC4514F3A integrates a 4-bit strobed latch and a 4-to-16-line decoder in a single monolithic silicon gate CMOS device. Its latch enable (LE) controls transparent vs. latched input behavior, while the enable input (E) functions as both output enable and data input for demultiplexing - enabling 1-to-16 signal routing when A0–A3 serve as address lines.

It supports dual functional modes: binary decoding (with E low) and demultiplexing (with E as data input), with output polarity fixed as active-high (Y0–Y15 = HIGH on match). All timing parameters - including LE-to-output (58ns max at 6V, -55°C to +125°C) and E-to-output (45ns max) - are fully specified across the full military temperature range.

Key Specifications

Pinout & Package

CD54HC4514F3A uses a 24-lead CERDIP (Ceramic Dual-In-Line Package) with hermetic sealing, 0.600-inch body width, and standard 0.100-inch lead pitch. Pin 1 index is marked via cap lens or notch per MCDI004A mechanical drawing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD74HC4514M96 and SN74ACT154N, the CD54HC4514F3A uniquely combines military temperature range, hermetic CERDIP packaging, integrated latch, and dual decode/demux functionality - making it irreplaceable in mission-critical embedded systems where reliability trumps raw speed or cost.

Availability

CD54HC4514F3A is available at Aetrix Electronics and suitable for aerospace avionics, defense electronics, and industrial control systems requiring stable component supply across extended temperature extremes and long product lifecycles.

Supply support for CD54HC4514F3A 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 specializing in analog, embedded processing, and high-reliability logic solutions, with decades of heritage in military-qualified IC development.

The CD54HC4514F3A belongs to TI's CD54HC high-speed CMOS logic family, designed specifically for ruggedized digital systems demanding wide temperature operation, low power, and compatibility with legacy TTL interfaces.

FAQ

What is the maximum clock frequency supported by CD54HC4514F3A in demultiplexer mode?

The CD54HC4514F3A does not operate on a clock signal - it is combinational logic with latch control. In demux mode, its maximum data rate is determined by propagation delay: at 6V and -55°C to +125°C, E-to-Y delay is 45ns max, supporting up to ~22 MHz toggle rate under ideal loading. Real-world limits depend on trace capacitance and fanout.

Can CD54HC4514F3A replace a 74LS154 in an existing design?

Yes, CD54HC4514F3A is a functional and pin-compatible replacement for 74LS154 in most cases: same 24-pin CERDIP footprint, identical pinout (including Y0–Y15, A0–A3, E, LE, GND, VCC), and compatible 5V operation. However, note that CD54HC4514F3A has active-high outputs versus 74LS154's active-low - external inverters may be needed unless downstream logic accommodates polarity change.

Does CD54HC4514F3A support 3.3V operation?

Yes, CD54HC4514F3A is fully specified for 2V to 6V operation, including 3.3V nominal supply. At VCC = 3.3V, VIH = 2.31V min and VIL = 1.09V max ensure reliable interfacing with 3.3V microcontrollers and FPGAs; propagation delay increases to 71ns max (CL = 50pF, -55°C to +125°C), remaining within most timing budgets.

What is the purpose of the Latch Enable (LE) pin on CD54HC4514F3A?

The LE pin controls input sampling behavior: when LE = HIGH, outputs follow A0–A3 changes in real time (transparent mode); when LE = LOW, outputs hold their last state regardless of input changes (latched mode). This enables synchronous address capture aligned to system clocks - critical for avoiding glitches during bus arbitration or memory access cycles in the CD54HC4514F3A.

Is CD54HC4514F3A RoHS compliant?

No, CD54HC4514F3A is not RoHS compliant - its CERDIP package uses leaded solder and is designated "No" under RoHS in TI's packaging addendum. It is intended for military, aerospace, and legacy industrial applications where exemption from RoHS is permitted. For RoHS-compliant alternatives, consider CD74HC4514M96 (SOIC-24, lead-free NiPdAu finish).