Texas Instruments CD74HC4514E

Overview

CD74HC4514E from Texas Instruments is a high-speed CMOS 4-to-16 line decoder/demultiplexer with input latches, operating from 2V to 6V, featuring 16 active-high outputs, -55°C to +125°C temperature range, and propagation delay of 47ns (typ) at VCC = 6V. It serves as a binary-to-1-of-16 decoder or 1-to-16 demultiplexer in address decoding and data routing applications.

For engineers reviewing the CD74HC4514E datasheet, CD74HC4514E pinout, CD74HC4514E application, or CD74HC4514E equivalent, key selection considerations include latch-enable timing (tSU = 17ns min at 6V), E-input demux functionality, output drive capability (10 LSTTL loads), and PDIP-24 package compatibility with legacy through-hole designs.

Technical Context

The CD74HC4514E integrates a 4-bit strobed latch and a 4-to-16 decoder in a single monolithic IC. Its latch enable (LE) controls transparent vs. latched operation: when LE is high, outputs follow A0–A3 inputs; when LE is low, outputs hold their prior state (high for CD74HC4514E, low for CD74HC4515 variants).

Demultiplexing is implemented by using the E input as data and A0–A3 as address lines; E also functions as chip select during cascading. The device exhibits balanced propagation delay (tPHL/tPLH ≤ 71ns max at 6V, -55°C to +125°C) and transition times (tTHL/tTLH ≤ 19ns max at 6V), enabling reliable high-speed logic interfacing.

Key Specifications

Pinout & Package

CD74HC4514E uses a 24-pin Plastic Dual-In-Line Package (PDIP) with 0.600-inch body width and standard through-hole footprint. Pin 1 is located at the top-left corner adjacent to the notch or dot marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD74HC4514E, CD74HC4515E provides identical timing and drive strength but inverted output polarity, while SN74HC154N removes latch control entirely - trading robustness for simplicity in static address systems.

Availability

CD74HC4514E is available at Aetrix Electronics and suitable for industrial control systems, test equipment design, and aerospace avionics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC4514E 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 logic solutions, with decades of heritage in high-reliability logic families.

The CD74HC4514E belongs to TI's HC (High-Speed CMOS) logic family, designed for low-power, high-noise-immunity digital interfacing in demanding industrial and military applications.

FAQ

What is the maximum clock frequency supported by CD74HC4514E in demultiplexer mode?

The CD74HC4514E does not operate as a clocked device in demultiplexer mode; its speed is governed by propagation delay. With tPHL/tPLH ≤ 71ns (max) at VCC = 6V and -55°C to +125°C, the CD74HC4514E supports reliable data rates up to approximately 14 MHz for E-input toggling, assuming clean edges and proper load capacitance (≤50pF).

Can CD74HC4514E drive LEDs directly without current-limiting resistors?

No - CD74HC4514E outputs are not designed for direct LED drive without external current limiting. Each output can sink or source up to ±25mA, but sustained operation above 6mA risks exceeding recommended IO limits. Always use series resistors (e.g., 330Ω for 5V supply) to limit current to ≤6mA per CD74HC4514E output.

How does the latch enable (LE) pin affect output behavior during address changes?

When LE is high, CD74HC4514E outputs follow A0–A3 inputs in real time - transient address glitches may cause spurious output transitions. When LE is low, outputs freeze at their last valid state, eliminating glitches during address bus settling. This makes CD74HC4514E ideal for synchronous systems where address stability must precede output activation.

Is CD74HC4514E pin-compatible with CD74HC4515E?

Yes - CD74HC4514E and CD74HC4515E share identical pinout, package, timing, and DC specifications; the sole functional difference is output polarity (active-high vs. active-low). They are mechanically and electrically interchangeable on PCBs, though logic-level inversion must be accounted for in firmware or downstream circuitry.

What is the purpose of the E input beyond enabling/disabling outputs?

Beyond enabling/disabling, the E input serves as the data path in demultiplexer mode: when A0–A3 define the address, E becomes the routed signal - a high on E asserts the selected Yx output, while a low deasserts it. This allows CD74HC4514E to function as a 1-to-16 signal switch, useful in data distribution, test signal routing, and programmable logic interconnects.