Texas Instruments CD74HC4514ENG4

Overview

CD74HC4514ENG4 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 - used in address decoding for memory expansion and I/O port selection in embedded controllers.

For engineers reviewing the CD74HC4514ENG4 datasheet, CD74HC4514ENG4 pinout, CD74HC4514ENG4 application, or CD74HC4514ENG4 equivalent, key selection criteria include latch-controlled input staging, E-input dual-role as data input (demux mode) or chip select (cascaded decode), output drive capability (10 LSTTL loads), propagation delay (max 83 ns at VCC = 4.5V), and PDIP-24 package compatibility with legacy through-hole systems.

Technical Context

The CD74HC4514ENG4 integrates a 4-bit strobed latch followed by a 4-to-16 line decoder. Input latching is controlled by LE: when high, outputs follow A0–A3 changes; when low, outputs hold prior state (high for CD74HC4514). The E input enables or inhibits all outputs (low = enabled), and serves as data input in demultiplexer mode.

Its logic family is HC-type CMOS, offering high noise immunity (NIL/NIH = 30% of VCC at 5V), balanced transition times, and significant power reduction versus LSTTL. It meets absolute maximum ratings including ±25mA per output, -0.5V to 7V supply, and 150°C max junction temperature.

Key Specifications

Pinout & Package

CD74HC4514ENG4 is supplied in a 24-pin plastic dual in-line package (PDIP), with 0.300-inch body width, through-hole mounting, and industry-standard pin spacing (0.100 inch). Pin 1 is located at the top-left corner with 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 CD74HC4514ENG4, CD74HC4515EN provides complementary output polarity without altering timing or packaging, while SN74HC154N removes latching to reduce latency at the cost of synchronous input control - making each alternative optimal only for specific architectural constraints in address/data routing subsystems.

Availability

CD74HC4514ENG4 is available at Aetrix Electronics and suitable for memory address decoding, I/O port expansion, cascaded decoder systems, and industrial control logic requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC4514ENG4 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 founded in 1930, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

CD74HC4514ENG4 belongs to TI's HC-series high-speed CMOS logic family, designed specifically for drop-in replacement of LSTTL in legacy systems while delivering lower power, wider voltage tolerance, and enhanced noise immunity.

FAQ

What is the function of the LE pin on the CD74HC4514ENG4?

The LE (Latch Enable) pin controls input sampling behavior: when high, the CD74HC4514ENG4 operates transparently - Y0–Y15 follow A0–A3 changes in real time; when low, it latches and holds the last valid A0–A3 value, freezing output states regardless of subsequent input transitions. This enables synchronized address capture aligned with system clock edges or bus strobes, critical for reliable memory mapping in microcontroller systems.

Can CD74HC4514ENG4 operate at 3.3V supply voltage?

Yes, CD74HC4514ENG4 supports 2V to 6V operation, making it fully compatible with 3.3V systems. At VCC = 3.3V, VIH is guaranteed ≥2.0V and VIL ≤1.0V, providing robust noise margins. Propagation delay increases slightly versus 5V operation (e.g., ~65 ns max E→Y at 3.3V, CL = 50pF), but remains within specification for most embedded timing budgets.

How does the E input function differently in decoder vs. demultiplexer mode for CD74HC4514ENG4?

In decoder mode, E acts as an active-low chip enable: only when E = low do outputs respond to A0–A3; E = high forces all Y0–Y15 low. In demultiplexer mode, E becomes the serial data input - its logic level is routed to the selected output (determined by A0–A3), while unselected outputs remain low. This dual role eliminates need for external gating in data distribution architectures.

What is the maximum output sink/source current per pin for CD74HC4514ENG4?

CD74HC4514ENG4 guarantees ±25mA DC output current per pin under specified conditions (VO between -0.5V and VCC + 0.5V). However, total device ICC is limited to ±50mA - meaning simultaneous drive of multiple outputs must stay within aggregate current limits. For sustained 10 LSTTL load driving (≈1.6mA per load), all 16 outputs can be active without exceeding safe operating area.

Is CD74HC4514ENG4 pin-compatible with CD74HC4515EN?

Yes, CD74HC4514ENG4 and CD74HC4515EN share identical pinout, package (PDIP-24), electrical specifications, and functional block diagram - differing only in output polarity: CD74HC4514ENG4 asserts Y0–Y15 high on match, while CD74HC4515EN asserts them low. This makes them direct drop-in replacements where logic inversion is acceptable or compensated externally.