Texas Instruments CD74HC4514EN

Overview

CD74HC4514EN 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 -55°C to +125°C temperature range, and delivers 47ns max propagation delay at 6V (CL = 50pF), enabling precise address decoding in industrial control backplanes.

For engineers reviewing the CD74HC4514EN datasheet, CD74HC4514EN pinout, CD74HC4514EN application, or CD74HC4514EN equivalent, key selection criteria include latch-enable timing (19ns min LE setup at 6V), E-input dual-role as enable/data input, output drive capability (10 LSTTL loads), and PDIP-24 package compatibility with legacy through-hole test fixtures.

Technical Context

The CD74HC4514EN integrates a 4-bit strobed latch and 4-to-16 decoder in a single monolithic silicon gate structure. 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 (high for CD74HC4514EN, low for CD74HC4515 variants).

Demultiplexing is implemented by routing data to the E input while using A0–A3 as address lines; cascading is supported via E as chip select. The device exhibits balanced tPHL/tPLH transition times and achieves significant power reduction versus LSTTL logic ICs under identical loading conditions.

Key Specifications

Pinout & Package

CD74HC4514EN uses a 24-pin plastic dual in-line package (PDIP) with 0.3-inch body width and standard through-hole footprint. 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 SN74HC154N, CD74HC4514EN trades 5ns speed for integrated latching functionality; compared with CD74HC4515EN, it provides complementary output polarity for direct interface with TTL-compatible inputs without inverters.

Availability

CD74HC4514EN is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and aerospace avionics backplanes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC4514EN 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 company founded in 1930, specializing in analog, embedded processing, and logic ICs with broad industrial and automotive qualification.

The CD74HC4514EN belongs to TI's HC-series high-speed CMOS logic family, designed specifically for drop-in replacement of LS-TTL in legacy systems while delivering lower power and wider voltage operation.

FAQ

What is the maximum clock frequency supported by CD74HC4514EN in demultiplexer mode?

The CD74HC4514EN does not operate as a clocked device in demultiplexer mode; its maximum data rate depends on propagation delay and input rise/fall times. With 400ns max input transition time at 6V and 45ns E→Y propagation, CD74HC4514EN supports reliable demux operation up to 10MHz for clean digital signals under load. System-level timing must account for worst-case setup/hold requirements of the E input relative to address changes.

Can CD74HC4514EN drive LEDs directly without current-limiting resistors?

No, CD74HC4514EN cannot drive LEDs directly without external current-limiting resistors. Its absolute maximum output sink/source current is ±25mA per pin, but recommended operating conditions specify ≤20mA for reliability. Driving even a standard 2V, 20mA LED at 5V would require a minimum 150Ω series resistor to limit current to safe levels and prevent output voltage droop or thermal overstress.

How does the latch enable (LE) function differ between CD74HC4514EN and CD74HC4515EN?

The latch enable (LE) function is identical between CD74HC4514EN and CD74HC4515EN: LE high enables transparent operation, LE low holds the last decoded output state. The only functional difference is output polarity - CD74HC4514EN outputs go high when selected, while CD74HC4515EN outputs go low. Both share identical pinout, timing, and latch behavior, making them drop-in replacements except for polarity-critical interfaces.

Is CD74HC4514EN compatible with 3.3V microcontrollers without level shifting?

Yes, CD74HC4514EN is fully compatible with 3.3V microcontrollers. Its VIH minimum is 2.1V at 3.3V VCC (70% of VCC), and VIL maximum is 0.99V - well within standard 3.3V CMOS logic thresholds. When powered at 3.3V, CD74HC4514EN delivers rail-to-rail output swing and meets all AC/DC specifications, enabling direct connection to 3.3V address/data buses without translation circuitry.

What is the thermal resistance (θJA) of the CD74HC4514EN PDIP package?

The CD74HC4514EN in PDIP package has a typical junction-to-ambient thermal resistance (θJA) of 67°C/W, measured per JESD 51-3 standards on a 1-inch² copper pad with 2oz copper thickness. This value assumes standard JEDEC test board conditions; actual θJA in end equipment will vary based on PCB layout, airflow, and nearby heat sources. At 160µA quiescent current and 20mA output loading, self-heating remains negligible below 85°C ambient.