Texas Instruments CD74HC4515M96

Overview

CD74HC4515M96 from Texas Instruments is a high-speed CMOS 4-to-16 line decoder/demultiplexer with input latches, functioning as a binary-to-1-of-16 decoder or 1-to-16 line demultiplexer. It features active-low enable (E), latch-enable (LE), four address inputs (A0–A3), and sixteen active-low outputs (Y0–Y15). Operates from 2V to 6V with propagation delay as low as 30ns at 6V and supports industrial temperature range –55°C to +125°C. Used in address decoding for memory expansion and I/O port selection in embedded control systems.

For engineers reviewing the CD74HC4515M96 datasheet, CD74HC4515M96 pinout, CD74HC4515M96 application, or CD74HC4515M96 equivalent, key selection considerations include its active-low output logic (Yx = LOW when selected), latch-controlled input sampling, E-as-data demux mode, and SOIC-24 packaging for space-constrained PCB layouts.

Technical Context

The CD74HC4515M96 integrates a 4-bit strobed latch and a 4-to-16 decoder in a single silicon gate CMOS device. Its latch enables synchronous input capture on LE high, holding prior state when LE is low - with outputs latched LOW (unlike CD74HC4514's HIGH-active latched outputs). The E input serves dual roles: chip enable (active-low) and data input for demultiplexing.

Logic behavior is defined by truth table where only one Yx output goes LOW per valid A3–A0 combination when E = LOW; all outputs remain HIGH when E = HIGH. Propagation delays are specified across voltage (2V/4.5V/6V) and temperature (–55°C to +125°C), with tPHL/tPLH ≤ 71ns at 6V and CL = 50pF, ensuring timing predictability in synchronous digital systems.

Key Specifications

Pinout & Package

CD74HC4515M96 is housed in a 24-pin SOIC (DW) package, 7.5mm wide, with standard 1.27mm pitch and RoHS-compliant NiPdAu lead finish. Moisture sensitivity level is Level-1 (unlimited floor life at ≤30°C/60% RH).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD74HC4514M96, CD74HC4515M96 provides complementary active-low output behavior essential for sinking loads, while SN74LVCH16244ADGGR offers no decoding capability and demands additional logic - making CD74HC4515M96 the optimal choice for self-contained 4-to-16 decode/demux with latch control.

Availability

CD74HC4515M96 is available at Aetrix Electronics and suitable for memory address decoding, I/O port expansion, LED matrix row selection, and test equipment signal routing requiring stable component supply across extended temperature ranges.

Supply support for CD74HC4515M96 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 over 50 years of innovation in high-reliability logic families.

CD74HC4515M96 belongs to TI's HC (High-Speed CMOS) logic portfolio, designed for low-power, high-noise-immunity digital interfacing in industrial, aerospace, and automotive systems demanding wide temperature operation.

FAQ

What is the key functional difference between CD74HC4515M96 and CD74HC4514M96?

The CD74HC4515M96 features active-low outputs (Yx = LOW when selected), whereas CD74HC4514M96 has active-high outputs (Yx = HIGH when selected). Both share identical pinout, timing, latch behavior, and electrical specs. This polarity difference determines load interface: CD74HC4515M96 sinks current for LED cathodes or reset lines, while CD74HC4514M96 sources current for LED anodes or enable lines. The CD74HC4515M96 is not a drop-in replacement for CD74HC4514M96 without logic inversion in the system.

Does CD74HC4515M96 support 3.3V operation, and what are the timing implications?

Yes, CD74HC4515M96 operates from 2V to 6V, fully supporting 3.3V nominal supply. At VCC = 3.3V, propagation delay is typically 69ns (max 83ns) and output transition time is ≤22ns (max) under CL = 50pF conditions. Input thresholds scale proportionally (VIH ≈ 2.31V, VIL ≈ 0.99V), ensuring compatibility with 3.3V CMOS logic families. No level shifters are needed for interfacing with 3.3V microcontrollers or FPGAs.

How does the latch enable (LE) pin affect output behavior in CD74HC4515M96?

When LE is HIGH, CD74HC4515M96 operates in transparent mode: outputs respond immediately to changes in A3–A0 and E. When LE transitions LOW, the internal latch freezes the last valid decoded state, holding all Yx outputs at their prior levels (LOW for selected line, HIGH for unselected) regardless of subsequent address changes. This allows asynchronous address updates without glitches - critical for reliable memory or peripheral selection in real-time systems using CD74HC4515M96.

Can CD74HC4515M96 be used as a 1-to-16 demultiplexer, and how is that configured?

Yes, CD74HC4515M96 functions as a 1-to-16 demultiplexer by using the E pin as the data input and A3–A0 as the 4-bit channel select address. With LE held HIGH, each rising/falling edge on E propagates to exactly one Yx output determined by the current A3–A0 state. Since outputs are active-low, E = LOW routes logic LOW to the selected Yx; E = HIGH routes logic HIGH (all Yx HIGH). This configuration requires no external logic and maintains full timing spec compliance per the CD74HC4515M96 datasheet.

What is the maximum output sink current per pin for CD74HC4515M96 at 6V supply?

CD74HC4515M96 guarantees ±25mA DC output sink/source current per pin (IO) across –55°C to +125°C, with VOL ≤ 0.1V at IO = 0.02mA (CMOS load) and ≤ 0.4V at IO = 5.2mA (TTL load) under VCC = 6V. Real-world sustained sink capability is 25mA per output, enabling direct drive of LEDs, small relays, or MOSFET gates without external buffers - verified in TI's official datasheet revision July 2003 (SCHS280C) for CD74HC4515M96.