Texas Instruments CD74HCT154M96

Overview

CD74HCT154M96 from Texas Instruments is a 4-to-16-line decoder/demultiplexer with dual enable inputs (E1, E2), operating at 4.5V–5.5V, supporting LSTTL-compatible logic levels (VIL ≤ 0.8V, VIH ≥ 2.0V), and rated for -55°C to +125°C operation in a 24-pin SOIC package. It performs address decoding in industrial control backplanes and enables data routing in high-reliability multiplexed I/O systems.

For engineers reviewing the CD74HCT154M96 datasheet, CD74HCT154M96 pinout, CD74HCT154M96 application, or CD74HCT154M96 equivalent, key selection criteria include its HCT-family TTL-compatible input thresholds, 53 ns max propagation delay at -55°C to +125°C, dual-enable demultiplexing capability, 24-pin SOIC thermal resistance (θJA = 46°C/W), and tape-and-reel packaging for automated assembly.

Technical Context

The CD74HCT154M96 implements combinational logic decoding using four binary address inputs (A0–A3) to assert exactly one of sixteen active-low outputs (Y0–Y15), with output state determined by the logical AND of both enables (E1 = L, E2 = L) and the decoded address. Its architecture supports cascading via enable chaining and demultiplexing by treating one enable as data input while holding the other low.

It uses CMOS circuitry with bipolar-compatible input stages to achieve LSTTL-level compatibility without external level-shifting, and features balanced tPLH/tPHL propagation delays (≤53 ns over full temperature range) and fast output transition times (≤22 ns) under 50 pF load - critical for synchronous bus decoding in deterministic real-time systems.

Key Specifications

Pinout & Package

CD74HCT154M96 is housed in a 24-pin Small Outline Integrated Circuit (SOIC) package (TI package code DW), with 0.300-inch body width, gull-wing leads, and RoHS-compliant NiPdAu lead finish. The package supports reflow per JEDEC Level-1 (260°C peak), and is supplied in 2000-unit tape-and-reel format (reel diameter 330 mm, width 24.4 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT154DR, CD74HCT154M96 offers identical functionality and qualification but reflects an earlier TI production revision; versus 74ACT154SCX, it trades raw speed for guaranteed TTL interoperability and lower design complexity in mixed-logic systems.

Availability

CD74HCT154M96 is available at Aetrix Electronics and suitable for industrial PLC backplanes, military data bus multiplexing, and automotive engine control unit I/O expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HCT154M96 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and aerospace markets since 1930.

The CD74HCT154M96 belongs to TI's High-Speed CMOS Logic (HCT) family, engineered specifically for seamless integration between legacy TTL systems and modern CMOS-based controllers in harsh-environment applications.

FAQ

What is the maximum propagation delay of the CD74HCT154M96 across its full operating temperature range?

The CD74HCT154M96 exhibits a maximum propagation delay of 53 ns from any address input (A0–A3) or enable input (E1/E2) to an output (Y0–Y15), measured at VCC = 4.5 V, CL = 50 pF, and over the full -55°C to +125°C temperature range. This value is specified in the official TI datasheet SCHS152D and applies to both HC and HCT variants under worst-case conditions.

Does the CD74HCT154M96 require external pull-up resistors on its outputs?

No, the CD74HCT154M96 does not require external pull-up resistors on its outputs. Its outputs are active-low, push-pull CMOS drivers capable of sinking up to 25 mA per pin and sourcing limited current through the internal PMOS device. Pull-ups are unnecessary unless interfacing with open-collector systems or implementing wired-OR logic - which is not supported by this device's architecture.

Can the CD74HCT154M96 be used as a 1-to-16 demultiplexer, and how is that configured?

Yes, the CD74HCT154M96 can operate as a 1-to-16 demultiplexer. Configure it by holding one enable input (e.g., E2) low, applying the data signal to the other enable (E1), and using A0–A3 as the 4-bit select lines. When E2 = L and E1 transitions, exactly one of Y0–Y15 follows E1's state (active-low), effectively routing the input signal to the selected output - a configuration explicitly described in the functional description of the CD74HCT154M96 datasheet.

Is the CD74HCT154M96 pin-compatible with the CD74HC154M96?

Yes, the CD74HCT154M96 is pin-compatible with the CD74HC154M96: both share identical 24-pin SOIC (DW) packaging, identical pinout (including VCC, GND, A0–A3, E1, E2, Y0–Y15), and identical footprint. However, they differ electrically - CD74HC154M96 operates from 2 V to 6 V with CMOS input thresholds, while CD74HCT154M96 is restricted to 4.5 V–5.5 V with TTL-compatible inputs.

What is the meaning of the "96" suffix in CD74HCT154M96?

The "96" suffix in CD74HCT154M96 denotes tape-and-reel packaging: the device is supplied in a 2000-unit reel format compliant with EIA-481 standards, optimized for automated SMT placement. This distinguishes it from the tube-packaged CD74HCT154M (no suffix) and confirms RoHS compliance, NiPdAu lead finish, and JEDEC Level-1 moisture sensitivity rating per TI's packaging documentation.