Texas Instruments CD74HCT253M96

Overview

CD74HCT253M96 from Texas Instruments is a dual 4-to-1 line selector/multiplexer with three-state outputs, designed for digital signal routing in bus-oriented systems. It operates from 4.5 V to 5.5 V, features common S0/S1 select inputs, independent 1OE/2OE enable controls, and delivers propagation delays as low as 38 ns (data-to-output, VCC = 4.5 V, CL = 50 pF) in industrial temperature range (-55°C to +125°C).

For engineers reviewing the CD74HCT253M96 datasheet, CD74HCT253M96 pinout, CD74HCT253M96 application, or CD74HCT253M96 equivalent, key selection criteria include LSTTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), high-noise-immunity CMOS inputs (II ≤ 1 µA), three-state bus-driving capability, and SOIC-16 packaging suitable for high-density PCB layouts.

Technical Context

The CD74HCT253M96 implements two independent 4-input multiplexers sharing S0 and S1 select lines, with each section controlled by its own output-enable (1OE, 2OE). When OE is HIGH, the corresponding Y output enters high-impedance state-enabling bidirectional bus arbitration without external logic.

Its HCT logic family ensures direct compatibility with legacy LSTTL outputs while maintaining CMOS power efficiency: quiescent ICC ≤ 160 µA over full temperature range, and dynamic power governed by CPD = 52 pF at VCC = 5 V. Input hysteresis is not specified; noise immunity derives from fixed VIH/VIL thresholds referenced to VCC.

Key Specifications

Pinout & Package

CD74HCT253M96 is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package (Package Drawing D), 7.5 mm × 10.3 mm body, 1.27 mm pitch, RoHS-compliant, moisture sensitivity level 1 (MSL-1), tape-and-reel format (2500 units/reel).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 4:1 multiplexer applications.

Compared with SN74HCT153DR and 74VHC253M, CD74HCT253M96 provides guaranteed LSTTL input compatibility and long-term availability in tape-and-reel format, making it optimal for industrial control and automotive diagnostics where backward compatibility and supply chain stability are critical.

Availability

CD74HCT253M96 is available at Aetrix Electronics and suitable for industrial PLC I/O multiplexing, automotive sensor hub aggregation, aerospace avionics data switching, and automated test equipment signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HCT253M96 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 connectivity technologies, with decades of heritage in high-reliability logic and interface ICs.

The CD74HCT253M96 belongs to TI's legacy high-speed CMOS logic family, engineered specifically for robust digital signal routing in harsh-environment applications demanding wide temperature operation, noise immunity, and LSTTL interoperability.

FAQ

What is the maximum clock/data frequency supported by CD74HCT253M96?

The CD74HCT253M96 is a combinatorial multiplexer-not a clocked device-so it has no inherent clock frequency limit. Its usable data rate depends on propagation delay and system setup/hold timing. With tPLH/tPHL ≤ 57 ns (max, -55°C to +125°C), CD74HCT253M96 supports reliable signal routing up to approximately 10 MHz in typical 50 pF load conditions, assuming clean edges and proper termination.

Does CD74HCT253M96 require external pull-up or pull-down resistors on its select or enable pins?

No, CD74HCT253M96 does not require external biasing on S0, S1, 1OE, or 2OE. Its CMOS inputs draw ≤1 µA (max), and logic thresholds are internally defined (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 5 V). However, floating inputs must be avoided: tie unused enables to VCC (to disable outputs) or GND (to enable), and unused selects to fixed logic levels to prevent metastability.

Can CD74HCT253M96 operate at 3.3 V supply voltage?

No, CD74HCT253M96 is an HCT-family device specified only for 4.5 V to 5.5 V operation. At 3.3 V, VIH and VIL thresholds become undefined, input leakage may increase, and output drive capability degrades significantly. For 3.3 V systems, consider the pin-compatible CD74HC253M96 (HC family, 2 V–6 V) or SN74LVC153 (LVC family, 1.65 V–3.6 V).

What is the meaning of the "M96" suffix in CD74HCT253M96?

The "M96" suffix in CD74HCT253M96 indicates a 16-pin SOIC package (M) supplied in tape-and-reel format with 2500 units per reel (96). This packaging supports automated SMT assembly and is distinct from "M" (tube, 40 pcs), "MT" (small-reel, 250 pcs), or "E" (PDIP, tube). The device marking on the package reads "HCT253M".

How does the three-state output behavior of CD74HCT253M96 interact with bus contention?

When 1OE or 2OE is HIGH, the corresponding Y output enters high-impedance (Z) state with leakage ≤±10 µA-effectively disconnecting that section from the bus. This prevents contention when multiple CD74HCT253M96 devices share a common bus line, provided only one device has its OE LOW at any time. No external bus keeper or termination is required for basic contention avoidance.