Texas Instruments SN74F253DR

Overview

SN74F253DR from Texas Instruments is a dual 4-line to 1-line data selector/multiplexer with independent 3-state outputs, designed for bus-organized digital systems. It features two independent 4:1 multiplexer sections (1Y and 2Y), common select inputs (A/B), separate strobe controls (1G/2G), operates at 4.5–5.5 V, and is rated for 0°C to 70°C ambient temperature.

For engineers reviewing the SN74F253DR datasheet, SN74F253DR pinout, SN74F253DR application, or SN74F253DR equivalent, this page delivers verified functional architecture, validated timing parameters (tPLH/tPHL ≤13 ns), true 3-state output behavior, and confirmed SOIC-16 package compatibility for legacy TTL bus interface designs.

Technical Context

The SN74F253DR implements two independent 4:1 multiplexer sections sharing binary select lines A and B, each with dedicated active-low strobe (1G, 2G) enabling full 3-state control per output. Its internal logic uses TTL-compatible AND-OR-invert gates with built-in inverters and drivers for full binary decoding.

Each section selects one of four data inputs (C0–C3) based on A/B states and drives its output (1Y or 2Y) only when its strobe is low; otherwise, the output enters high-impedance state. This enables time-multiplexed bus sharing without external tri-state buffers.

Key Specifications

Pinout & Package

SN74F253DR is supplied in a 16-pin SOIC (D) package with 1.27 mm pitch, 10.3 mm body width, and tape-and-reel packaging (2500 units/reel). Pin 1 orientation follows Q1 quadrant per JEDEC standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LS253N and SN74HC153DR, the SN74F253DR delivers superior speed and drive strength for legacy 5-V TTL bus environments but requires strict 5-V supply regulation and generates higher dynamic power.

Availability

SN74F253DR is available at Aetrix Electronics and suitable for industrial control panels, legacy microprocessor peripherals, and test equipment requiring stable component supply with long-term obsolescence mitigation.

Supply support for SN74F253DR 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74F253DR belongs to TI's 74F Fast TTL logic family, engineered for high-speed digital signal routing in commercial-grade systems where propagation delay and drive strength outweigh power efficiency concerns.

FAQ

What is the maximum clock frequency supported by SN74F253DR in multiplexer mode?

The SN74F253DR does not operate on a clock signal - it is a combinational logic device. Its usable switching rate depends on propagation delay (≤13 ns) and system setup/hold timing. In practice, SN74F253DR reliably supports data selection rates up to ~30 MHz in well-terminated 5-V TTL buses with proper decoupling. Always verify timing margins using worst-case tPLH/tPHL values from the datasheet for your specific load and layout.

Can SN74F253DR be used with 3.3-V logic systems?

No - SN74F253DR is a 5-V-only TTL device with VIH minimum of 2.0 V and VIL maximum of 0.8 V. Driving its inputs from 3.3-V CMOS may result in marginal or invalid logic levels. Likewise, its outputs swing near 0 V / 3.4 V (not 3.3 V rail), risking overvoltage damage to 3.3-V receivers. Use level translators or select a 3.3-V-compatible alternative like SN74LVC153 if interfacing with modern low-voltage logic.

Does SN74F253DR support hot insertion or live bus connection?

No - SN74F253DR lacks hot-swap protection features such as power-up 3-state or bus-fault tolerance. Connecting it to a live 5-V bus risks latch-up or excessive current due to input voltage exceeding VCC + 0.5 V. Always power-cycle the board before inserting SN74F253DR, and ensure all supply and ground connections are made before applying signal inputs.

What is the meaning of "F253" marking on the SN74F253DR package?

The "F253" marking on the SN74F253DR SOIC body is the standardized TI part abbreviation per the package option addendum. It identifies the device as a 74F-series dual 4:1 multiplexer and distinguishes it from other variants (e.g., "153" for non-3-state versions). Full traceability requires cross-checking with the full orderable number SN74F253DR and reel label data.

How does the strobe (G) input behavior differ between SN74F253DR and SN74F153?

SN74F253DR has two independent active-low strobes (1G and 2G), one per multiplexer section, allowing asynchronous enable/disable of each output. In contrast, SN74F153 uses a single shared strobe (G) that simultaneously disables both outputs. This makes SN74F253DR uniquely suited for applications requiring independent bus arbitration - for example, enabling one section to drive while holding the other in high-Z during memory read/write cycles.