Texas Instruments SN74LV273ANS

Overview

SN74LV273ANS from Texas Instruments is an octal D-type positive-edge-triggered flip-flop with asynchronous clear, designed for 2-V to 5.5-V V_CC operation. It features 10.5 ns maximum propagation delay at 5 V, I_off support for partial-power-down mode, and mixed-mode voltage operation across all ports. It is used in industrial I/O modules and HMI systems requiring synchronized data latching with robust noise immunity.

For engineers reviewing the SN74LV273ANS datasheet, SN74LV273ANS pinout, SN74LV273ANS application, or SN74LV273ANS equivalent, this page delivers verified electrical specs, package mapping to SOIC-20 (NS), functional timing behavior, and real-world implementation guidance for stable latch-based digital interfacing.

Technical Context

The SN74LV273ANS implements eight independent D-type flip-flops sharing a common clock (CLK) and asynchronous clear (CLR) input. Each stage latches data on the rising edge of CLK, with output states held until the next active clock edge or CLR assertion. The device uses balanced CMOS push-pull outputs capable of sourcing/sinking ±12 mA at 5 V.

It supports partial-power-down via I_off, disabling outputs when V_CC = 0 V to prevent backflow current. Input tolerance up to 5.5 V enables level translation from higher-voltage logic domains into lower V_CC systems without external circuitry.

Key Specifications

Pinout & Package

SN74LV273ANS is supplied in NS (SOIC-20) package: 12.60 mm × 5.30 mm body, 0.65 mm lead pitch, surface-mount, gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop applications.

Compared with SN74LVC273PW and 74HC273D, the SN74LV273ANS uniquely combines 5.5 V input tolerance, I_off, and full industrial temperature range - making it the only option for robust, mixed-voltage, hot-pluggable I/O latching in modern industrial controllers.

Availability

SN74LV273ANS is available at Aetrix Electronics and suitable for power substation controls, industrial I/O modules, and human machine interfaces requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for SN74LV273ANS 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 for industrial, automotive, and communications markets.

The SN74LV273ANS belongs to TI's LV logic family, engineered for low-voltage operation with high noise immunity and mixed-voltage interoperability in harsh industrial control systems.

FAQ

What is the maximum clock frequency supported by the SN74LV273ANS?

The SN74LV273ANS supports up to 120 MHz maximum clock frequency at V_CC = 5 V with 15 pF load, and 100 MHz across its full –40°C to +125°C operating range. At 3.3 V, f_max is 75 MHz (25°C) and 65 MHz (–40°C to +125°C). These values assume proper layout, decoupling, and load capacitance ≤50 pF - exceeding this may degrade timing margins.

Does the SN74LV273ANS support partial power-down mode?

Yes, the SN74LV273ANS supports partial power-down mode via its I_off feature. When V_CC = 0 V, all outputs are disabled and leakage is limited to 5 µA per pin, preventing damaging backflow current. This is essential for hot-swap I/O modules and multi-rail systems where subsystems power up/down independently.

Can the SN74LV273ANS accept 5 V inputs while operating at 3.3 V V_CC?

Yes, the SN74LV273ANS accepts input voltages up to 5.5 V regardless of V_CC level - enabling direct interface with 5 V microcontrollers, sensors, or legacy logic without level shifters. This 5.5 V tolerance is explicitly specified in the Absolute Maximum Ratings and confirmed across all operating temperatures.

What is the function of the CLR pin on the SN74LV273ANS?

The CLR pin on the SN74LV273ANS is an asynchronous active-low clear input that forces all eight Q outputs LOW immediately, independent of the clock signal. It overrides all D-input states and operates even when CLK is static. This provides deterministic reset capability for safety-critical or initialization sequences in industrial control systems.

Which package variant does SN74LV273ANS correspond to?

SN74LV273ANS corresponds to the NS (SOIC-20) package: 12.60 mm × 5.30 mm body size, 0.65 mm lead pitch, gull-wing surface-mount leads. This variant is distinct from DB (SSOP), PW (TSSOP), or RGY (VQFN) versions - pinout and thermal characteristics are identical, but mechanical dimensions and soldering requirements differ.