Texas Instruments SN74LV273APW

Overview

SN74LV273APW from Texas Instruments is an octal positive-edge-triggered D-type 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 - enabling reliable data latching in industrial I/O modules and HMI control logic.

For engineers reviewing the SN74LV273APW datasheet, SN74LV273APW pinout, SN74LV273APW application, or SN74LV273APW equivalent, this page delivers verified timing parameters, TSSOP-20 package details, latch function behavior under varying V_CC, and real-world design implications of its ground-bounce (V_OLP) and undershoot (V_OHV) performance.

Technical Context

The SN74LV273APW implements eight independent D-type flip-flops sharing a common clock (CLK) and asynchronous clear (CLR) input. Each stage operates on the rising edge of CLK, with data stable before setup time (t_su = 4.5 ns min at 5 V) and held after hold time (t_h = 1 ns min at 5 V). The device uses balanced CMOS push-pull outputs capable of ±12 mA drive at 5 V.

Its I_off circuitry disables outputs when V_CC = 0 V, preventing backflow current during partial power-down. Input tolerance up to 5.5 V enables level translation from higher-voltage logic domains into the 2–5.5 V operating range - critical for mixed-supply systems in PLC and test equipment.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.50 mm × 7.8 mm body, 0.65 mm lead pitch, thermal pad not present (RGY/RKS only), rated R_θJA = 128.2°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV273APW, SN74LVC273PW offers better speed in 3.3 V systems but sacrifices 5 V input compatibility, while 74HC273PW provides wider voltage headroom without I_off or noise mitigation - making SN74LV273APW the optimal choice for mixed-voltage, noise-sensitive, and hot-swap-capable designs.

Availability

SN74LV273APW is available at Aetrix Electronics and suitable for industrial I/O modules, human machine interfaces (HMI), and patient monitoring systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LV273APW 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 medical applications.

The SN74LV273APW belongs to TI's LV family of low-voltage, high-noise-immunity logic devices - engineered specifically for robust operation in electrically harsh environments such as power substations and factory automation systems.

FAQ

What is the maximum clock frequency supported by SN74LV273APW?

The SN74LV273APW supports up to 205 MHz maximum clock frequency at V_CC = 5 V with 15 pF load capacitance, as specified in the Switching Characteristics table. At 3.3 V and 15 pF, the maximum frequency drops to 140 MHz. These values assume proper layout, decoupling, and signal integrity - exceeding them risks setup/hold violations and metastability in the SN74LV273APW.

Does SN74LV273APW support 5 V-tolerant inputs?

Yes, SN74LV273APW inputs tolerate voltages up to 5.5 V regardless of V_CC level - enabling direct interfacing with 5 V microcontrollers or legacy logic while operating from a 3.3 V supply. This feature is explicitly confirmed in Section 6.3 (Recommended Operating Conditions) and Figure 8-1 (Clamp Diode Structure) of the SN74LV273APW datasheet.

How does the I_off feature function in SN74LV273APW?

The I_off circuitry in SN74LV273APW disables all outputs when V_CC = 0 V, limiting leakage current to ≤5 µA per pin. This prevents back-driving of powered-down sections in modular systems - a key requirement for hot-swap I/O cards. The SN74LV273APW maintains this behavior across its full operating temperature range (–40°C to +125°C).

Can SN74LV273APW drive a 50 pF capacitive load reliably?

Yes, SN74LV273APW is fully characterized for 50 pF loads: timing parameters (t_pd, t_su, t_h) and output drive (I_OH/I_OL) are guaranteed across V_CC and temperature ranges under this condition. Driving >50 pF is possible but degrades timing margins and increases ground bounce - the SN74LV273APW datasheet recommends staying at or below 50 pF for full specification compliance.

What is the purpose of the CLR pin in SN74LV273APW?

The CLR (Clear) pin in SN74LV273APW is an asynchronous, active-low input that forces all eight Q outputs to LOW immediately - independent of the clock signal. Its minimum pulse width is 5 ns at 5 V, and it functions across the full –40°C to +125°C range. This makes the SN74LV273APW suitable for fail-safe reset in safety-critical applications like patient monitoring alarms.