Texas Instruments SN74LV273APWT

Overview

SN74LV273APWT 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. It is used in industrial I/O modules and HMI data latching applications where reliable edge-triggered storage and robust ESD tolerance (±3000 V HBM) are required.

For engineers reviewing the SN74LV273APWT datasheet, SN74LV273APWT pinout, SN74LV273APWT application, or SN74LV273APWT equivalent, this page delivers verified electrical parameters, TSSOP-20 package mapping, functional timing behavior under 2.5–5.5 V supply, latch-up immunity (>250 mA), and real-world use context in PLC input conditioning and patient monitoring interfaces.

Technical Context

The SN74LV273APWT implements eight independent D-type flip-flops sharing a common clock (CLK) and asynchronous clear (CLR) input. Each flip-flop captures D-input data on the rising edge of CLK and holds state until next clock or clear assertion. The device uses balanced CMOS push-pull outputs capable of ±12 mA drive at 5 V, with output ground bounce (V_OLP) < 0.8 V and undershoot (V_OHV) > 2.3 V at 3.3 V.

It supports partial-power-down via I_off, disabling all outputs when V_CC = 0 V to prevent backflow current. Input voltage tolerance extends to 5.5 V regardless of V_CC, enabling level translation from higher-voltage logic domains into 2.5/3.3-V systems without external buffers.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.50 mm × 7.8 mm body, 0.65 mm lead pitch, exposed thermal pad (not electrically connected), RoHS-compliant, surface-mount compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV273APWT, SN74LVC273PWR offers faster timing but sacrifices 5-V input compatibility, while 74HC273PW provides broader voltage headroom but lacks I_off and suffers higher propagation delay-making SN74LV273APWT the optimal choice for industrial mixed-voltage latching with safety-critical power sequencing.

Availability

SN74LV273APWT is available at Aetrix Electronics and suitable for industrial I/O modules, medical patient monitoring systems, and power substation controls requiring stable component supply across extended temperature and voltage ranges.

Supply support for SN74LV273APWT 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 SN74LV273APWT belongs to TI's LV logic family, engineered for low-voltage operation with high noise immunity and robustness in harsh electromagnetic environments typical of factory automation and medical instrumentation.

FAQ

What is the maximum clock frequency supported by SN74LV273APWT at 3.3 V?

At V_CC = 3.3 V ± 0.3 V and C_L = 15 pF, SN74LV273APWT supports up to 140 MHz maximum clock frequency (f_max) under typical conditions. At –40°C to +125°C, the guaranteed minimum f_max drops to 65 MHz. This makes SN74LV273APWT suitable for high-speed data acquisition interfaces in programmable logic controllers where deterministic timing is critical.

Does SN74LV273APWT support hot-swap or partial-power-down operation?

Yes, SN74LV273APWT includes I_off circuitry that disables all outputs when V_CC = 0 V, limiting leakage to 5 µA per I/O. This feature prevents damaging current backflow during hot-insertion of daughterboards or staged power-up sequences - a key requirement for SN74LV273APWT in modular industrial control chassis.

Can SN74LV273APWT interface directly with 5-V logic inputs while powered from 3.3 V?

Yes, SN74LV273APWT inputs tolerate up to 5.5 V regardless of V_CC level. When powered from 3.3 V, it safely accepts 5-V TTL or CMOS signals without clamping diode conduction or damage - a confirmed capability documented in Section 6.3 of the SN74LV273APWT datasheet and essential for SN74LV273APWT use in mixed-voltage backplanes.

What is the purpose of the thermal pad on the SN74LV273APWT TSSOP-20 package?

The thermal pad on SN74LV273APWT (PW package) is electrically isolated and intended for soldering to a PCB copper pour to improve heat dissipation. While not connected to any internal node, it reduces junction-to-board thermal resistance (R_θJB = 79.3°C/W) - critical for maintaining reliability in high-ambient-temperature deployments such as SN74LV273APWT-based flow meter controllers mounted near motors.

How does the asynchronous clear (CLR) function behave in SN74LV273APWT?

In SN74LV273APWT, CLR is an active-low asynchronous input that forces all eight Q outputs LOW immediately upon assertion, independent of CLK state or edge. Its minimum pulse width is 5 ns at 5 V (Section 6.8), enabling precise system-wide reset coordination - a defining behavior confirmed in the SN74LV273APWT function table and widely leveraged in SN74LV273APWT-based HMI and test equipment designs.