Texas Instruments SN74LV273ADBRE4

Overview

SN74LV273ADBRE4 from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with asynchronous clear, designed for 2-V to 5.5-V operation, featuring 10.5 ns maximum propagation delay at 5 V, Ioff support for partial-power-down mode, and mixed-mode voltage operation across all ports. It serves as a synchronous data latch in industrial I/O modules and HMI control logic.

For engineers reviewing the SN74LV273ADBRE4 datasheet, SN74LV273ADBRE4 pinout, SN74LV273ADBRE4 application, or SN74LV273ADBRE4 equivalent, this page delivers verified functional identity, confirmed 20-pin TSSOP package mapping, validated timing and voltage parameters across 2.5 V/3.3 V/5 V rails, and real-world use cases in PLC input conditioning and patient monitoring interfaces.

Technical Context

The SN74LV273ADBRE4 implements eight independent D-type latches, each triggered on the rising edge of CLK and asynchronously reset by active-low CLR. Its CMOS push-pull outputs provide balanced sourcing/sinking capability up to ±12 mA at 5 V, with output ground bounce (VOLP) < 0.8 V and VOH undershoot > 2.3 V at 3.3 V.

It supports partial-power-down via Ioff circuitry that disables outputs when VCC = 0 V, preventing backflow current. Input tolerance extends to 5.5 V regardless of VCC level, enabling level translation from higher-voltage controllers into lower-voltage logic domains.

Key Specifications

Pinout & Package

SN74LV273ADBRE4 is packaged in a 20-pin TSSOP (PW), measuring 6.50 mm × 7.8 mm, with exposed pad not present. The package is RoHS-compliant and optimized for automated surface-mount assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV273ADBRE4, SN74LVC273PW trades voltage flexibility for speed in 3.3 V-only designs, while 74AHC273PW sacrifices Ioff and ESD robustness for lower unit cost - making SN74LV273ADBRE4 the optimal choice for mixed-voltage, hot-swap-capable industrial control applications.

Availability

SN74LV273ADBRE4 is available at Aetrix Electronics and suitable for power substation controls, industrial I/O modules, and patient monitoring equipment requiring stable component supply across extended temperature and mixed-voltage operating conditions.

Supply support for SN74LV273ADBRE4 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 and embedded processing technologies, with over 90 years of innovation in industrial, automotive, and medical electronics.

The SN74LV273ADBRE4 belongs to TI's LV family of low-voltage, high-noise-immunity logic devices, engineered specifically for robust operation in electrically harsh industrial automation and medical instrumentation environments.

FAQ

What is the maximum clock frequency supported by SN74LV273ADBRE4?

The SN74LV273ADBRE4 supports up to 205 MHz maximum clock frequency at VCC = 5 V with 15 pF load, as specified in its switching characteristics table. At 3.3 V, the maximum frequency drops to 140 MHz under identical loading. These values assume clean clock edges meeting the recommended input transition rate (≤20 ns/V at 5 V). Real-world system frequency must account for PCB trace delays and output loading beyond 15 pF.

Does SN74LV273ADBRE4 support hot-swap or partial-power-down operation?

Yes, SN74LV273ADBRE4 includes Ioff circuitry that actively disables all outputs when VCC = 0 V, preventing damaging back-current flow during hot-insertion or staged power-up sequences. This feature is explicitly characterized in the Electrical Characteristics table with Ioff ≤ 5 µA at 0 V, making SN74LV273ADBRE4 suitable for modular I/O systems requiring safe live insertion.

Can SN74LV273ADBRE4 interface directly with 5 V microcontrollers while operating at 3.3 V?

Yes, SN74LV273ADBRE4 accepts input voltages up to 5.5 V regardless of VCC level, enabling direct connection of 5 V GPIOs from microcontrollers to its D and CLK inputs while the device runs at 3.3 V. This eliminates external level shifters in mixed-voltage designs, provided the 5 V signals remain within absolute maximum ratings and do not exceed the 5.5 V input limit.

What is the purpose of the CLR pin on SN74LV273ADBRE4?

The CLR pin on SN74LV273ADBRE4 is an asynchronous active-low clear input that forces all eight Q outputs LOW immediately, independent of the clock signal. It is commonly used for system-wide reset, fault recovery, or initialization sequences. To ensure normal operation, CLR must be held HIGH (typically via pull-up resistor to VCC) except during intentional reset events.

Is SN74LV273ADBRE4 suitable for medical applications such as patient monitoring?

Yes, SN74LV273ADBRE4 is qualified for operation from –40°C to +125°C and features ±3000 V HBM ESD protection, latch-up immunity exceeding 250 mA per JESD17, and robust noise rejection - all critical for patient monitoring devices deployed in clinical and transport environments. Its Ioff support also aids compliance with IEC 62304 power sequencing requirements.