Texas Instruments SN74LVTH273DWRE4

Overview

SN74LVTH273DWRE4 from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with direct-clear input, designed for 3.3-V V_CC operation while supporting 5-V TTL-level inputs and outputs. It features bus-hold circuitry on all data inputs, I_off partial-power-down protection, and operates down to 2.7 V. It is used in voltage-translation interfaces between 3.3-V logic domains and legacy 5-V systems.

For engineers reviewing the SN74LVTH273DWRE4 datasheet, SN74LVTH273DWRE4 pinout, SN74LVTH273DWRE4 application, or SN74LVTH273DWRE4 equivalent, key selection criteria include its 8-bit synchronous latch function, 150-MHz maximum clock frequency, bus-hold input retention, I_off support for hot-insertion, and SOIC-20 package compatibility with industrial temperature range (−40°C to 85°C).

Technical Context

The SN74LVTH273DWRE4 implements eight independent D-type flip-flops sharing a common clock (CLK) and asynchronous clear (CLR) input. Each flip-flop captures data at the positive edge of CLK, with setup time of 2.3 ns and zero hold time at V_CC = 3.3 V. The device uses TTL-compatible input thresholds (V_IL = 0.8 V, V_IH = 2.0 V) while operating from a 3.3-V supply.

Its bus-hold circuitry actively maintains valid logic states on undriven data inputs without external resistors, and I_off disables outputs during power-down to prevent backflow current. Output drive strength is ±32 mA (I_OH/I_OL) at V_CC = 3.3 V, with typical VOLP < 0.8 V for reduced ground bounce.

Key Specifications

Pinout & Package

SN74LVTH273DWRE4 is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body size, 1.27 mm lead pitch, 2.65 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1.

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 SN74AHCT273N, the SN74LVTH273DWRE4 uniquely combines 5-V input tolerance, bus-hold, I_off, and 150-MHz performance in a single 3.3-V-supply device-making it the only option for robust mixed-voltage latching in space-constrained industrial or test equipment.

Availability

SN74LVTH273DWRE4 is available at Aetrix Electronics and suitable for industrial control backplanes, memory address latching, test equipment signal conditioning, and legacy system bus buffering requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVTH273DWRE4 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, with decades of expertise in high-reliability interface and timing ICs.

The SN74LVTH273DWRE4 belongs to TI's LVTH logic family, engineered for mixed-voltage system interfacing-specifically targeting applications where 3.3-V logic must reliably communicate with 5-V TTL infrastructure.

FAQ

What is the operating temperature range for SN74LVTH273DWRE4?

The SN74LVTH273DWRE4 is rated for industrial operation from −40°C to +85°C. This range is validated per the recommended operating conditions in the official datasheet (SCBS136M), and applies to all electrical and timing specifications including 150-MHz clock operation, bus-hold functionality, and I_off behavior. The SOIC-20 DW package supports this full range without derating.

Does SN74LVTH273DWRE4 support 5-V inputs while powered from 3.3 V?

Yes, SN74LVTH273DWRE4 explicitly supports 5-V-tolerant inputs at V_CC = 3.3 V. Its input voltage range extends to 5.5 V (per absolute maximum ratings), and its VIH/VIL thresholds (2.0 V / 0.8 V) are TTL-compatible. This allows direct connection to 5-V buses without level-shifting circuitry-confirmed in the "Support Mixed-Mode Signal Operation" feature and electrical characteristics tables.

How does the bus-hold feature work on SN74LVTH273DWRE4?

The SN74LVTH273DWRE4 integrates active bus-hold circuitry on all eight D inputs, which detects and maintains the last-valid logic state when inputs float. It sources or sinks up to ±750 µA (dynamic) to hold the line-eliminating external pullup/pulldown resistors. This is documented in the functional description, electrical specs (II(hold)), and application notes such as SCBA004.

Is SN74LVTH273DWRE4 pin-compatible with other 20-pin octal flip-flops?

SN74LVTH273DWRE4 shares the standard 20-pin SOIC (DW) footprint and identical pinout with SN74LVC273, SN74AHCT273, and SN74ALS273-verified via TI's package drawings and logic family pinout consistency. However, voltage tolerances, drive strength, and features like bus-hold or I_off differ; electrical substitution requires validation per application requirements.

What is the maximum output sink current for SN74LVTH273DWRE4?

The SN74LVTH273DWRE4 delivers up to 64 mA of low-level output current (I_OL) per Q pin at V_CC = 3.3 V and T_A = 25°C, as specified in the "recommended operating conditions" table. This value is guaranteed across the full industrial temperature range (−40°C to 85°C) per the "electrical characteristics" section, enabling reliable driving of multiple TTL loads or moderate PCB capacitance.