Texas Instruments SN74LVTH273IPWREP

Overview

SN74LVTH273IPWREP from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with direct clear (CLR), 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 from −40°C to 85°C in a 20-pin TSSOP package. It is used in mixed-voltage system interfacing, such as buffering address/data buses between 3.3-V logic and legacy 5-V peripherals.

For engineers reviewing the SN74LVTH273IPWREP datasheet, SN74LVTH273IPWREP pinout, SN74LVTH273IPWREP application, or SN74LVTH273IPWREP equivalent, key selection criteria include its 150-MHz maximum clock frequency, 2.3-ns setup time, bus-hold input retention, I_off current limiting, and guaranteed operation down to 2.7-V supply - critical for battery-powered and industrial control designs requiring robust level translation and latch stability.

Technical Context

This device implements eight independent D-type latches synchronized to the rising edge of CLK, each with dedicated D input and Q output. The buffered CLK and CLR inputs drive internal Schmitt-triggered receivers to improve noise immunity and timing margin. Bus-hold circuitry actively maintains valid logic states on un-driven D inputs without external resistors.

The I_off feature disables outputs when V_CC = 0 V, blocking reverse current flow up to ±100 µA per pin. Absolute maximum ratings allow 5.5-V input tolerance and 7-V transient voltage on I/O pins, enabling safe interfacing with higher-voltage systems during power sequencing or fault conditions.

Key Specifications

Pinout & Package

SN74LVTH273IPWREP is housed in a 20-pin Thin Shrink Small Outline Package (TSSOP-PW), 0.65-mm pitch, 6.5-mm × 4.4-mm body, with exposed pad not present. Pin 1 is located at top-left corner (Q1 quadrant) in tape-and-reel orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC273PWR and SN74LVCH16273DGGR, the SN74LVTH273IPWREP uniquely combines 5-V input tolerance, bus-hold, I_off, and −40°C to 85°C operation - making it the only option among the three qualified for mixed-voltage industrial control and long-lifecycle embedded systems requiring zero-resistor input termination and hot-swap safety.

Availability

SN74LVTH273IPWREP is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and test equipment requiring stable component supply, long-term lifecycle support, and compliance with enhanced product reliability standards.

Supply support for SN74LVTH273IPWREP 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 connectivity technologies, with decades of experience in high-reliability logic and interface solutions.

The SN74LVTH273IPWREP belongs to TI's enhanced-product (EP) logic family, engineered for mission-critical applications demanding extended temperature operation, controlled manufacturing baselines, and full JEDEC qualification - particularly in defense, aerospace, and industrial infrastructure.

FAQ

What is the maximum clock frequency supported by SN74LVTH273IPWREP?

The SN74LVTH273IPWREP supports a maximum clock frequency of 150 MHz at V_CC = 3.3 V ±0.3 V, as specified in the timing characteristics table. This value is validated across the full −40°C to 85°C operating range and reflects guaranteed performance under worst-case load (C_L = 50 pF). At lower V_CC (e.g., 2.7 V), the maximum frequency remains 150 MHz but with increased propagation delays - t_PLH/t_PHL up to 7 ns. The SN74LVTH273IPWREP achieves this speed through optimized internal gate design and Schmitt-triggered clock input buffering.

Does SN74LVTH273IPWREP require external pull-up or pull-down resistors on its data inputs?

No, SN74LVTH273IPWREP does not require external pull-up or pull-down resistors on its data inputs because it integrates active bus-hold circuitry on all eight D inputs. This feature maintains the last valid logic state when inputs are floating or undriven, with a typical hold current of ±750 µA. Using external resistors with the bus-hold function is explicitly discouraged in the datasheet, as it can cause contention and increase power consumption. The SN74LVTH273IPWREP's bus-hold eliminates BOM items and improves noise immunity in sparsely populated bus configurations.

Can SN74LVTH273IPWREP interface directly with 5-V TTL logic?

Yes, SN74LVTH273IPWREP supports direct interface with 5-V TTL logic: its inputs tolerate up to 5.5 V (absolute max 7 V), and its outputs drive to >2.4 V high and <0.55 V low under 32-mA load - fully compatible with TTL input thresholds. This mixed-mode capability allows the SN74LVTH273IPWREP to serve as a voltage-level bridge between 3.3-V microcontrollers and legacy 5-V peripherals without external translators. The device achieves this while operating from a 3.3-V supply, making it ideal for upgrading older systems while retaining existing 5-V infrastructure.

What is the purpose of the I_off feature in SN74LVTH273IPWREP?

The I_off feature in SN74LVTH273IPWREP disables all outputs when V_CC = 0 V, limiting reverse current flow to ±100 µA per I/O pin. This prevents damaging back-current from externally powered buses into a powered-down device - a critical requirement for hot-swap, modular backplanes, and partial power-down systems. During I_off operation, the SN74LVTH273IPWREP's outputs enter a high-impedance state regardless of input or clock activity, ensuring safe isolation. This behavior is tested and guaranteed across the full temperature range and is integral to the device's enhanced product qualification for industrial and defense applications.

Is SN74LVTH273IPWREP suitable for automotive applications?

SN74LVTH273IPWREP is rated for −40°C to +85°C operation and qualified to JEDEC reliability standards (including HAST, temperature cycling, and latch-up >500 mA), making it suitable for under-hood and cabin automotive applications where ambient temperatures remain within that range. However, it is not AEC-Q200 qualified or specified for the −40°C to +125°C under-hood range required by many powertrain modules. For body control units, lighting controllers, or infotainment interfaces operating at ≤85°C, the SN74LVTH273IPWREP provides proven reliability, bus-hold robustness, and mixed-voltage compatibility - but designers targeting full AEC-Q200 compliance should verify additional stress testing or consider automotive-grade alternatives.