Texas Instruments TXU0304PWR

Overview

TXU0304PWR from Texas Instruments is a 4-bit fixed-direction voltage-level translator IC with Schmitt-trigger inputs and 3-state outputs, supporting dual-rail operation from 1.1 V to 5.5 V per port, up to 200 Mbps (3.3 V → 5.0 V), and operating across –40°C to +125°C. It enables bidirectional level shifting between mismatched logic domains in UART, SPI, and GPIO interfaces.

For engineers reviewing the TXU0304PWR datasheet, TXU0304PWR pinout, TXU0304PWR application, or TXU0304PWR equivalent, key selection criteria include its VCC isolation feature, OE control flexibility (referenced to either VCCA or VCCB), integrated input pull-downs, and compatibility with TXB-family layouts for drop-in replacement in space-constrained industrial and automotive I/O subsystems.

Technical Context

The TXU0304PWR implements a noninverting, fixed-direction translation architecture where A-port signals (A1–A3, A4Y) are referenced to VCCA and B-port signals (B1Y–B3Y, B4) to VCCB. Data flow direction (A→B or B→A) is determined by OE logic state-not physical pin assignment-enabling flexible system-level routing without signal inversion.

Its Schmitt-trigger inputs provide hysteresis (ΔVT = 0.2–1.18 V depending on supply) to reject slow edges and noise, while VCC isolation (Ioff-float) forces all outputs into high-impedance when either VCCA or VCCB falls below 100 mV, preventing backfeeding and enabling partial-power-down operation in mixed-voltage systems.

Key Specifications

Pinout & Package

TSSOP-14 package (5.00 mm × 4.40 mm), thermally enhanced with exposed pad (recommended grounded). Pin 1 = A1; Pin 14 = VCCB; Pin 7 = GND; Pin 8 = OE; no internal connection on Pins 6 and 9.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage-level translation applications.

Compared with TXB0104RGER and TXU0104PWR, the TXU0304PWR uniquely combines OE-controlled 3-state outputs, VCC isolation, and one configurable bidirectional channel (B4) - making it optimal for mixed-signal industrial interfaces requiring deterministic control and fault resilience.

Availability

TXU0304PWR is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, medical wearable I/O expansion, and programmable logic controller I/O cards requiring stable component supply and long-term manufacturability.

Supply support for TXU0304PWR 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 solutions, with decades of automotive and industrial qualification expertise.

The TXU0x04 family was designed specifically for robust, low-power voltage translation in harsh environments - emphasizing VCC fault tolerance, noise immunity, and drop-in compatibility with legacy TI level shifters.

FAQ

What is the maximum supported data rate for TXU0304PWR in a 1.8 V to 3.3 V translation configuration?

The TXU0304PWR supports up to 100 Mbps when translating from 1.65 V–1.95 V (A-port) to 3.0 V–3.6 V (B-port), as specified in Section 7.6 (TMAX) of the datasheet. This applies directly to TXU0304PWR under –40°C to +125°C conditions with 50% duty cycle signals.

Does TXU0304PWR require external pull-up or pull-down resistors on its I/O pins?

No - TXU0304PWR integrates static pull-down resistors on all data inputs (A1–A3, A4Y, B4) and OE, ensuring defined logic states without external components. This eliminates floating inputs and reduces BOM count in TXU0304PWR-based designs.

Can TXU0304PWR translate signals from 5.0 V to 1.2 V, and what are the timing implications?

Yes, TXU0304PWR supports 5.0 V → 1.1 V–1.3 V down-translation at up to 10 Mbps (Section 7.6). Propagation delay increases to 42–45 ns and skew reaches 45 ns in this configuration, which must be accounted for in timing-critical TXU0304PWR implementations.

How does the VCC isolation (Ioff-float) feature behave when VCCA is disconnected and VCCB remains at 3.3 V?

When VCCA falls below 100 mV (e.g., disconnected), TXU0304PWR disables all outputs (A4Y, B1Y–B3Y) and places them in high-impedance state - regardless of VCCB voltage or OE state. This prevents backfeeding from the 3.3 V B-port into the unpowered A-port domain.

Is TXU0304PWR pin-compatible with TXB0104PW, and can it be used as a drop-in replacement?

Yes - TXU0304PWR uses the same TSSOP-14 footprint and pinout as TXB0104PW (per Section 5 and Figure 6-1). However, TXU0304PWR replaces auto-direction sensing with OE control and adds VCC isolation, so firmware must assert OE appropriately for TXU0304PWR to function identically.