Texas Instruments SN74AVC4T234ZSUR

Overview

SN74AVC4T234ZSUR from Texas Instruments is a 4-bit dual-supply unidirectional noninverting voltage translator IC enabling asynchronous level translation between B-port (VCCB-referenced) and A-port (VCCA-referenced) interfaces. It operates across independent 0.9 V–3.6 V supply rails, delivers ≤3.7 ns propagation delay at 3.3 V, supports up to 380 Mbps (1.8 V → 3.3 V), and features Ioff for partial-power-down mode - used in battery-powered portable SoC-to-peripheral interfacing.

For engineers reviewing the SN74AVC4T234ZSUR datasheet, SN74AVC4T234ZSUR pinout, SN74AVC4T234ZSUR application, or SN74AVC4T234ZSUR equivalent, key selection criteria include dual-rail configurability, 3.6-V I/O tolerance on A-side, balanced tPLH/tPHL timing, ±3-mA drive at 1.8 V, and 26-Ω series resistors on A-side outputs for signal integrity in mixed-voltage systems.

Technical Context

The SN74AVC4T234ZSUR implements a fully configurable dual-rail architecture where B-port inputs track VCCB (0.9–3.6 V) and A-port outputs track VCCA (0.9–3.6 V), enabling bidirectional voltage node bridging without direction control pins. Its logic diagram confirms strict unidirectional B→A signal flow with no internal feedback or bus-hold circuitry.

VCC isolation ensures A-side outputs enter high-impedance when either VCCA or VCCB = 0 V, while input hysteresis improves noise immunity for slow-rising signals. The device uses CMOS input stages with rail-to-rail swing capability and integrates 26-Ω series termination on all A-side outputs to dampen reflections in high-speed traces.

Key Specifications

Pinout & Package

NFBGA-11 (ZWA) package, 2.00 mm × 1.40 mm body size, 0.45 mm max height, 0.5 mm ball pitch, RoHS-compliant Sn98.5/Ag1/Cu0.5 finish, MSL Level-2-260°C-1 year.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXB0104RUTR and SN74LVC4T3147PWR, SN74AVC4T234ZSUR uniquely combines sub-4 ns timing, integrated A-side termination, Ioff-enabled power sequencing, and 0.9-V minimum supply - making it optimal for compact, battery-sensitive, high-speed unidirectional interfaces where deterministic delay and power-state safety are critical.

Availability

SN74AVC4T234ZSUR is available at Aetrix Electronics and suitable for mobile SoC interface, industrial sensor hub, enterprise SSD controller, and telecom baseband interface applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SN74AVC4T234ZSUR 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 expertise in precision logic and interface solutions.

The SN74AVC4T234ZSUR belongs to TI's AVC (Advanced Very-Low-Voltage CMOS) logic family, designed specifically for ultra-low-voltage, high-speed bidirectional/mixed-voltage interfacing in portable, industrial, and communications equipment.

FAQ

What is the maximum supported data rate for SN74AVC4T234ZSUR when translating from 1.8 V to 3.3 V?

The SN74AVC4T234ZSUR supports up to 380 Mbps when translating signals from 1.8 V (VCCB) to 3.3 V (VCCA), as specified in the official Texas Instruments datasheet SCES810B. This performance is achievable under recommended operating conditions with proper PCB layout, including controlled-impedance routing and local decoupling. The SN74AVC4T234ZSUR achieves this using balanced propagation delays and integrated 26-Ω series resistors on A-side outputs to maintain signal integrity.

Does SN74AVC4T234ZSUR support bidirectional translation?

No, SN74AVC4T234ZSUR is strictly unidirectional - it translates signals only from B-port inputs to A-port outputs. The device has no direction-control pin or auto-sensing logic. For bidirectional applications such as I²C, consider alternatives like TXB0104RUTR. The SN74AVC4T234ZSUR's fixed B→A flow simplifies timing analysis and eliminates direction-switching glitches, making it ideal for clock, address, or parallel data buses where direction is static.

What happens to the A-side outputs when VCCA = 0 V but VCCB remains powered?

When VCCA = 0 V, the SN74AVC4T234ZSUR activates its VCC isolation feature: all A-side outputs (A1–A4) automatically enter a high-impedance state regardless of B-port input states or VCCB voltage. This prevents damaging current backflow into the unpowered A-side domain. The same behavior occurs if VCCB = 0 V. This function is integral to the SN74AVC4T234ZSUR's design and is verified per JESD78 Class II latch-up testing.

Can SN74AVC4T234ZSUR operate with VCCA = 1.2 V and VCCB = 3.3 V?

No - SN74AVC4T234ZSUR only supports translation from lower to higher or equal voltages on the B→A path (i.e., VCCB ≤ VCCA). With VCCA = 1.2 V and VCCB = 3.3 V, the B-port inputs would exceed the 3.6-V absolute maximum rating relative to VCCA, risking damage. The SN74AVC4T234ZSUR is designed for VCCB ≤ VCCA configurations, such as 1.2 V → 1.8 V, 1.8 V → 3.3 V, or 2.5 V → 3.3 V. Always ensure VCCB does not exceed VCCA by more than 0.5 V in active operation.

Is there internal series resistance on the B-side outputs of SN74AVC4T234ZSUR?

No, the 26-Ω series resistor is present only on the A-side outputs (A1–A4) of the SN74AVC4T234ZSUR, as confirmed in the "Features" section of the datasheet. B-side inputs (B1–B4) have standard CMOS input structure with no series termination. This design allows clean signal injection from the driving device while providing controlled edge rates on the translated A-side outputs - critical for reducing EMI and overshoot in high-speed interconnects. The SN74AVC4T234ZSUR datasheet explicitly lists "26-Ω series resistor on A-side outputs" as a distinguishing feature.