Texas Instruments SN74AXC2T245RSWR

Overview

SN74AXC2T245RSWR from Texas Instruments is a 2-bit dual-supply bus transceiver enabling bidirectional voltage translation between independent A and B ports, each configurable from 0.65V to 3.6V. It features DIRx per channel, tri-state OE control referenced to VCCA, VCC isolation, and I_off support for partial-power-down operation. It delivers up to 380 Mbps (1.8V→3.3V) and operates across –40°C to +125°C in industrial and communications systems.

For engineers reviewing the SN74AXC2T245RSWR datasheet, SN74AXC2T245RSWR pinout, SN74AXC2T245RSWR application, or SN74AXC2T245RSWR equivalent, key selection considerations include dual-rail supply flexibility, glitch-free power sequencing, high-temperature operation, and precise direction-control referencing to VCCA - critical for low-voltage mixed-signal interconnects in space-constrained embedded designs.

Technical Context

The SN74AXC2T245RSWR implements two independent, noninverting transceiver channels with separate VCCA and VCCB rails. Each channel uses dedicated DIRx inputs (referenced to VCCA) and a shared OE input (also VCCA-referenced) to control data flow direction and output enable state. The device supports asynchronous bidirectional translation without internal latching or clocking logic.

VCC isolation ensures both I/O ports enter high-impedance when either VCCA or VCCB drops below 100 mV, while I_off protection limits current during partial power-down. Glitch-free sequencing allows arbitrary power-up/down order of VCCA and VCCB without bus contention or latch-up risk.

Key Specifications

Pinout & Package

SN74AXC2T245RSWR is housed in a 10-pin UQFN (RSW) package measuring 1.8 mm × 1.4 mm with 0.4-mm pitch, optimized for high-density PCB layouts in portable and modular electronics.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus transceiver applications.

Compared with SN74AVC2T245RSWR and TXS0202DCUR, the SN74AXC2T245RSWR uniquely combines VCC isolation, I_off, full –40°C to +125°C operation, and per-channel DIR control - making it the sole option for mission-critical industrial and automotive bus bridging where supply fault resilience and precise direction management are mandatory.

Availability

SN74AXC2T245RSWR is available at Aetrix Electronics and suitable for industrial automation, 5G infrastructure, and automotive ADAS applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SN74AXC2T245RSWR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The SN74AXC2T245RSWR belongs to TI's AXC family of advanced voltage translators, engineered specifically for ultra-low-voltage, high-reliability mixed-signal interconnect in next-generation edge computing and intelligent sensing platforms.

FAQ

What is the minimum supply voltage supported by SN74AXC2T245RSWR on VCCA and VCCB rails?

The SN74AXC2T245RSWR supports a minimum supply voltage of 0.65V on both VCCA and VCCB rails, enabling direct interfacing with sub-1V logic families such as modern AI accelerators and ultra-low-power MCUs. This specification is guaranteed across the full –40°C to +125°C operating temperature range and is validated per TI's SCES879A datasheet Section 5.4.

How does the VCC isolation feature function in SN74AXC2T245RSWR?

The VCC isolation feature in SN74AXC2T245RSWR disables all I/O outputs and forces them into high-impedance when either VCCA or VCCB falls below 100 mV. This prevents back-driving, bus contention, and unintended current paths during power-up, brown-out, or rail failure - a hardware-enforced safety mechanism independent of OE or DIR states.

Is SN74AXC2T245RSWR compatible with 0.8V CMOS logic on the A port and 3.3V LVTTL on the B port?

Yes, SN74AXC2T245RSWR is fully compatible with 0.8V CMOS logic on the A port (VCCA = 0.8V) and 3.3V LVTTL on the B port (VCCB = 3.3V). Its dual-rail architecture ensures correct input thresholds and output swing levels on each side, and its 380-Mbps capability at this voltage combination is explicitly characterized in TI's datasheet Section 5.13.

What is the maximum propagation delay for SN74AXC2T245RSWR under worst-case conditions?

The maximum propagation delay for SN74AXC2T245RSWR is 169 ns, measured at VCCA = 0.7V and VCCB = 0.7V over the full –40°C to +125°C temperature range (Section 5.6, tpd A→B). At higher voltages (e.g., VCCA = 3.3V, VCCB = 3.3V), typical delay drops to 4 ns, with worst-case still bounded at 76 ns per datasheet Section 5.13.

Does SN74AXC2T245RSWR require external pull-up or pull-down resistors on DIR or OE pins?

No, SN74AXC2T245RSWR does not require external pull-up or pull-down resistors on DIR or OE pins. These inputs are CMOS-compatible with defined VIH/VIL thresholds referenced to VCCA, and all unused inputs must be actively driven to VCCA or GND per TI's guidance in Section 5.4 Note (3) - floating connections are prohibited for reliable operation.