Texas Instruments SN74AVC24T245GRGR

Overview

SN74AVC24T245 from Texas Instruments is a 24-bit dual-supply bus transceiver enabling bidirectional voltage translation between 1.2-V to 3.6-V domains, with independent A-port (VCCA-referenced) and B-port (VCCB-referenced) operation, 380 Mbps max data rate (1.8-V → 3.3-V), I_off partial-power-down support, and V_CC isolation for system-level fault containment in mixed-voltage interconnects.

For engineers reviewing the SN74AVC24T245 datasheet, SN74AVC24T245 pinout, SN74AVC24T245 application, or SN74AVC24T245 equivalent, key selection criteria include configurable dual-rail supply range (1.2–3.6 V per port), direction-control and output-enable logic referenced solely to VCCA, 4.6-V I/O tolerance, latch-up immunity (>100 mA), and LFBGA-83 package thermal performance (R_θJA = 38.1°C/W).

Technical Context

The SN74AVC24T245 implements asynchronous bidirectional data flow controlled by six DIR inputs (1DIR–6DIR) and six OE inputs (1OE–6OE), all referenced to VCCA. Each DIR governs one 4-bit channel's transmission direction (A→B or B→A), while corresponding OE enables/disables that channel's outputs into high-impedance state.

V_CC isolation ensures both ports enter high-Z if either VCCA or VCCB drops to GND; I_off circuitry prevents backflow current during partial power-down; and overvoltage-tolerant I/Os (up to 4.6 V) allow safe interfacing across mismatched supply rails without external protection.

Key Specifications

Pinout & Package

LFBGA-83 package (10.00 mm × 4.50 mm, 0.5-mm pitch) with exposed thermal pad; 83-pin grid arranged in 6×14 array plus corner pins, optimized for signal integrity and thermal dissipation in high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH16T245DGGR and TXB0304RUTR, the SN74AVC24T245 provides higher channel count, guaranteed V_CC isolation, and superior speed for wide parallel buses - making it uniquely suited for DDR, memory buffer, and multi-lane FPGA interconnects requiring deterministic direction control and fault containment.

Availability

SN74AVC24T245 is available at Aetrix Electronics and suitable for DDR memory subsystems, FPGA-to-ASIC interconnects, industrial Ethernet PHY interfaces, and multi-rail SoC debug applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SN74AVC24T245 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 interface IC design and high-reliability manufacturing.

The SN74AVC24T245 belongs to TI's AVC (Advanced Very-low-voltage CMOS) logic family, engineered specifically for ultra-low-voltage bidirectional translation in next-generation memory, processor, and FPGA interconnects demanding sub-3-ns timing, robust ESD immunity, and seamless power-domain bridging.

FAQ

What is the minimum operating voltage for both VCCA and VCCB on the SN74AVC24T245?

The SN74AVC24T245 supports a minimum supply voltage of 1.2 V on both VCCA and VCCB rails, enabling compatibility with modern ultra-low-voltage processors and memory devices. Operation below 1.2 V is not characterized or guaranteed, and VIH/VIL thresholds scale proportionally with VCCA per datasheet tables - for example, at VCCA = 1.2 V, VIH(min) = 0.42 V and VIL(max) = 0.36 V.

Does the SN74AVC24T245 require external pull-up resistors on OE or DIR pins?

No external pull-up resistors are required on DIR pins, but TI recommends tying OE pins to VCCA through a pull-up resistor (minimum value determined by driver sink capability) to ensure high-impedance state during power-up/power-down transients. The SN74AVC24T245 internal circuitry does not assert default states on these inputs, so uncontrolled OE could cause bus contention before firmware initialization.

Can the SN74AVC24T245 translate between 1.2-V and 3.3-V logic levels bidirectionally in real time?

Yes, the SN74AVC24T245 supports true bidirectional voltage translation between 1.2-V and 3.3-V domains in real time: when VCCA = 1.2 V and VCCB = 3.3 V, data flows from A→B or B→A depending on DIR state, with VOH/VOL specified across the full range. At this combination, max data rate is 100 Mbps, and output drive strength is reduced versus matched-rail operation - verified in Table 6.5 and Figure 6-10.

How does the VCC isolation feature behave if VCCA is powered but VCCB is disconnected?

If VCCB is disconnected (i.e., floating or at GND) while VCCA remains powered, the SN74AVC24T245 activates VCC isolation: all B-port outputs enter high-impedance state, and A-port outputs also go high-Z regardless of DIR/OE states. This behavior is hardware-enforced and requires no external circuitry - it protects downstream 3.3-V circuitry from undefined states or backfeed current when the B-side rail is absent.

Is the SN74AVC24T245 pin-compatible with earlier SN74ALVC24T245 or SN74LVC24T245 variants?

No, the SN74AVC24T245 is not pin-compatible with SN74ALVC24T245 or SN74LVC24T245. While all three share the LFBGA-83 package outline, pin assignments differ significantly - particularly for VCCA/VCCB distribution and GND placement - as confirmed in TI's SCES552E revision history and mechanical drawings. Migration requires PCB layout revision and signal routing validation.