Texas Instruments SN74LVC863ANSR

Overview

SN74LVC863ANSR from Texas Instruments is a 9-bit bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in 1.65-V to 3.6-V systems. It supports mixed-mode operation (5-V inputs with 3.3-V VCC), features Ioff partial-power-down protection, and delivers 6.1 ns max propagation delay at 3.3 V - used in FPGA-to-ASIC interconnects, memory expansion interfaces, and industrial backplane buffers.

For engineers reviewing the SN74LVC863ANSR datasheet, SN74LVC863ANSR pinout, SN74LVC863ANSR application, or SN74LVC863ANSR equivalent, key selection criteria include 3-state control logic (dual OEAB/OEBA pairs), 5.5-V-tolerant inputs, latch-up immunity (>250 mA), ESD robustness (2000-V HBM), and SSOP-24 package compatibility with space-constrained PCB layouts.

Technical Context

The SN74LVC863ANSR implements dual-directional 9-bit data routing via independent OEAB and OEBA control groups, enabling simultaneous A→B and B→A transfers or isolated high-impedance states per channel pair. Its LVC logic family ensures TTL-compatible thresholds and rail-to-rail output swing across the full 1.65–3.6-V supply range.

Input tolerance to 5.5 V and Ioff circuitry allow safe operation during partial power-down in mixed-voltage systems. The device uses standard CMOS output stages with ±24-mA drive capability at 3.0 V, supporting termination-resistor-based signal integrity in high-speed parallel buses.

Key Specifications

Pinout & Package

SN74LVC863ANSR is housed in a 24-pin SSOP (Shrink Small Outline Package) with 0.635-mm lead pitch, 7.7-mm body width, and 1.2-mm maximum height - optimized for automated SMT assembly and thermal dissipation in dense layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 9-bit bus transceiver applications.

Compared with SN74LVC863APWR and SN74LVC863ADW, the SN74LVC863ANSR offers optimal thermal performance (θJA = 65°C/W) and compact SSOP-24 footprint for high-density industrial PCBs - making it preferred for thermally constrained, space-limited applications requiring sustained 9-bit bidirectional throughput.

Availability

SN74LVC863ANSR is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA-to-ASIC bridges, and memory expansion subsystems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for SN74LVC863ANSR 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 SN74LVC863ANSR belongs to TI's LVC logic family - engineered for low-voltage, high-speed bidirectional bus interfacing in mixed-signal systems where voltage translation, power sequencing, and ESD resilience are critical.

FAQ

What is the recommended power-up sequence for SN74LVC863ANSR to avoid bus contention?

TI specifies that OEAB and OEBA inputs must be held high (inactive) during power-up to maintain outputs in high-impedance state. Tie OEAB1/OEAB2/OEBA1/OEBA2 to VCC via ≥10-kΩ pullup resistors - this ensures SN74LVC863ANSR enters safe isolation before downstream logic initializes. Do not rely on internal weak pullups, as they are not specified.

Can SN74LVC863ANSR safely interface a 5-V microcontroller with a 3.3-V FPGA without external level shifters?

Yes. SN74LVC863ANSR accepts 5-V inputs while operating from 3.3-V VCC, and its outputs swing rail-to-rail (0 V to 3.3 V). This makes SN74LVC863ANSR ideal for direct connection between 5-V MCU address/data buses and 3.3-V FPGA I/O banks - no external translators needed, provided VCC remains within 1.65–3.6 V.

What is the maximum sustained output current per pin for SN74LVC863ANSR at 3.0 V VCC?

Per TI's SCAS310J datasheet, SN74LVC863ANSR supports ±24 mA DC output current per pin at VCC = 3.0 V (IOL = 24 mA, IOH = –24 mA). Exceeding this risks exceeding absolute max ratings (±50 mA) and may trigger thermal shutdown or permanent damage - always verify total package current (≤100 mA) in multi-pin drive scenarios.

Does SN74LVC863ANSR support hot-swap operation in powered-backplane systems?

Yes. SN74LVC863ANSR incorporates Ioff circuitry that disables outputs and limits leakage to ±10 µA when VCC = 0 V - enabling safe insertion into live 3.3-V or 5-V backplanes. This feature is validated per JESD 78 and allows SN74LVC863ANSR to be used in modular industrial chassis without system shutdown.

How does the SN74LVC863ANSR handle simultaneous A→B and B→A data transfers?

SN74LVC863ANSR uses independent OEAB and OEBA control groups: OEABx enables A→B transfer, OEBAx enables B→A transfer. When both OEAB1/OEBA1 are active, A1↔B1 operates bidirectionally; however, true simultaneous bidirectional flow on the same pin pair is not supported - direction is controlled per group, not per bit. Full 9-bit concurrency requires staggered OE activation.