Texas Instruments SN74LVC863APW

Overview

SN74LVC863APW 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 features dual output-enable controls (OEAB1/OEAB2 and OEBA1/OEBA2), supports mixed-mode 5-V input/3.3-V VCC operation, and delivers 6.1 ns max propagation delay at 3.3 V - enabling use in level-shifting interfaces for FPGA-to-ASIC communication.

For engineers reviewing the SN74LVC863APW datasheet, SN74LVC863APW pinout, SN74LVC863APW application, or SN74LVC863APW equivalent, key selection considerations include its Ioff partial-power-down capability, 5.5-V-tolerant inputs, high-impedance state during power sequencing, and TSSOP-24 package compatibility with space-constrained industrial control backplanes.

Technical Context

The SN74LVC863APW implements independent directional control per bus pair via four dedicated output-enable terminals (OEAB1, OEAB2, OEBA1, OEBA2), allowing simultaneous A→B and B→A data flow or isolated bus segments. Its logic diagram confirms noninverting signal path with no internal latching beyond the functional table's "Latch A and B" mode.

It uses LVC CMOS technology with rail-to-rail input voltage tolerance (0–5.5 V) and output drive strength of ±24 mA at 3.0 V, while maintaining Ioff protection that limits current backflow to ±10 µA when powered down - critical for hot-swap and multi-rail system interoperability.

Key Specifications

Pinout & Package

TSSOP-24 package (PW), 7.8 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC863APW, the DWR offers easier manual soldering but sacrifices board density, while the DGVR achieves superior miniaturization at the cost of tighter assembly tolerances - the PW variant balances compactness, manufacturability, and thermal performance for mainstream industrial designs.

Availability

SN74LVC863APW is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA-to-MCU bridges, and automated test equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for SN74LVC863APW 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 logic interface solutions.

The SN74LVC863APW belongs to TI's LVC advanced low-voltage CMOS logic family, engineered for high-speed, low-power bidirectional bus interfacing in mixed-voltage industrial and communications systems.

FAQ

What is the maximum operating frequency supported by the SN74LVC863APW?

The SN74LVC863APW does not specify a maximum clock frequency, as it is an asynchronous transceiver. Its 6.1 ns max propagation delay at 3.3 V implies reliable operation up to approximately 164 MHz for single-cycle data transfers, assuming sufficient setup/hold time from external controllers. Actual usable rate depends on system-level timing margins, trace length, and load capacitance.

Can the SN74LVC863APW be used to translate between 5-V and 3.3-V logic domains?

Yes, the SN74LVC863APW supports mixed-mode operation: inputs tolerate 0–5.5 V regardless of VCC, and outputs swing rail-to-rail within the VCC range (1.65–3.6 V). When VCC = 3.3 V, it safely accepts 5-V inputs and drives 3.3-V-compatible outputs - making SN74LVC863APW ideal for bridging legacy 5-V peripherals to modern 3.3-V processors.

Does the SN74LVC863APW require external pull-up resistors on its output-enable pins?

Yes - to ensure outputs remain in high-impedance state during power-up or power-down, TI recommends tying OEAB1, OEAB2, OEBA1, and OEBA2 to VCC through pull-up resistors. Minimum resistance value depends on the driver's current-sinking capability; typical values range from 4.7 kΩ to 10 kΩ for standard CMOS drivers.

Is the SN74LVC863APW compatible with hot-swap or partial-power-down systems?

Yes - the SN74LVC863APW incorporates Ioff circuitry that disables outputs and limits current backflow to ±10 µA when VCC = 0 V. This feature makes SN74LVC863APW suitable for hot-pluggable modules and multi-rail systems where individual sections may be powered independently without risking damage or bus contention.

What is the thermal resistance (θJA) of the SN74LVC863APW in its TSSOP-24 package?

The SN74LVC863APW in the PW (TSSOP-24) package has a junction-to-ambient thermal resistance (θJA) of 88°C/W, as specified in TI's official packaging documentation. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with copper pour, thermal vias, or airflow in production layouts.