Texas Instruments SN74LVC863DBLE

Overview

SN74LVC863DBLE 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 mixed-voltage systems. It operates from 1.65 V to 3.6 V, accepts 5.5-V-tolerant inputs, delivers 6.1-ns max propagation delay at 3.3 V, and supports partial-power-down via Ioff. It is used in voltage-level translation between 3.3-V and 5-V logic domains in industrial control backplanes.

For engineers reviewing the SN74LVC863DBLE datasheet, SN74LVC863DBLE pinout, SN74LVC863DBLE application, or SN74LVC863DBLE equivalent, key selection considerations include its dual-directional OEAB/OEBA control architecture, 5.5-V input tolerance, Ioff-enabled power-down isolation, 24-pin SSOP (DB) package compatibility, and compliance with JESD 17 latch-up and JESD 22 ESD standards.

Technical Context

This device implements independent 3-state enable logic for A-to-B and B-to-A paths using separate OEAB1/OEAB2 and OEBA1/OEBA2 inputs, enabling flexible timing control in asynchronous bus bridging. Its Ioff circuitry actively disables outputs during power-down, preventing backflow current when VCC = 0 V.

The transceiver supports mixed-mode signal operation: inputs tolerate up to 5.5 V regardless of VCC (1.65–3.6 V), allowing direct interfacing with legacy 5-V drivers while driving 3.3-V loads. Output drive strength is specified at ±24 mA (VCC = 3 V), with VOL ≤ 0.55 V and VOH ≥ 2.2 V under full load.

Key Specifications

Pinout & Package

SN74LVC863DBLE uses a 24-pin SSOP (Shrink Small-Outline Package) with 0.65-mm lead pitch, JEDEC MO-150 compliant, body dimensions 8.20 mm × 7.40 mm × 2.00 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC863DBLE, SN74LVC863ADBR offers identical performance in production-ready packaging, while SN74LVC863APWR trades slightly higher thermal resistance for reduced vertical footprint-both require no schematic or layout changes beyond footprint adaptation.

Availability

SN74LVC863DBLE is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy peripheral bridging, hot-swappable module adapters, and multi-rail power sequencing systems requiring stable component supply and long-term obsolescence management.

Supply support for SN74LVC863DBLE 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 logic solutions, with over 50 years of innovation in industrial, automotive, and communications markets.

The SN74LVC863DBLE belongs to TI's LVC logic family, engineered for low-voltage, high-speed bidirectional bus interfacing in mixed-supply systems where voltage translation and power-down safety are critical.

FAQ

Is SN74LVC863DBLE still in active production?

No, SN74LVC863DBLE is marked as OBSOLETE by Texas Instruments per the 2014 Package Option Addendum. It was supplied in tube packaging and is no longer manufactured. For new designs, TI recommends SN74LVC863ADBR (SSOP reel) or SN74LVC863APWR (TSSOP reel) as functionally identical replacements. SN74LVC863DBLE remains available through authorized distributors for legacy repair and continuity support.

What is the maximum clock/data rate supported by SN74LVC863DBLE?

SN74LVC863DBLE does not operate synchronously and has no clock input; it is an asynchronous transceiver. Its 6.1-ns max propagation delay at 3.3 V supports data handshaking up to approximately 80 MHz in ideal conditions (assuming setup/hold margins). Real-world throughput depends on bus protocol timing, PCB trace length, and load capacitance - typical use cases include 10–25 MHz parallel bus transfers in industrial control systems.

Can SN74LVC863DBLE safely interface a 5-V microcontroller with a 3.3-V FPGA?

Yes, SN74LVC863DBLE can safely interface a 5-V microcontroller with a 3.3-V FPGA. Its inputs tolerate up to 5.5 V regardless of VCC (1.65–3.6 V), allowing direct connection to 5-V outputs. When VCC = 3.3 V, outputs swing within 3.3-V logic levels (VOH ≥ 2.2 V, VOL ≤ 0.55 V), compatible with FPGA I/O banks configured for LVTTL or LVCMOS33. No external resistors or level shifters are needed.

How should unused control inputs (OEAB1, OEAB2, etc.) be handled on SN74LVC863DBLE?

All unused control inputs on SN74LVC863DBLE - including OEAB1, OEAB2, OEBA1, and OEBA2 - must be tied to a valid logic level (VCC or GND) to prevent floating states that may cause undefined output behavior or increased ICC. TI recommends pulling unused OE inputs high (to VCC) via a 10-kΩ resistor to ensure outputs remain in high-impedance state during power-up, aligning with the device's default isolation behavior.

Does SN74LVC863DBLE support hot-swap operation in powered-backplane systems?

Yes, SN74LVC863DBLE supports hot-swap operation via its Ioff feature. When VCC = 0 V, the Ioff circuitry disables all outputs, limiting current flow to ±10 µA even if 5.5-V signals are present on A/B ports. This prevents backfeed into unpowered sections of the backplane. However, external power sequencing and TVS protection on signal lines are still required to meet full IEC 61000-4-5 surge immunity in commercial hot-swap implementations.