Texas Instruments SN74ALVCH16863DGGR

Overview

SN74ALVCH16863DGGR from Texas Instruments is an 18-bit noninverting bus transceiver with 3-state outputs, designed for synchronous bidirectional data transfer between 1.65-V to 3.6-V buses. It supports dual 9-bit or single 18-bit operation, features bus-hold circuitry eliminating external pull resistors, and operates across –40°C to 85°C for industrial bus interfacing.

For engineers reviewing the SN74ALVCH16863DGGR datasheet, SN74ALVCH16863DGGR pinout, SN74ALVCH16863DGGR application, or SN74ALVCH16863DGGR equivalent, key selection criteria include VCC range (1.65–3.6 V), 3-state enable timing (ten/tdis ≤ 5.8 ns at 2.5 V), bus-hold input retention, and TSSOP-56 package compatibility with high-density PCB layouts.

Technical Context

The SN74ALVCH16863DGGR implements two independent 9-bit transceiver sections, each controlled by separate OEAB/OEBA inputs to route data either A→B or B→A. Its EPIC™ submicron CMOS process enables low-voltage operation while maintaining TTL-compatible thresholds across the full VCC range.

Bus-hold circuitry actively maintains valid logic states on floating data inputs without external components, and output-enable logic ensures high-impedance isolation during power-up/down when OE is pulled to VCC. The device meets JESD 17 latch-up immunity (>250 mA) and MIL-STD-883 ESD ratings (>2000 V HBM).

Key Specifications

Pinout & Package

TSSOP-56 (DGG) package: 13.9 mm × 6.1 mm × 1.2 mm body, 0.5-mm lead pitch, exposed pad not present, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16T245DGGR and SN74AVC16T245DGGR, the SN74ALVCH16863DGGR uniquely combines 1.65-V operation, integrated bus-hold, and industrial temperature range - making it optimal for mixed-voltage industrial backplanes where reliability and BOM simplification are critical.

Availability

SN74ALVCH16863DGGR is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA-to-ASIC bridging, memory subsystem expansion, and legacy peripheral adaptation requiring stable component supply and long-term lifecycle assurance.

Supply support for SN74ALVCH16863DGGR 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 SN74ALVCH16863DGGR belongs to TI's Widebus™ family of high-speed, low-voltage bus interface devices, engineered specifically for robust, low-power bidirectional data transfer in space-constrained industrial and computing systems.

FAQ

What is the minimum VCC voltage required for reliable operation of the SN74ALVCH16863DGGR?

The SN74ALVCH16863DGGR is specified to operate down to 1.65 V, with guaranteed performance across VIH/VIL thresholds, output drive, and timing parameters at this rail. Operation below 1.65 V is not characterized and may result in undefined logic states or increased propagation delay. Always verify timing margins using the recommended operating conditions table in the SCES060B datasheet for your specific VCC and temperature conditions. The SN74ALVCH16863DGGR must not be operated outside its absolute maximum rating of –0.5 V to 4.6 V on VCC.

Does the SN74ALVCH16863DGGR require external pull-up or pull-down resistors on its data inputs?

No, the SN74ALVCH16863DGGR integrates active bus-hold circuitry on all data inputs (A and B sides), which maintains valid logic levels on unused or floating pins without external components. This feature eliminates the need for pull-up or pull-down resistors, reducing bill-of-materials cost and PCB area. Bus-hold current is specified as ±75 µA at VCC = 3 V, ensuring sufficient drive to override typical noise coupling. The SN74ALVCH16863DGGR's bus-hold behavior is fully characterized across its operating temperature and voltage range.

How does the SN74ALVCH16863DGGR handle power-up and power-down sequencing?

To ensure high-impedance outputs during power-up or power-down, the OEAB and OEBA inputs must be tied to VCC through a pull-up resistor; the minimum resistance is determined by the driver's current-sinking capability. The SN74ALVCH16863DGGR does not include internal power-on reset circuitry, so external control of OE is required for deterministic bus isolation. During undervoltage conditions, the device enters an undefined state - proper sequencing requires OE to remain asserted (low) only after VCC stabilizes above 1.65 V. This behavior is explicitly documented in the SN74ALVCH16863DGGR datasheet Section 6.2.

Can the SN74ALVCH16863DGGR be used as two independent 9-bit transceivers?

Yes, the SN74ALVCH16863DGGR is internally partitioned into two independent 9-bit sections (1A/1B and 2A/2B), each with dedicated OEAB and OEBA control inputs. This allows simultaneous bidirectional communication on two separate buses - for example, routing data from Processor Bus A to Memory Bank 1 while concurrently transferring from Processor Bus B to I/O Peripherals. Pin mapping and function table in the SN74ALVCH16863DGGR datasheet confirm separate enable logic and isolated signal paths for each 9-bit group.

What is the thermal resistance (θJA) of the SN74ALVCH16863DGGR in its DGG package?

According to the SN74ALVCH16863DGGR datasheet (SCES060B, Section 6.1), the junction-to-ambient thermal resistance (θJA) for the DGG package is 81°C/W under standard JEDEC test conditions (JESD 51). This value assumes a 1-inch² copper pad with 2-oz copper weight and no additional heatsinking. For thermal design, users must calculate maximum allowable power dissipation using TJ(max) = 150°C and ambient temperature, referencing the ICC and IOL/IOH specifications to estimate worst-case dynamic power. The SN74ALVCH16863DGGR's θJA directly impacts safe continuous operation in enclosed industrial enclosures.