Texas Instruments SN74LVC16543DGGR

Overview

SN74LVC16543 from Texas Instruments is a 16-bit registered transceiver with independent A↔B bidirectional data flow control, 3-state outputs, bus-hold inputs, and 3.3-V operation. It supports dual 8-bit or single 16-bit configurations, delivers 24-mA drive strength at 3 V, and operates across –40°C to 85°C for industrial bus interfacing.

For engineers reviewing the SN74LVC16543 datasheet, SN74LVC16543 pinout, SN74LVC16543 application, or SN74LVC16543 equivalent, key selection criteria include latch-enable independence per 8-bit section, simultaneous 3-state output control, bus-hold elimination of external resistors, and compatibility with LVTTL/CMOS logic levels in memory and peripheral expansion systems.

Technical Context

This device implements two independent 8-bit registered transceivers sharing a common 56-pin TSSOP (DGG) package. Each section features dedicated CEAB/CEBA, LEAB/LEBA, and OEAB/OEBA controls enabling asynchronous latching and 3-state output gating without inter-section dependency.

It uses TI's EPIC submicron CMOS process to achieve low ground bounce (<0.8 V) and undershoot (>2 V) at 3.3 V, with latch-up immunity exceeding 250 mA per JEDEC JESD-17 - critical for hot-swap and mixed-voltage board environments.

Key Specifications

Pinout & Package

SN74LVC16543 is housed in a 56-pin Thin Shrink Small-Outline Package (DGG), 12.5 mm × 6.1 mm × 1.2 mm body, 0.5-mm lead pitch, with exposed thermal pad (non-electrical). Pin numbering follows standard top-view orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVC16543, the SN74LVC16543 offers identical functionality with higher ICC and slightly relaxed timing, making it suitable for cost-sensitive industrial applications where ultra-low power isn't required; versus 74LVCH16543A, it lacks voltage translation but guarantees pin compatibility and simpler control sequencing.

Availability

SN74LVC16543 is available at Aetrix Electronics and suitable for memory expansion interfaces, microprocessor local bus buffering, and industrial I/O backplanes requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SN74LVC16543 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 decades of experience in high-reliability interface IC design.

The SN74LVC16543 belongs to TI's Widebus™ family of advanced bus-interface devices, engineered specifically for robust, low-voltage parallel data transfer in industrial computing and communications equipment.

FAQ

What is the maximum operating frequency supported by the SN74LVC16543?

The SN74LVC16543 does not specify a maximum clock frequency, as it is a registered transceiver without an internal clock. Its usable data rate depends on external timing: with 9-ns max propagation delay and 2-ns setup/hold times, it reliably supports bus cycles up to approximately 80 MHz in well-terminated 3.3-V systems. The SN74LVC16543 performance is validated under recommended operating conditions including VCC = 2.7 V to 3.6 V and TA = –40°C to 85°C.

Does the SN74LVC16543 support hot-swap or live-insertion applications?

Yes, the SN74LVC16543 supports hot-swap applications due to its bus-hold circuitry that prevents floating inputs, robust latch-up immunity exceeding 250 mA per JEDEC JESD-17, and controlled 3-state output enable/disable timing (ten/tdis ≤ 10 ns). These features ensure stable behavior during partial power-up sequences. The SN74LVC16543 also specifies absolute maximum ratings up to VCC = 4.6 V and VI/O = VCC + 0.5 V, enhancing tolerance during transitional states.

Can the SN74LVC16543 be used for unidirectional data transfer only?

Yes, the SN74LVC16543 can operate unidirectionally: configure one section (e.g., A→B) by asserting CEAB and OEAB while holding CEBA and OEBA high to disable B→A flow. Its dual-control architecture allows full use of 16 bits in one direction without modification. The SN74LVC16543 retains bus-hold on unused ports and maintains 3-state isolation on inactive outputs, simplifying system-level design for dedicated address or data paths.

What is the purpose of the multiple VCC and GND pins on the SN74LVC16543?

The SN74LVC16543 includes six VCC and six GND pins distributed across the 56-pin DGG package to reduce simultaneous switching noise, improve power delivery integrity, and minimize ground bounce during high-speed 16-bit transitions. This layout lowers effective power-supply impedance and decouples switching currents between functional blocks. The SN74LVC16543 datasheet confirms typical VOLP < 0.8 V at 3.3 V, directly enabled by this multi-rail design.

How does bus-hold functionality work on the SN74LVC16543, and what is its impact on system design?

Bus-hold on the SN74LVC16543 uses weak feedback transistors to maintain the last-valid logic state on A/B port inputs when driven high or low, eliminating the need for external pullup/pulldown resistors. It draws ±75 µA at threshold voltages and stabilizes floating nodes within 100 ns. This reduces BOM cost, PCB space, and potential signal integrity issues - especially beneficial in modular systems where connectors may be unpopulated. The SN74LVC16543 integrates bus-hold on all 32 data I/O pins without additional configuration.