Texas Instruments SN65LVCP408PAPT

Overview

SN65LVCP408PAPT from Texas Instruments is an 8×8 non-blocking gigabit crosspoint switch with VML differential I/O, supporting up to 4.25 Gbps per lane, 30 ps deterministic jitter, and integrated 100-Ω differential termination. It routes CML-compatible inputs to any output via I²C or pin-strapped control, used in high-speed telecom backplanes and XAUI redundancy systems.

For engineers reviewing the SN65LVCP408PAPT datasheet, SN65LVCP408PAPT pinout, SN65LVCP408PAPT application, or SN65LVCP408PAPT equivalent, key selection factors include per-lane pre-emphasis (0/3/6/10 dB), receive equalization (9/13 dB), 3-state output capability, and flow-through 64-pin QFP layout compatibility with high-density routing.

Technical Context

The SN65LVCP408PAPT implements a fully differential 8×8 multiplexer architecture with eight independent 8:1 output MUXes, each supporting programmable transmit pre-emphasis and receive equalization. All signal paths use VML signaling and internal 50-Ω single-ended receiver terminations (100-Ω differential).

Control is implemented via I²C interface (100 kHz standard mode) with address pins ADDR1/ADDR2 enabling up to four devices on one bus, or direct pin-strapped configuration using PRE/EQ/I2C_EN/SWT. The device includes register-mapped port selection, 3-state enable, and hardware reset (RESN active-low).

Key Specifications

Pinout & Package

SN65LVCP408PAPT uses a 64-pin TQFP (PAP) package with exposed thermal pad (PowerPAD™), requiring connection to GND plane for thermal and EMI performance. Pin numbering follows TI's standard flow-through layout optimized for layer transitions and minimal crosstalk.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed crosspoint switching applications.

Compared with MAX4815EUP+ and DS10BR150TSD, SN65LVCP408PAPT delivers higher bandwidth (4.25 Gbps), integrated signal conditioning (pre-emphasis + equalization), and on-chip termination - making it uniquely suited for XAUI, CPRI, and high-loss backplane applications where link margin and layout simplicity are critical.

Availability

SN65LVCP408PAPT is available at Aetrix Electronics and suitable for XAUI backplane redundancy, wireless base station interconnect, and high-speed network router fabric requiring stable component supply across extended temperature ranges (–40°C to 85°C).

Supply support for SN65LVCP408PAPT 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 with emphasis on reliability, precision, and signal integrity.

SN65LVCP408PAPT belongs to TI's high-speed interface portfolio, designed specifically for gigabit serial interconnect in telecom, datacom, and infrastructure equipment where deterministic jitter, channel loss compensation, and layout efficiency are paramount.

FAQ

What is the maximum supported data rate for SN65LVCP408PAPT?

The SN65LVCP408PAPT supports up to 4.25 Gbps per lane, validated per JEDEC and IEEE standards for XAUI 802.3ae compliance. This rating applies across the full operating temperature range (–40°C to 85°C) with proper termination and signal integrity practices. The SN65LVCP408PAPT maintains deterministic jitter ≤30 ps at this rate when configured with 13-dB equalization and appropriate pre-emphasis.

Does SN65LVCP408PAPT require external termination resistors?

No, SN65LVCP408PAPT integrates 100-Ω differential termination on-chip for all inputs and outputs, eliminating the need for 16 external 100-Ω resistors. This reduces PCB area, BOM count, and layout complexity while improving signal fidelity. External termination is only required if custom impedance (e.g., 80 Ω or 120 Ω) is needed - in which case internal termination must be disabled per datasheet guidelines.

How is the I²C address configured for SN65LVCP408PAPT?

The SN65LVCP408PAPT uses a 7-bit I²C slave address where the upper five bits are factory-fixed as 01011, and the lower two bits (ADDR1 and ADDR2) are user-configurable via pins 47 and 48. These pins accept logic-high (VCC), logic-low (GND), or active drive, enabling up to four unique addresses (0x58–0x5F) on a single bus - allowing multiple SN65LVCP408PAPT devices to coexist without address conflict.

Can SN65LVCP408PAPT operate with AC-coupled inputs?

Yes, SN65LVCP408PAPT supports AC-coupled inputs using its internal VBB bias network (1.6 V nominal). When AC coupling is used, the VBB pin provides self-biasing for the differential receivers, eliminating the need for external biasing circuitry. The device specifies optimal jitter performance with AC coupling, and the VBB pin must remain unconnected or decoupled per datasheet recommendations.

What is the function of the RESN pin on SN65LVCP408PAPT?

The RESN pin on SN65LVCP408PAPT is an active-low hardware reset that initializes all internal registers to default values upon power-up. It must be driven low for ≥1 µs after VCC stabilizes to ensure reliable register state initialization. Failure to assert RESN may result in undefined switch configuration or I²C communication failure. The SN65LVCP408PAPT does not auto-initialize registers without this explicit reset sequence.