Analog Devices Inc. LTC4316IDD#PBF

Overview

LTC4316IDD#PBF from Analog Devices (formerly Linear Technology) is a single-channel I²C/SMBus address translator IC that enables coexistence of multiple slave devices with identical hardwired 7-bit addresses on the same bus by performing real-time XOR-based address translation. It operates across 2.25V–5.5V supply, supports I²C Fast Mode (400 kHz), and features ±4 kV HBM ESD protection. It is used in server backplanes and telecom chassis where hot-swappable I²C peripheral cards require unique addressing.

For engineers reviewing the LTC4316IDD#PBF datasheet, LTC4316IDD#PBF pinout, LTC4316IDD#PBF application, or LTC4316IDD#PBF equivalent, key selection criteria include resistor-configurable translation byte (0x00–0x7F), pass-through mode via XORH high, stuck-bus timeout (30 ms), level translation capability between mismatched 2.5V/3.3V/5V buses, and industrial temperature range support (–40°C to +85°C).

Technical Context

The LTC4316IDD#PBF implements a hardware-based 7-bit address translation engine using an internal shift register and XOR logic, where the translation byte is set by analog voltage thresholds at XORH (upper 3 bits) and XORL (lower 4 bits). It incorporates glitch-filtered SCL/SDA inputs, precharge circuitry for hot-swap safety, and automatic recovery from abnormal conditions including stuck-low/high bus states and premature STOP/START bits.

Its dual-switch architecture (N1 for SCL, N2 for SDA) isolates input and output buses during translation, then reconnects them post-translation. The READY open-drain output signals configuration completion, and ENABLE controls power-up initialization and dynamic reconfiguration. No firmware or host intervention is required.

Key Specifications

Pinout & Package

Package: 10-Lead (3 mm × 3 mm) Plastic DFN with exposed pad (pin 11 = GND). Industrial temperature grade (–40°C to +85°C) per LTC4316IDD#PBF ordering code.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar I²C address translation applications.

Compared with PCA9517ADP and TCA9548A, the LTC4316IDD#PBF uniquely delivers transparent, resistor-programmed address remapping without host interaction or bus arbitration overhead - essential for plug-and-play I²C peripheral systems requiring deterministic, conflict-free addressing at boot time.

Availability

LTC4316IDD#PBF is available at Aetrix Electronics and suitable for server backplane expansion, telecom chassis hot-swap modules, and industrial PLC I/O module addressing requiring stable component supply and long-term industrial temperature support.

Supply support for LTC4316IDD#PBF 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

Analog Devices, Inc. (acquired Linear Technology in 2017) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies.

The LTC4316 belongs to Linear's I²C/SMBus infrastructure portfolio, designed specifically to solve physical-layer interoperability challenges in dense, hot-swappable, multi-peripheral embedded systems - emphasizing robustness, zero-software configuration, and industrial reliability.

FAQ

What is the function of the XORH and XORL pins on the LTC4316IDD#PBF?

The XORH and XORL pins on the LTC4316IDD#PBF configure the 7-bit address translation byte: XORH sets the upper 3 bits (a6–a4) and XORL sets the lower 4 bits (a3–a0) via analog voltage thresholds. External resistive dividers between VCC and GND generate precise DC voltages to select translation values from 0x00 to 0x7F. Pulling XORH to VCC activates pass-through mode, disabling translation entirely.

Does the LTC4316IDD#PBF support I²C Fast Mode Plus (1 MHz)?

No, the LTC4316IDD#PBF does not support Fast Mode Plus. Its maximum SCL clock frequency is 400 kHz, as specified in the Electrical Characteristics table under fSCL(MAX). This aligns with standard I²C Fast Mode and SMBus 3.0, but it lacks the drive strength and timing margins required for 1 MHz operation.

Can the LTC4316IDD#PBF translate 10-bit I²C addresses?

No, the LTC4316IDD#PBF only supports 7-bit I²C addressing. The datasheet explicitly lists "10-Bit Addressing" under Unsupported I²C Protocols. Its translation engine processes exactly 7 address bits (a6–a0); the R/W bit passes through unmodified, and no provision exists for handling the extended 10-bit format.

How does the LTC4316IDD#PBF handle hot-swap insertion onto a live I²C bus?

The LTC4316IDD#PBF uses internal 1 V precharge circuitry (200 kΩ) on SCLIN and SDAIN to minimize bus disturbance during live insertion. It keeps internal switches N1 and N2 open until ENABLE goes high, XORH/XORL voltages are read, and both bus sides are idle (>120 μs high or STOP detected). Only then does it connect the buses and assert READY high.

Is the exposed pad on the LTC4316IDD#PBF package required to be connected to GND?

No, the exposed pad (pin 11) on the LTC4316IDD#PBF DFN package is electrically connected to GND but may be left unconnected or soldered to PCB ground. The datasheet states "Exposed pad may be left open or connected to device GND." Connecting it improves thermal dissipation and mechanical stability but is not mandatory for electrical functionality.