LTC4313IDD-1#PBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4313IDD-1#PBF is a hot swappable bidirectional 2-wire bus buffer designed for I2C and SMBus applications. It operates with a supply voltage (VCC) range of 2.9V to 5.5V and supports an input/output bus voltage range of 2.9V to 5.5V. The device features a high noise margin with a VIL threshold of 0.3•VCC, ensuring compatibility with non-compliant devices driving high VOL levels. It includes rise time accelerators configured as slew-limited switches capable of sourcing up to 40mA pull-up current to meet rise time specifications in heavily loaded systems. The component supports level translation between 3.3V and 5V busses and provides stuck bus disconnect and recovery functionality.

Signal Buffers, Repeaters, Splitters Feature Summary

• Provides bidirectional buffering with high noise margin for interoperability with non-compliant I2C devices
• Includes strong rise time accelerators configured as slew-limited switches to reduce bus rise times
• Features precharge circuitry to minimize bus disturbances during live board insertion and removal
• Detects stuck low conditions and automatically generates clock pulses to recover the bus

Signal Buffers, Repeaters, Splitters Applications

• Bidirectional buffering to increase fanout on I2C buses
• Live board insertion and removal from backplanes
• Telecommunications systems including ATCA architectures
• Level translation between 3.3V and 5V busses

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific suffix IDD-1 against the official Analog Devices datasheet to confirm the industrial temperature grade (-40°C to 85°C) and the -1 variant designation which corresponds to the specific rise time accelerator configuration. Ensure the DFN-8 package footprint matches the design requirements. Cross-reference the manufacturer part number with authorized distributors to confirm authenticity and compliance with RoHS standards.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when designing systems requiring robust protection against bus capacitance and live insertion events. The -1 variant is appropriate for applications needing strong pull-up currents via slew-limited switches rather than constant current sources. Consider the 2.9V minimum supply voltage constraint and ensure the system logic levels align with the 0.3•VCC noise margin specifications for reliable operation.

Signal Buffers, Repeaters, Splitters Part Context

This part belongs to the LTC4313 family of 2-wire bus buffers manufactured by Analog Devices. The 'IDD' suffix indicates the industrial temperature range variant, while the '-1' designator specifies the internal configuration of the rise time accelerators as slew-limited switches. It is distinct from the -2 and -3 variants which offer different acceleration methods or lower voltage support.

Signal Buffers, Repeaters, Splitters Replacement Considerations

LTC4313CDD-1#PBF: Commercial temperature grade variant (0°C to 70°C).

Signal Buffers, Repeaters, Splitters FAQ

How does the LTC4313-1 handle stuck bus conditions?

If both data and clock lines remain low for 45ms, the device disconnects the input from the output and generates up to sixteen clock pulses on the SCLOUT pin to attempt to free the stuck bus.

What is the function of the ENABLE pin?

Driving ENABLE low isolates the input and output sides and disables the rise time accelerators. Driving it high allows connection establishment after detecting a stop bit or idle condition.

Can the LTC4313-1 be used for level translation to voltages below 2.9V?

No, the LTC4313-1 and -2 variants are designed for bus supplies between 2.9V and 5.5V. Level translation to lower voltages like 1.5V or 1.8V requires the LTC4313-3 variant.