PCA9507D,118

Signal Buffers, Repeaters, Splitters Overview

The PCA9507D,118 is a 2-wire serial bus extender manufactured by NXP USA Inc. in an SO8 package. It provides bidirectional buffering for I2C-bus and SMBus applications with voltage level translation between 2.7 V and 5.5 V on both ports. The device supports clock frequencies up to 400 kHz and includes a rise time accelerator on Port A to drive loads up to 1400 pF or extend cables up to 18 meters. It features an active HIGH enable input, open-drain outputs, and overvoltage tolerant pins that remain high-impedance when unpowered.

Signal Buffers, Repeaters, Splitters Feature Summary

• Provides bidirectional buffering for data (SDA) and clock (SCL) lines to isolate bus capacitance.
• Integrates a rise time accelerator on Port A to support heavy capacitive loads and long cable distances.
• Features static level offset on Port B drivers to prevent lock-up conditions when interfacing with other buffers.
• Supports arbitration and clock stretching across the repeater while maintaining I2C-bus compatibility.

Signal Buffers, Repeaters, Splitters Applications

• HDMI DDC line extension for digital video players, recorders, and set-top boxes.
• I2C-bus and SMBus signal buffering between devices operating at different supply voltages.
• System designs requiring isolation of bus capacitance to meet HDMI DDC version 1.3 distance specifications.

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific ordering suffix '118' against the manufacturer's current documentation to confirm package type and compliance status. Confirm RoHS3 compliance and REACH status requirements prior to integration. Ensure the design accounts for the component's power-up sequence behavior where drivers remain off until both supply rails exceed 2.7 V.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when system architecture requires extending I2C or SMBus lines beyond standard capacitance limits or distance constraints. It is suitable for replacing PCA9517 in cable applications where Port A rise time acceleration is necessary. Verify that the application does not connect Port B directly to devices featuring rise time accelerators due to the static level offset design.

Signal Buffers, Repeaters, Splitters Part Context

The PCA9507D,118 belongs to the PCA9507 family of 2-wire serial bus extenders. The 'D' suffix indicates the SO8 plastic small outline package variant. This series is designed specifically for HDMI DDC applications and general I2C/SMBus systems requiring reliable signal transmission over extended distances or through multiple masters.

Signal Buffers, Repeaters, Splitters Replacement Considerations

PCA9517

Signal Buffers, Repeaters, Splitters FAQ

Can Port B be connected to another device with a rise time accelerator?

No, the Port B drivers have a static level offset and must not be connected to devices with rise time accelerators, such as the PCA9510, PCA9511, PCA9512, PCA9513, PCA9514, PCA9515, PCA9516A, PCA9517, or PCA9518.

How does the enable pin function during operation?

The EN pin is active HIGH with an internal pull-up. It should only change state when the global bus and buffer port are idle; changing its state during an I2C-bus operation can hang the bus or confuse enabled parts.

What is the maximum bus extension distance supported?

The device allows up to 18 meters of bus extension, which exceeds the maximum distance specification for HDMI DDC.