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Manufacturer Part #


PCA9510A Series 5.5 V 400 kHz Hot Swappable I2C-Bus and SMBus Bus Buffer-TSSOP-8

ECAD Model:
Mfr. Name: NXP
Standard Pkg:
Product Variant Information section
Date Code: 2116
Product Specification Section
Technical Attributes
Attributes Table
Interface Circuit Type: I2C/SMBus
No of Channels: 1
Clock Frequency-Max: 400kHz
Supply Voltage-Nom: 2.7V to 5.5V
Supply Current: 3.5mA to 6mA
Package Style:  TSSOP-8
Mounting Method: Surface Mount
Features & Applications

The PCA9510A is a hot swappable I2C-bus and SMBus buffer that allows I/O card insertion into a live backplane without corrupting the data and clock buses. Control circuitry prevents the backplane from being connected to the card until a stop command or bus idle occurs on the backplane without bus contention on the card. When the connection is made, the PCA9510A provides bidirectional buffering, keeping the backplane and card capacitances isolated.

The PCA9510A has no rise time accelerator circuitry to prevent interference when there are multiple devices in the same system. The PCA9510A incorporates a digital ENABLE input pin, which enables the device when asserted HIGH and forces the device into a Low current mode when asserted LOW, and an open-drain READY output pin, which indicates that the backplane and card sides are connected together (HIGH) or not (LOW).


  • Bidirectional buffer for SDA and SCL lines increases fan-out and prevents SDA and SCL corruption during live board insertion and removal from multipoint backplane systems
  • Compatible with Standard-mode I2C-bus, Fast-mode I2C-bus, and SMBus standards
  • Active HIGH ENABLE input
  • Active HIGH READY open-drain output
  • High-impedance SDAn and SCLn pins for VCC = 0 V
  • 1 V precharge on SDAIN and SCLIN inputs
  • Supports clock stretching and multiple master arbitration and synchronization
  • Operating power supply voltage range: 2.7 V to 5.5 V
  • 5 V tolerant I/Os
  • 0 Hz to 400 kHz clock frequency



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