Product details

Features Buffer, Enable Pin, Hot swap Frequency (Max) (kHz) 400 VCCA (Min) (V) 2.3 VCCA (Max) (V) 5.5 VCCB (Min) (V) 2.3 VCCB (Max) (V) 5.5 Supply restrictions VCC Single Supply Rating Catalog Operating temperature range (C) -40 to 125
Features Buffer, Enable Pin, Hot swap Frequency (Max) (kHz) 400 VCCA (Min) (V) 2.3 VCCA (Max) (V) 5.5 VCCB (Min) (V) 2.3 VCCB (Max) (V) 5.5 Supply restrictions VCC Single Supply Rating Catalog Operating temperature range (C) -40 to 125
VSSOP (DGK) 8 15 mm² 3 x 4.9
  • Supports bidirectional data transfer of I2C bus signals
  • Operating power-supply voltage range of 2.3 V to 5.5 V
  • TA ambient air temperature range of -40 °C to 125 °C
  • 1-V Precharge on all SDA and SCL lines prevents corruption during live insertion
  • Accommodates standard mode and fast mode I2C devices
  • Supports clock stretching, arbitration and synchronization
  • Powered-off high-impedance I2C pins
  • Supports bidirectional data transfer of I2C bus signals
  • Operating power-supply voltage range of 2.3 V to 5.5 V
  • TA ambient air temperature range of -40 °C to 125 °C
  • 1-V Precharge on all SDA and SCL lines prevents corruption during live insertion
  • Accommodates standard mode and fast mode I2C devices
  • Supports clock stretching, arbitration and synchronization
  • Powered-off high-impedance I2C pins

The TCA9511A is a hot-swappable I2C bus buffer that supports I/O card insertion into a live backplane without corruption of the data and clock lines. Control circuitry prevents the backplane-side I2C lines (in) from being connected to the card-side I2C lines (out) until a stop command or bus idle condition occurs on the backplane without bus contention on the card. When the connection is made, this device provides bidirectional buffering, keeping the backplane and card capacitances isolated. During insertion, the SDA and SCL lines are pre-charged to 1 V to minimize the current required to charge the parasitic capacitance of the device.

When the I2C bus is idle, the TCA9511A can be put into shutdown mode by setting the EN pin low, reducing power consumption. When EN is pulled high, the TCA9511A resumes normal operation. It also includes an open drain READY output pin, which indicates that the backplane and card sides are connected together. When READY is high, the SDAIN and SCLIN are connected to SDAOUT and SCLOUT. When the two sides are disconnected, READY is low.

The TCA9511A is a hot-swappable I2C bus buffer that supports I/O card insertion into a live backplane without corruption of the data and clock lines. Control circuitry prevents the backplane-side I2C lines (in) from being connected to the card-side I2C lines (out) until a stop command or bus idle condition occurs on the backplane without bus contention on the card. When the connection is made, this device provides bidirectional buffering, keeping the backplane and card capacitances isolated. During insertion, the SDA and SCL lines are pre-charged to 1 V to minimize the current required to charge the parasitic capacitance of the device.

When the I2C bus is idle, the TCA9511A can be put into shutdown mode by setting the EN pin low, reducing power consumption. When EN is pulled high, the TCA9511A resumes normal operation. It also includes an open drain READY output pin, which indicates that the backplane and card sides are connected together. When READY is high, the SDAIN and SCLIN are connected to SDAOUT and SCLOUT. When the two sides are disconnected, READY is low.

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Type Title Date
* Data sheet TCA9511A Hot Swappable I2C Bus and SMBus Buffer datasheet (Rev. C) 25 Sep 2020
Certificate TCA9511AEVM EU Declaration of Conformity (DoC) 18 Aug 2020
Application note I2C Solutions for Hot Swap Applications 31 Jan 2020
User guide EVM User's Guide for TCA9511A 04 Sep 2019

Design & development

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Evaluation board

TCA9511AEVM — Hot-swappable two-wire bus buffer evaluation module

This EVM provides configurable loading conditions through adjustable pull up resistors and bus capacitance which allows designers to easily test the performance of this device in their system. The EVM can be populated with a socket to test over temperature as well.
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Simulation model

TCA9511A IBIS Model

SCPM046.ZIP (44 KB) - IBIS Model
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