TCA9511A Series
2-bit bidirectional 2.3- to 5.5-V hot swappable 400-kHz I2C/SMBus buffer
Manufacturer: Texas Instruments
Catalog
2-bit bidirectional 2.3- to 5.5-V hot swappable 400-kHz I2C/SMBus buffer
Key Features
• Supports bidirectional data transfer of I2C bus signalsOperating power-supply voltage range of 2.3 V to 5.5 VTAambient air temperature range of -40 °C to 125 °C1-V Precharge on all SDA and SCL lines prevents corruption during live insertionAccommodates standard mode and fast mode I2C devicesSupports clock stretching, arbitration and synchronizationPowered-off high-impedance I2C pinsSupports bidirectional data transfer of I2C bus signalsOperating power-supply voltage range of 2.3 V to 5.5 VTAambient air temperature range of -40 °C to 125 °C1-V Precharge on all SDA and SCL lines prevents corruption during live insertionAccommodates standard mode and fast mode I2C devicesSupports clock stretching, arbitration and synchronizationPowered-off high-impedance I2C pins
Description
AI
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.
