TCA4311A Series

2-bit bidirectional 2.7- to 5.5-V hot swappable 400-kHz I2C/SMBus buffer

Catalog

2-bit bidirectional 2.7- to 5.5-V hot swappable 400-kHz I2C/SMBus buffer

Part	Number of Channels	Package / Case	Package / Case [custom]	Package / Case	Applications	Type	Voltage - Supply [Min]	Voltage - Supply [Max]	Mounting Type	Input	Output	Current - Supply	Operating Temperature [Min]	Operating Temperature [Max]	Supplier Device Package	Package / Case [y]	Package / Case [x]
Texas Instruments TCA4311ADGKR	1	8-MSOP 8-TSSOP	0.118 in	3 mm	I2C - Hotswap	Accelerator Buffer	2.7 V	5.5 V	Surface Mount	2-Wire Bus	2-Wire Bus	5.1 mA	-40 °C	85 °C
Texas Instruments TCA4311DGKRG4	1	8-MSOP 8-TSSOP	0.118 in	3 mm	I2C - Hotswap	Accelerator Buffer	2.7 V	5.5 V	Surface Mount	2-Wire Bus	2-Wire Bus	5.1 mA	-40 °C	85 °C
Texas Instruments TCA4311ADR	1	8-SOIC			I2C - Hotswap	Accelerator Buffer	2.7 V	5.5 V	Surface Mount	2-Wire Bus	2-Wire Bus	5.1 mA	-40 °C	85 °C	8-SOIC	3.9 mm	0.154 in
Texas Instruments TCA4311DR	1	8-SOIC			I2C - Hotswap	Accelerator Buffer	2.7 V	5.5 V	Surface Mount	2-Wire Bus	2-Wire Bus	5.1 mA	-40 °C	85 °C	8-SOIC	3.9 mm	0.154 in

Catalog

2-bit bidirectional 2.7- to 5.5-V hot swappable 400-kHz I2C/SMBus buffer

Key Features

• Operating Power-Supply Voltage Range of 2.7 V to 5.5 VSupports Bidirectional Data Transfer of I2C Bus SignalsSDA and SCL Lines are Buffered Which Increases Fanout1-V Precharge on all SDA and SCL Lines Prevents Corruption During Live Board Insertion and Removal From BackplaneSDA and SCL Input Lines are Isolated From OutputsAccommodates Standard Mode and Fast Mode I2C DevicesImproved Noise ImmunityApplications Include Hot Board Insertion and Bus ExtensionLow ICCChip Disable of < 1 µAREADY Open-Drain OutputSupports Clock Stretching, Arbitration, and SynchronizationPowered-Off High-Impedance I2C PinsOpen-Drain I2C PinsLatch-Up Performance Exceeds 100 mA Per JESD 78, Class IIESD Protection Exceeds JESD 228000-V Human-Body Model (A114-A)200-V Machine Model (A115-A)1000-V Charged-Device Model (C101)Operating Power-Supply Voltage Range of 2.7 V to 5.5 VSupports Bidirectional Data Transfer of I2C Bus SignalsSDA and SCL Lines are Buffered Which Increases Fanout1-V Precharge on all SDA and SCL Lines Prevents Corruption During Live Board Insertion and Removal From BackplaneSDA and SCL Input Lines are Isolated From OutputsAccommodates Standard Mode and Fast Mode I2C DevicesImproved Noise ImmunityApplications Include Hot Board Insertion and Bus ExtensionLow ICCChip Disable of < 1 µAREADY Open-Drain OutputSupports Clock Stretching, Arbitration, and SynchronizationPowered-Off High-Impedance I2C PinsOpen-Drain I2C PinsLatch-Up Performance Exceeds 100 mA Per JESD 78, Class IIESD Protection Exceeds JESD 228000-V Human-Body Model (A114-A)200-V Machine Model (A115-A)1000-V Charged-Device Model (C101)

Description

The TCA4311A is a hot-swappable I2C bus buffer that supports I/O card insertion into a live backplane without corruption of the data and clock busses. 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, 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 chip. When the I2C bus is idle, the TCA4311A can be put into shutdown mode by setting the EN pin low. When EN is high, the TCA4311A 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. Both the backplane and card may be powered with supply voltages ranging from 2.7 V to 5.5 V, with no restrictions on which supply voltage is higher. The TCA4311A has standard open-drain I/Os. The size of the pull-up resistors to the I/Os depends on the system, but each side of this buffer must have a pull-up resistor. The device is designed to work with Standard Mode and Fast Mode I2C devices in addition to SMBus devices. Standard Mode I2C devices only specify 3 mA in a generic I2C system where Standard Mode devices and multiple masters are possible. Under certain conditions, high termination currents can be used. The TCA4311A is a hot-swappable I2C bus buffer that supports I/O card insertion into a live backplane without corruption of the data and clock busses. 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, 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 chip. When the I2C bus is idle, the TCA4311A can be put into shutdown mode by setting the EN pin low. When EN is high, the TCA4311A 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. Both the backplane and card may be powered with supply voltages ranging from 2.7 V to 5.5 V, with no restrictions on which supply voltage is higher. The TCA4311A has standard open-drain I/Os. The size of the pull-up resistors to the I/Os depends on the system, but each side of this buffer must have a pull-up resistor. The device is designed to work with Standard Mode and Fast Mode I2C devices in addition to SMBus devices. Standard Mode I2C devices only specify 3 mA in a generic I2C system where Standard Mode devices and multiple masters are possible. Under certain conditions, high termination currents can be used.