Specification	TCA4311ADGKR

Applications	I2C - Hotswap
Current - Supply	5.1 mA
Input	2-Wire Bus
Mounting Type	Surface Mount
Number of Channels	1
Operating Temperature [Max]	85 °C
Operating Temperature [Min]	-40 °C
Output	2-Wire Bus
Package / Case	8-MSOP, 8-TSSOP
Package / Case	3 mm
Package / Case [custom]	0.118 in
Type	Buffer, Accelerator
Voltage - Supply [Max]	5.5 V
Voltage - Supply [Min]	2.7 V

TCA4311A Series

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

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Cut Tape (CT)	1	$ 2.54
		10	$ 2.28
		25	$ 2.15
		100	$ 1.83
		250	$ 1.72
		500	$ 1.50
		1000	$ 1.25
	Digi-ReelÛ	1	$ 2.54
		10	$ 2.28
		25	$ 2.15
		100	$ 1.83
		250	$ 1.72
		500	$ 1.50
		1000	$ 1.25
	Tape & Reel (TR)	2500	$ 1.16
		5000	$ 1.12
Texas Instruments	LARGE T&R	1	$ 1.91
		100	$ 1.57
		250	$ 1.13
		1000	$ 0.85

Description

General part information

TCA4311A Series

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.

Documents

Technical documentation and resources

TCA4311A Hot Swappable 2-Wire Bus Buffers datasheet (Rev. C)

Data sheet