TCA4311A datasheet(8/22 Pages) TI1

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TCA4311A Datasheet(PDF) 8 Page - Texas Instruments

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Part #	TCA4311A

Description	HOT SWAPPABLE 2-WIRE BUS BUFFERS

Download	22 Pages

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Manufacturer	TI1 [Texas Instruments]

Direct Link	http://www.ti.com

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8 / 22 page

TCA4311A

SCPS226 – JANUARY 2011

www.ti.com

Resistor Pull-Up Value Selection

The system pullup resistors must be strong enough to provide a positive slew rate of 1.25 V/ms on the SDA and

SCL pins, in order to activate the boost pullup currents during rising edges. Choose maximum resistor value R

using the formula:

≤ (VCC(MIN) – 0.6) (800,000) / C

where R is the pullup resistor value in ohms, VCC(MIN) is the minimum VCC voltage and C is the equivalent bus

capacitance in picofarads (pF).

In addition, regardless of the bus capacitance, always choose R

≤ 16 kΩ for VCC = 5.5 V maximum, R ≤ 24 kΩ

for VCC = 3.6 V maximum. The start-up circuitry requires logic high voltages on SDAOUT and SCLOUT to

connect the backplane to the card, and these pullup values are needed to overcome the precharge voltage.

Systems With Disparate Supply Voltages

In large 2-wire systems, the VCC voltages seen by devices at various points in the system can differ by a few

hundred millivolts or more. This situation is well modeled by a series resistor in the VCC line, as shown in

Figure 15. For proper operation of the TCA4311A, make sure that VCC(BUS) ≥ VCC(TCA4311A) – 0.5 V.

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Product Folder Link(s): TCA4311A

Manufacturer	Part #	Datasheet	Description
Texas Instruments	TCA4311	567Kb / 21P	[Old version datasheet] HOT SWAPPABLE 2-WIRE BUS BUFFERS
	TCA4311	532Kb / 21P	[Old version datasheet] HOT SWAPPABLE 2-WIRE BUS BUFFERS
	TCA4311D	567Kb / 21P	[Old version datasheet] HOT SWAPPABLE 2-WIRE BUS BUFFERS
	TCA4311D	532Kb / 21P	[Old version datasheet] HOT SWAPPABLE 2-WIRE BUS BUFFERS
	TCA4311DG4	567Kb / 21P	[Old version datasheet] HOT SWAPPABLE 2-WIRE BUS BUFFERS

Manufacturer	Part #	Datasheet	Description
Texas Instruments	TCA4311	532Kb / 21P	[Old version datasheet] HOT SWAPPABLE 2-WIRE BUS BUFFERS
Linear Technology	LTC4300A-1	286Kb / 16P	Hot Swappable 2-Wire Bus Buffers
	LTC4300A-2	187Kb / 16P	Hot Swappable 2-Wire Bus Buffers
	LTC4300-1	287Kb / 16P	Hot Swappable 2-Wire Bus Buffers
	LTC4300A-1	187Kb / 16P	Hot Swappable 2-Wire Bus Buffers
Texas Instruments	TCA4311	567Kb / 21P	[Old version datasheet] HOT SWAPPABLE 2-WIRE BUS BUFFERS
Linear Technology	LTC4300-1	742Kb / 18P	Hot Swappable 2-Wire Bus Buffers
	LTC4300-2	742Kb / 18P	Hot Swappable 2-Wire Bus Buffers
	LTC4301	223Kb / 12P	Supply Independent Hot Swappable 2-Wire Bus Buffer
	LTC4301	228Kb / 12P	Supply Independent Hot Swappable 2-Wire Bus Buffer

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