Datasheet > LTACG

LTACG

更新时间： 2024-11-27 11:42:23

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
16页	282K
描述
Hot Swappable 2-Wire Bus Buffers

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中文翻译

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数据手册

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LTACG 数据手册

LTC4300A-1/LTC4300A-2

Hot Swappable

2-Wire Bus Buffers

DESCRIPTIO

FEATURES

■

Bidirectional Buffer for SDA and SCL Lines

The LTC^®4300A series hot swappable 2-wire bus buffers

allow I/O card insertion into a live backplane without

corruption of the data and clock busses. When the con-

nection is made, the LTC4300A-1/LTC4300A-2 provide

bidirectional buffering, keeping the backplane and card

capacitances isolated. Rise-time accelerator circuitry*

allows the use of weaker DC pull-up currents while still

meeting rise-time requirements. During insertion, the

SDA and SCL lines are precharged to 1V to minimize bus

disturbances.

Increases Fanout

■

Prevents SDA and SCL Corruption During Live

Board Insertion and Removal from Backplane

■

Isolates Input SDA and SCL Lines from Output

Compatible with I²C^TM, I²C Fast Mode and SMBus

■

Standards (Up to 400kHz Operation)

Small MSOP 8-Pin Package

■

Low I_CCChip Disable: <1µA (LTC4300A-1)

■

READY Open Drain Output (LTC4300A-1)

■

1V Precharge on all SDA and SCL Lines

The LTC4300A-1 incorporates a CMOS threshold digital

ENABLE input pin, which forces the part into a low current

modewhendriventogroundandsetsnormaloperationwhen

driven to V_CC. It also includes an open drain READY output

pin, which indicates that the backplane and card sides are

connectedtogether. TheLTC4300A-2replacestheENABLE

pin with a dedicated supply voltage pin, V_CC2, for the card

side, providinglevelshiftingbetween3.3Vand5Vsystems.

Both the backplane and card may be powered with supply

voltages ranging from 2.7V to 5.5V, with no contraints on

which supply voltage is higher. The LTC4300A-2 also re-

places the READY pin with a digital CMOS input pin, ACC,

whichenablesanddisablestherise-timeacceleratorcurrents.

■

Supports Clock Stretching, Arbitration and

Synchronization

■

5V to 3.3V Level Translation (LTC4300A-2)

■

High Impedance SDA, SCL Pins for V_CC= 0V

APPLICATIO S

■

Hot Board Insertion

Servers

■

Capacitance Buffer/Bus Extender

■

Desktop Computer

, LTC and LT are registered trademarks of Linear Technology Corporation.

I²C is a trademark of Philips Electronics N. V.

*U.S. Patent No. 6,650,174

The LTC4300A is available in a small 8-pin MSOP package.

TYPICAL APPLICATIO

Input–Output Connection t_PLH

3.3V

0.01µF

10k

SCLIN

SCLOUT

OUTPUT

SIDE

50pF

INPUT

SIDE

150pF

SDAIN

SDAOUT

LTC4300A-1

ENABLE

READY

GND

4300A TA02

4300A-1/2 TA01

sn4300a12 4300a12fs

12 3 4 5 6 7...16

中文翻译

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