LTC4304是具阻塞总线恢复功能的可热插拔型二线式总线缓冲器

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LTC4304 - 典型应用图例：

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LTC4304 - LTC4304是具阻塞总线恢复功能的可热插拔型二线式总线缓冲器

LTC4304是Linear公司的一款I2C 和 SMBus 总线缓冲器和加速器产品，LTC4304是具阻塞总线恢复功能的可热插拔型二线式总线缓冲器，本站介绍了LTC4304的封装应用图解、特点和优点、功能等，并给出了与LTC4304相关的凌力尔特元器件型号供参考。

LTC4304 - 具阻塞总线恢复功能的可热插拔型二线式总线缓冲器

LTC4304 - 具阻塞总线恢复功能的可热插拔型二线式总线缓冲器 - Linear Technology（凌力尔特）

功能描述

The LTC4304 hot swappable 2-wire bus buffer allows I/O card insertion into a live backplane without corruption of the data and clock busses. When a connection is made, the LTC4304 provides bidirectional buffering, keeping the backplane and card capacitances isolated. If SDAOUT or SCLOUT is low for ≥30ms (typ), the LTC4304 automatically breaks the data and clock bus connection and FAULT will pull low. At this time the LTC4304 automatically generates up to 16 clock pulses on SCLOUT in an attempt to free the bus. A connection will be enabled automatically when the bus becomes free. A logic low on the ACC input enables the LTC4304's rise-time accelerators. A logic high on ACC disables the rise-time accelerators, which allows SDA and SCL bus pull-up voltages below VCC.

During insertion, the SDA and SCL lines are precharged to 1V to minimize bus disturbances. When driven high, ENABLE allows the LTC4304 to connect after a stop bit or bus idle occurs. Driving ENABLE low breaks the connection between SDAIN and SDAOUT, SCLIN and SCLOUT. READY is an open drain output that indicates when the backplane and card sides are connected together.

*Patent Pending

特点

Automatic Disconnect of SDA/SCL Lines when Bus is Stuck Low for ≥30ms

Fault Flag for Stuck Bus

Recovers Stuck Busses with Automatic Clocking*

Bidirectional Buffer* for SDA and SCL Lines Increases Fanout

Prevents SDA and SCL Corruption During Live Board Insertion and Removal from Backplane

Allows Bus Pullup Voltages Above and Below VCC

±15kV Human Body Model ESD Protection

Isolates Input SDA and SCL Lines from Output

Compatible with I2CTM, I2C Fast-Mode and SMBus Standards (Up to 400kHz Operation)

READY Open Drain Output

1V Precharge on All SDA and SCL Lines

High Impedance SDA, SCL Pins for VCC = 0V

ENABLE Gates Connection from Input to Output

MSOP 10-Pin and DFN (3mm × 3mm) Packages

应用

Hot Board Insertion

Servers

Capacitance Buffer/Bus Extender

RAID Systems

以下列出了不同封装及包装形式的具体型号,并标出了直接在linear官网上订货的价格（美元）

器件型号	封装	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量)
LTC4304CDD	3x3 DFN-10	C	$3.21	$2.25
LTC4304CDD#PBF	3x3 DFN-10	C	$3.21	$2.25
LTC4304CDD#TR	3x3 DFN-10	C		$2.31
LTC4304CDD#TRPBF	3x3 DFN-10	C		$2.31
LTC4304CMS	MS-10	C	$3.14	$2.20
LTC4304CMS#PBF	MS-10	C	$3.14	$2.20
LTC4304CMS#TR	MS-10	C		$2.26
LTC4304CMS#TRPBF	MS-10	C		$2.26
LTC4304IDD	3x3 DFN-10	I	$3.86	$2.70
LTC4304IDD#PBF	3x3 DFN-10	I	$3.86	$2.70
LTC4304IDD#TR	3x3 DFN-10	I		$2.76
LTC4304IDD#TRPBF	3x3 DFN-10	I		$2.76
LTC4304IMS	MS-10	I	$3.77	$2.64
LTC4304IMS#PBF	MS-10	I	$3.77	$2.64
LTC4304IMS#TR	MS-10	I		$2.70
LTC4304IMS#TRPBF	MS-10	I		$2.70