LTC4304 具阻塞总线恢复功能的可热插拔型二线式总线缓冲器

The LTC®4304 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

产品特点 Features

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

典型应用图

参数

LTC4304 订购信息和价格参考Package Variations and Pricing

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

LTC4304 数据手册及相关资料下载

数据手册 (英文) : LTC4304 - Hot Swappable 2-Wire Bus Buffer with Stuck Bus Recovery.PDF
可靠性数据 : R410 Reliability Data .PDF
产品选型卡 : I2C Muxes, Buffers & Accelerators.PDF
产品选型卡 : I2C Quick Guide.PDF