LTC4303 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®4303 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 LTC4303 provides bidirectional buffering, keeping the backplane and card capacitances isolated. If SDAOUT or SCLOUT is low for ≥ 30ms (typ), the LTC4303 automatically breaks the data and clock bus connection. At this time the LTC4303 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.

Rise-time accelerator circuitry allows the use of larger pull-up resistors while still meeting rise-time requirements. During insertion, the SDA and SCL lines are precharged to 1V to minimize bus disturbances. When driven high, ENABLE allows the LTC4303 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
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
Pin Compatible with LTC4300A-1
±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 8-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

LTC4303 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) *
LTC4303CDD	DFN	8	C	$3.07	$2.15
LTC4303CDD#PBF	DFN	8	C	$3.07	$2.15
LTC4303CDD#TRPBF	DFN	8	C		$2.21
LTC4303CMS8	MSOP	8	C	$3.00	$2.10
LTC4303CMS8#PBF	MSOP	8	C	$3.00	$2.10
LTC4303CMS8#TR	MSOP	8	C		$2.16
LTC4303CMS8#TRPBF	MSOP	8	C		$2.16
LTC4303IDD	DFN	8	I	$3.70	$2.58
LTC4303IDD#PBF	DFN	8	I	$3.70	$2.58
LTC4303IDD#TR	DFN	8	I		$2.64
LTC4303IDD#TRPBF	DFN	8	I		$2.64
LTC4303IMS8	MSOP	8	I	$3.61	$2.52
LTC4303IMS8#PBF	MSOP	8	I	$3.61	$2.52
LTC4303IMS8#TR	MSOP	8	I		$2.58
LTC4303IMS8#TRPBF	MSOP	8	I		$2.58

LTC4303 数据手册及相关资料下载

数据手册 (英文) : LTC4303 - Hot Swappable 2-Wire Bus Buffer with Stuck Bus Recovery.PDF
设计要点 (中文) : DN394 - 轻而易举地通过 HDMI 符合性测试.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