Linear LTCR4314带2线总线复接器的热插拔解决方案

Linear公司的 LTCR4314是4路2线总线复接器的热插拔，支持1.5V,1.8V,2.5V,3.3V 和5V总线间的电平转换，2线总线的1：4复接器/开关，和I2C，快速I2CC和SMBus兼容，主要用在通信系统和ATCA，地址扩展器，电平转移器，容性缓冲器/总线扩展器，带电板插入和PMBus。本文介绍了LTCR4314主要特性，方框图以及多种应用连接图。
The LTCR4314 is a hot-swappable 4-channel 2-wire bus multiplexer that allows one upstream bus to connect to any combination of downstream busses or channels.
An individual enable pin controls each connection. The LTC4314 provides bidirectional buffering, keeping the upstream bus capacitance isolated from the downstream bus capacitances. The high noise margin allows the LTC4314 to be interoperable with I2C devices that drive a high VOL (> 0.4V). The LTC4314 supports level translation between 1.5V, 1.8V, 2.5V, 3.3V and 5V busses. The hot-swappable nature of the LTC4314 allows I/O card insertion into, and removal from, a live backplane without corruption of the data and clock busses.
If both data and clock are not simultaneously high at least once in 45ms and DISCEN is high, a FAULT signal is generated indicating a stuck bus low condition, the input is disconnected from all enabled output channels, and up to 16 clocks are generated on the enabled downstream busses. A three state ACC pin enables input and output side rise time accelerators of varying strengths and sets the VIL,RISING voltage.
LTCR4314主要特性：
1:4 Multiplexer/Switch for 2-Wire Bus
Bidirectional Buffer for SDA and SCL Lines
High Noise Margin with VIL = 0.3•VCC
ENABLE Pins Connect SDA and SCL Lines
Selectable Rise Time Accelerator Current and Activation Voltage
Level Shift 1.5V, 1.8V, 2.5V, 3.3V and 5V Busses
Prevents SDA and SCL Corruption During Live Board
Insertion and Removal from Backplane
Stuck Bus Disconnect and Recovery
Compatible with I2C, I2C Fast Mode and SMBus
±4kV Human Body Model (HBM) ESD Ruggedness
20-Lead SSOP and 3mmx4mm QFN Packag...