The LTC4312IMS#PBF is a hot-swappable 2-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 LTC4312IMS#PBF provides bidirectional buffering, keeping the upstream bus capacitance isolated from the downstream bus capacitances. The high noise margin allows the LTC4312IMS#PBF to be interoperable with I2C devices that drive a high VOL (> 0.4V). The LTC4312IMS#PBF supports level translation between 1.5V, 1.8V, 2.5V, 3.3V and 5V busses. The hot-swappable nature of the LTC4312IMS#PBF 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 each enabled output channel 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.
Applications- Telecommunications Systems Including ATCA
- Address Expansion
- Level Translator
- Capacitance Buffers/Bus Extender
- Live Board Insertion
- PMBus
Feature
- 1:2 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
- 14-Lead 4mm × 3mm DFN and 16-Lead MSOP Packages
Applications
- Telecommunications Systems Including ATCA
- Address Expansion
- Level Translator
- Capacitance Buffers/Bus Extender
- Live Board Insertion
- PMBus
(Picture: Pinout)
