Datasheet LTC4308 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Low Voltage, Level Shifting Hot Swappable 2-Wire Bus Buffer with Stuck Bus Recovery |
| Pages / Page | 16 / 1 — FEATURES. DESCRIPTION. Optimized for Low Voltage Systems Down to 0.9V. … |
| File Format / Size | PDF / 172 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. Optimized for Low Voltage Systems Down to 0.9V. Bidirectional Buffer with Stuck Bus Recovery
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LTC4308 Low Voltage, Level Shifting Hot Swappable 2-Wire Bus Buffer with Stuck Bus Recovery
FEATURES DESCRIPTION
n
Optimized for Low Voltage Systems Down to 0.9V
The LTC®4308 hot swappable, 2-wire bus buffer allows n
Bidirectional Buffer with Stuck Bus Recovery
I/O card insertion into a live backplane without corrup- n
–200mV Offset In-Out/+300mV Offset Out-In
tion of the data and clock busses. The LTC4308 provides n
30ms Stuck Bus Timeout
bidirectional buffering, keeping the backplane and card n
Compatible with Non-Compliant VOL I2C Devices
capacitances isolated. Negative offset from output to n
Prevents SDA and SCL Corruption During Live
input allows communication between output bus devices
Board Insertion and Removal from Backplane
with high VOL and devices on the low voltage input side, n
±6kV Human Body Model (HBM) ESD Protection
where bus supplies can be as low as 0.9V. If SDAOUT or n Isolates Input SDA and SCL Lines from Output SCLOUT are low for 30ms, the LTC4308 will automati- n Compatible with I2C™, I2C Fast Mode and SMBus cally break the Input-Output connection. At this time the n READY Open-Drain Output LTC4308 automatically generates up to 16 clock pulses n 1V Precharge on SDAOUT and SCLOUT Lines on SCLOUT in an attempt to free the bus. A connection n Small 8-Lead (3mm × 3mm × 0.75mm) DFN and will resume if the stuck bus is cleared. 8-Lead MSOP Packages During insertion, the SDAOUT and SCLOUT lines are pre- charged to 1V to minimize bus disturbances. When driven
APPLICATIONS
high, the ENABLE input allows the LTC4308 to connect after n a stop bit or bus idle condition. Driving ENABLE low breaks Live Board Insertion n the connection between SDAIN and SDAOUT, SCLIN and Servers n SCLOUT. READY is an open-drain output which indicates Capacitance Buffer/Bus Extender n that the backplane and card sides are connected. RAID Systems n ATCA L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 7032051, 6650174, 6356140.
TYPICAL APPLICATION The LTC4308 in a 1.2V 1.2V to 5V Level Shifting Microcontroller Application
SDAOUT 5V 1.2V 0.01μF 2V/DIV CH1 2.7k 2.7k V 10k 2.7k 2.7k CC LTC4308 SCLIN SCLOUT CARD_SCL SDAIN MICRO- CONTROLLER SDAIN SDAOUT CARD_SDA 0.5V/DIV CH2 ENABLE 4308 TA01a READY READY GND 1μs/DIV 4308 TA01b 4308f 1
FEATURES DESCRIPTION
n
Optimized for Low Voltage Systems Down to 0.9V
The LTC®4308 hot swappable, 2-wire bus buffer allows n
Bidirectional Buffer with Stuck Bus Recovery
I/O card insertion into a live backplane without corrup- n
–200mV Offset In-Out/+300mV Offset Out-In
tion of the data and clock busses. The LTC4308 provides n
30ms Stuck Bus Timeout
bidirectional buffering, keeping the backplane and card n
Compatible with Non-Compliant VOL I2C Devices
capacitances isolated. Negative offset from output to n
Prevents SDA and SCL Corruption During Live
input allows communication between output bus devices
Board Insertion and Removal from Backplane
with high VOL and devices on the low voltage input side, n
±6kV Human Body Model (HBM) ESD Protection
where bus supplies can be as low as 0.9V. If SDAOUT or n Isolates Input SDA and SCL Lines from Output SCLOUT are low for 30ms, the LTC4308 will automati- n Compatible with I2C™, I2C Fast Mode and SMBus cally break the Input-Output connection. At this time the n READY Open-Drain Output LTC4308 automatically generates up to 16 clock pulses n 1V Precharge on SDAOUT and SCLOUT Lines on SCLOUT in an attempt to free the bus. A connection n Small 8-Lead (3mm × 3mm × 0.75mm) DFN and will resume if the stuck bus is cleared. 8-Lead MSOP Packages During insertion, the SDAOUT and SCLOUT lines are pre- charged to 1V to minimize bus disturbances. When driven
APPLICATIONS
high, the ENABLE input allows the LTC4308 to connect after n a stop bit or bus idle condition. Driving ENABLE low breaks Live Board Insertion n the connection between SDAIN and SDAOUT, SCLIN and Servers n SCLOUT. READY is an open-drain output which indicates Capacitance Buffer/Bus Extender n that the backplane and card sides are connected. RAID Systems n ATCA L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 7032051, 6650174, 6356140.
TYPICAL APPLICATION The LTC4308 in a 1.2V 1.2V to 5V Level Shifting Microcontroller Application
SDAOUT 5V 1.2V 0.01μF 2V/DIV CH1 2.7k 2.7k V 10k 2.7k 2.7k CC LTC4308 SCLIN SCLOUT CARD_SCL SDAIN MICRO- CONTROLLER SDAIN SDAOUT CARD_SDA 0.5V/DIV CH2 ENABLE 4308 TA01a READY READY GND 1μs/DIV 4308 TA01b 4308f 1
