Datasheet LTC4307 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Low Offset Hot Swappable 2-Wire Bus Buffer with Stuck Bus Recovery |
| Pages / Page | 16 / 1 — FEATURES. DESCRIPTIO. Bidirectional Buffer with Stuck Bus Recovery. 60mV … |
| File Format / Size | PDF / 181 Kb |
| Document Language | English |
FEATURES. DESCRIPTIO. Bidirectional Buffer with Stuck Bus Recovery. 60mV Buffer Offset Independent of Load
Model Line for this Datasheet
- LTC4307CDD#PBF LTC4307CDD#PBF LTC4307CDD#TRPBF LTC4307CDD#TRPBF LTC4307CMS8#PBF LTC4307CMS8#PBF LTC4307CMS8#TRPBF LTC4307CMS8#TRPBF LTC4307IDD#PBF LTC4307IDD#PBF LTC4307IDD#TRPBF LTC4307IDD#TRPBF LTC4307IMS8#3ZZPBF LTC4307IMS8#3ZZTRPBF LTC4307IMS8#PBF LTC4307IMS8#PBF LTC4307IMS8#TRPBF LTC4307IMS8#TRPBF
Text Version of Document
LTC4307 Low Offset Hot Swappable 2-Wire Bus Buffer with Stuck Bus Recovery
U FEATURES DESCRIPTIO
■
Bidirectional Buffer with Stuck Bus Recovery
The LTC®4307 hot swappable, 2-wire bus buffer allows ■
60mV Buffer Offset Independent of Load
I/O card insertion into a live backplane without corrup- ■
30ms Stuck Bus Timeout
tion of the data and clock busses. The LTC4307 provides ■
Compatible with Non-Compliant VOL I2C Devices
bidirectional buffering, keeping the backplane and card ■
Prevents SDA and SCL Corruption During Live
capacitances isolated. Low offset and high VOL tolerance
Board Insertion and Removal from Backplane
allows multiple devices to be cascaded on the clock and ■
±5kV Human Body Model ESD Protection
data busses. If SDAOUT or SCLOUT are low for 30ms, the ■ Isolates Input SDA and SCL Line from Output LTC4307 will automatically break the bus connection. At ■ Compatible with I2CTM, I2C Fast Mode and SMBus this time the LTC4307 automatically generates up to 16 ■ READY Open-Drain Output clock pulses on SCLOUT in an attempt to free the bus. A ■ 1V Precharge on All SDA and SCL Lines connection will resume if the stuck bus is cleared. ■ High Impedance SDA, SCL Pins for VCC = 0V During insertion, the SDA and SCL lines are pre-charged ■ Small 8-Lead (3mm × 3mm) DFN and 8-Lead MSOP to 1V to minimize bus disturbances. When driven high, Packages the ENABLE input allows the LTC4307 to connect after a
U
stop bit or bus idle. Driving ENABLE low breaks the con-
APPLICATIO S
nection between SDAIN and SDAOUT, SCLIN and SCLOUT. ■ READY is an open-drain output which indicates that the Live Board Insertion ■ backplane and card sides are connected. Servers ■ Capacitance Buffer/Bus Extender , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ RAID Systems Protected by U.S. Patents, including 7032051, 6356140, 6650174 ■ ATCA
U TYPICAL APPLICATIO
3.3V
Rising Edge from Asserted Low
0.01μF 1000 10k 10k V 2.7k 2.7k 10k 10k 0.01μF CC VCC ENABLE ENABLE 800 100k LTC4307 LTC4307 MICRO- CONTROLLER SCLIN SCLOUT SCLIN SCLOUT CARD_SCL 600 LOW OFFSET SDAOUT SDAIN SDAOUT SDAIN SDAOUT CARD_SDA 200mV/DIV 400 3.3V 3.3V SDAIN 10k 10k 200 READY READY GND GND 4307 TA01a 0 0 100 200 300 400 500 600 100ns/DIV 4307 TA01b BACKPLANE CARD CARD CONNECTOR CONNECTOR 4307f 1
U FEATURES DESCRIPTIO
■
Bidirectional Buffer with Stuck Bus Recovery
The LTC®4307 hot swappable, 2-wire bus buffer allows ■
60mV Buffer Offset Independent of Load
I/O card insertion into a live backplane without corrup- ■
30ms Stuck Bus Timeout
tion of the data and clock busses. The LTC4307 provides ■
Compatible with Non-Compliant VOL I2C Devices
bidirectional buffering, keeping the backplane and card ■
Prevents SDA and SCL Corruption During Live
capacitances isolated. Low offset and high VOL tolerance
Board Insertion and Removal from Backplane
allows multiple devices to be cascaded on the clock and ■
±5kV Human Body Model ESD Protection
data busses. If SDAOUT or SCLOUT are low for 30ms, the ■ Isolates Input SDA and SCL Line from Output LTC4307 will automatically break the bus connection. At ■ Compatible with I2CTM, I2C Fast Mode and SMBus this time the LTC4307 automatically generates up to 16 ■ READY Open-Drain Output clock pulses on SCLOUT in an attempt to free the bus. A ■ 1V Precharge on All SDA and SCL Lines connection will resume if the stuck bus is cleared. ■ High Impedance SDA, SCL Pins for VCC = 0V During insertion, the SDA and SCL lines are pre-charged ■ Small 8-Lead (3mm × 3mm) DFN and 8-Lead MSOP to 1V to minimize bus disturbances. When driven high, Packages the ENABLE input allows the LTC4307 to connect after a
U
stop bit or bus idle. Driving ENABLE low breaks the con-
APPLICATIO S
nection between SDAIN and SDAOUT, SCLIN and SCLOUT. ■ READY is an open-drain output which indicates that the Live Board Insertion ■ backplane and card sides are connected. Servers ■ Capacitance Buffer/Bus Extender , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ RAID Systems Protected by U.S. Patents, including 7032051, 6356140, 6650174 ■ ATCA
U TYPICAL APPLICATIO
3.3V
Rising Edge from Asserted Low
0.01μF 1000 10k 10k V 2.7k 2.7k 10k 10k 0.01μF CC VCC ENABLE ENABLE 800 100k LTC4307 LTC4307 MICRO- CONTROLLER SCLIN SCLOUT SCLIN SCLOUT CARD_SCL 600 LOW OFFSET SDAOUT SDAIN SDAOUT SDAIN SDAOUT CARD_SDA 200mV/DIV 400 3.3V 3.3V SDAIN 10k 10k 200 READY READY GND GND 4307 TA01a 0 0 100 200 300 400 500 600 100ns/DIV 4307 TA01b BACKPLANE CARD CARD CONNECTOR CONNECTOR 4307f 1
