Datasheet LTC4303 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Hot Swappable 2-Wire Bus Buffer with Stuck Bus Recovery |
| Pages / Page | 12 / 1 — FEATURES. DESCRIPTIO. Automatic Disconnect of SDA/SCL Lines when Bus. is … |
| File Format / Size | PDF / 563 Kb |
| Document Language | English |
FEATURES. DESCRIPTIO. Automatic Disconnect of SDA/SCL Lines when Bus. is Stuck Low for ≥ 30ms
Model Line for this Datasheet
Text Version of Document
LTC4303 Hot Swappable 2-Wire Bus Buffer with Stuck Bus Recovery
U FEATURES DESCRIPTIO
■
Automatic Disconnect of SDA/SCL Lines when Bus
The LTC®4303 hot swappable 2-wire Bus Buffer allows I/O
is Stuck Low for ≥ 30ms
card insertion into a live backplane without corruption of ■
Recovers Stuck Busses with Automatic Clocking*
the data and clock busses. When a connection is made, ■
Bidirectional Buffer* for SDA and SCL Lines
the LTC4303 provides bidirectional buffering, keeping the
Increases Fanout
backplane and card capacitances isolated. If SDAOUT or ■
Prevents SDA and SCL Corruption During Live
SCLOUT is low for ≥ 30ms (typ), the LTC4303 automatically
Board Insertion and Removal from Backplane
breaks the data and clock bus connection. At this time the ■
Pin Compatible with LTC4300A-1
LTC4303 automatically generates up to 16 clock pulses on ■
±15kV Human Body Model ESD Protection
SCLOUT in an attempt to free the bus. A connection will ■ Isolates Input SDA and SCL Lines from Output be enabled automatically when the bus becomes free. ■ Compatible with I2CTM, I2C Fast-Mode and SMBus Rise-time accelerator circuitry allows the use of larger pull- Standards (Up to 400kHz Operation) up resistance while still meeting rise-time requirements. ■ READY Open Drain Output During insertion, the SDA and SCL lines are precharged ■ 1V Precharge on All SDA and SCL Lines to 1V to minimize bus disturbances. When driven high, ■ High Impedance SDA, SCL Pins for VCC = 0V ENABLE allows the LTC4303 to connect after a stop bit or ■ ENABLE Gates Connection from Input to Output bus idle occurs. Driving ENABLE low breaks the connection ■ MSOP 8-Pin and DFN (3mm × 3mm) Packages
U
between SDAIN and SDAOUT, SCLIN and SCLOUT. READY
APPLICATIO S
is an open drain output that indicates when the backplane and card sides are connected together. ■ Hot Board Insertion ■ Servers , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ Capacitance Buffer/Bus Extender Protected by U.S. Patents including 6356140, 6650174, 7032051. ■ RAID Systems
U TYPICAL APPLICATIO
5V 3.3V
Stuck Bus Resolved
0.01mF
with Automatic Clocking
10k 10k V 10k 10k CC LTC4303 SCLIN SCLOUT SDAOUT STUCK LOW > 30ms RECOVERS BACK_SCL CARD_SCL 5V/DIV DISCONNECT AT TIMEOUT SDAIN SDAOUT SDAIN BACK_SDA CARD_SDA 5V/DIV AUTOMATIC CLOCKING SCLOUT 5V/DIV 3.3V ENABLE READY GND 100k 4303 TA01 4303 TA01b 200ms/DIV BACKPLANE STAGGERED CARD CONNECTOR CONNECTOR 4303fb 1
U FEATURES DESCRIPTIO
■
Automatic Disconnect of SDA/SCL Lines when Bus
The LTC®4303 hot swappable 2-wire Bus Buffer allows I/O
is Stuck Low for ≥ 30ms
card insertion into a live backplane without corruption of ■
Recovers Stuck Busses with Automatic Clocking*
the data and clock busses. When a connection is made, ■
Bidirectional Buffer* for SDA and SCL Lines
the LTC4303 provides bidirectional buffering, keeping the
Increases Fanout
backplane and card capacitances isolated. If SDAOUT or ■
Prevents SDA and SCL Corruption During Live
SCLOUT is low for ≥ 30ms (typ), the LTC4303 automatically
Board Insertion and Removal from Backplane
breaks the data and clock bus connection. At this time the ■
Pin Compatible with LTC4300A-1
LTC4303 automatically generates up to 16 clock pulses on ■
±15kV Human Body Model ESD Protection
SCLOUT in an attempt to free the bus. A connection will ■ Isolates Input SDA and SCL Lines from Output be enabled automatically when the bus becomes free. ■ Compatible with I2CTM, I2C Fast-Mode and SMBus Rise-time accelerator circuitry allows the use of larger pull- Standards (Up to 400kHz Operation) up resistance while still meeting rise-time requirements. ■ READY Open Drain Output During insertion, the SDA and SCL lines are precharged ■ 1V Precharge on All SDA and SCL Lines to 1V to minimize bus disturbances. When driven high, ■ High Impedance SDA, SCL Pins for VCC = 0V ENABLE allows the LTC4303 to connect after a stop bit or ■ ENABLE Gates Connection from Input to Output bus idle occurs. Driving ENABLE low breaks the connection ■ MSOP 8-Pin and DFN (3mm × 3mm) Packages
U
between SDAIN and SDAOUT, SCLIN and SCLOUT. READY
APPLICATIO S
is an open drain output that indicates when the backplane and card sides are connected together. ■ Hot Board Insertion ■ Servers , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ Capacitance Buffer/Bus Extender Protected by U.S. Patents including 6356140, 6650174, 7032051. ■ RAID Systems
U TYPICAL APPLICATIO
5V 3.3V
Stuck Bus Resolved
0.01mF
with Automatic Clocking
10k 10k V 10k 10k CC LTC4303 SCLIN SCLOUT SDAOUT STUCK LOW > 30ms RECOVERS BACK_SCL CARD_SCL 5V/DIV DISCONNECT AT TIMEOUT SDAIN SDAOUT SDAIN BACK_SDA CARD_SDA 5V/DIV AUTOMATIC CLOCKING SCLOUT 5V/DIV 3.3V ENABLE READY GND 100k 4303 TA01 4303 TA01b 200ms/DIV BACKPLANE STAGGERED CARD CONNECTOR CONNECTOR 4303fb 1
