Datasheet LTC4301 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | Supply Independent Hot Swappable 2-Wire Bus Buffer |
| Seiten / Seite | 12 / 1 — FEATURES. DESCRIPTIO. Allows Bus Pull-Up Voltages Above or Below VCC. … |
| Dateiformat / Größe | PDF / 229 Kb |
| Dokumentensprache | Englisch |
FEATURES. DESCRIPTIO. Allows Bus Pull-Up Voltages Above or Below VCC. Bidirectional Buffer* for SDA and SCL Lines
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LTC4301 Supply Independent Hot Swappable 2-Wire Bus Buffer
U FEATURES DESCRIPTIO
■
Allows Bus Pull-Up Voltages Above or Below VCC
The LTC®4301 supply independent, hot swappable, 2-wire ■
Bidirectional Buffer* for SDA and SCL Lines
bus buffer allows I/O card insertion into a live backplane
Increases Fanout
without corruption of the data and clock busses. In addi- ■
Prevents SDA and SCL Corruption During Live Board
tion, the LTC4301 allows the VCC, SDAIN and SCLIN pull-
Insertion and Removal from Backplane
up voltage and the SDAOUT and SCLOUT pull-up voltage ■
Isolates Input SDA and SCL Line from Output
to be independent from each other. Control circuitry ■
10kV Human Body Model ESD Protection
prevents the backplane from being connected to the card ■ 1V Precharge On All SDA and SCL Lines until a stop bit or a bus idle is present. When the connec- ■ Supports Clock Stretching, Arbitration and tion is made, the LTC4301 provides bidirectional buffer- Synchronization ing, keeping the backplane and card capacitances isolated. ■ High Impedance SDA, SCL Pins for VCC = 0V During insertion, the SDA and SCL lines are precharged to ■ CS Gates Connection from Input to Output 1V to minimize bus disturbances. When driven low, the CS ■ Compatible with I2CTM, I2C Fast Mode and SMBus input pin allows the part to connect after a stop bit or bus Standards (Up to 400kHz Operation) idle occurs. Driving CS high breaks the connection be- ■ Small 8-Pin MSOP and DFN (3mm × 3mm) Packages tween SCLIN and SCLOUT and between SDAIN and
U APPLICATIO S
SDAOUT. The READY output pin indicates that the back- plane and card sides are connected together. ■ Hot Board Insertion The LTC4301 is offered in 8-pin DFN (3mm × 3mm) and ■ Servers MSOP packages. ■ Capacitance Buffer/Bus Extender ■ Desktop Computers , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ CompactPCI
TM
and ATCA Systems Protected by U.S. Patents including 7032051.
U TYPICAL APPLICATIO Input-Output Connection
3.3V 5V 0.01µF 10k 10k V 10k 10k CC LTC4301 SCLIN SCLOUT BACK_SCL CARD_SCL OUTPUT INPUT SIDE SIDE 20pF 55pF SDAIN SDAOUT BACK_SDA CARD_SDA AGGERED CONNECTOR 5V 1V/DIV ST 10k CS READY GND 4301 TA01b 1µs/DIV 4301 TA01 BACKPLANE CARD CONNECTOR 4301fb 1
U FEATURES DESCRIPTIO
■
Allows Bus Pull-Up Voltages Above or Below VCC
The LTC®4301 supply independent, hot swappable, 2-wire ■
Bidirectional Buffer* for SDA and SCL Lines
bus buffer allows I/O card insertion into a live backplane
Increases Fanout
without corruption of the data and clock busses. In addi- ■
Prevents SDA and SCL Corruption During Live Board
tion, the LTC4301 allows the VCC, SDAIN and SCLIN pull-
Insertion and Removal from Backplane
up voltage and the SDAOUT and SCLOUT pull-up voltage ■
Isolates Input SDA and SCL Line from Output
to be independent from each other. Control circuitry ■
10kV Human Body Model ESD Protection
prevents the backplane from being connected to the card ■ 1V Precharge On All SDA and SCL Lines until a stop bit or a bus idle is present. When the connec- ■ Supports Clock Stretching, Arbitration and tion is made, the LTC4301 provides bidirectional buffer- Synchronization ing, keeping the backplane and card capacitances isolated. ■ High Impedance SDA, SCL Pins for VCC = 0V During insertion, the SDA and SCL lines are precharged to ■ CS Gates Connection from Input to Output 1V to minimize bus disturbances. When driven low, the CS ■ Compatible with I2CTM, I2C Fast Mode and SMBus input pin allows the part to connect after a stop bit or bus Standards (Up to 400kHz Operation) idle occurs. Driving CS high breaks the connection be- ■ Small 8-Pin MSOP and DFN (3mm × 3mm) Packages tween SCLIN and SCLOUT and between SDAIN and
U APPLICATIO S
SDAOUT. The READY output pin indicates that the back- plane and card sides are connected together. ■ Hot Board Insertion The LTC4301 is offered in 8-pin DFN (3mm × 3mm) and ■ Servers MSOP packages. ■ Capacitance Buffer/Bus Extender ■ Desktop Computers , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ CompactPCI
TM
and ATCA Systems Protected by U.S. Patents including 7032051.
U TYPICAL APPLICATIO Input-Output Connection
3.3V 5V 0.01µF 10k 10k V 10k 10k CC LTC4301 SCLIN SCLOUT BACK_SCL CARD_SCL OUTPUT INPUT SIDE SIDE 20pF 55pF SDAIN SDAOUT BACK_SDA CARD_SDA AGGERED CONNECTOR 5V 1V/DIV ST 10k CS READY GND 4301 TA01b 1µs/DIV 4301 TA01 BACKPLANE CARD CONNECTOR 4301fb 1