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LTC4300A-1 Dataheets PDF



Part Number LTC4300A-1
Manufacturers Linear Technology
Logo Linear Technology
Description Hot Swappable 2-Wire Bus Buffers
Datasheet LTC4300A-1 DatasheetLTC4300A-1 Datasheet (PDF)

FEATURES n Bidirectional Buffer for SDA and SCL Lines Increases Fanout n Prevents SDA and SCL Corruption During Live Board Insertion and Removal from Backplane n Isolates Input SDA and SCL Lines from Output n Compatible with I2C, I2C Fast Mode and SMBus Standards (Up to 400kHz Operation) n Low ICC Chip Disable: <1μA (LTC4300A-1) n READY Open Drain Output (LTC4300A-1) n 1V Precharge on all SDA and SCL Lines n Supports Clock Stretching, Arbitration and Synchronization n 5V to 3.3V Level Translatio.

  LTC4300A-1   LTC4300A-1


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FEATURES n Bidirectional Buffer for SDA and SCL Lines Increases Fanout n Prevents SDA and SCL Corruption During Live Board Insertion and Removal from Backplane n Isolates Input SDA and SCL Lines from Output n Compatible with I2C, I2C Fast Mode and SMBus Standards (Up to 400kHz Operation) n Low ICC Chip Disable: <1μA (LTC4300A-1) n READY Open Drain Output (LTC4300A-1) n 1V Precharge on all SDA and SCL Lines n Supports Clock Stretching, Arbitration and Synchronization n 5V to 3.3V Level Translation (LTC4300A-2) n High Impedance SDA, SCL Pins for VCC = 0V n Small MSOP 8-Pin Package APPLICATIONS n Hot Board Insertion n Servers n Capacitance Buffer/Bus Extender n Desktop Computer L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. *Protected by U.S. Patents, including 6650174. LTC4300A-1/LTC4300A-2 Hot Swappable 2-Wire Bus Buffers DESCRIPTION The LTC®4300A series hot swappable 2-wire bus buffers allow I/O card insertion into a live backplane without corruption of the data and clock busses. When the connection is made, the LTC4300A-1/LTC4300A-2 provide bidirectional buffering, keeping the backplane and card capacitances isolated. Rise-time accelerator circuitry* allows the use of weaker DC pull-up currents while still meeting rise-time requirements. During insertion, the SDA and SCL lines are precharged to 1V to minimize bus disturbances. The LTC4300A-1 incorporates a CMOS threshold digital ENABLE input pin, which forces the part into a low current mode when driven to ground and sets normal operation when driven to VCC. It also includes an open drain READY output pin, which indicates that the backplane and card sides are connected together. The LTC4300A-2 replaces the ENABLE pin with a dedicated supply voltage pin, VCC2, for the card side, providing level shifting between 3.3V and 5V systems. Both the backplane and card may be powered with supply voltages ranging from 2.7V to 5.5V, with no constraints on which supply voltage is higher. The LTC4300A-2 also replaces the READY pin with a digital CMOS input pin, ACC, which enables and disables the rise-time accelerator currents. The LTC4300A is available in a small 8-pin MSOP package. TYPICAL APPLICATION VCC 3.3V R1 R2 10k 10k C1 0.01μF SCLIN R3 R4 10k 10k SCLOUT Input–Output Connection tPLH OUTPUT SIDE 50pF INPUT SIDE 150pF SDAIN LTC4300A-1 ENABLE GND READY 4300a12 TA01 SDAOUT 4300a12 TA02 4300a12fa 1 LTC4300A-1/LTC4300A-2 ABSOLUTE MAXIMUM RATINGS (Note 1) VCC to GND .................................................... –0.3 to 7V VCC2 to GND (LTC4300A-2)............................ –0.3 to 7V SDAIN, SCLIN, SDAOUT, SCLOUT.................. –0.3 to 7V READY, ENABLE (LTC4300A-1)...................... –0.3 to 7V ACC (LTC4300A-2)......................................... –0.3 to 7V Operating Temperature Range LTC4300A-1C/LTC4300A-2C.................... 0°C to 70°C LTC4300A-1I/LTC4300A-2I ..................–40°C to 85°C Storage Temperature Range .................. –65°C to 125°C Lead Temperature (Soldering, 10 sec)................... 300°C PIN CONFIGURATION TOP VIEW ENABLE/VCC2* 1 SCLOUT 2 SCLIN 3 GND 4 8 VCC 7 SDAOUT 6 SDAIN 5 READY/ACC* MS8 PACKAGE 8-LEAD PLASTIC MSOP *LTC4300A-2 TJMAX = 125°C, θJA = 200°C/W ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION LTC4300A-1CMS8#PBF LTC4300A-1CMS8#TRPBF LTABF 8-Lead Plastic MSOP LTC4300A-1IMS8#PBF LTC4300A-1IMS8#TRPBF LTABG 8-Lead Plastic MSOP LTC4300A-2CMS8#PBF LTC4300A-2CMS8#TRPBF LTACF 8-Lead Plastic MSOP LTC4300A-2IMS8#PBF LTC4300A-2IMS8#TRPBF LTACG 8-Lead Plastic MSOP Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on nonstandard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ TEMPERATURE RANGE 0°C to 70°C –40°C to 85°C 0°C to 70°C –40°C to 85°C ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 2.7V to 5.5V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Power Supply VCC Positive Supply Voltage l 2.7 5.5 V ICC Supply Current VCC = 5.5V, VSDAIN = VSCLIN = 0V, LTC4300A-1 l 5.1 7 mA ISD Supply Current in Shutdown Mode VENABLE = 0V, LTC4300A-1 0.1 μA VCC2 Card Side Supply Voltage LTC4300A-2 l 2.7 5.5 V IVCC1 VCC Supply Current VSDAIN = VSCLIN = 0V, VCC1 = VCC2 = 5.5V, LTC4300A-2 3 4.1 mA IVCC2 VCC2 Supply Current VSDAOUT = VSCLOUT = 0V, VCC1 = VCC2 = 5.5V, LTC4300A-2 2.1 2.9 mA Start-Up Circuitry VPRE Precharge Voltage tIDLE Bus Idle Time VEN .


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