IC BUS BUFFER I2C 8-MSOP

 

LTC4303CMS8#PBF

Manufacturer Part NumberLTC4303CMS8#PBF
DescriptionIC BUS BUFFER I2C 8-MSOP
ManufacturerLinear Technology
TypeHot-Swap Switch
LTC4303CMS8#PBF datasheets

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Specifications of LTC4303CMS8#PBF

ApplicationsGeneral Purpose, Buffer/Bus ExtenderInternal Switch(s)Yes
Voltage - Supply2.7 V ~ 5.5 VOperating Temperature0°C ~ 70°C
Mounting TypeSurface MountPackage / Case8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
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FEATURES
■
Automatic Disconnect of SDA/SCL Lines when Bus
is Stuck Low for ≥ 30ms
Recovers Stuck Busses with Automatic Clocking*
■
■
Bidirectional Buffer* for SDA and SCL Lines
Increases Fanout
Prevents SDA and SCL Corruption During Live
■
Board Insertion and Removal from Backplane
Pin Compatible with LTC4300A-1
■
■
±15kV Human Body Model ESD Protection
■
Isolates Input SDA and SCL Lines from Output
2
2
Compatible with I
C
TM
, I
C Fast-Mode and SMBus
■
Standards (Up to 400kHz Operation)
■
READY Open Drain Output
1V Precharge on All SDA and SCL Lines
■
■
High Impedance SDA, SCL Pins for V
ENABLE Gates Connection from Input to Output
■
MSOP 8-Pin and DFN (3mm × 3mm) Packages
■
U
APPLICATIO S
■
Hot Board Insertion
■
Servers
Capacitance Buffer/Bus Extender
■
■
RAID Systems
U
TYPICAL APPLICATIO
5V
3.3V
10k
10k
SCLIN
BACK_SCL
SDAIN
BACK_SDA
3.3V
ENABLE
100k
BACKPLANE
STAGGERED
CONNECTOR
CONNECTOR
Hot Swappable 2-Wire
Bus Buffer with Stuck
DESCRIPTIO
®
The LTC
4303 hot swappable 2-wire Bus Buffer allows I/O
card insertion into a live backplane without corruption of
the data and clock busses. When a connection is made,
the LTC4303 provides bidirectional buffering, keeping the
backplane and card capacitances isolated. If SDAOUT or
SCLOUT is low for ≥ 30ms (typ), the LTC4303 automatically
breaks the data and clock bus connection. At this time the
LTC4303 automatically generates up to 16 clock pulses on
SCLOUT in an attempt to free the bus. A connection will
be enabled automatically when the bus becomes free.
Rise-time accelerator circuitry allows the use of larger pull-
up resistance while still meeting rise-time requirements.
During insertion, the SDA and SCL lines are precharged
to 1V to minimize bus disturbances. When driven high,
= 0V
CC
ENABLE allows the LTC4303 to connect after a stop bit or
bus idle occurs. Driving ENABLE low breaks the connection
between SDAIN and SDAOUT, SCLIN and SCLOUT. READY
is an open drain output that indicates when the backplane
and card sides are connected together.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6356140, 6650174, 7032051.
0.01 F
10k
10k
V
CC
LTC4303
SDAOUT
SCLOUT
5V/DIV
CARD_SCL
SDAIN
SDAOUT
5V/DIV
CARD_SDA
SCLOUT
5V/DIV
READY
GND
4303
TA01
CARD
LTC4303
Bus Recovery
U
Stuck Bus Resolved
with Automatic Clocking
RECOVERS
STUCK LOW > 30ms
DISCONNECT AT TIMEOUT
AUTOMATIC CLOCKING
4303 TA01b
200 s/DIV
4303fb
1

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LTC4303CMS8#PBF Summary of contents

  • Page 1

    ... SDAIN and SDAOUT, SCLIN and SCLOUT. READY is an open drain output that indicates when the backplane and card sides are connected together. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 6356140, 6650174, 7032051. ...

  • Page 2

    LTC4303 ABSOLUTE AXI U RATI GND .................................................. –0. SDAIN, SCLIN, SDAOUT, SCLOUT, READY, ENABLE ........................................... –0. Operating Temperature LTC4303C ................................................ 0°C to 70°C LTC4303I .............................................–40°C to 85°C U PACKAGE/ORDER ...

  • Page 3

    ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER V SDA, SCL, Logic Input Threshold Voltage (Note 6) HYS Hysteresis t Delay ENABLE High-Low to Disconnect PHL_ENABLE t Delay READY High-Low after Disconnect PHL_READY t Delay ENABLE ...

  • Page 4

    LTC4303 W U TYPICAL PERFOR Temperature CC 6 5.5V CC 6.0 5.8 5.6 5 2.7V CC 5.2 5.0 – 100 –25 TEMPERATURE (°C) 4303 G01 Connection Circuitry V 250 ...

  • Page 5

    CTIO S ENABLE (Pin 1): Connection Enable. This is a digital threshold input pin. For normal operation ENABLE is high. Driving ENABLE below 0.8V isolates SDAIN from SDAOUT, SCLIN from SCLOUT, asserts READY low and ...

  • Page 6

    LTC4303 U OPERATIO Start-Up When the LTC4303 fi rst receives power on its V either during power up or live insertion, it starts in an under voltage lockout (UVLO) state, ignoring any activity on the SDA or SCL pins until ...

  • Page 7

    U OPERATIO OUTPUT SIDE 50pF 0.5V/DIV 200ns/DIV Figure 1. Input-Output Connection t the two sides. This effect is displayed in Figure 1 for 3.3V and a 10k pull-up resistor on each side (50pF CC on one side ...

  • Page 8

    ... LTC4303 from becoming activated until the transients associated with live insertion have settled. Connect the capacitor between ENABLE and GND, and the resistor from V Hot Swap is a trademark of Linear Technology Corporation. and GND will be long CC TM confi gu- ...

  • Page 9

    U U APPLICATIO S I FOR ATIO BACKPLANE CONNECTOR BACKPLANE 10k 10k BD_SEL SDA SCL Figure 3. Inserting Multiple I/O Cards into a Live Backplane Using the LTC4303 in a CompactPCI System W U STAGGERED CONNECTOR ...

  • Page 10

    LTC4303 U U APPLICATIO S I FOR ATIO BACKPLANE CONNECTOR BACKPLANE 10k 10k SDA SCL Figure 4. Inserting Multiple I/O Cards into a Live Backplane Using the LTC4303 in a PCI System SHELF MANAGER R1 R2 ...

  • Page 11

    ... LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

  • Page 12

    ... Hot Swappable 2-Wire Bus Buffer with Low Voltage Level Translation LTC4302-1/LTC4302-2 Addressable 2-Wire Bus Buffer LTC4304 Hot Swappable 2-Wire Bus Buffer with Stuck Bus Recovery ThinSOT is a trademark of Linear Technology Corporation. Linear Technology Corporation 12 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 3 ...

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