LTC4301L Datasheet, PDF (1/12 Pages) Linear Technology – Hot Swappable 2-Wire Bus Buffer with Low Voltage Level Translation

FEATURES
■ _{Level Translates 1V Signals to Standard 3.3V and}
5V Logic Rails
■ _{Allows Bus Pull-Up Voltages as Low as 1V on}
SDAIN and SCLIN
■ _{Bidirectional Buffer* for SDA and SCL Lines}
Increases Fanout
■ _{Prevents SDA and SCL Corruption During Live Board}
Insertion and Removal from Backplane
■ _{Isolates Input SDA and SCL Line from Output}
■ _{10kV Human Body Model ESD Protection}
■ _{Supports Clock Stretching, Arbitration and}
Synchronization
■ _{High Impedance SDA, SCL Pins for VCC = 0V}
■ _{CS Gates Connection from Input to Output}
■ _{Compatible with I}²_C^TM_{, I}²_{C Fast Mode and SMBus}
Standards (Up to 400kHz Operation)
■ _{Small 8-Pin MSOUP and DFN (3mm × 3mm) Packages}
APPLICATIO S
■ _{Hot Board Insertion}
■ _Servers
■ _{Capacitance Buffer/Bus Extender}
■ _{Desktop Computers}
LTC4301L
Hot Swappable 2-Wire
Bus Buffer with Low Voltage
Level Translation
DESCRIPTIO
The LTC^®4301L hot swappable, 2-wire bus buffer allows
I/O card insertion into a live backplane without corruption
of the data and clock busses. In addition, the LTC4301L
SDAIN and SCLIN pins are compatible with systems with
pull-up voltages as low as 1V. Control circuitry prevents
the backplane from being connected to the card until a
stop bit or a bus idle is present. When the connection is
made, the LTC4301L provides bidirectional buffering,
keeping the backplane and card capacitances isolated.
When driven low, the CS input pin allows the part to
connect after a stop bit or bus idle occurs. Driving CS high
breaks the connection between SCLIN and SCLOUT and
between SDAIN and SDAOUT. A logic high on READY
indicates that the backplane and card sides are connected
together.
The LTC4301L is offered in 8-pin DFN (3mm × 3mm) and
MSOP packages.
, 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 7032051.
TYPICAL APPLICATIO
1.2V
V_CC
SDA
µP
SCL
GND
3.3V
0.01µF
2k 2k
V_CC
SDAIN SDAOUT
LTC4301L
SCLIN SCLOUT
CS
READY
GND
10k 10k
SDA
SCL
4301l TA01a
Input-Output Connection
OUTPUT
SIDE
20pF
0.5V/DIV
INPUT
SIDE
55pF
1µs/DIV
4301 TA01b
4301lfa
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