LTC4301L
Hot Swappable 2-Wire
Bus Buffer with Low Voltage
Level Translation
FEATURES DESCRIPTIO
Level Translates 1V Signals to Standard 3.3V and The LTC 4301L hot swappable, 2-wire bus buffer allows
5V Logic Rails I/O card insertion into a live backplane without corruption
Allows Bus Pull-Up Voltages as Low as 1V on of the data and clock busses. In addition, the LTC4301L
SDAIN and SCLIN SDAIN and SCLIN pins are compatible with systems with
Bidirectional Buffer* for SDA and SCL Lines pull-up voltages as low as 1V. Control circuitry prevents
Increases Fanout the backplane from being connected to the card until a
Prevents SDA and SCL Corruption During Live Board stop bit or a bus idle is present. When the connection is
Insertion and Removal from Backplane made, the LTC4301L provides bidirectional buffering,
Isolates Input SDA and SCL Line from Output keeping the backplane and card capacitances isolated.
10kV Human Body Model ESD Protection
When driven low, the CS input pin allows the part to
Supports Clock Stretching, Arbitration and
connect after a stop bit or bus idle occurs. Driving CS high
Synchronization
breaks the connection between SCLIN and SCLOUT and
High Impedance SDA, SCL Pins for V = 0V
CC
between SDAIN and SDAOUT. A logic high on READY
CS Gates Connection from Input to Output
indicates that the backplane and card sides are connected
TM
2 2
Compatible with I C , I C Fast Mode and SMBus
together.
Standards (Up to 400kHz Operation)
The LTC4301L is offered in 8-pin DFN (3mm 3mm) and
Small 8-Pin MSOP and DFN (3mm 3mm) Packages
U MSOP packages.
APPLICATIO S
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Hot Board Insertion
Protected by U.S. Patents including 7032051.
Servers
Capacitance Buffer/Bus Extender
Desktop Computers
TYPICAL APPLICATIO
Input-Output Connection
1.2V 3.3V
0.01F
2k 2k 10k 10k
V V
CC CC
SDA SDAIN SDAOUT SDA
OUTPUT INPUT
SIDE
SIDE
P
LTC4301L
20pF 55pF
SCL SCLIN SCLOUT SCL
0.5V/DIV
CS READY
GND GND
4301l TA01a 4301 TA01b
1s/DIV
4301lfa
1
U
ULTC4301L
ABSOLUTE MAXIMUM RATINGS (Note 1)
V to GND ................................................. 0.3V to 7V
Storage Temperature Range
CC
SDAIN, SCLIN, SDAOUT, SCLOUT, CS ........ 0.3V to 7V
MSOP ............................................... 65C to 150C
READY ........................................................ 0.3V to 6V
DFN .................................................. 65C to 125C
Operating Temperature Range
Lead Temperature (Soldering, 10 sec).................. 300C
LTC4301LC ............................................. 0C to 70C
LTC4301LI.......................................... 40C to 85C
PACKAGE/ORDER INFORMATION
TOP VIEW
CS 1 8 V
CC TOP VIEW
SCLOUT 2 7 SDAOUT
CS 1 8 V
CC
9
SCLOUT 2 7 SDAOUT
SCLIN SDAIN
3 6
SCLIN 3 6 SDAIN
GND 4 5 READY
GND 4 5 READY
MS8 PACKAGE
DD PACKAGE 8-LEAD PLASTIC MSOP
8-LEAD (3mm 3mm) PLASTIC DFN
T = 125C, = 200C/W
JMAX JA
T = 125C, = 43C/W
JMAX JA
EXPOSED PAD (PIN 9) IS GND
PCB CONNECTION OPTIONAL
ORDER PART NUMBER DD PART MARKING ORDER PART NUMBER MS8 PART MARKING
LTC4301LCDD LBHS LTC4301LCMS8 LTBHQ
LTC4301LIDD LTC4301LIMS8
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: