LTC4301LIMS8#TRPBF

1
LTC4301L
4301lfa
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
Hot Swappable 2-Wire
Bus Buffer with Low Voltage
Level Translation
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 V
CC
= 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 MSOP and DFN (3mm × 3mm) Packages
Hot Board Insertion
Servers
Capacitance Buffer/Bus Extender
Desktop Computers
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.
Input-Output Connection
OUTPUT
SIDE
20pF
INPUT
SIDE
55pF
4301 TA01b
1µs/DIV
0.5V/DIV
µP
SDA
SCL
V
CC
GND
SDAIN
SCLIN
CS
SDAOUT
SCLOUT
READY
LTC4301L
V
CC
GND
2k 10k2k 10k
0.01µF
SDA
SCL
1.2V 3.3V
4301l TA01a
, 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.
2
LTC4301L
4301lfa
V
CC
to GND ................................................. –0.3V to 7V
SDAIN, SCLIN, SDAOUT, SCLOUT, CS ........ –0.3V to 7V
READY ........................................................ –0.3V to 6V
Operating Temperature Range
LTC4301LC ............................................. 0°C to 70°C
LTC4301LI.......................................... – 40°C to 85°C
LTC4301LCDD
LTC4301LIDD
T
JMAX
= 125°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 9) IS GND
PCB CONNECTION OPTIONAL
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
DD PART MARKING
LBHS
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Storage Temperature Range
MSOP ............................................... 65°C to 150°C
DFN .................................................. 65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
(Note 1)
ORDER PART NUMBER
LTC4301LCMS8
LTC4301LIMS8
MS8 PART MARKING
LTBHQ
TOP VIEW
9
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
5
6
7
8
4
3
2
1CS
SCLOUT
SCLIN
GND
V
CC
SDAOUT
SDAIN
READY
T
JMAX
= 125°C, θ
JA
= 200°C/W
1
2
3
4
CS
SCLOUT
SCLIN
GND
8
7
6
5
V
CC
SDAOUT
SDAIN
READY
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
ORDER PART NUMBER
The indicates specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 2.7V to 5.5V, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply
V
CC
Positive Supply Voltage 2.7 5.5 V
I
CC
Supply Current V
CC
= 5.5V, V
SDAIN
= V
SCLIN
= 0V 4.5 6.2 mA
V
CC
= 5.5V, CS = 5.5V 300 µA
Start-Up Circuitry
V
PRE
Precharge Voltage SDAOUT, SCLOUT Floating 0.85 1.05 1.25 V
t
IDLE
Bus Idle Time 60 95 175 µs
RDY
VOL
READY Output Low Voltage I
PULLUP
= 3mA 0.4 V
V
THRCS
Connection Sense Threshold 0.8 1.4 2 V
I
CS
CS Input Current CS from 0V to V
CC
±0.1 ±1 µA
3
LTC4301L
4301lfa
The indicates specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 2.7V to 5.5V, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The connection circuitry always regulates its output to a higher
voltage than its input. The magnitude of this offset voltage as a function of
the pull-up resistor and V
CC
voltage is shown in the Typical Performance
Characteristics section.
Note 3: Determined by design, not tested in production.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
THR
SDAIN, SCLIN Logic Input Threshold Voltage Rising Edge 0.45 0.6 0.75 V
SDAOUT, SCLOUT Logic Input Threshold Voltage Rising Edge 1.55 1.8 2.0 V
V
HYS
SDAIN, SCLIN Logic Input Threshold Hysteresis (Note 3) 85 mV
SDAOUT, SCLOUT Logic Input Threshold Hysteresis (Note 3) 50 mV
t
PLH
CS Delay On-Off 10 ns
READY Delay Off-On 10 ns
t
PHL
CS Delay Off-On 95 µs
READY Delay On-Off 10 ns
I
OFF
Ready Off Leakage Current ±0.1 µA
Input-Output Connection
V
OS
Input-Output Offset Voltage 10k to V
CC
on SDA, SCL, V
CC
= 3.3V, 0 100 175 mV
SDA or SCL = 0.2V (Note 2)
C
IN
Digital Input Capacitance SDAIN, SDAOUT, (Note 3) 10 pF
SCLIN, SCLOUT
I
LEAK
Input Leakage Current SDA, SCL Pins ±5 µA
V
OL
Output Low Voltage, Input = 0V SDA, SCL Pins, 0 0.4 V
I
SINK
= 3mA, V
CC
= 2.7V
SDA, SCL Pins, 0 0.2 V
I
SINK
= 1mA, V
CC
= 2.7V
Timing Characteristics
f
I2C,MAX
I
2
C Maximum Operating Frequency (Note 3) 400 600 kHz
t
BUF
Bus Free Time Between Stop and Start (Note 3) 1.3 µs
Condition
t
HD,STA
Hold Time After (Repeated) Start Condition (Note 3) 100 ns
t
SU,STA
Repeated Start Condition Set-Up Time (Note 3) 0 ns
t
SU,STO
Stop Condition Set-Up Time (Note 3) 0 ns
t
HD,DATI
Data Hold Time Input (Note 3) 0 ns
t
SU,DAT
Data Set-Up Time (Note 3) 100 ns

LTC4301LIMS8#TRPBF

Mfr. #:
Manufacturer:
Analog Devices Inc.
Description:
Interface - Signal Buffers, Repeaters Supply Independent I2C Bus Buffer
Lifecycle:
New from this manufacturer.
Delivery:
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