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LTC4301IMS8#PBF

P1-P3P4-P6P7-P9P10-P12
1
LTC4301
4301fb
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
Supply Independent Hot
Swappable 2-Wire Bus Buffer
■
Allows Bus Pull-Up Voltages Above or Below V
CC
■
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
■
1V Precharge On All SDA and SCL Lines
■
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
■
CompactPCI
TM
and ATCA Systems
The LTC
®
4301 supply independent, hot swappable, 2-wire
bus buffer allows I/O card insertion into a live backplane
without corruption of the data and clock busses. In addi-
tion, the LTC4301 allows the V
CC
, SDAIN and SCLIN pull-
up voltage and the SDAOUT and SCLOUT pull-up voltage
to be independent from each other. Control circuitry
prevents the backplane from being connected to the card
until a stop bit or a bus idle is present. When the connec-
tion is made, the LTC4301 provides bidirectional buffer-
ing, keeping the backplane and card capacitances isolated.
During insertion, the SDA and SCL lines are precharged to
1V to minimize bus disturbances. 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 be-
tween SCLIN and SCLOUT and between SDAIN and
SDAOUT. The READY output pin indicates that the back-
plane and card sides are connected together.
The LTC4301 is offered in 8-pin DFN (3mm × 3mm) and
MSOP packages.
10k10k
5V
BACK_SCL
BACKPLANE
CONNECTOR
CARD
BACK_SDA
3.3V
10k
5V
CS
CARD_SCL
CARD_SDA
SCLOUTSCLIN
SDAOUTSDAIN
GND
V
CC
LTC4301
READY
0.01µF
4301 TA01
10k 10k
STAGGERED CONNECTOR
Input-Output Connection
4301 TA01b
OUTPUT
SIDE
20pF
INPUT
SIDE
55pF
1µs/DIV
1V/DIV
, 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
LTC4301
4301fb
ORDER PART
NUMBER
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
LTC4301C ............................................... 0°C to 70°C
LTC4301I............................................ – 40°C to 85°C
LTC4301CDD
LTC4301IDD
T
JMAX
= 125°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 9)
PCB CONNECTION OPTIONAL
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
DD PART
MARKING*
LBBY
*The temperature grade is identified by a label on the shipping container. 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
LTC4301CMS8
LTC4301IMS8
MS8 PART
MARKING*
LTBBW
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
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 SDA, SCL 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
V
THR
SDA, SCL Logic Input Threshold Voltage Rising Edge 1.55 1.8 2.0 V
V
HYS
SDA, SCL Logic Input Threshold Voltage (Note 3) 50 mV
Hysteresis
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
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/
3
LTC4301
4301fb
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
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, I
SINK
= 3mA, V
CC
= 2.7V ● 0 0.4 V
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
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.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
I
CC
vs Temperature
Input – Output High to Low
Propagation Delay vs Temperature
Connection Circuitry V
OUT
– V
IN
–50 –25 0 25 50 75 100
TEMPERATURE (°C)
TIME (ns)
4301 G02
100
80
60
40
20
0
V
CC
= 2.7V
V
CC
= 3.3V
V
CC
= 5.5V
C
IN
= C
OUT
= 100pF
R
PULLUPIN
= R
PULLUPOUT
= 10k
R
PULLUP
(Ω)
0
10,000 20,000 30,000 40,000
V
OUT
– V
IN
(mV)
4301 G03
300
250
200
150
100
50
0
V
CC
= 3.3V
V
CC
= 5V
T
A
= 25°C
V
IN
= 0V
TEMPERATURE (°C)
–80
I
CC
(mA)
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
4.1
4.0
3.9
–40
0
20 100
4301 G01
–60 –20
40
60
80
V
CC
= 5.5V
V
CC
= 3.3V
V
CC
= 2.7V
P1-P3P4-P6P7-P9P10-P12

LTC4301IMS8#PBF

Mfr. #:
Buy LTC4301IMS8#PBF
Manufacturer:
Analog Devices Inc.
Description:
Interface - Signal Buffers, Repeaters Supply Independent I2C Bus Buffer
Lifecycle:
New from this manufacturer.
Delivery:
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