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Linear Technology Electronic Components Datasheet

LTC4302IMS-1 Datasheet

Addressable 2-Wire Bus Buffers

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LTC4302-1/LTC4302-2
Addressable
2-Wire Bus Buffers
FEATURES
DESCRIPTIO
s Bidirectional Buffer for SDA and SCL Lines
Increases Fanout
s Connect SDA and SCL Lines with 2-Wire Bus
Commands
s Prevents SDA and SCL Corruption During Live Board
www.DataShseetIC4nUos.mceorpmtiaotnibalendwiRthemI2oCvTMalSftraonmdaBradcMkpoldaen,eI2C Fast
Mode and SMBus Standards
s Rise Time Accelerators on SDA, SCL Lines
s 1V Precharge on SDA and SCL Lines
s 32 Unique Addresses from a Single ADDRESS Pin
s Two General Purpose Inputs-Outputs (LTC4302-1)
s Translates Between 5V and 3.3V Systems
(LTC4302-2)
s Small 10-Pin MSOP Package
U
APPLICATIO S
s Live Board Insertion
s 5V/3.3V Level Translator
s Servers
s Capacitance Buffer/Bus Extender
s Nested Addressing
, LTC and LT are registered trademarks of Linear Technology Corporation.
I2C is a trademark of Philips Electronics N.V.
*U.S. Patent No. 6,650,174
The LTC®4302-1/LTC4302-2 addressable I2C bus and
SMBus compatible bus buffers allow a peripheral board
to be inserted and removed from a live backplane without
corruption of the bus. The LTC4302-1/LTC4302-2 main-
tain electrical isolation between the backplane and periph-
eral board until their VCC supply is valid and a master
device on the backplane side addresses the LTC4302-1/
LTC4302-2 and commands them to connect. The
LTC4302-1/LTC4302-2’s ADDRESS pin provides 32 pos-
sible addresses set by an external resistive divider be-
tween VCC and GND. The LTC4302-1/LTC4302-2 work
with supply voltages ranging from 2.7V to 5.5V. The SDA
and SCL inputs and outputs do not load the bus lines when
VCC is low.
Rise time accelerator circuitry* allows for heavier capaci-
tive bus loading while still meeting system timing require-
ments. During insertion, the SDA and SCL lines are
precharged to 1V to minimize bus disturbances. Two
general purpose input/output pins (GPIOs) on the
LTC4302-1 can be configured as inputs, open-drain out-
puts or push-pull outputs. The LTC4302-2 option replaces
one GPIO pin with a second supply voltage pin VCC2,
providing level shifting between systems with different
supply voltages. The LTC4302-1/LTC4302-2 are available
in a 10-pin MSOP package.
TYPICAL APPLICATIO
2.7V
to
5.5V
R3 R4 R1
R5
10k 10k 187010k
VCC
C1
0.01µF R6 R7 R8
R9
10k 10k 1k
1k
SDA
LTC4302-1
CARD SDA
SCL SDAIN
SCLIN
SDAOUT
SCLOUT CARD SCL
R2
2000
CONN
ADDRESS GPIO2
GPIO1
GND
LED
LED
4203 TA01a
Input-Output Connection tPLH
OUTPUT
SIDE
50pF
INPUT
SIDE
150pF
0.1µs/DIV
4032 F10
sn430212 430212fs
1


Linear Technology Electronic Components Datasheet

LTC4302IMS-1 Datasheet

Addressable 2-Wire Bus Buffers

No Preview Available !

LTC4302-1/LTC4302-2
ABSOLUTE AXI U RATI GS (Note 1)
VCC to GND ................................................. –0.3V to 7V
SDAIN, SCLIN, SDAOUT, SCLOUT,
GPIO1, CONN, GPIO2 (LTC4302-1),
VCC2 (LTC4302-2) ........................................ –0.3V to 7V
ADDRESS ....................................... –0.3V to VCC + 0.3V
Operating Temperature Range
LTC4302C-1/LTC4302C-2 ...................... 0°C to 70°C
LTC4302I-1/LTC4302I-2 .................... – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
www.DataSheet4U.com
ORDER PART
SDAIN 1
SCLIN 2
CONN 3
ADDRESS 4
GND 5
TOP VIEW
10 SDAOUT
9 SCLOUT
8 VCC
7 GPIO2
6 GPIO1
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 130°C/W
NUMBER
LTC4302CMS-1
LTC4302IMS-1
MS PART MARKING
LTYF
LTYG
Consult LTC Marketing for parts specified with wider operating temperature ranges.
SDAIN 1
SCLIN 2
CONN 3
ADDRESS 4
GND 5
TOP VIEW
10 SDAOUT
9 SCLOUT
8 VCC
7 VCC2
6 GPIO1
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 130°C/W
ORDER PART
NUMBER
LTC4302CMS-2
LTC4302IMS-2
MS PART MARKING
LTABY
LTABZ
ELECTRICAL CHARACTERISTICS
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VCC = 2.7V to 5.5V (LTC4302-1), VCC = VCC2 = 2.7V to 5.5V (LTC4302-2) unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Power Supply/Start-Up
VCC
Positive Supply Voltage
VCC2
Card Side Supply Voltage
ICC
Supply Current
IVCC
VCC Supply Current
LTC4302-1
q 2.7
5.5
V
LTC4302-2
q 2.7
5.5
V
VSDAIN = 0V, VCC = 5.5V (Note 2) LTC4302-1
q
VSDAIN = 0V, VCC = VCC2 = 5.5V
q
(Note 2) LTC4302-2
5.9
8
mA
3.4
5
mA
IVCC2
VCC2 Supply Current
VSDAIN = 0V, VCC = VCC2 = 5.5V
(Note 2) LTC4302-2
q
2.3
4
mA
VUVLOU
VUVLOL
VUVLO2U
VUVLO2L
VPRE
VTHCONN
tPHL
tPLH
UVLO Upper Threshold
UVLO Lower Threshold
VCC2 UVLO Upper Threshold
VCC2 UVLO Lower Threshold
Precharge Voltage
CONN Threshold Voltage
CONN Delay, On-Off
CONN Delay, Off-On
VCC Rising
VCC Falling
LTC4302-2
LTC4302-2
SDA, SCL Floating
q
2.5
2.7
V
2.35
V
q
2.5
2.7
V
2.35
V
q 0.8
1
1.2
V
q 0.8
1.5
2.2
V
60
ns
20
ns
2
sn430212 430212fs


Part Number LTC4302IMS-1
Description Addressable 2-Wire Bus Buffers
Maker Linear
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LTC4302IMS-1 Datasheet PDF






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