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Linear Technology Electronic Components Datasheet

LTC4306IUFD Datasheet

2-Wire Bus Multiplexer

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LTC4306
4-Channel,
2-Wire Bus Multiplexer with
Capacitance Buffering
FEATURES
1:4 2-Wire Multiplexer/Switch
Connect SDA and SCL Lines with 2-Wire Bus
Commands
Supply Independent Bidirectional Buffer for SDA
www.DataSheeta4Un.dcoSmCL Lines Increases Fan-Out
Programmable Disconnect from Stuck Bus
Compatible with I2C and SMBus Standards
Rise Time Accelerator Circuitry
SMBus Compatible ALERT Response Protocol
Two General Purpose Inputs-Outputs
Prevents SDA and SCL Corruption During Live Board
Insertion and Removal from Backplane
±10kV Human Body Model ESD Ruggedness
24-Lead QFN (4mm × 5mm) and SSOP Packages
U
APPLICATIO S
Nested Addressing
5V/3.3V Level Translator
Capacitance Buffer/Bus Extender
DESCRIPTIO
The LTC®4306 is a 4-channel, 2-wire bus multiplexer with
bus buffers to provide capacitive isolation between the
upstream bus and downstream buses. Through software
control, the LTC4306 connects the upstream 2-wire bus to
any desired combination of downstream buses. Each
channel can be pulled up to a supply voltage ranging from
2.2V to 5.5V, independent of the LTC4306 supply voltage.
The downstream channels are also provided with
ALERT1-ALERT4 inputs for fault reporting.
Programmable timeout circuitry disconnects the down-
stream buses if the bus is stuck low. When activated, rise
time accelerators source currents into the 2-wire bus pins
to reduce rise time. Driving the ENABLE pin low restores
all features to their default states. Three address pins
provide 27 distinct addresses.
The LTC4306 is available in 24-lead QFN (4mm × 5mm)
and SSOP packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Patent pending.
TYPICAL APPLICATIO
A Level Shifting and Nested Addressing Application
2.5V
3.3V
MICRO-
CONTROLLER
10k 10k 10k
0.01µF
10k 10k 10k
VCC
SCLIN SCL1
SDAIN SDA1
ALERT ALERT1
LTC4306
SFP
MODULE 1
ADDRESS = 1111 000
5V
10k 10k 10k
ADR2 SCL4
ADR1 SDA4
ADR0 ALERT4
GND
4306 TA01a
ADDRESS = 1000 100
SFP
MODULE 4
ADDRESS = 1111 000
VCC = 3.3V
SCLIN
2V/DIV
SCL1
2V/DIV
SCL4
2V/DIV
I2C Bus Waveforms
VBACK = 2.5V
VCARD1 = 3.3V
VCARD4 = 5V
500ns/DIV
4306 TA01b
4306f
1


Linear Technology Electronic Components Datasheet

LTC4306IUFD Datasheet

2-Wire Bus Multiplexer

No Preview Available !

LTC4306
ABSOLUTE AXI U RATI GS (Note 1)
Supply Voltage (VCC) ................................... –0.3V to 7V
Input Voltages (ADR0, ADR1, ADR2,
ENABLE, ALERT1, ALERT2, ALERT3,
ALERT4) .................................................. –0.3V to 7V
Output Voltages (ALERT, READY) ............... –0.3V to 7V
Input/Output Voltages (SDAIN, SCLIN,
SCL1, SDA1, SCL2, SDA2, SCL3,
SDA3, SCL4, SDA4, GPIO1, GPIO2) ........ –0.3V to 7V
www.DataShOeeutt4pUu.ctoSmink Currents (SDAIN, SCLIN, SCL1-4, SDA1-4,
GPI01-2, ALERT, READY) ..................................... 10mA
Operating Temperature Range
LTC4306C ............................................... 0°C to 70°C
LTC4306I ............................................. –40°C to 85°C
Storage Temperature Range
SSOP ................................................. –65°C to 150°C
QFN ................................................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec)
SSOP ................................................................ 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ALERT 1
SDAIN 2
GND 3
SCLIN 4
ENABLE 5
VCC 6
ALERT4 7
24 23 22 21 20
19 ALERT3
18 ALERT1
17 SDA1
25
16 SCL1
15 SCL4
14 SDA4
13 READY
8 9 10 11 12
ORDER PART
NUMBER
LTC4306CUFD
LTC4306IUFD
UF PART MARKING*
4306
UFD PACKAGE
24-LEAD (4mm × 5mm) PLASTIC QFN
EXPOSED PAD (PIN 25), PCB CONNECTION OPTIONAL
MUST BE CONNECTED TO THE PCB TO OBTAIN
θJA = 43°C/W OTHERWISE θJA = 140°C/W. TJMAX = 125°C
TOP VIEW
SCL3 1
SDA3 2
ALERT 3
SDAIN 4
GND 5
SCLIN 6
ENABLE 7
VCC 8
ALERT4 9
GPI01 10
GPI02 11
ADR0 12
24 ALERT2
23 SCL2
22 SDA2
21 ALERT3
20 ALERT1
19 SDA1
18 SCL1
17 SCL4
16 SDA4
15 READY
14 ADR2
13 ADR1
GN PACKAGE
24-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 85°C/W
ORDER PART
NUMBER
LTC4306CGN
LTC4306IGN
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/
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full specified temperature
range, otherwise specifications are at TA = 25°C. VCC = 3.3V unless otherwise noted.
SYMBOL
PARAMETER
Power Supply/Start-Up
VCC
Input Supply Range
ICC
Input Supply Current
ICC ENABLE = 0V Input Supply Current
VUVLOU
UVLO Upper Threshold Voltage
CONDITIONS
MIN TYP MAX UNITS
2.7
5.5
V
Downstream Connected, SCL Bus Low,
SDA Bus High, VCC = 5.5V
VENABLE = 0V, VCC = 5.5V
5.2
8
mA
1.25 2.5
mA
2.3
2.5
2.7
V
4306f
2


Part Number LTC4306IUFD
Description 2-Wire Bus Multiplexer
Maker Linear
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LTC4306IUFD Datasheet PDF






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