LTC4306IUFD Linear Technology, LTC4306IUFD Datasheet

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LTC4306IUFD

Manufacturer Part Number
LTC4306IUFD
Description
IC MUX 4CH 2-WIRE BUS 24-QFN
Manufacturer
Linear Technology
Datasheet

Specifications of LTC4306IUFD

Applications
Multiplexer with Amplifier
Interface
SMBus (2-Wire/I²C)
Voltage - Supply
2.2 V ~ 5.5 V
Package / Case
24-QFN
Mounting Type
Surface Mount
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC4306IUFD
Manufacturer:
LT
Quantity:
10 000
Part Number:
LTC4306IUFD
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC4306IUFD#PBF
Manufacturer:
LT
Quantity:
3 500
Company:
Part Number:
LTC4306IUFD#TRPBF
Quantity:
3 100
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
CONTROLLER
1:4 2-Wire Multiplexer/Switch
Connect SDA and SCL Lines with 2-Wire Bus
Commands
Supply Independent Bidirectional Buffer for SDA
and SCL Lines Increases Fan-Out
Programmable Disconnect from Stuck Bus
Compatible with I
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
Nested Addressing
5V/3.3V Level Translator
Capacitance Buffer/Bus Extender
MICRO-
2.5V
A Level Shifting and Nested Addressing Application
10k
10k
U
2
C and SMBus Standards
10k
ADDRESS = 1000 100
SCLIN
SDAIN
ALERT
ADR2
ADR1
ADR0
GND
LTC4306
3.3V
V
CC
ALERT1
ALERT4
0.01µF
SDA1
SDA4
SCL1
SCL4
U
4306 TA01a
10k
10k
10k
10k
5V
ADDRESS = 1111 000
ADDRESS = 1111 000
10k
10k
MODULE 1
MODULE 4
SFP
SFP
DESCRIPTIO
The LTC
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.
All other trademarks are the property of their respective owners. Patent pending.
, LTC and LT are registered trademarks of Linear Technology Corporation.
2V/DIV
2V/DIV
2V/DIV
2-Wire Bus Multiplexer with
SCLIN
SCL1
SCL4
®
4306 is a 4-channel, 2-wire bus multiplexer with
V
Capacitance Buffering
CC
= 3.3V
U
I
2
C Bus Waveforms
500ns/DIV
4-Channel,
LTC4306
VBACK = 2.5V
VCARD1 = 3.3V
VCARD4 = 5V
4306 TA01b
1
4306f

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LTC4306IUFD Summary of contents

Page 1

... 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. 10k 10k ...

Page 2

... 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° ORDER PART NUMBER SCL3 SDA3 LTC4306CUFD ALERT LTC4306IUFD SDAIN GND SCLIN ENABLE PART MARKING* ALERT4 GPI01 4306 GPI02 ADR0 T ...

Page 3

ELECTRICAL CHARACTERISTICS range, otherwise specifications are SYMBOL PARAMETER V UVLO Threshold Hysteresis Voltage UVLOHYST V ENABLE Falling Threshold Voltage ENABLE Threshold Hysteresis Voltage ENHYST t ENABLE Delay, On-Off PHLEN t ENABLE Delay, Off-On PLHEN ...

Page 4

LTC4306 ELECTRICAL CHARACTERISTICS range, otherwise specifications are at T SYMBOL PARAMETER V ALERT1-ALERT4 Pin Input Falling ALERT1-4(IN) Threshold Voltages V ALERT1-ALERT4 Pin Input Threshold ALERT1-4(HY) Hysteresis Voltages Interface V ADR0-2 Input High Voltage ADR(H) V ADR0-2 Input ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS Buffer Circuitry t PHL vs Temperature 120 100 100 125 –50 – TEMPERATURE (°C) 4306 G01 ...

Page 6

LTC4306 CTIO S (GN24 Package/UFD24 Package) ALERT (Pin 3/Pin 1): Fault Alert Output. An open-drain output that is pulled low when a fault occurs to alert the host controller. The LTC4306 pulls ALERT low when ...

Page 7

W BLOCK DIAGRA LTC4306 4306f 7 ...

Page 8

LTC4306 U OPERATIO Control Register Bit Definitions Register 0 (00h) BIT NAME TYPE* DESCRIPTION d7 Downstream R Indicates if upstream bus is connected Connected to any downstream buses 0 = upstream bus disconnected from all downstream buses 1 = upstream ...

Page 9

U OPERATIO Register 2 (02h) BIT NAME TYPE* DESCRIPTION d7 GPIO1 Mode R/W Configures Input/Output mode of Configure GPIO1 0 = output mode (default input mode d6 GPIO2 Mode R/W Configures Input/Output Mode of Configure GPIO2 0 = ...

Page 10

LTC4306 U OPERATIO The LTC4306 is a 4-channel, 2-wire bus multiplexer/ switch with bus buffers to provide capacitive isolation between the upstream bus and downstream buses. Mas- ters on the upstream 2-wire bus (SDAIN and SCLIN) can command the LTC4306 ...

Page 11

U OPERATIO V CC SDA1 N1 V SDA2 N2 Figure 1. Example of Unacceptable Level Shifting Rise Time Accelerators The Upstream Accelerators Enable and Downstream Ac- celerators Enable bits of register 1 activate the upstream and downstream rise time accelerators, ...

Page 12

LTC4306 U OPERATIO In all other cases, the LTC4306 communicates with the master to resolve the fault. After the master broadcasts the Alert Response Address (ARA), the LTC4306 will respond with its address on the SDAIN line and release the ...

Page 13

U OPERATIO 2 Table 1. LTC4306 I C Device Addressing HEX DEVICE DESCRIPTION ADDRESS h a6 Mass Write BA 1 Alert Response ...

Page 14

LTC4306 U OPERATIO a6-a0 SDA SCL 1-7 S START ADDRESS CONDITION a4-a0 START SLAVE ADDRESS a4-a0 WR ACK START SLAVE S ADDRESS 35Ω, making the GPIO pull-downs capable of ...

Page 15

U OPERATIO Fall Time Control 2 Per the I C Fast Mode (400kHz) Specification, the two- wire bus digital interface circuitry provides fall time con- trol when forcing logic lows onto the SDAIN bus. The fall time always meets the ...

Page 16

LTC4306 U U APPLICATIO S I FOR ATIO Assume in Figure 5 that the total parasitic bus capacitance on SDA1 due to trace and device capacitance is 100pF. To ensure that the boost currents are active during rising edges, the ...

Page 17

U U APPLICATIO S I FOR ATIO R2 R3 10k 10k µ 0.01µF 10k 10k SCL1 4 17 SCLIN SDA1 18 ALERT1 2 SDAIN 5 ENABLE 1 ...

Page 18

LTC4306 U U APPLICATIO S I FOR ATIO 10k 10k µ 10k V CC OPEN BACKPLANE CONNECTOR SCL1 4 SCLIN SDA1 ALERT1 2 SDAIN 5 ...

Page 19

... DRAWING NOT TO SCALE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. U UFD Package ...

Page 20

... Hot Swappable 2-Wire Bus Buffer with Low Voltage Level Translation LTC4303/LTC4304 How Swappable Bus Buffers with Stuck Bus Recovery LTC4305 2-Channel 2-Wire Multiplexer with Capacitance Buffering ThinSOT is a trademark of Linear Technology Corporation. Linear Technology Corporation 20 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● ...

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