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Linear Technology Electronic Components Datasheet

LTC4305CGN Datasheet

2-Wire Bus Multiplexer

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LTC4305 www.DataSheet4U.com
2-Channel,
2-Wire Bus Multiplexer with
Capacitance Buffering
FEATURES
1:2 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 I2C and SMBus Standards
Rise Time Accelerator Circuitry
SMBus Compatible ALERT Response Protocol
Prevents SDA and SCL Corruption During Live Board
Insertion and Removal from Backplane
±10kV Human Body Model ESD Ruggedness
16-Lead (4mm × 5mm) DFN and SSOP Packages
U
APPLICATIO S
Nested Addressing
5V/3.3V Level Translator
Capacitance Buffer/Bus Extender
DESCRIPTIO
The LTC®4305 is a 2-channel, 2-wire bus multiplexer with
bus buffers to provide capacitive isolation between the
upstream bus and downstream buses. Through software
control, the LTC4305 connects the upstream 2-wire bus
to any desired combination of downstream channels.
Each channel can be pulled up to a supply voltage ranging
from 2.2V to 5.5V, independent of the LTC4305 supply
voltage. The downstream channels are also provided with
an ALERT1–ALERT2 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 LTC4305 is available in 16-lead (4mm × 5mm) DFN
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
0.01µF
MICRO-
CONTROLLER
10k 10k 10k
VCC
SCLIN
SCL1
SDAIN SDA1
ALERT ALERT1
LTC4305
10k 10k 10k
SFP
MODULE #1
ADDRESS = 1111 000
5V
ADR2
10k
ADR1
SCL2
ADR0
SDA2
GND
ALERT2
4305 TA01
ADDRESS = 1000 100
10k 10k
SFP
MODULE #2
ADDRESS = 1111 000
VCC = 3.3V
SCLIN
2V/DIV
SCL1
2V/DIV
SCL2
2V/DIV
I2C Bus Waveforms
VBACK = 2.5V
VCARD1 = 3.3V
VCARD2 = 5V
500ns/DIV
4305 TA01b
4305f
1


Linear Technology Electronic Components Datasheet

LTC4305CGN Datasheet

2-Wire Bus Multiplexer

No Preview Available !

LTC4305
www.DataSheet4U.com
ABSOLUTE AXI U RATI GS (Note 1)
Supply Voltage (VCC) ................................... –0.3V to 7V
Input Voltages (ADR0, ADR1, ADR2,
ENABLE, ALERT1, ALERT2) .................... –0.3V to 7V
Output Voltages (ALERT, READY) ............... –0.3V to 7V
Input/Output Voltages (SDAIN, SCLIN,
SCL1, SDA1, SCL2, SDA2) ...................... –0.3V to 7V
Output Sink Current (SDAIN, SCLIN, SCL1,
SDA1, SCL2, SDA2, ALERT, READY) ............... 10mA
Operating Temperature Range
LTC4305C ............................................... 0°C to 70°C
LTC4305I ............................................. –40°C to 85°C
Storage Temperature Range
DHD Package .................................... –65°C to 125°C
GN Package ....................................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
GN Package ...................................................... 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ALERT2 1
ALERT 2
SDAIN 3
GND 4
SCLIN 5
ENABLE 6
VCC 7
ADRO 8
16 SCL2
15 SDA2
14 ALERT1
13 SDA1
17
12 SCL1
11 READY
10 ADR2
9 ADR1
DHD PACKAGE
16-LEAD (4mm × 5mm) PLASTIC DFN
EXPOSED PAD (PIN 17) PCB CONNECTION OPTIONAL
MUST BE CONNECTED TO PCB TO OBTAIN
θJA = 43°C/W OTHERWISE θJA = 140°C/W. TJMAX = 125°C
ORDER PART NUMBER DHD PART MARKING
TOP VIEW
ALERT2 1
ALERT 2
SDAIN 3
GND 4
SCLIN 5
ENABLE 6
VCC 7
ADR0 8
16 SCL2
15 SDA2
14 ALERT1
13 SDA1
12 SCL1
11 READY
10 ADR2
9 ADR1
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
TJMAX = 125°C, θJA = 135°C/W
ORDER PART NUMBER
GN PART MARKING
LTC4305CDHD
4305
LTC4305IDHD
4305
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marketing: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTC4305CGN
LTC4305IGN
4305
4305I
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
VUVLOU
VUVLOHYST
Input Supply Current
UVLO Upper Threshold Voltage
UVLO Threshold Hysteresis Voltage
CONDITIONS
MIN TYP MAX UNITS
2.7
5.5
V
Downstream Connected, VCC = 5.5V
SCL Bus Low, SDA Bus High
5.2
8
mA
VENABLE = 0V, VCC = 5.5V
1.25 2.5
mA
2.3
2.5
2.7
V
100 175 250
mV
4305f
2


Part Number LTC4305CGN
Description 2-Wire Bus Multiplexer
Maker Linear
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