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LTC4306IUFD#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTC4306
1
4306f
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.
■
Nested Addressing
■
5V/3.3V Level Translator
■
Capacitance Buffer/Bus Extender
■
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
2
C 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
4-Channel,
2-Wire Bus Multiplexer with
Capacitance Buffering
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Patent pending.
V
CC
0.01µF
3.3V
•
•
•
2.5V
5V
10k
LTC4306
ADDRESS = 1000 100
ADDRESS = 1111 000
ADDRESS = 1111 000
SCL1
SDA1
ALERT1
SCLIN
SDAIN
ALERT
SCL4
SDA4
ALERT4
ADR2
ADR1
ADR0
GND
SFP
MODULE 1
MICRO-
CONTROLLER
10k 10k
10k
10k
10k
10k
SFP
MODULE 4
10k 10k
4306 TA01a
A Level Shifting and Nested Addressing Application
4306 TA01b
V
CC
= 3.3V
VCARD1 = 3.3V
VCARD4 = 5V
VBACK = 2.5V
SCL4
2V/DIV
500ns/DIV
SCL1
2V/DIV
SCLIN
2V/DIV
I
2
C Bus Waveforms
LTC4306
4306f
2
(Note 1)
Supply Voltage (V
CC
) ................................... –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
Output Sink 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
ORDER PART
NUMBER
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
LTC4306CUFD
LTC4306IUFD
EXPOSED PAD (PIN 25), PCB CONNECTION OPTIONAL
MUST BE CONNECTED TO THE PCB TO OBTAIN
θ
JA
= 43°C/W OTHERWISE θ
JA
= 140°C/W. T
JMAX
= 125°C
UF PART MARKING*
4306
PACKAGE/ORDER I FOR ATIO
UU
W
ORDER PART
NUMBER
LTC4306CGN
LTC4306IGN
T
JMAX
= 125°C, θ
JA
= 85°C/W
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
GN PACKAGE
24-LEAD PLASTIC SSOP
24
23
22
21
20
19
18
17
16
15
14
13
SCL3
SDA3
ALERT
SDAIN
GND
SCLIN
ENABLE
V
CC
ALERT4
GPI01
GPI02
ADR0
ALERT2
SCL2
SDA2
ALERT3
ALERT1
SDA1
SCL1
SCL4
SDA4
READY
ADR2
ADR1
8 9
TOP VIEW
25
UFD PACKAGE
24-LEAD (4mm × 5mm) PLASTIC QFN
10 11 12
24 23 22 21 20
6
5
4
3
2
1
ALERT
SDAIN
GND
SCLIN
ENABLE
V
CC
ALERT4
ALERT3
ALERT1
SDA1
SCL1
SCL4
SDA4
READY
SDA3
SCL3
ALERT2
SCL2
SDA2
GPIO1
GPI02
ADR0
ADR1
ADR2
7
14
15
16
17
18
19
13
ABSOLUTE AXI U RATI GS
WWWU
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/
The ● denotes specifications which apply over the full specified temperature
range, otherwise specifications are at T
A
= 25°C. V
CC
= 3.3V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply/Start-Up
V
CC
Input Supply Range ● 2.7 5.5 V
I
CC
Input Supply Current Downstream Connected, SCL Bus Low, ● 5.2 8 mA
SDA Bus High, V
CC
= 5.5V
I
CC ENABLE
=
0V Input Supply Current V
ENABLE
= 0V, V
CC
= 5.5V ● 1.25 2.5 mA
V
UVLOU
UVLO Upper Threshold Voltage ● 2.3 2.5 2.7 V
ELECTRICAL CHARACTERISTICS
LTC4306
3
4306f
The ● denotes specifications which apply over the full specified temperature
range, otherwise specifications are at T
A
= 25°C. V
CC
= 3.3V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
UVLOHYST
UVLO Threshold Hysteresis Voltage ● 100 175 250 mV
V
TH EN
ENABLE Falling Threshold Voltage ● 0.8 1.0 1.2 V
V
ENHYST
ENABLE Threshold Hysteresis Voltage 60 mV
t
PHLEN
ENABLE Delay, On-Off 60 ns
t
PLHEN
ENABLE Delay, Off-On 20 ns
I
INEN
ENABLE Input Leakage Current V
ENABLE
= 0V, 5.5V, V
CC
= 5.5V ● 0 ±
1 µA
V
LOWREADY
READY Pin Logic Low Output Voltage I
PULL-UP
= 3mA, V
CC
= 2.7V ● 0.18 0.4 V
I
OFFREADY
READY Off State Input Leakage Current V
READY
= 0V, 5.5V, V
CC
= 5.5V ● 0 ±
1 µA
Upstream-Downstream Buffers
V
OS,BUF
Buffer Offset Voltage R
BUS
= 10k, V
CC
= 2.7V, 5.5V (Note 4) ● 25 60 100 mV
V
OS,UP-BUF
Upstream Buffer Offset Voltage V
CC
= 2.7V, R
BUS
= 2.7k (Note 4) ● 40 80 120 mV
V
IN, BUFFER
= 0V V
CC
= 5.5V, R
BUS
= 2.7k (Note 4) ● 70 110 150 mV
V
OS,DOWN-BUF
Downstream Buffer Offset Voltage V
CC
= 2.7V, R
BUS
= 2.7k (Note 4) ● 60 110 160 mV
V
IN, BUFFER
= 0V V
CC
= 5.5V, R
BUS
= 2.7k (Note 4) ● 80 140 200 mV
V
OL
Output Low Voltage, V
IN,BUFFER
= 0V SDA, SCL Pins; I
SINK
= 4mA, ● 400 mV
V
CC
= 3V, 5.5V
Output Low Voltage, V
IN,BUFFER
= 0.2V SDA, SCL Pins; I
SINK
= 500µA, ● 320 mV
V
CC
= 2.7V, 5.5V
V
IL,MAX
Buffer Input Logic Low Voltage V
CC
= 2.7V, 5.5V ● 0.4 0.52 0.64 V
V
THSDA,SCL
Downstream SDA, SCL Logic Threshold Voltage ● 0.8 1.0 1.2 V
I
LEAK
Input Leakage Current SDA, SCL Pins; V
CC
= 0V to 5.5V; ● 0 ±
5 µA
Buffers Inactive
Rise Time Accelerators
V
SDA,SCL slew
Minimum Slew Requirement to Activate SDAIN, SCLIN, SDA1-4, SCL1-4 Pins ● 0.4 0.8 V/µs
Rise Time Accelerator Currents
V
RISE,DC
Rise Time Accelerator DC Threshold Voltage SDAIN, SCLIN, SDA1-4, SCL1-4 Pins ● 0.7 0.8 1 V
I
BOOST
Rise Time Accelerator Pull-Up Current SDAIN, SCLIN, SDA1-4, SCL1-4 Pins 4 5.5 mA
(Note 3)
GPIOs
V
GPIO(TH)
GPIO Pin Input Threshold ● 0.8 1 1.2 V
V
GPIO(OL)
GPIO Pin Output Low Voltage I
GPIO
= 5mA, V
CC
= 2.7V ● 0.2 0.4 V
V
GPIO(OH)
GPIO Pin Output High Voltage I
GPIO
= –200µA, V
CC
= 2.7V ● V
CC
– 0.3 V
I
GPIO(IN)
GPIO Pin Input Leakage Current V
GPIO
= 0V, 5.5V, V
CC
= 5.5V ● 0 ±
1 µA
Stuck Low Timeout Circuitry
V
TIMER(L)
Stuck Low Falling Threshold Voltage V
CC
= 2.7V, 5.5V ● 0.4 0.52 0.64 V
V
TIMER(HYST)
Stuck Low Threshold Hysteresis Voltage 80 mV
T
TIMER1
Timeout Time #1 TIMSET1,0 = 01 ● 25 30 35 ms
T
TIMER2
Timeout Time #2 TIMSET1,0 = 10 ● 12.5 15 17.5 ms
T
TIMER3
Timeout Time #3 TIMSET1,0 = 11 ● 6.25 7.5 8.75 ms
ALERT
V
ALERT(OL)
ALERT Output Low Voltage I
ALERT
= 3mA, V
CC
= 2.7V ● 0.2 0.4 V
I
OFF,ALERT
ALERT Off State Input Leakage Current V
ALERT
= 0V, 5.5V ● 0 ±
1 µA
I
IN,ALERT1-4
ALERT1-ALERT4 Input Current V
ALERT1-4
= 0V, 5.5V ● 0 ±
1 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC4306IUFD#TRPBF

Mfr. #:
Buy LTC4306IUFD#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Multiplexer Switch ICs 4:1 I2C MUX and Bus Buffer
Lifecycle:
New from this manufacturer.
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