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LTC4305CDHD#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTC4305
1
4305f
APPLICATIO S
U
TYPICAL APPLICATIO
U
FEATURES
DESCRIPTIO
U
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.
■
Nested Addressing
■
5V/3.3V Level Translator
■
Capacitance Buffer/Bus Extender
■
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 I
2
C 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
2-Channel,
2-Wire Bus Multiplexer with
Capacitance Buffering
, LTC and LT are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Patent Pending.
A Level-Shifting and Nested Addressing Application
10k
0.01µF
10k 10k10k 10k10k
ADDRESS = 1000 100
SFP
MODULE #1
10k 10k 10k
ADDRESS = 1111 000
MICRO-
CONTROLLER
SFP
MODULE #2
ADDRESS = 1111 000
2.5V
5V
3.3V
4305 TA01
SCLIN
SDAIN
ALERT
ADR2
ADR1
ADR0
GND
SCL1
SDA1
ALERT1
SCL2
SDA2
ALERT2
V
CC
LTC4305
4305 TA01b
V
CC
= 3.3V
VCARD1 = 3.3V
VCARD2 = 5V
VBACK = 2.5V
SCL2
2V/DIV
500ns/DIV
SCL1
2V/DIV
SCLIN
2V/DIV
I
2
C Bus Waveforms
LTC4305
4305f
2
ABSOLUTE AXI U RATI GS
W
WW
U
(Note 1)
Supply Voltage (V
CC
) ................................... –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
ELECTRICAL CHARACTERISTICS
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.
PACKAGE/ORDER I FOR ATIO
UU
W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
GN PART MARKING
4305
4305I
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/
T
JMAX
= 125°C, θ
JA
= 135°C/W
1
2
3
4
5
6
7
8
TOP VIEW
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
16
15
14
13
12
11
10
9
ALERT2
ALERT
SDAIN
GND
SCLIN
ENABLE
V
CC
ADR0
SCL2
SDA2
ALERT1
SDA1
SCL1
READY
ADR2
ADR1
16
15
14
13
12
11
10
9
17
1
2
3
4
5
6
7
8
SCL2
SDA2
ALERT1
SDA1
SCL1
READY
ADR2
ADR1
ALERT2
ALERT
SDAIN
GND
SCLIN
ENABLE
V
CC
ADRO
TOP VIEW
DHD PACKAGE
16-LEAD (4mm × 5mm) PLASTIC DFN
EXPOSED PAD (PIN 17) PCB CONNECTION OPTIONAL
MUST BE CONNECTED TO PCB TO OBTAIN
θ
JA
= 43°C/W OTHERWISE θ
JA
= 140°C/W. T
JMAX
= 125°C
LTC4305CDHD
LTC4305IDHD
ORDER PART NUMBER DHD PART MARKING
4305
4305
LTC4305CGN
LTC4305IGN
ORDER PART NUMBER
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, V
CC
= 5.5V ● 5.2 8 mA
SCL Bus Low, SDA Bus High
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
V
UVLOHYST
UVLO Threshold Hysteresis Voltage ● 100 175 250 mV
LTC4305
3
4305f
ELECTRICAL CHARACTERISTICS
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
TH EN
ENABLE Falling Threshold Voltage ● 0.8 1.0 1.2 V
V
EN HYST
ENABLE Threshold Hysteresis Voltage 60 mV
t
PHL EN
ENABLE Delay, On-Off 60 ns
t
PLH EN
ENABLE Delay, Off-On 20 ns
I
IN
EN
ENABLE Input Leakage Current V
ENABLE
= 0V, 5.5V, V
CC
= 5.5V ● 0.1 ±
1 µA
V
LOW READY
READY Pin Logic Low Output Voltage I
PULL-UP
= 3mA, V
CC
= 2.7V ● 0.18 0.4 V
I
OFF READY
READY Off State Input Leakage Current V
READY
= 0V, 5.5V, V
CC
= 5.5V ● 0 ±
1 µA
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,
ALERT1–2
ALERT1–ALERT2 Input Current V
ALERT1–2
= 0V, 5.5V ● 0 ±
1 µA
V
ALERT1–2(IN)
ALERT1–ALERT2 Pin Input Falling 0.8 1.0 1.2 V
Threshold Voltages
●
V
ALERT1–2(HY)
ALERT1–ALERT2 Pin Input Threshold 80 mV
Hysteresis Voltages
Rise Time Accelerators
V
SDA,SCL slew
Initial Slew Requirement to Activate SDAIN, SCLIN, SDA1–2, 0.4 0.8 V/µs
Rise Time Accelerator Currents SCL1–2 Pins
●
V
RISE,DC
Rise Time Accelerator DC Threshold Voltage SDAIN, SCLIN, SDA1–2, 0.7 0.8 1 V
SCL1–2 Pins
●
I
BOOST
Rise Time Accelerator Pull-Up Current SDAIN, SCLIN, SDA1–2, 4 5.5 mA
SCL1–2 Pins (Note 3)
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
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
V
OL
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; ● ±5 µA
V
CC
= 0 to 5.5V;
Buffers Inactive
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC4305CDHD#TRPBF

Mfr. #:
Buy LTC4305CDHD#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Multiplexer Switch ICs 2:1 I2C MUX and Bus Buffer
Lifecycle:
New from this manufacturer.
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