LTC4310CDD-2#PBF Linear Technology, LTC4310CDD-2#PBF Datasheet

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LTC4310CDD-2#PBF

Manufacturer Part Number
LTC4310CDD-2#PBF
Description
IC I2C ISOLATOR SMBUS 10DFN
Manufacturer
Linear Technology
Type
Hot-Swap I²C Isolatorsr
Datasheet

Specifications of LTC4310CDD-2#PBF

Tx/rx Type
I²C Logic
Capacitance - Input
10pF
Voltage - Supply
3 V ~ 5.5 V
Current - Supply
7mA
Mounting Type
Surface Mount
Package / Case
10-DFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Delay Time
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC4310CDD-2#PBFLTC4310CDD-2
Manufacturer:
LT
Quantity:
10 000
applicaTions
Typical applicaTion
FeaTures
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
SDA1
SCL1
3.3V
3.3k
Bidirectional I
Isolated Buses
Full Isolation with Inexpensive Ethernet
Transformers or Capacitors
Low Voltage Level Shifting
I
I
±5kV Human Body Model ESD Protection
Rise Time Accelerators
SDA, SCL Hot-Swapping
Very Low Shutdown Current
Stuck Bus Disconnect and Recovery
Thermal Shutdown
10-Lead MSOP and 3mm × 3mm DFN Packages
Isolated I
Isolated Power Supplies
Positive-to-Negative Rail Communications
Power-over-Ethernet
2
2
C Maximum Operating Frequency:
C Specification Compliant V
100kHz for LTC4310-1
400kHz for LTC4310-2
3.3k
0.01µF
2
C, SMBus and PMBus Interfaces
SDA
SCL
READY
EN
LTC4310-1
GND
V CC
2
C Communication Between Two
RXP
RXN
TXP
TXN
0.01µF
1500V Isolated I
ETHERNET TRANSFORMER
10/100Base-TX
OL
EPF8119S
, V
IL
2
C System
0.01µF
RXP
RXN
TXP
TXN GND
LTC4310-1
READY
SDA
V CC
SCL
EN
DescripTion
The LTC
between two I
one another. Each LTC4310 encodes I
into signals that are transmitted across an isolation barrier
to another LTC4310. The receiving LTC4310 decodes the
transmission and drives its l
state. The isolation barrier can be bridged by an inexpensive
Ethernet, or other transformer, to achieve communications
across voltage differences reaching thousands of volts, or
it can be bridged by capacitors for lower voltage isolation.
The LTC4310-1 is intended for use in 100kHz I
The LTC4310-2 is intended for 400kHz I
Rise time accelerators provide strong pull-up currents on
SCL and SDA rising edges to meet rise time specifications
for heavily loaded systems. Data and clock Hot Swap™
circuitry prevent data corruption when a card is inserted
into or removed from a live bus. When a bus is stuck low
for 37ms, the LTC4310 turns off its pull-down devices and
generates up to sixteen clocks and a STOP bit in an attempt
to free the bus. Driving EN low sets the LTC4310 in a very
low current shutdown mode to conserve power.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
0.01µF
3.3k
®
4310 provides bidirectional I
3.3k
ISOLATED
5V
SDA2
SCL2
431012 TA01a
LTC4310-1/LTC4310-2
2
C buses whose grounds are isolated from
20kV/µs
0V
0V
Hot-Swappable
20kV/µs Common Mode Transient
SDA
SCL
LTC4310 Operating Through
2
C bus to the appropriate logic
I
2
2µs/DIV
C Isolators
2
2
C communications
C bus logic states
2
C systems.
2
C systems.
431012 TA01b
431012f
2V/DIV
500V/
DIV


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LTC4310CDD-2#PBF Summary of contents

Page 1

... Driving EN low sets the LTC4310 in a very low current shutdown mode to conserve power. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. ...

Page 2

... TAPE AND REEL LTC4310CDD-1#PBF LTC4310CDD-1#TRPBF LTC4310IDD-1#PBF LTC4310IDD-1#TRPBF LTC4310CMS-1#PBF LTC4310CMS-1#TRPBF LTC4310IMS-1#PBF LTC4310IMS-1#TRPBF LTC4310CDD-2#PBF LTC4310CDD-2#TRPBF LTC4310IDD-2#PBF LTC4310IDD-2#TRPBF LTC4310CMS-2#PBF LTC4310CMS-2#TRPBF LTC4310IMS-2#PBF LTC4310IMS-2#TRPBF Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: ...

Page 3

T SYMBOL PARAMETER Supplies V Input Supply Range CC I Input Supply Current, LTC4310-1 CC Input Supply Current, LTC4310-2 I Shutdown Input Supply Current CC(SD) V Input Supply Undervoltage Lockout CCH(UVL) Rising ...

Page 4

LTC4310-1/LTC4310-2 elecTrical characTerisTics temperature range, otherwise specifications are at T SYMBOL PARAMETER t Maximum Time Between TXP , TXN MAX(TX) Transmit Events t Maximum Time Between RXP , RXN MAX(RX) Receive Events Transmit Outputs V TXP , TXN Single-Ended Output ...

Page 5

Typical perForMance characTerisTics I vs Temperature, LTC4310-1 CC 5.0 SDA = 0V V SCL = 4.8 4 4.4 4.2 4.0 –50 – TEMPERATURE (°C) SDA, SCL Controlled Rising Edge Rate vs Temperature, LTC4310-2 ...

Page 6

LTC4310-1/LTC4310-2 pin FuncTions EN (Pin 1): Device Enable Input. Pulling sets the device in normal operation mode, allowing bus information to be sent and received across the barrier. Grounding EN disables communication across the bar- rier ...

Page 7

FuncTional DiagraM LOGIC BOOST SDA 2 RISE RATE LIMITER dV/dt RISE V CC LOGIC I BOOST SCL 3 RISE RATE LIMITER dV/dt RISE UVLO V CC – 2.4V/2.21V + 0.45 • ...

Page 8

LTC4310-1/LTC4310-2 operaTion (LTC4310 refers to both LTC4310-1 and LTC4310-2) The LTC4310 provides fully bidirectional communications 2 between two SMBus buses whose grounds are isolated from one another. Clock stretching, clock syn- chronization, arbitration and data acknowledging all ...

Page 9

C1 0.01µ 7.5k 7.5k LTC4310 40pF BUS SDA SCL1 SCL µP SLAVE GND Figure 1. The LTC4310 Transformer Isolated Application 10/100Base- ETHERNET 10k 10k TRANSFORMER READY 1 ...

Page 10

LTC4310-1/LTC4310-2 applicaTions inForMaTion SDA, SCL Bus Pull-Up Resistor Value Selection When the SDA (or SCL) bus is rising between 0V and 0.35 • the LTC4310 controls the bus rise rate to CC (0.35 • V )/900ns for the ...

Page 11

Bus Rising Edge Waveform When all external pull-downs on SCL1 (Figure 1) turn off, the SCL1 rising waveform will resemble that shown in Figure 4. The LTC4310-1 senses that SCL1 is rising and transmits a message to the ...

Page 12

LTC4310-1/LTC4310-2 applicaTions inForMaTion quiet if it has been idle high for at least 115µ STOP bit has occurred and both data and clock have remained high since the STOP bit. This functionality makes the LTC4310 ideal for ...

Page 13

Once a STOP bit or bus idle occurs on both the local and isolated buses, the LTC4310 reactivates its buffers and rise time accelerators. READY Digital Output The READY pin provides a digital output flag that pulls low ...

Page 14

LTC4310-1/LTC4310-2 applicaTions inForMaTion TYPICAL APPLICATIONS Figure 8 shows the LTC4310-1 providing I 2 tions between bus referenced to system ground and bus using –5V for its ground reference. Ceramic coupling capacitors, C1-C5, are ...

Page 15

3.3k 3.3k 10k C = 200pF BUS µP OFF Figure 9. The LTC4310 Zero Current Shutdown Application BACKPLANE CONNECTOR BACKPLANE 10k SDA C = 400pF BUS ...

Page 16

LTC4310-1/LTC4310-2 applicaTions inForMaTion LTC4310 Compatibility with Other LTC Bus Buffers The LTC4310 cannot be used on the same I LTC4300A-1, LTC4303 or LTC4307. During rising edges, the rise time accelerators of these buffers turn on before the LTC4310 disables its ...

Page 17

Typical applicaTions Transformer Selection Guide As shown in Figure 1, a transformer passes transmit and receive signals between the two LTC4310’s. The transmit signals have 1.25V magnitude and 35ns pulse width. The receive circuitry has an equivalent input impedance of ...

Page 18

LTC4310-1/LTC4310-2 package DescripTion 3.50 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) 0.25 ± 0.05 0.50 BSC 2.38 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2). ...

Page 19

... LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 20

... Detect Low Power Standby, Low <5µA Supply Shutdown Current, ±8kV HBM ESD Tolerance www.linear.com ● 10k 10k 10k SDA C = 20pF BUS SCL EN 431012 TA02 and ACC, CC2 and ENABLE CC2 2 C Busses LT 0410 • PRINTED IN USA  LINEAR TECHNOLOGY CORPORATION 2010 431012f ...

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