LTC4307CMS8#TRPBF Linear Technology, LTC4307CMS8#TRPBF Datasheet

IC BUFFER 2-WIRE BUS 8-MSOP

LTC4307CMS8#TRPBF

Manufacturer Part Number
LTC4307CMS8#TRPBF
Description
IC BUFFER 2-WIRE BUS 8-MSOP
Manufacturer
Linear Technology
Type
Hot-Swap Switchr
Datasheet

Specifications of LTC4307CMS8#TRPBF

Applications
General Purpose, Buffer/Bus Extender
Internal Switch(s)
Yes
Voltage - Supply
2.3 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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APPLICATIO S
FEATURES
TYPICAL APPLICATIO
0.01μF
CONTROLLER
MICRO-
Bidirectional Buffer with Stuck Bus Recovery
60mV Buffer Offset Independent of Load
30ms Stuck Bus Timeout
Compatible with Non-Compliant V
Prevents SDA and SCL Corruption During Live
Board Insertion and Removal from Backplane
±5kV Human Body Model ESD Protection
Isolates Input SDA and SCL Line from Output
Compatible with I
READY Open-Drain Output
1V Precharge on All SDA and SCL Lines
High Impedance SDA, SCL Pins for V
Small 8-Lead (3mm × 3mm) DFN and 8-Lead MSOP
Packages
Live Board Insertion
Servers
Capacitance Buffer/Bus Extender
RAID Systems
ATCA
3.3V
10k
10k
ENABLE
SCLIN
SDAIN
U
2
LTC4307
C
GND
V
TM
CC
SDAOUT
SCLOUT
READY
, I
2
C Fast Mode and SMBus
3.3V
2.7k
10k
U
2.7k
OL
CONNECTOR
BACKPLANE
CC
I
2
C Devices
= 0V
CONNECTOR
CARD
100k
ENABLE
SCLIN
SDAIN
2-Wire Bus Buffer with Stuck
Low Offset Hot Swappable
DESCRIPTIO
The LTC
I/O card insertion into a live backplane without corrup-
tion of the data and clock busses. The LTC4307 provides
bidirectional buffering, keeping the backplane and card
capacitances isolated. Low offset and high V
allows multiple devices to be cascaded on the clock and
data busses. If SDAOUT or SCLOUT are low for 30ms, the
LTC4307 will automatically break the bus connection. At
this time the LTC4307 automatically generates up to 16
clock pulses on SCLOUT in an attempt to free the bus. A
connection will resume if the stuck bus is cleared.
During insertion, the SDA and SCL lines are pre-charged
to 1V to minimize bus disturbances. When driven high,
the ENABLE input allows the LTC4307 to connect after a
stop bit or bus idle. Driving ENABLE low breaks the con-
nection between SDAIN and SDAOUT, SCLIN and SCLOUT.
READY is an open-drain output which indicates that the
backplane and card sides are connected.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 7032051, 6356140, 6650174
LTC4307
CARD
GND
V
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
CC
SDAOUT
SCLOUT
READY
®
3.3V
4307 TA01a
4307 hot swappable, 2-wire bus buffer allows
10k
10k
10k
CARD_SCL
CARD_SDA
0.01μF
U
1000
800
600
400
200
Bus Recovery
0
Rising Edge from Asserted Low
0
OFFSET
LOW
100
SDAOUT
SDAIN
200
LTC4307
100ns/DIV
300
OL
400
tolerance
500
4307 TA01b
1
4307f
600

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LTC4307CMS8#TRPBF Summary of contents

Page 1

... SDAIN and SDAOUT, SCLIN and SCLOUT. READY is an open-drain output which indicates that the backplane and card sides are connected. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7032051, 6356140, 6650174 2 ...

Page 2

LTC4307 ABSOLUTE AXI U RATI GND ................................................. – 0. SDAIN, SCLIN, SDAOUT, SCLOUT, READY, ENABLE .......................................... –0. Maximum Sink Current (SDAIN, SCLIN, SDAOUT, SCLOUT, READY) .............................................. 50mA Operating Temperature ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER Propagation Delay and Rise-Time Accelerators t SDA/SCL Propagation Delay High to Low PHL t SDA/SCL Propagation Delay Low to High PLH t SDA/SCL Transition Time Low to High ...

Page 4

LTC4307 TIMING DIAGRAMS ENABLE CONNECT READY Rising and Falling Propagation Delay and Rise and Fall Times for SDAIN, SDAOUT and SCLIN, SCLOUT SDAIN/SCLIN SDAOUT/SCLOUT 4 ENABLE, CONNECT, READY Timing t PLH_READY t t PLH_EN PHL_EN PLH PHL ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS I vs Temperature CC 8 5.5V CC 8.0 7.7 7 3.3V CC 7.1 6 2.3V CC 6.5 6.2 5.9 –50 – 100 25 TEMPERATURE ...

Page 6

LTC4307 CTIO S ENABLE (Pin 1): Connection Enable Input. This is a 1.4V digital threshold input pin. For normal operation pull or tie ENABLE high. Driving ENABLE below 0.8V isolates SDAIN from SDAOUT, SCLIN from ...

Page 7

W BLOCK DIAGRA 8mA SDAIN 6 SLEW RATE DETECTOR 100k 100k 8mA SCLIN 3 SLEW RATE DETECTOR + – 0.55V CC + – 0.55V CC ENABLE + 1 – 1.4V OPERATION Start-Up When the LTC4307 fi rst receives power on ...

Page 8

LTC4307 OPERATION moment of connection, therefore minimizing the amount of disturbance caused by the I/O card. Once the LTC4307 comes out of UVLO, it monitors both the backplane and card sides for either a stop bit or bus idle condition ...

Page 9

OPERATION OUTPUT SIDE 50pF 1V/DIV 200ns/DIV Figure 2. Input-Output Rising Edge Waveforms Bus Stuck Low Timeout When SDAOUT or SCLOUT is low, an internal timer is started. The timer is only reset by that respective input going high ...

Page 10

... For a given I/O card, the LTC4307 drives the capacitance of everything on the card and the backplane must drive only the capacitance of the LTC4307, which is less than 10pF. Hot Swap is a trademark of Linear Technology Corporation. BACKPLANE ...

Page 11

APPLICATIONS INFORMATION The ENABLE pin is driven using a short pin. This is to ensure that a connection is not enabled until the transients associated with live insertion have settled. Figure 5 shows the LTC4307 in an application where all ...

Page 12

LTC4307 APPLICATIONS INFORMATION Systems with Supply Voltage Droop In large 2-wire systems, the V voltages seen by devices CC at various points in the system can differ by a few hundred 3. 10k 10k 10k SDA1 SCL1 ...

Page 13

TYPICAL APPLICATIONS TEMPERATURE SENSOR SHELF MANAGER DC/DC 3. 10k 10k V ENABLE SDAIN ShMC LTC4307 SCLIN High V Application 1.8k CC 1.8k R3 ENABLE 200Ω SCLIN SCLOUT R4 LTC4307 200Ω ...

Page 14

LTC4307 PACKAGE DESCRIPTION 3.5 ±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-1) ...

Page 15

... 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 16

... LTC4302-1/LTC4302-2 Addressable 2-Wire Bus Buffer LTC4303/LTC4304 Hot Swappable 2-Wire Bus Buffers with Stuck Bus Recovery LTC4305/LTC4306 2-/4-Channel, 2-Wire Bus Multiplexers with Capacitance Buffering ThinSOT is a trademark of Linear Technology Corporation Linear Technology Corporation 16 1630 McCarthy Blvd., Milpitas, CA 95035-7417 ● (408) 432-1900 FAX: (408) 434-0507 C2 0 ...

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