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Linear Technology Electronic Components Datasheet

LTC4307IMS8 Datasheet

Low Offset Hot Swappable 2-Wire Bus Buffer

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LTC4307
Low Offset Hot Swappable
2-Wire Bus Buffer with Stuck
Bus Recovery
FEATURES
Bidirectional Buffer with Stuck Bus Recovery
60mV Buffer Offset Independent of Load
30ms Stuck Bus Timeout
Compatible with Non-Compliant VOL I2C Devices
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 I2CTM, I2C Fast Mode and SMBus
READY Open-Drain Output
1V Precharge on All SDA and SCL Lines
High Impedance SDA, SCL Pins for VCC = 0V
Small 8-Lead (3mm × 3mm) DFN and 8-Lead MSOP
Packages
U
APPLICATIO S
Live Board Insertion
Servers
Capacitance Buffer/Bus Extender
RAID Systems
ATCA
DESCRIPTIO
The LTC®4307 hot swappable, 2-wire bus buffer allows
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 VOL tolerance
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.
, 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
TYPICAL APPLICATIO
3.3V
0.01μF
MICRO-
CONTROLLER
10k 10k
VCC
ENABLE
LTC4307
SCLIN SCLOUT
2.7k 2.7k
VCC
ENABLE
100k
LTC4307
SCLIN SCLOUT
10k 10k
0.01μF
CARD_SCL
SDAIN SDAOUT
3.3V
10k
READY
GND
SDAIN SDAOUT
3.3V
10k
READY
GND
4307 TA01a
CARD_SDA
BACKPLANE CARD
CONNECTOR CONNECTOR
CARD
Rising Edge from Asserted Low
1000
800
600
LOW
OFFSET
400
SDAOUT
SDAIN
200
0
0 100 200 300 400 500 600
100ns/DIV
4307 TA01b
4307f
1


Linear Technology Electronic Components Datasheet

LTC4307IMS8 Datasheet

Low Offset Hot Swappable 2-Wire Bus Buffer

No Preview Available !

LTC4307
ABSOLUTE AXI U RATI GS (Notes 1, 7)
VCC to GND ................................................. – 0.3V to 6V
SDAIN, SCLIN, SDAOUT, SCLOUT,
READY, ENABLE.......................................... –0.3V to 6V
Maximum Sink Current (SDAIN, SCLIN, SDAOUT,
SCLOUT, READY).............................................. 50mA
Operating Temperature Range
LTC4307C ................................................ 0°C to 70°C
LTC4307I .............................................–40°C to 85°C
Storage Temperature Range
DFN....................................................– 65°C to 125°C
MSOP ................................................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP ............................................................... 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ENABLE 1
8 VCC
SCLOUT 2
7 SDAOUT
9
SCLIN 3
6 SDAIN
GND 4
5 READY
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 9) CONNECTION TO GND IS OPTIONAL
ORDER PART
NUMBER
LTC4307CDD
LTC4307IDD
DD PART*
MARKING
LBTW
LBTW
TOP VIEW
ENABLE 1
SCLOUT 2
SCLIN 3
GND 4
8 VCC
7 SDAOUT
6 SDAIN
5 READY
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 200°C/W
ORDER PART
NUMBER
LTC4307CMS8
LTC4307IMS8
MS8 PART*
MARKING
LTBTV
LTBTV
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 3.3V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Power Supply
VCC
ICC
ISD
VPRE
tIDLE
VTHR_ENABLE
IENABLE
tPLH_EN
tPHL_EN
tPLH_READY
tPHL_READY
VOL_READY
IOFF_READY
Positive Supply Voltage
Supply Current
Shutdown Supply Current
Precharge Voltage
Bus Idle Time
ENABLE Threshold
ENABLE Input Current
ENABLE Delay Off-On
ENABLE Delay On-Off
READY Delay Off-On
READY Delay On-Off
READY Output Low Voltage
READY Off Leakage Current
2.3
5.5
V
VCC = 5.5V, VSCLOUT = VSDAOUT = 0V (Note 6)
8
11
mA
VCC = 5.5V, ENABLE = GND, SDA, SCL = 5.5V
900 1200
μA
SDA, SCL Floating
0.8
1
1.2
V
55
95
175
μs
0.8
1.4
2
V
ENABLE from 0V to VCC
VCC = 3.3V (Figure 1)
VCC = 3.3V (Note 3) (Figure 1)
VCC = 3.3V (Note 3) (Figure 1)
VCC = 3.3V (Note 3) (Figure 1)
IPULLUP = 3mA, VCC = 2.3V
VCC = READY = 5.5V
0.1
±5
μA
95
μs
10
ns
10
ns
10
ns
0.4
V
0.1
±5
μA
4307f
2


Part Number LTC4307IMS8
Description Low Offset Hot Swappable 2-Wire Bus Buffer
Maker Linear
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