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LTC4300A-3IMS8#PBF

P1-P3P4-P6P7-P9P10-P12P13-P14
LTC4300A-3
1
4300a3fa
Typical applicaTion
FeaTures DescripTion
Level-Shifting
Hot Swappable 2-Wire
Bus Buffer with Enable
The LT C
®
4300A-3 hot swappable 2-wire bus buffer allows
I/O card insertion into a live backplane without corruption
of the data and clock busses. When the connection is made,
the LTC4300A-3 provides bidirectional buffering, keeping
the backplane and card capacitances isolated. Rise time
accelerator circuitry allows the use of weaker DC pull-up
currents while still meeting rise time requirements. During
insertion, the SDA and SCL lines are precharged to 1V to
minimize bus disturbances.
The LTC4300A-3 provides level translation between
3.3V and 5V supplies. The backplane and card can both
be powered with supplies ranging from 2.7V to 5.5V.
The LTC4300A-3 also incorporates a CMOS threshold
ENABLE pin which forces the part into a low current mode
and isolates the card from the backplane. When driven to
V
CC
, the ENABLE pin sets normal operation.
The LTC4300A-3 is available in the MSOP and 3mm × 3mm
DFN packages.
Input–Output Connection
applicaTions
n
Bidirectional Buffer* for SDA and SCL Lines
Increases Fanout
n
Prevents SDA and SCL Corruption During Live
Board Insertion and Removal From Backplane
n
Logic Threshold ENABLE Input
n
Isolates Input SDA and SCL Lines From Output
n
Compatible with I
2
C, I
2
C Fast Mode and SMBus
Standards (Up to 400kHz Operation)
n
1V Precharge on all SDA and SCL Lines
n
Supports Clock Stretching, Arbitration and
Synchronization
■
5V to 3.3V Level Translation
■
High Impedance SDA, SCL Pins for V
CC
= 0V,
V
CC2
= 0V
■
Small 8-Lead DFN and MSOP Packages
n
Hot Board Insertion
n
Servers
n
Capacitance Buffer/Bus Extender
n
Desktop Computer
L, LT , LT C , LT M , Linear Technology and the Linear logo are registered trademarks and
Hot Swap and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners. *Patent pending.
V
CC
3.3V
10k10k
ENABLE
SCLIN SCLOUT
SDAIN SDAOUT
5
4
6 7
3 2
8 1
GND
LTC4300A-3
0.01µF
0.01µF
V
CC2
4300a3 TA01
10k 10k
OFF ON
200ns/DIV
OUTPUT
SIDE
50pF
0.5V/DIV
4300a3 TA01b
INPUT
SIDE
150pF
LTC4300A-3
2
4300a3fa
pin conFiguraTion
absoluTe MaxiMuM raTings
V
CC
to GND ..................................................–0.3V to 7V
V
CC2
to GND ................................................. –0.3V to 7V
SDAIN, SCLIN, SDAOUT, SCLOUT ................ –0.3V to 7V
ENABLE ........................................................ –0.3V to 7V
Operating Temperature Range
LTC4300A-3C ......................................... 0°C to 70°C
LTC4300A-3I........................................–40°C to 85°C
(Note 1)
orDer inForMaTion
TOP VIEW
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
5
6
7
8
9
4
3
2
1V
CC2
SCLOUT
SCLIN
GND
V
CC
SDAOUT
SDAIN
ENABLE
T
JMAX
= 125°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 9), PCB CONNECTION IS OPTIONAL
1
2
3
4
V
CC2
SCLOUT
SCLIN
GND
8
7
6
5
V
CC
SDAOUT
SDAIN
ENABLE
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 200°C/W
Storage Temperature Range
MSOP ................................................ –65°C to 150°C
DFN .................................................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec)
MSOP Only ....................................................... 300°C
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4300A-3CDD#PBF LTC4300A-3CDD#TRPBF LBHG
8-Lead (3mm × 3mm) Plastic DFN
0°C to 70°C
LTC4300A-3IDD#PBF LTC4300A-3IDD#TRPBF LBHG
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LTC4300A-3CMS8#PBF LTC4300A-3CMS8#TRPBF LTBHD 8-Lead Plastic MSOP 0°C to 70°C
LTC4300A-3IMS8#PBF LLTC4300A-3IMS8#TRPBF LTBHF 8-Lead Plastic MSOP –40°C to 85°C
Consult LT C 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: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
LTC4300A-3
3
4300a3fa
elecTrical characTerisTics
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply
V
CC
Positive Supply Voltage
l
2.7 5.5 V
V
CC2
Card Side Supply Voltage
l
2.7 5.5 V
I
SD
Supply Current in Shutdown Mode V
ENABLE
= 0V 20 µA
I
VCC1
V
CC
Supply Current V
SDAIN
= V
SCLIN
= 0V, V
CC1
= V
CC2
= 5.5V 3 4.1 mA
I
VCC2
V
CC2
Supply Current V
SDAOUT
= V
SCLOUT
= 0V, V
CC1
= V
CC2
= 5.5V 2.1 2.9 mA
Start-Up Circuitry
V
PRE
Precharge Voltage SDA, SCL Floating
l
0.8 1.0 1.2 V
t
IDLE
Bus Idle Time
l
50 95 150 µs
V
EN
ENABLE Threshold Voltage 0.5 • V
CC
0.9 • V
CC
V
V
DIS
Disable Threshold Voltage ENABLE Pin 0.1 • V
CC
0.5 • V
CC
V
I
EN
ENABLE Input Current ENABLE from 0V to V
CC
±0.1 ±1 µA
t
PHL
ENABLE Delay, On-Off 10 ns
t
PLH
ENABLE Delay, Off-On 95 µs
Rise Time Accelerators
I
PULLUPAC
Transient Boosted Pull-Up Current Positive Transition on SDA, SCL, V
CC
= 2.7V,
V
CC2
= 2.7V, Slew Rate = 1.25V/µs (Note 2)
1 2 mA
Input-Output Connection
V
OS
Input-Output Offset Voltage 10k to V
CC
on SDA, SCL, V
CC
= 3.3V (Note 3),
V
CC2
= 3.3V, V
IN
= 0.2V
l
0 100 175 mV
f
SCL, SDA
Operating Frequency Guaranteed by Design, Not Subject to Test 0 400 kHz
C
IN
Digital Input Capacitance Guaranteed by Design, Not Subject to Test 10 pF
V
OL
Output Low Voltage, Input = 0V SDA, SCL Pins, I
SINK
= 3mA, V
CC
= 2.7V,
V
CC2
= 2.7V
l
0 0.4 V
I
LEAK
Input Leakage Current SDA, SCL Pins = V
CC
= 5.5V, V
CC2
= 5.5V ±5 µA
Timing Characteristics
f
I2C
I
2
C Operating Frequency (Note 4) 0 400 kHz
t
BUF
Bus Free Time Between Stop and
Start Condition
(Note 4) 1.3 µs
t
hD,STA
Hold Time After (Repeated) Start
Condition
(Note 4) 0.6 µs
t
su,STA
Repeated Start Condition Setup Time (Note 4) 0.6 µs
t
su,STO
Stop Condition Setup Time (Note 4) 0.6 µs
t
hD, DAT
Data Hold Time (Note 4) 300 ns
t
su, DAT
Data Setup Time (Note 4) 100 ns
t
LOW
Clock Low Period (Note 4) 1.3 µs
t
HIGH
Clock High Period (Note 4) 0.6 µs
t
f
Clock, Data Fall Time (Notes 4, 5) 20 + 0.1 • C
B
300 ns
t
r
Clock, Data Rise Time (Notes 4, 5) 20 + 0.1 • C
B
300 ns
t
PHL,SKEW
High-to-Low Propagation Delay
Skew, SCL-SDA
V
CC
= 2.7V, V
CC2
= 5.5V;
V
CC
= 5.5V, V
CC2
= 2.7V (Note 6)
l
0 ±75 ns
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 2.7V to 5.5V, V
CC2
= 2.7V to 5.5V, unless otherwise noted.
P1-P3P4-P6P7-P9P10-P12P13-P14

LTC4300A-3IMS8#PBF

Mfr. #:
Buy LTC4300A-3IMS8#PBF
Manufacturer:
Analog Devices Inc.
Description:
Interface - Signal Buffers, Repeaters 2-Wire Bus Buffer
Lifecycle:
New from this manufacturer.
Delivery:
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