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LTC4300A-2CMS8#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC4300A-1/LTC4300A-2
1
4300a12fa
TYPICAL APPLICATION
FEATURES DESCRIPTION
Hot Swappable
2-Wire Bus Buffers
The LTC
®
4300A series hot swappable 2-wire bus buffers
allow I/O card insertion into a live backplane without corrup-
tion of the data and clock busses. When the connection is
made, the LTC4300A-1/LTC4300A-2 provide 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-1 incorporates a CMOS threshold digital
ENABLE input pin, which forces the part into a low current
mode when driven to ground and sets normal operation
when driven to V
CC
. It also includes an open drain READY
output pin, which indicates that the backplane and card
sides are connected together. The LTC4300A-2 replaces
the ENABLE pin with a dedicated supply voltage pin, V
CC2
,
for the card side, providing level shifting between 3.3V
and 5V systems. Both the backplane and card may be
powered with supply voltages ranging from 2.7V to 5.5V,
with no constraints on which supply voltage is higher. The
LTC4300A-2 also replaces the READY pin with a digital
CMOS input pin, ACC, which enables and disables the
rise-time accelerator currents.
The LTC4300A is available in a small 8-pin MSOP package.
Input–Output Connection t
PLH
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
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
Low I
CC
Chip Disable: <1μA (LTC4300A-1)
n
READY Open Drain Output (LTC4300A-1)
n
1V Precharge on all SDA and SCL Lines
n
Supports Clock Stretching, Arbitration and
Synchronization
n
5V to 3.3V Level Translation (LTC4300A-2)
n
High Impedance SDA, SCL Pins for V
CC
= 0V
n
Small MSOP 8-Pin Package
n
Hot Board Insertion
n
Servers
n
Capacitance Buffer/Bus Extender
n
Desktop Computer
L, LT, LTC, LTM, 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. *Protected by U.S. Patents, including 6650174.
R1
10k
V
CC
3.3V
R2
10k
ENABLE
SCLIN SCLOUT
SDAIN SDAOUT
GND
LTC4300A-1
READY
C1
0.01μF
4300a12 TA01
R3
10k
R4
10k
OUTPUT
SIDE
50pF
INPUT
SIDE
150pF
4300a12 TA02
LTC4300A-1/LTC4300A-2
2
4300a12fa
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply
V
CC
Positive Supply Voltage
l
2.7 5.5 V
I
CC
Supply Current V
CC
= 5.5V, V
SDAIN
= V
SCLIN
= 0V, LTC4300A-1
l
5.1 7 mA
I
SD
Supply Current in Shutdown Mode V
ENABLE
= 0V, LTC4300A-1 0.1 μA
V
CC2
Card Side Supply Voltage LTC4300A-2
l
2.7 5.5 V
I
VCC1
V
CC
Supply Current V
SDAIN
= V
SCLIN
= 0V, V
CC1
= V
CC2
= 5.5V,
LTC4300A-2
3 4.1 mA
I
VCC2
V
CC2
Supply Current V
SDAOUT
= V
SCLOUT
= 0V, V
CC1
= V
CC2
= 5.5V,
LTC4300A-2
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 LTC4300A-1 0.5 • V
CC
0.9 • V
CC
V
V
DIS
Disable Threshold Voltage LTC4300A-1, ENABLE Pin 0.1 • V
CC
0.5 • V
CC
V
I
EN
ENABLE Input Current ENABLE from 0V to V
CC
, LTC4300A-1 ±0.1 ±1 μA
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, unless otherwise noted.
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
V
CC
to GND .................................................... –0.3 to 7V
V
CC2
to GND (LTC4300A-2)............................ –0.3 to 7V
SDAIN, SCLIN, SDAOUT, SCLOUT .................. –0.3 to 7V
READY, ENABLE (LTC4300A-1) ...................... –0.3 to 7V
ACC (LTC4300A-2) ......................................... –0.3 to 7V
Operating Temperature Range
LTC4300A-1C/LTC4300A-2C .................... 0°C to 70°C
LTC4300A-1I/LTC4300A-2I ..................–40°C to 85°C
Storage Temperature Range .................. –65°C to 125°C
Lead Temperature (Soldering, 10 sec) ................... 300°C
(Note 1)
1
2
3
4
ENABLE/V
CC2
*
SCLOUT
SCLIN
GND
8
7
6
5
V
CC
SDAOUT
SDAIN
READY/ACC*
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
*LTC4300A-2
T
JMAX
= 125°C, θ
JA
= 200°C/W
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4300A-1CMS8#PBF LTC4300A-1CMS8#TRPBF LTABF 8-Lead Plastic MSOP 0°C to 70°C
LTC4300A-1IMS8#PBF LTC4300A-1IMS8#TRPBF LTABG 8-Lead Plastic MSOP –40°C to 85°C
LTC4300A-2CMS8#PBF LTC4300A-2CMS8#TRPBF LTACF 8-Lead Plastic MSOP 0°C to 70°C
LTC4300A-2IMS8#PBF LTC4300A-2IMS8#TRPBF LTACG 8-Lead Plastic MSOP –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on nonstandard lead based finish parts.
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-1/LTC4300A-2
3
4300a12fa
ELECTRICAL CHARACTERISTICS
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, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
PHL
ENABLE Delay, On-Off LTC4300A-1 10 ns
READY Delay, Off-On LTC4300A-1 10 ns
t
PLH
ENABLE Delay, Off-On LTC4300A-1 95 μs
READY Delay, On-Off LTC4300A-1 10 ns
I
OFF
READY OFF State Leakage Current LTC4300A-1 ±0.1 μA
V
OL
READY Output Low Voltage I
PULLUP
= 3mA, LTC4300A-1
l
0.4 V
Rise-Time Accelerators
I
PULLUPAC
Transient Boosted Pull-Up Current Positive Transition on SDA,SCL, V
CC
= 2.7V,
Slew Rate = 1.25V/μs (Note 2),
LTC4300A-2, ACC = 0.7 • V
CC2
, V
CC2
= 2.7V
12 mA
V
ACCDIS
Accelerator Disable Threshold LTC4300A-2 0.3 • V
CC2
0.5 • V
CC2
V
V
ACCEN
Accelerator Enable Threshold LTC4300A-2 0.5 • V
CC2
0.7 • V
CC2
V
I
VACC
ACC Input Current LTC4300A-2 ± 0.1 ±1 μA
t
PDOFF
ACC Delay, On/Off LTC4300A-2 5 ns
Input-Output Connection
V
OS
Input-Output Offset Voltage 10k to V
CC
on SDA, SCL, V
CC
= 3.3V (Note 3),
LTC4300A-2, 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, LTC4300A-2
l
0 0.4 V
I
LEAK
Input Leakage Current SDA, SCL Pins = V
CC
= 5.5V,
LTC4300A-2, 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
LTC4300A-1: V
CC
= 2.7V; V
CC
= 5.5V (Note 6)
l
0 ±75 ns
LTC4300A-2: V
CC
= 2.7V, V
CC2
= 5.5V;
V
CC
= 5.5V; V
CC2
= 2.7V (Note 6)
l
0 ±75 ns
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC4300A-2CMS8#PBF

Mfr. #:
Buy LTC4300A-2CMS8#PBF
Manufacturer:
Analog Devices Inc.
Description:
Interface - Signal Buffers, Repeaters 2-Wire Bus Buffer
Lifecycle:
New from this manufacturer.
Delivery:
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