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IIC驱动芯片 LTC43031MS8 手册
资料介绍
ltc43031ms8,IIC驱动芯片,用于隔离内部MCU的IIC模块与外部的IIC模块进行通讯
部分文件列表
文件名 | 大小 |
C117202_LTC4303IMS8%23PBF_2017-07-12.PDF | 550K |
部分页面预览
(完整内容请下载后查看)LTC4303
Hot Swappable 2-Wire
Bus Buffer with Stuck
Bus Recovery
U
FEATURES
DESCRIPTIO
The LTC®4303 hot swappable 2-wire Bus Buffer allows I/O
card insertion into a live backplane without corruption of
the data and clock busses. When a connection is made,
the LTC4303 provides bidirectional buffering, keeping the
backplane and card capacitances isolated. If SDAOUT or
SCLOUTislowfor≥30ms(typ),theLTC4303automatically
breaks the data and clock bus connection. At this time the
LTC4303automaticallygeneratesupto16clockpulseson
SCLOUT in an attempt to free the bus. A connection will
be enabled automatically when the bus becomes free.
■
Automatic Disconnect of SDA/SCL Lines when Bus
is Stuck Low for ≥ 30ms
■
Recovers Stuck Busses with Automatic Clocking*
■
Bidirectional Buffer* for SDA and SCL Lines
Increases Fanout
■
Prevents SDA and SCL Corruption During Live
Board Insertion and Removal from Backplane
■
Pin Compatible with LTC4300A-1
■
1ꢀkꢁ ꢂuman Bodꢃ ꢄodel ꢅSD Protection
■
Isolates Input SDA and SCL Lines from Output
2
2
Compatible with I CTM, I C Fast-Mode and SMBus
Standards (Up to 400kHz Operation)
READY Open Drain Output
■
Rise-timeacceleratorcircuitryallowstheuseoflargerpull-
up resistance while still meeting rise-time requirements.
During insertion, the SDA and SCL lines are precharged
to 1V to minimize bus disturbances. When driven high,
ENABLE allows the LTC4303 to connect after a stop bit or
busidleoccurs.DrivingENABLElowbreakstheconnection
betweenSDAINandSDAOUT,SCLINandSCLOUT.READY
is an open drain output that indicates when the backplane
and card sides are connected together.
■
■
■
■
■
1V Precharge on All SDA and SCL Lines
High Impedance SDA, SCL Pins for V = 0V
CC
ENABLE Gates Connection from Input to Output
MSOP 8-Pin andUDFN (3mm × 3mm) Packages
APPLICATIO S
■
Hot Board Insertion
■
, 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 6356140, 6650174, 7032051.
Servers
■
Capacitance Buffer/Bus Extender
■
RAID Systems
U
TYPICAL APPLICATIO
Stuck Bus Resolved
with Automatic Clocking
5V 3.3V
0.01
F
10k 10k
V
CC
10k 10k
LTC4303
SDAOUT
5V/DIV
SCLIN
SCLOUT
BACK_SCL
CARD_SCL
CARD_SDA
SDAIN
5V/DIV
SDAIN
SDAOUT
READY
BACK_SDA
3.3V
SCLOUT
5V/DIV
ENABLE
GND
100k
4303 TA01
4303 TA01b
200 s/DIV
BACKPLANE
CONNECTOR CONNECTOR
CARD
STAGGERED
4303fb
1
LTC4303
W W U W
(Notes 1, 2)
ABSOLUTE AXI U RATI GS
SDAIN, SCLIN, SDAOUT, SCLOUT, READY
(Note 3)..................................................................30mA
Storage Temperature Range
V
to GND ..................................................–0.3V to 7V
CC
SDAIN, SCLIN, SDAOUT, SCLOUT,
READY, ENABLE...........................................–0.3V to 7V
Operating Temperature
MSOP ................................................–65°C to 150°C
DFN....................................................–65°C to 125°C
Lead Temperature (Soldering, 10sec)
LTC4303C ................................................ 0°C to 70°C
LTC4303I .............................................–40°C to 85°C
MSOP ............................................................... 300°C
U
W
U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ENABLE
SCLOUT
SCLIN
GND
1
2
3
4
8
7
6
5
V
CC
TOP VIEW
SDAOUT
SDAIN
9
ENABLE
SCLOUT
SCLIN
GND
1
2
3
4
8 V
CC
7 SDAOUT
6 SDAIN
5 READY
READY
MS8 PACKAGE
8-LEAD PLASTIC MSOP
= 125°C, θ = 200°C/W
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
T
JMAX
JA
T
JMAX
= 125°C, θ = 43°C/W
JA
EXPOSED PAD (PIN 9)
PCB CONNECTION OPTIONAL
ORDER PART NUMBER
DD PART MARKING*
LBPZ
ORDER PART NUMBER
MS8 PART MARKING*
LTBPY
LTC4303CDD
LTC4303IDD
LTC4303CMS8
LTC4303IMS8
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
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 applꢃ over the full operating
temperature range, otherwise specifications are at T = 2ꢀ°C. ꢁ = 2.7ꢁ to ꢀ.ꢀꢁ, unless otherwise noted.
A
CC
SYꢄBOL
PARAꢄꢅTꢅR
CONDITIONS
ꢄIN
TYP
ꢄAX
UNITS
Power Supplꢃ
V
Positive Supply Voltage
●
●
2.7
5.5
8
V
CC
I
CC
Supply Current
Supply Current, ENABLE = GND
V
V
= 5.5V, V
= 5.5V
= V = 0V (Note 7)
SDAOUT
6
1.5
mA
mA
CC
CC
SDAIN
Startup Circuitrꢃ
V
Precharge Voltage
Bus Idle Time
SDA, SCL Floating, V = 5.5V
●
●
0.8
60
1
1.2
V
PRE
CC
T
IDLE
95
175
µs
V
READY Output Low Voltage
I
I
= 3mA
= 6mA, V = 4.7V
●
●
0.4
0.4
V
V
OL_READY
PULLUP
PULLUP
CC
V
ENABLE Threshold
●
●
●
0.8
1.6
1.4
0.1
1.8
2
V
µA
V
THR_ENABLE
ENABLE
I
ENABLE Input Current
ENABLE from 0 to V
1.5
2
CC
V
THR
SDA, SCL Logic Input Threshold Voltage Rising Edge
4303fb
2
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