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| 型號(hào)： | LTC4310IDD-2#PBF |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 7/20頁(yè) |
| 文件大小： | 0K |
| 描述： | IC I2C ISOLATOR SMBUS 10DFN |
| 產(chǎn)品培訓(xùn)模塊： | LTC4310 - Hot-Swappable I²C Isolators |
| 標(biāo)準(zhǔn)包裝： | 121 |
| 類型： | 熱交換 I²C 隔離器 |
| Tx/Rx類型： | I²C Logic |
| 電容 - 輸入： | 10pF |
| 電源電壓： | 3 V ~ 5.5 V |
| 電流 - 電源： | 7mA |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 10-DFN（3x3） |
| 包裝： | 管件 |
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LTC4310-1/LTC4310-2
15
431012fa
applicaTions inForMaTion
Figure 10. The LTC4310-1 in an I2C Hot-Swapping Application
5V
BACKPLANE
CONNECTOR
BACKPLANE
CARD
CONNECTOR
R1
2k
R2
2k
R3
10k
I/O PERIPHERAL CARD
431012 F10
C7
0.01F
R5
6.8k
R6
10k
R7
100k
GND
RXP
RXN
TXP
TXN
LTC4310-1
VCC
READY
EN
SDA
SCL
READY
EN
SDA
SCL
READY2
EN2
SDA2
3.3V
SCL2
R4
6.8k
C6
0.01F
GND
TXP
TXN
RXP
RXN
LTC4310-1
VCC
READY
EN
SDA
SCL
C1
C3
C2
C4
C5
C1 TO C5 = 47pF, 100V
CBUS = 50pF
CBUS = 400pF
Figure10showstheLTC4310-1inatwo-wirebusHotSwap
application. Using a staggered connector, make EN the
shortestlengthpintoensurethatthetransientsassociated
with hot swapping have settled before the LTC4310-1 can
be enabled. After connection is complete, a master on the
backplane may drive EN high to bring the LTC4310-1 out
of shutdown mode and into normal operation. Due to its
STOP bit and bus idle detection circuitry, the LTC4310-1’s
driver circuitry is not activated until transactions on both
buses are complete.
LTC4310 Compatibility with Other LTC Bus Buffers
The LTC4310 cannot be used on the same I2C bus with the
LTC4300A-1, LTC4303 or LTC4307. During rising edges,
the rise time accelerators of these buffers turn on before
the LTC4310 disables its rise rate regulation circuitry,
resulting in nonmonotonic bus edges.
The LTC4310-1 is compatible with the LTC4301 and
LTC4301L.ItisalsocompatiblewiththeLTC4302,LTC4304,
LTC4305andLTC4306,providedthattherisetimeaccelera-
tors of these buffers are permanently disabled. All of the
previously mentioned buffers are incompatible with the
LTC4310-2 because the compensation networks of these
buffers cause the bus to rise more slowly than (0.35
VCC)/300ns, therefore the LTC4310-2 would not be able
to control the bus rise rate.
LTC4310-1 Compatibility with LTC4310-2
In a typical application such as shown in Figure 1, an
LTC4310-1 can be used on one bus and an LTC4310-2 can
be used on the other, provided that the bus pull-up resis-
tors connected to the LTC4310-1 meet the requirements
of Figure 2, and the bus pull-up resistors connected to the
LTC4310-2 meet the requirements of Figure 3. However,
the bus switching frequency is limited by the rise rate
regulationcircuitryoftheLTC4310-1.Inaddition,significant
skew is introduced on the rising edges due to the large
difference in the controlled rise rates of the two buses. For
this reason, it is recommended to use two LTC4310-1’s
in SMBus and standard mode I2C applications and to use
two LTC4310-2’s in fast mode I2C applications.
The LTC4310-1 cannot be used on the same physical I2C
bus with the LTC4310-2, because the LTC4310-1’s rise
rate regulation circuitry controls the bus rise rate to (0.35
VCC)/900ns, therefore the LTC4310-2 would not be able
to control the bus rise rate.
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