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參數資料
| 型號： | LTC4300-1IMS8#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數： | 10/18頁 |
| 文件大小： | 735K |
| 描述： | IC HOTSWAP 2WIRE BUS BUFFR 8MSOP |
| 標準包裝： | 2,500 |
| 類型： | 熱交換開關 |
| 應用： | 通用型緩沖器/總線擴展器 |
| 內部開關： | 是 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 8-MSOP |
| 包裝： | 帶卷 (TR) |
TC4300-1/LTC4300-2
10
430012fb
For more information www.linear.com/LTC4300-1
Resistor Pull-Up Value Selection
The system pull-up resistors must be strong enough to
provide a positive slew rate of 1.25V/祍 on the SDA and
SCL pins, in order to activate the boost pull-up currents
during rising edges. Choose maximum resistor value R
using the formula:
R d (V
CC(MIN)
0.6) (800,000) / C
where R is the pull-up resistor value in ohms, V
CC(MIN)
is the minimum V
CC
voltage and C is the equivalent bus
capacitance in picofarads (pF).
In addition, regardless of the bus capacitance, always
choose R d 16k for V
CC
= 5.5V maximum, R d 24k for
V
CC
??.6V maximum. The start-up circuitry requires logic
high voltages on SDAOUT and SCLOUT to connect the
backplane to the card, and these pull-up values are needed
to overcome the precharge voltage. See the curves in
Figures 3 and 4 for guidance in resistor pull-up selection.
Minimum SDA and SCL Capacitance Requirements
The LTC4300 I/O connection circuitry requires a minimum
capacitance loading on the SDA and SCL pins in order to
function properly. The value of this capacitance is a func-
tion of V
CC
and the bus pull-up resistance. Estimate the
bus capacitance on both the backplane and the card data
and clock busses, and refer to Figures 3 and 4 to choose
appropriate pull-up resistor values. Note from the figures
applicaTions inFormaTion
that 5V systems must have at least 47pF capacitance on
their busses and 3.3V systems must have at least 22pF
capacitance for proper operation of the LTC4300. For ap-
plications with less capacitance, add a capacitor to ground
to ensure these minimum capacitance conditions.
Hot Swapping and Capacitance Buffering Application
Figures 5 through 8 illustrate the usage of the LTC4300 in
applications that take advantage of both its hot swapping
and capacitance buffering features. In all of these applica-
tions, note that if the I/O cards were plugged directly into
the backplane, all of the backplane and card capacitances
would add directly together, making rise and fall time
requirements difficult to meet. Placing a LTC4300 on the
edge of each card, however, isolates the card capacitance
from the backplane. For a given I/O card, the LTC4300
drives the capacitance of everything on the card and the
backplane must drive only the capacitance of the LTC4300,
which is less than 10pF.
Figure 5 shows the LTC4300-1 in a CompactPCI configura-
tion. Connect V
CC
to the output of one of the CompactPCI
power supply Hot Swap circuits and connect ENABLE
to the short board ENABLE pin. V
CC
is monitored by
a filtered UVLO circuit. With the V
CC
voltage powering
up after all other pins have established connection, the
UVLO circuit ensures that the backplane and card data
and clock busses are not connected until the transients
Figure 3. Bus Requirements for 3.3V Systems
Figure 4. Bus Requirements for 5V Systems
C
BUS
(pF)
0
430012 F03
30
25
20
15
10
5
0
100
200
300
400
R
MAX
= 24k
RISE TIME > 300ns
RECOMMENDED
PULL-UP
C
BUS
(pF)
0
0
0
5
10
15
20
100
200
300
400
RISE TIME
> 300ns
RECOMMENDED
PULL-UP
R
MAX
= 16k
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相關代理商/技術參數 |
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| LTC4300-2CMS8 | 功能描述:IC HOT SWAP 2WIRE BUS BUFR MSOP8 RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標準包裝:50 系列:- 類型:熱交換控制器 應用:-48V 遠程電力系統，AdvancedTCA ? 系統，高可用性 內部開關:無 電流限制:可調 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:10-MSOP 包裝:管件 |
| LTC4300-2CMS8#PBF | 功能描述:IC HOTSWAP 2WIRE BUS BUFFR 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標準包裝:50 系列:- 類型:熱交換控制器 應用:-48V 遠程電力系統，AdvancedTCA ? 系統，高可用性 內部開關:無 電流限制:可調 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:10-MSOP 包裝:管件 |
| LTC4300-2CMS8#TR | 功能描述:IC BUFFER BUS HOTSWAP 2WR 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標準包裝:50 系列:- 類型:熱交換控制器 應用:-48V 遠程電力系統，AdvancedTCA ? 系統，高可用性 內部開關:無 電流限制:可調 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:10-MSOP 包裝:管件 |
| LTC4300-2CMS8#TRPBF | 功能描述:IC HOTSWAP 2WIRE BUS BUFFR 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標準包裝:50 系列:- 類型:熱交換控制器 應用:-48V 遠程電力系統，AdvancedTCA ? 系統，高可用性 內部開關:無 電流限制:可調 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:10-MSOP 包裝:管件 |
| LTC4300-2IMS8 | 功能描述:IC BUFFER BUS HOTSWAP 2WR 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標準包裝:50 系列:- 類型:熱交換控制器 應用:-48V 遠程電力系統，AdvancedTCA ? 系統，高可用性 內部開關:無 電流限制:可調 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:10-MSOP 包裝:管件 |
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