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參數(shù)資料
| 型號(hào)： | LTC4300A-3IDD |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Level Shifting Hot Swappable 2-Wire Bus Buffer with Enable |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 3 X 3 MM, PLASTIC, MO-229-WEED, DFN-8 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 198K |
| 代理商： | LTC4300A-3IDD |
LTC4300A-3
9
sn4300a3 4300a3fs
Resistor Pull-Up Value Selection
The system pull-up resistors must be strong enough to
provide a positive slew rate of 1.25V/
μ
s 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
≤
(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
≤
16k for V
CC
= 5.5V maximum, R
≤
24k for
V
CC
= 3.6V 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.
APPLICATIU
W
U
U
Live Insertion and Capacitance Buffering Application
Figures 3 and 4 illustrate the usage of the LTC4300A-3 in
applications that take advantage of both its Hot Swap con-
trolling and capacitance buffering features. In all of these
applications, note that if the I/O cards were plugged di-
rectly into the backplane, all of the backplane and card ca-
pacitances would add directly together, making rise- and
fall-time requirements difficult to meet. Placing a
LTC4300A-3 on the edge of each card, however, isolates
the card capacitance from the backplane. For a given I/O
card, the LTC4300A-3 drives the capacitance of everything
on the card and the backplane must drive only the capaci-
tance of the LTC4300A-3, which is less than 10pF.
V
CC
SDAIN
SCLIN
V
CC2
GND
SDAOUT
SCLOUT
ENABLE
4300A-3 F03
R2
10k
R3
10k
R1
10k
R4
10k
R5
10k
R6
10k
I/O PERIPHERAL CARD 1
LTC4300A-3
C2 0.01
μ
F
CARD_SCL
CARD_SDA
R7
10k
R8
10k
V
CC2
BACKPLANE
BACKPLANE
CONNECTOR
SDA
SCL
ENA2
ENA1
V
CC
C1
0.01
μ
F
V
CC
SDAIN
SCLIN
V
CC2
GND
SDAOUT
SCLOUT
ENABLE
I/O PERIPHERAL CARD 2
LTC4300A-3
C4 0.01
μ
F
CARD2_SCL
CARD2_SDA
C3
0.01
μ
F
Figure 3. The LTC4300A-3 in a PCI Application Where All the Pins Have the Same Length.
ENABLE Should be Held Low Until All Transients Associated with the Live Insertion Have Settled
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| LTC4300A-3IDD#PBF | 功能描述:IC BUFFER BUS HOTSWAP 2WR 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開(kāi)關(guān):無(wú) 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁(yè)面:1423 (CN2011-ZH PDF) |
| LTC4300A-3IDD#TR | 功能描述:IC BUFFER BUS HOTSWAP 2WR 8DFN RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開(kāi)關(guān):無(wú) 電流限制:可調(diào) 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(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LTC4300A-3IDD#TRPBF | 功能描述:IC BUFFER BUS HOTSWAP 2WR 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開(kāi)關(guān):無(wú) 電流限制:可調(diào) 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(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
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| LTC4300A-3IMS8#PBF | 功能描述:IC BUFFER BUS 2WR HOTSWAP 8-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開(kāi)關(guān):無(wú) 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁(yè)面:1423 (CN2011-ZH PDF) |
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