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| 型号： | LTC4313CMS8-2#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/20页 |
| 文件大小： | 0K |
| 描述： | IC 2WIRE BUS BUFFER 8MSOP |
| 标准包装： | 2,500 |
| 类型： | 2线总线缓冲器 |
| Tx/Rx类型： | I²C Logic |
| 电容 - 输入： | 10pF |
| 电源电压： | 2.9 V ~ 5.5 V |
| 电流 - 电源： | 8.1mA |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
LTC4313-1/LTC4313-2/
LTC4313-3
11
4313123f
applicaTions inForMaTion
Live Insertion and Capacitance Buffering Application
Figure5illustratesanapplicationoftheLTC4313thattakes
advantage of the LTC4313’s Hot Swap, capacitance buffer-
ing and precharge features. If the I/O cards were plugged
directly into the backplane without LTC4313 buffers, all of
the backplane and card capacitances would directly add
together, making rise time requirements difficult to meet.
Placing an LTC4313 on the edge of each card isolates the
card capacitance from the backplane. For a given I/O card,
the LTC4313 drives the capacitance of everything on the
card and the devices on backplane must drive only the
small capacitance of the LTC4313 which is < 10pF.
In Figure 5 a staggered connector is used to connect the
LTC4313 to the backplane. VCC and GND are the longest
pins to ensure that the LTC4313 is powered and forcing
a 1V precharge voltage on the medium length SDA and
SCL pins before they contact the backplane. The 1V pre-
charge voltage is applied to the SDA and SCL pins through
200k resistors. Since cards are being plugged into a live
backplane whose SDA and SCL busses could be at any
voltage between 0 and VCC, precharging the LTC4313’s
SDA and SCL pins to 1V minimizes disturbances to the
backplane bus when cards are being plugged in. The low
(<10pF)inputcapacitanceoftheLTC4313alsocontributes
to minimizing bus disturbance as cards are being plugged
in. With ENABLE being the shortest pin and also pulled to
GND by a resistor, the staggered approach provides ad-
ditional time for transients associated with live insertion to
settle before the LTC4313 can be enabled. A 10k or lower
pull-downresistorfromENABLEtoGNDisrecommended.
If a connector is used where all pins are of equal length,
the benefit of the precharge circuit is lost. Also, the
ENABLE signal to the LTC4313 must be held low until all
the transients associated with card insertion into a live
system die out.
Level Translating to Voltages < 2.9V (LTC4313-3 Only)
The LTC4313-3 can be used for level translation to bus
voltages below 2.9V. Since the maximum buffer turn-on
and turn-off voltages are 0.36VCC, the minimum bus
supply voltage is determined by the following equation,
VDD,BUS(MIN) ≥
0.36 VCC
0.7
(4)
in order to meet the VIH = 0.7 VDD,BUS requirement and
not impact the high side noise margin. Users willing to live
with a lower logic high noise margin can level translate
down to 1.4V. An example of voltage level translation from
3.3V to 1.8V is illustrated in Figure 6, where a 3.3V input
voltage bus is translated to a 1.8V output voltage bus.
Tying VCC to 3.3V satisfies Equation 4. A similar voltage
translation can also be performed going from a 3.3V bus
supply on the output side to a 1.8V input if the VCC pin of
the LTC4313-3 is tied to the 3.3V output supply.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4313CMS8-3#PBF | 功能描述:IC 2WIRE BUS BUFFER 8MSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 信号缓冲器，中继器，分配器 系列:- 标准包装:160 系列:- 类型:转发器 Tx/Rx类型:以太网 延迟时间:- 电容 - 输入:- 电源电压:2.37 V ~ 2.63 V 电流 - 电源:60mA 安装类型:表面贴装 封装/外壳:64-TQFP 裸露焊盘 供应商设备封装:64-TQFP-EP（10x10） 包装:托盘 其它名称:Q5134101 |
| LTC4313CMS8-3#TRPBF | 功能描述:IC 2WIRE BUS BUFFER 8MSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 信号缓冲器，中继器，分配器 系列:- 标准包装:160 系列:- 类型:转发器 Tx/Rx类型:以太网 延迟时间:- 电容 - 输入:- 电源电压:2.37 V ~ 2.63 V 电流 - 电源:60mA 安装类型:表面贴装 封装/外壳:64-TQFP 裸露焊盘 供应商设备封装:64-TQFP-EP（10x10） 包装:托盘 其它名称:Q5134101 |
| LTC4313IDD-1#PBF | 功能描述:IC 2WIRE BUS BUFFER 8DFN RoHS:是 类别:集成电路 (IC) >> 接口 - 信号缓冲器，中继器，分配器 系列:- 标准包装:160 系列:- 类型:转发器 Tx/Rx类型:以太网 延迟时间:- 电容 - 输入:- 电源电压:2.37 V ~ 2.63 V 电流 - 电源:60mA 安装类型:表面贴装 封装/外壳:64-TQFP 裸露焊盘 供应商设备封装:64-TQFP-EP（10x10） 包装:托盘 其它名称:Q5134101 |
| LTC4313IDD-1#TRPBF | 功能描述:IC 2WIRE BUS BUFFER 8DFN RoHS:是 类别:集成电路 (IC) >> 接口 - 信号缓冲器，中继器，分配器 系列:- 标准包装:160 系列:- 类型:转发器 Tx/Rx类型:以太网 延迟时间:- 电容 - 输入:- 电源电压:2.37 V ~ 2.63 V 电流 - 电源:60mA 安装类型:表面贴装 封装/外壳:64-TQFP 裸露焊盘 供应商设备封装:64-TQFP-EP（10x10） 包装:托盘 其它名称:Q5134101 |
| LTC4313IDD-2#PBF | 功能描述:IC 2WIRE BUS BUFFER 8DFN RoHS:是 类别:集成电路 (IC) >> 接口 - 信号缓冲器，中继器，分配器 系列:- 标准包装:160 系列:- 类型:转发器 Tx/Rx类型:以太网 延迟时间:- 电容 - 输入:- 电源电压:2.37 V ~ 2.63 V 电流 - 电源:60mA 安装类型:表面贴装 封装/外壳:64-TQFP 裸露焊盘 供应商设备封装:64-TQFP-EP（10x10） 包装:托盘 其它名称:Q5134101 |
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