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參數(shù)資料
| 型號： | LTC4315CDE#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 20/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC 2WIRE BUS BUFFER 12DFN |
| 標(biāo)準(zhǔn)包裝： | 91 |
| 類型： | 2線總線緩沖器 |
| Tx/Rx類型： | I²C Logic |
| 電容 - 輸入： | 10pF |
| 電源電壓： | 2.9 V ~ 5.5 V |
| 電流 - 電源： | 8.1mA |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 12-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 12-DFN（4x3） |
| 包裝： | 管件 |
LTC4315
9
4315f
The LTC4315 provides capacitance buffering, data and
clock Hot Swap capability and level translation of I2C signals
on its clock and data pins. The high noise margin of the
LTC4315 permits interoperability with I2C devices that drive
a high VOL,permitsseriesconnectionofmultipleLTC4315s
and provides improved I2C communication reliability.
The LTC4315 isolates backplane and card capacitances,
provides slew limited acceleration of rising edges and slew
control of falling edges while level translating 1.5V, 1.8V,
2.5V, 3.3V and 5V busses. These features are illustrated
in the following subsections.
RISE TIME ACCELERATOR (RTA) PULL-UP CURRENT
STRENGTH
After an input to output connection has been established
the RTAs on both the input and output sides of the SDA
and SCL busses are activated based on the state of the
ACC pin and the VCC2 supply voltage. During positive bus
transitions of at least 0.4V/μs, the RTAs provide pull-up
currents to reduce rise time. Enabling the RTAs allows
users to choose larger bus pull-up resistors to reduce
power consumption and improve logic low noise margins,
to design with bus capacitances outside of the I2C speci-
fication and to operate at a higher clock frequency. The
function of the ACC pin in setting IRTA is summarized in
Table 1. In the strong mode (ACC low) the acceleration is
slew limited to a maximum bus rise rate of 75V/μs. The
strong mode current is therefore directly proportional to
the bus capacitance. The LTC4315 is capable of sourcing
up to 40mA of current in the strong mode. If ACC is left
open, rise time acceleration is provided by a 2.5mA pull up.
TABLE 1: ACC Control of the RTA Current IRTA
ACC
IRTA
Low
Strong
Hi-Z
2.5mA
High
None
The ACC pin has a resistive divider between VCCandground
to set its voltage to 0.5 VCC if left open.
APPLICATIONS INFORMATION
Figures 1 and 2 show the rising waveforms of heavily
loaded SDAIN and SDAOUT busses with the ACC pin set for
strong mode and 2.5mA current source mode respectively.
In both figures, during a rising edge, the buffers are active
and the input and output sides connected, until the bus
voltages on both the input and output sides are greater than
0.33 VMIN, where VMIN is the lower of the VCC and VCC2
voltages. When each individual bus voltage rises above
0.41 VMIN, the RTA on that bus turns on. The effect of the
acceleration strength is shown in the SDA waveforms in
Figures 1 and 2 for identical bus loads. The RTAs supply
10mA and 2.5mA of pull-up current IRTA in the strong and
current source modes respectively for the bus conditions
shown in Figures 1 and 2. For identical bus loads, the bus
rises faster in Figure 1 compared to Figure 2 because of
the higher IRTA.
Figure 1. Bus Rising Edge for the Strong Acceleration Mode.
VCC = VCC2 = 5V
Figure 2. Bus Rising Edge for the Current Source
Acceleration Mode. VCC = VCC2 = 5V
2V/DIV
1μs/DIV
4315 F01
VCC = VCC2 = 5V
RBUS = 20k
CIN = COUT = 200pF
ACC = 0V
SDAIN
SDAOUT
2V/DIV
1μs/DIV
4315 F02
VCC = VCC2 = 5V
RBUS = 20k
CIN = COUT = 200pF
ACC = OPEN
SDAIN
SDAOUT
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| LTC4315CMS#PBF | 功能描述:IC 2WIRE BUS BUFFER 12MSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 信號緩沖器，中繼器，分配器 系列:- 標(biāo)準(zhǔn)包裝:160 系列:- 類型:轉(zhuǎn)發(fā)器 Tx/Rx類型:以太網(wǎng) 延遲時(shí)間:- 電容 - 輸入:- 電源電壓:2.37 V ~ 2.63 V 電流 - 電源:60mA 安裝類型:表面貼裝 封裝/外殼:64-TQFP 裸露焊盤 供應(yīng)商設(shè)備封裝:64-TQFP-EP（10x10） 包裝:托盤 其它名稱:Q5134101 |
| LTC4315CMS#TRPBF | 功能描述:IC 2WIRE BUS BUFFER 12MSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 信號緩沖器，中繼器，分配器 系列:- 標(biāo)準(zhǔn)包裝:160 系列:- 類型:轉(zhuǎn)發(fā)器 Tx/Rx類型:以太網(wǎng) 延遲時(shí)間:- 電容 - 輸入:- 電源電壓:2.37 V ~ 2.63 V 電流 - 電源:60mA 安裝類型:表面貼裝 封裝/外殼:64-TQFP 裸露焊盤 供應(yīng)商設(shè)備封裝:64-TQFP-EP（10x10） 包裝:托盤 其它名稱:Q5134101 |
| LTC4315IDE#PBF | 功能描述:IC 2WIRE BUS BUFFER 12DFN RoHS:是 類別:集成電路 (IC) >> 接口 - 信號緩沖器，中繼器，分配器 系列:- 標(biāo)準(zhǔn)包裝:160 系列:- 類型:轉(zhuǎn)發(fā)器 Tx/Rx類型:以太網(wǎng) 延遲時(shí)間:- 電容 - 輸入:- 電源電壓:2.37 V ~ 2.63 V 電流 - 電源:60mA 安裝類型:表面貼裝 封裝/外殼:64-TQFP 裸露焊盤 供應(yīng)商設(shè)備封裝:64-TQFP-EP（10x10） 包裝:托盤 其它名稱:Q5134101 |
| LTC4315IDE#TRPBF | 功能描述:IC 2WIRE BUS BUFFER 12DFN RoHS:是 類別:集成電路 (IC) >> 接口 - 信號緩沖器，中繼器，分配器 系列:- 標(biāo)準(zhǔn)包裝:160 系列:- 類型:轉(zhuǎn)發(fā)器 Tx/Rx類型:以太網(wǎng) 延遲時(shí)間:- 電容 - 輸入:- 電源電壓:2.37 V ~ 2.63 V 電流 - 電源:60mA 安裝類型:表面貼裝 封裝/外殼:64-TQFP 裸露焊盤 供應(yīng)商設(shè)備封裝:64-TQFP-EP（10x10） 包裝:托盤 其它名稱:Q5134101 |
| LTC4315IMS#PBF | 功能描述:IC 2WIRE BUS BUFFER 12MSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 信號緩沖器，中繼器，分配器 系列:- 標(biāo)準(zhǔn)包裝:160 系列:- 類型:轉(zhuǎn)發(fā)器 Tx/Rx類型:以太網(wǎng) 延遲時(shí)間:- 電容 - 輸入:- 電源電壓:2.37 V ~ 2.63 V 電流 - 電源:60mA 安裝類型:表面貼裝 封裝/外殼:64-TQFP 裸露焊盤 供應(yīng)商設(shè)備封裝:64-TQFP-EP（10x10） 包裝:托盤 其它名稱:Q5134101 |
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