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| 型号： | LTC4305CGN#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/20页 |
| 文件大小： | 0K |
| 描述： | IC BUFFER BUS 2WR ADDRESS 16SSOP |
| 产品培训模块： | LTC4310 - Hot-Swappable I²C Isolators |
| 标准包装： | 100 |
| 应用： | 带放大器的多路复用器 |
| 接口： | SMBus（2 线/I²C） |
| 电源电压： | 2.2 V ~ 5.5 V |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
| 产品目录页面： | 1355 (CN2011-ZH PDF) |
LTC4305
11
4305f
separated by the series combination of their switches’ on
resistances. While neither, either or both downstream
buses may be connected at the same time, logic high
levels are corrupted if both downstream buses are active
and both the VCC voltage and one downstream bus pull-up
voltage are larger than the pull-up supply voltage of the
other downstream bus. An example of this issue is shown
in Figure 1. During logic highs, DC current flows from
VBUS1 through the series combination of R1, N1, N2 and
R2 and into VBUS2, causing the SDA1 voltage to drop and
current to be sourced into VBUS2. To avoid this problem,
do not activate bus 1 when bus 2 is active.
first, the pin’s voltage is rising at a minimum slew rate of
0.8V/
s; second, the voltages on both the upstream bus
and the connected downstream buses exceed 0.8V.
Note that a downstream bus must be connected to the
upstream bus in order for its rise time accelerator current
to be active. See the Applications Section for choosing a
bus pull-up resistor value to ensure that the rise time
accelerator switches turn on. Do not activate boost cur-
rents on a bus whose pull-up supply voltage VBUS < VCC.
Doing so would cause the boost currents to source
current from VCC into the VBUS supply during rising
edges.
Downstream Bus Connection Fault
By default, the LTC4305 will only connect to downstream
buses whose SDA and SCL pins are both high (above 1V)
at the moment that it receives the connection command.
In this case, the LTC4305 sets the Failed Connection
Attempt bit of register 0 low and pulls the ALERT low when
the master tries to connect to a low downstream bus. Note
that users can write a high to the Connection Requirement
bit of register 2 to program the LTC4305 to connect to
downstream buses regardless of their logic state at the
moment of connection. In this case, the Downstream
Channel Connection Fault never occurs.
Stuck Low Timeout Fault
The Stuck Low Timeout Circuitry monitors the two com-
mon internal nodes of the downstream SDA and SCL
switches and runs a timer whenever either of the internal
node voltages is below 0.52V. The timer is reset whenever
both internal node voltages are above 0.6V. If the timer
ever reaches the time programmed by Timeout Mode Bits
1 and 0 of register 2, the LTC4305 pulls ALERT low and
OPERATIO
U
Rise Time Accelerators
The Upstream Accelerators Enable and Downstream Ac-
celerators Enable bits of register 1 activate the upstream
and downstream rise time accelerators, respectively. When
activated, the accelerators turn on in a controlled manner
and source current into the pins during positive bus
transitions.
When no downstream buses are connected, an upstream
accelerator turns on when its pin voltage exceeds 0.8V
and is rising at a minimum slew rate of 0.8V/
s. When one
or more downstream buses are connected, the accelera-
tor on a given pin turns on when these conditions are met:
Figure 1. Example of Unacceptable Level Shifting
SDA2
4305 F01
SDA1
R1
10k
R2
10k
N1
N2
VCC = VBUS1 = 5V
VBUS2 = 2.5V
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4305IDHD | 功能描述:IC BUFFER BUS 2WR ADDRESS 16-DFN RoHS:否 类别:集成电路 (IC) >> 接口 - 专用 系列:- 特色产品:NXP - I2C Interface 标准包装:1 系列:- 应用:2 通道 I²C 多路复用器 接口:I²C，SM 总线 电源电压:2.3 V ~ 5.5 V 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:剪切带 (CT) 安装类型:表面贴装 产品目录页面:825 (CN2011-ZH PDF) 其它名称:568-1854-1 |
| LTC4305IDHD#PBF | 功能描述:IC BUFFER BUS 2WR ADDRESS 16-DFN RoHS:是 类别:集成电路 (IC) >> 接口 - 专用 系列:- 特色产品:NXP - I2C Interface 标准包装:1 系列:- 应用:2 通道 I²C 多路复用器 接口:I²C，SM 总线 电源电压:2.3 V ~ 5.5 V 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:剪切带 (CT) 安装类型:表面贴装 产品目录页面:825 (CN2011-ZH PDF) 其它名称:568-1854-1 |
| LTC4305IDHD#TR | 功能描述:IC BUFFER BUS 2WR ADDRESS 16-DFN RoHS:否 类别:集成电路 (IC) >> 接口 - 专用 系列:- 特色产品:NXP - I2C Interface 标准包装:1 系列:- 应用:2 通道 I²C 多路复用器 接口:I²C，SM 总线 电源电压:2.3 V ~ 5.5 V 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:剪切带 (CT) 安装类型:表面贴装 产品目录页面:825 (CN2011-ZH PDF) 其它名称:568-1854-1 |
| LTC4305IDHD#TRPBF | 功能描述:IC BUFFER BUS 2WR ADDRESS 16-DFN RoHS:是 类别:集成电路 (IC) >> 接口 - 专用 系列:- 特色产品:NXP - I2C Interface 标准包装:1 系列:- 应用:2 通道 I²C 多路复用器 接口:I²C，SM 总线 电源电压:2.3 V ~ 5.5 V 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:剪切带 (CT) 安装类型:表面贴装 产品目录页面:825 (CN2011-ZH PDF) 其它名称:568-1854-1 |
| LTC4305IGN | 功能描述:IC BUFFER BUS 2WR ADDRESS 16SSOP RoHS:否 类别:集成电路 (IC) >> 接口 - 专用 系列:- 特色产品:NXP - I2C Interface 标准包装:1 系列:- 应用:2 通道 I²C 多路复用器 接口:I²C，SM 总线 电源电压:2.3 V ~ 5.5 V 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:剪切带 (CT) 安装类型:表面贴装 产品目录页面:825 (CN2011-ZH PDF) 其它名称:568-1854-1 |
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