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参数资料
| 型号： | MAX4891ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/17页 |
| 文件大小： | 0K |
| 描述： | IC ETHERNET SWITCH OCTAL 32TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 功能： | 以太网开关 |
| 电路： | 8 x 2:1 |
| 导通状态电阻： | 5.5 欧姆 |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 3.6 V |
| 电流 - 电源： | 280µA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 管件 |
Detailed Description
The MAX4890/MAX4891/MAX4892 are high-speed ana-
log switches targeted for 10/100/1000 Base-T applica-
tions. In a typical application, the MAX4890/MAX4891/
MAX4892 switch the signals from two separate inter-
face transformers and connect the signals to a single
10/100/1000 Base-T Ethernet PHY (see the
Typical
Operating Circuit). This configuration simplifies docking
station design by avoiding signal reflections associated
with unterminated transmission lines in a T configura-
tion. The MAX4891 and MAX4892 also include LED
switches that allow the LED output signals to be routed
to a docking station along with the Ethernet signals.
See the
Functional Diagrams.
The MAX4890/MAX4891/MAX4892 switches provide
an extremely low capacitance and on-resistance
to meet Ethernet insertion and return-loss specifica-
tions. The MAX4891/MAX4892 feature one and three
built-in LED switches, respectively.
The MAX4890/MAX4891/MAX4892 incorporate a unique
architecture design utilizing only n-channel switches
within the main Ethernet switch, reducing I/O capaci-
tance and channel resistance. An internal two-stage
charge pump with a nominal output of 7.5V provides the
high voltage needed to drive the gates of the n-channel
switches, while maintaining a consistently low RON
throughout the input signal range. An internal bandgap
reference set to 1.23V and an internal oscillator running
at 2.5MHz provide proper charge-pump operation.
Unlike other charge-pump circuits, the MAX4890/
MAX4891/MAX4892 include internal flyback capacitors,
reducing design time, board space, and cost.
Digital Control Inputs
The MAX4890/MAX4891/MAX4892 provide a single
digital control SEL. SEL controls the switches as well as
the LED switches as shown in Table 1.
MAX4890/MAX4891/MAX4892
10/100/1000 Base-T Ethernet LAN Switch
_______________________________________________________________________________________
9
SEL
CONNECTION
0
A_ to _B1, LED_ to _LED1
1
A_ to _B2, LED_ to _LED2
Table 1. Truth Table
R15
49.9
Ω
NETWORK
ANALYZER
NETWORK
ANALYZER
NETWORK
ANALYZER
NETWORK
ANALYZER
SINGLE-ENDED BANDWIDTH
50
Ω TRACE
SINGLE-ENDED CROSSTALK
50
Ω TRACE
SINGLE-ENDED OFF-ISOLATION
50
Ω TRACE
50
Ω TRACE
A0
36
A2
2
A3
3
A4
7
4B1
22
3B1
25
2B1
26
0B1
31
50
Ω TRACE
NETWORK
ANALYZER
NETWORK
ANALYZER
50
Ω TRACE
R14
49.9
Ω
R13
49.9
Ω
MAX4892
36 TQFN
Figure 3. Single-Ended Bandwidth, Crosstalk and Off-Isolation
Test Circuits (continued)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4891ETJ+ | 功能描述:多路器开关 IC 10/100/1000 Base-T Ethernet LAN Switch RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MAX4891ETJ+T | 功能描述:多路器开关 IC 10/100/1000 Base-T Ethernet LAN Switch RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MAX4891ETJ-T | 功能描述:多路器开关 IC RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MAX4892EETX | 功能描述:多路器开关 IC RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MAX4892EETX+ | 功能描述:多路器开关 IC 10/100/1000 Base-T Ethernet LAN Switch RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
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