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參數(shù)資料
| 型號： | MAX4891ETJ+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 17/17頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ETHERNET SWITCH OCTAL 32TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 60 |
| 功能： | 以太網(wǎng)開關(guān) |
| 電路： | 8 x 2:1 |
| 導(dǎo)通狀態(tài)電阻： | 5.5 歐姆 |
| 電壓電源： | 單電源 |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 3.6 V |
| 電流 - 電源： | 280µA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 32-TQFN-EP（5x5） |
| 包裝： | 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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4891ETJ+ | 功能描述:多路器開關(guān) IC 10/100/1000 Base-T Ethernet LAN Switch RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| MAX4891ETJ+T | 功能描述:多路器開關(guān) IC 10/100/1000 Base-T Ethernet LAN Switch RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| MAX4891ETJ-T | 功能描述:多路器開關(guān) IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| MAX4892EETX | 功能描述:多路器開關(guān) IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| MAX4892EETX+ | 功能描述:多路器開關(guān) IC 10/100/1000 Base-T Ethernet LAN Switch RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16 |
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