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| 型号： | MAX4927ETN+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC ETHERNET SWITCH QUAD 56TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 27 |
| 功能： | 以太网开关 |
| 电路： | 4 x 2:2 |
| 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： | 56-WFQFN 裸露焊盘 |
| 供应商设备封装： | 56-TQFN-EP（5x11） |
| 包装： | 管件 |
| 产品目录页面： | 1421 (CN2011-ZH PDF) |
MAX4927
1000 Base-T, ±15kV ESD Protection LAN Switch
_______________________________________________________________________________________
7
Detailed Description
The MAX4927 is a high-speed analog switch targeted
for 1000 Base-T applications. In a typical application,
the MAX4927 switches the signals from two separate
interface transformers and connects the signals to a
single 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 MAX4927 is protected against ±15kV electro-
static discharge (ESD) events. The MAX4927 also
includes LED switches that allow the LED output sig-
nals to be routed to a docking station along with the
Ethernet signals. See the Functional Diagrams.
With its low resistance and capacitance, as well as high
ESD protection, the MAX4927 can be used to switch
most low-voltage differential signals, such as LVDS,
SERDES, and LVPECL, as long as the signals do not
exceed maximum ratings of the device.
The MAX4927 switch provides an extremely low capac-
itance and on-resistance to meet Ethernet insertion and
return-loss specifications. The MAX4927 features three
built-in LED switches.
The MAX4927 incorporates a unique architecture design
utilizing only n-channel switches within the main Ethernet
switch, reducing I/O capacitance and channel resis-
tance. An internal two-stage charge pump with a nomi-
nal 7.5V output provides the high voltage needed to
drive the gates of the n-channel switches while maintain-
ing 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 cir-
cuits, the MAX4927 includes internal flyback capacitors,
reducing design time, board space, and cost.
Digital Control Inputs
The MAX4927 provides a single digital control input,
SEL. SEL controls the high-frequency switches as well
as the LED switches as shown in Table 1.
Analog Signal Levels
The on-resistance of the MAX4927 is very low and sta-
ble as the analog input signals are swept from ground
to VDD (see the Typical Operating Characteristics). The
switches are bidirectional, allowing A_ and _B_ to be
configured as either inputs or outputs.
±15kV ESD Protection
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. All the high-frequency switch inputs (A_,
_B_), LED switch inputs (LED_, _LED_), and SEL have
high ESD protection against static electricity. Maxim’s
engineers have developed state-of-the-art structures to
protect these pins against ESD of ±15kV without dam-
age. After an ESD event, the MAX4927 keeps working
without latchup or damage.
ESD protection can be tested in various ways. All signal
and control inputs of the MAX4927 are characterized
for protection to the following limits:
±15kV using the Human Body Model
±8kV using the Contact Discharge Method specified
in IEC 61000-4-2
±15kV using the Air-Gap Discharge Method specified
in IEC 61000-4-2
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
PIN
NAME
FUNCTION
51
2LED2
2LED2 Output. Drive SEL high (SEL = 1) to connect LED2 to 2LED2.
52
2LED1
2LED1 Output. Drive SEL low (SEL = 0) to connect LED2 to 2LED1.
54
LED2
LED2 Input
EP
Exposed Paddle. Connect EP to GND or leave EP unconnected.
Pin Description (continued)
SEL
CONNECTION
0
A_ to _B1, LED_ to _LED1
1
A_ to _B2, LED_ to _LED2
Table 1. Truth Table
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4927ETN+ | 功能描述:多路器开关 IC 1000 Base-T 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 |
| MAX4927ETN+T | 功能描述:多路器开关 IC 1000 Base-T 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 |
| MAX4928AETN+ | 功能描述:多路器开关 IC DisplayPort/PCIe Passive 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 |
| MAX4928AETN+T | 功能描述:多路器开关 IC DisplayPort/PCIe Passive 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 |
| MAX4928BETN+ | 功能描述:多路器开关 IC DisplayPort/PCIe Passive 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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