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参数资料
| 型号： | MAX4889CETO+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/12页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH OCTAL SPDT 42TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 开关 |
| 电路： | 8 x SPDT |
| 导通状态电阻： | 7 欧姆 |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 1.65 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 42-WFQFN 裸露焊盘 |
| 供应商设备封装： | 42-TQFN-EP（3.5x9） |
| 包装： | 带卷 (TR) |
Detailed Description
The MAX4889B high-speed passive switch routes PCI
Express (PCIe) data or other high-speed signals with
amplitude of
≤ 1.2VP-P differential, and common-mode
voltage close to 0V between two possible destinations.
The MAX4889B is ideal for routing PCIe signals to
change system configuration. For example, in a graphics
application, four MAX4889B devices create two sets of
eight lanes from a single 16-lane bus. The MAX4889C
feature a 10A (typ) source current and a 60k
Ω (typ)
internal biasing resistor to GND at the _OUT_ terminals.
The MAX4889C is ideal for dual capacitively coupled
applications such as SAS and SATA. The MAX4889B/
MAX4889C feature a single digital control input (SEL) to
switch signal paths. SEL has a 70k
Ω (typ) pulldown
resistor to GND.
The MAX4889B/MAX4889C are fully specified to oper-
ate from a single 3.0V to 3.6V power supply.
Digital Control Input (SEL)
The MAX4889B/MAX4889C provide a single digital
control input (SEL) to select the signal path between
the _IN_ and _OUT_ channels. The truth tables for the
MAX4889B/MAX4889C are illustrated in the
Functional
Diagram/Truth Table. SEL has a 70k
Ω (typ) pulldown
resistor to GND.
Analog Signal Levels
The MAX4889B/MAX4889C accept standard PCIe signals
to a maximum of (VCC - 1.8V). Signals on the _IN+ chan-
nels are routed to either the _OUTA+ or _OUTB+ chan-
nels. Signals on the _IN- channels are routed to either the
_OUTA- or _OUTB- channels. The MAX4889B/MAX4889C
are bidirectional switches, allowing _IN_ and _OUT_ to be
used as either inputs or outputs.
Applications Information
PCIe Switching
The MAX4889B/MAX4889C primary applications are
aimed at reallocating PCIe lanes (see the
Typical
Operating Circuit: Video Graphics Cards). For example,
in graphics applications, several manufacturers have
found that it is possible to improve performance by a fac-
tor of nearly two by splitting a single 16-lane PCIe bus
into two 8-lane buses. Two of the more prominent exam-
ples are SLI (Scaled Link Interface) and CrossFire. Four
MAX4889Bs permit a computer motherboard to operate
properly with a single 16-lane graphics card, which can
later be upgraded to dual cards.
Board Layout
High-speed switches require proper layout and design
procedures for optimum performance. Keep controlled-
impedance PCB traces as short as possible or follow
impedance layouts per the PCIe specification. Ensure
that power-supply bypass capacitors are placed as
close as possible to the device. Multiple bypass capac-
itors are recommended. Connect all grounds and the
exposed pad to large ground planes.
MAX4889B/MAX4889C
2.5/5.0/8.0Gbps PCIe Passive Switches
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4889ETO | 功能描述:模拟开关 IC RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
| MAX4889ETO+ | 功能描述:多路器开关 IC 2.5Gbps PCI Express 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 |
| MAX4889ETO+T | 功能描述:多路器开关 IC 2.5Gbps PCI Express 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 |
| MAX4889ETO-T | 功能描述:模拟开关 IC RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
| MAX488C/D | 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
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