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参数资料
| 型号： | DS26900LN+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 31/49页 |
| 文件大小： | 0K |
| 描述： | IC JTAG MUX/SWITCH 144-LQFP |
| 标准包装： | 90 |
| 系列： | * |
| 功能： | * |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 3.14 V ~ 3.47 V |
| 电流 - 电源： | * |
| 工作温度： | * |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 144-LQFP |
| 供应商设备封装： | 144-LQFP（20x20） |
| 包装： | 托盘 |
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__________________________________________________________________________________________DS26900
37
8. Additional Application Information
8.1
Accessing Individual Device JTAG on a Board
The DS26900 can be used to provide access to individual device JTAG chains on a board. For this configuration,
TMREQ1 and TMREQ2 are tied high and EREQ is tied low, yielding a single-master configuration with a 5-pin
interface. Individual subports on the DS26900 can be selected in configuration mode.
8.2
Using LED Indicators on the SSPI, ACT and MCI Pins
LED indicators can be attached to the
MCI, ACT, and/or SSPI[4:0] pins by connecting the anode of the LED to V
DD
via a series resistor and the cathode connected to the appropriate DS26900 pin. Series resistance should be no
less than approximately 175
to limit current to 8mA.
8.3
Using 2.7V and 1.8V Logic Levels with the DS26900
The DS26900 operates at a nominal supply voltage of 3.3V. The input buffers are designed to switch at midrail
(VDD/2 = ~1.65V) with some hysteresis. This allows the input buffers the ability to sense 2.7V and 1.8V CMOS logic
levels without modification or configuration in some applications. With that in mind, compatibility with 2.7V and 1.8V
CMOS logic levels (other than 3.3V CMOS logic level) is not expressly guaranteed. The output buffers are capable
of 3.3V CMOS (rail-to-rail) logic levels.
8.4
Series Termination Resistors
Although not part of the IEEE 1149.1 specification, some PCB designs require series termination of clock signals at
the electrical source. For the DS26900, the recommended typical series termination value for outputs is 33
. This
value can vary depending on the PCB’s trace geometries.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS26900LN+ | 功能描述:多路器开关 IC JTAG MUX 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 |
| DS26900N+ | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:JTAG Multiplexer/Switch |
| DS26C31 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:CMOS QUAD TRI-STATE DIFFERENTIAL LINE DRIVER |
| DS26C31 DIE | 制造商:Texas Instruments 功能描述: |
| DS26C31_BBA3026X WAF | 制造商:Texas Instruments 功能描述: |
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