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參數(shù)資料
| 型號： | DS26900LN+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 31/49頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC JTAG MUX/SWITCH 144-LQFP |
| 標(biāo)準(zhǔn)包裝： | 90 |
| 系列： | * |
| 功能： | * |
| 電壓電源： | 單電源 |
| 電壓 - 電源，單路/雙路(±)： | 3.14 V ~ 3.47 V |
| 電流 - 電源： | * |
| 工作溫度： | * |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 144-LQFP |
| 供應(yīng)商設(shè)備封裝： | 144-LQFP（20x20） |
| 包裝： | 托盤 |
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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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS26900LN+ | 功能描述:多路器開關(guān) IC JTAG MUX 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(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| DS26900N+ | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:JTAG Multiplexer/Switch |
| DS26C31 | 制造商:NSC 制造商全稱: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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