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參數(shù)資料
| 型號： | DS26900LN+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 15/49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
22
4.1.3 Deselect Mode and Redundancy
Deselect Mode allows multiple devices to be connected in parallel with the use of external logic controlling the
M[1:0] and PREN pins. Deselect Mode is enabled when the mode pins (M[1:0]) are both set high. This internally
forces the
TMREQ1, TMREQ2, and EREQ signals to go high, causing the DS26900 to act as though no active
master is present. When both mode pins are set low via the external select logic, the device is selected and
operated in Single-Package Mode.
Applications requiring device redundancy can be achieved by asserting
PTRST low and HIZ low. This causes
outputs to become high impedance and disables the pullups and pulldowns. During normal operation,
PTRST is
asserted low and
HIZ is asserted high.
A device that is deselected (M[1:0] = 11) internally acts as if an arbitrated master is not present. The Switch TAP
Controller goes into Test-Logic-Reset (and the instruction register is cleared). The other programmable registers
are left unchanged.
Figure 4-4. Three Cascaded Devices Using External Select Logic
DS26900
ETM
TM1
TM2
SECONDARY 1
SECONDARY 18
PREN
M[1:0] = 00/11
VDD
EXTERNAL
TEST MASTER
TEST MASTER 1
TEST MASTER 2
6
ETM
TM1
TM2
PREN
SECONDARY 1
SECONDARY 18
DS26900
5
INSTRUCTION CODE = "0xxxx"
ETM
TM1
TM2
PREN
SECONDARY 1
SECONDARY 18
DS26900
5
INSTRUCTION CODE = "0xxxx"
M[1:0] = 00/11
MODE
SELECT
LOGIC
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| 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(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 傳播延遲時(shí)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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