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参数资料
| 型号： | DS26900LN+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/49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
21
DS26900
ETM
TM1
TM2
SECONDARY 1
SECONDARY 18
PREN
M[1:0] = 10 (EXTENSION)
M[1:0] = 01 (MASTER)
VDD
EXTERNAL
TEST MASTER
TEST MASTER 1
TEST MASTER 2
6
ETM
TM1
TM2
PREN
SECONDARY 19
SECONDARY 36
DS26900
5
INSTRUCTION CODE = "0xxxx"
INSTRUCTION CODE = "1xxxx"
4.1.2 Cascade Configuration Modes
The cascade configuration allows two devices to be connected together, the cascade master and the cascade
extension device. This provides access to 36 secondary ports plus the TM1 and TM2 ports (as slave ports) of the
extension device without external control logic. The cascade master has its mode pins (M[1:0]) set = 01 and the
cascade extension has its mode pins (M[1:0]) set = 10. See Table 4-1 for M0 and M1 pin settings. In Figure 4-3,
secondary ports 1 to 18 or 19 to 36 are selected by the MSB of the instruction code. Each device has a 5-bit
instruction register. The lower four LSBs have common definitions between the cascade devices, but the MSB of
the 5-bit instruction register acts as an address bit. Instructions to be executed by the cascade master have their
MSB set to 0. Instructions to be executed by the cascade extension have their MSB set to 1. The same instructions
are loaded into each device, but only the appropriate device (determined by the mode pin setting) executes the
instruction. The PREN pin on the cascade master is connected = VDD to enable internal pullup/down resistors. On
the cascade extension device, PREN is connected = VSS to disable internal pullup/down resistors.
If one or more master ports are unused, their REQ input pin(s) must be connected = VDD and the remaining unused
inputs must be connected = VDD or VSS, but cannot be left unconnected.
Figure 4-3. Two Cascaded Devices
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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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