参数资料
型号: XR17D154IV
厂商: Exar Corporation
文件页数: 68/69页
文件大小: 0K
描述: IC UART PCI BUS QUAD 144LQFP
产品变化通告: Leaded UART, V&I Obsolescence 11/Apr/2011
标准包装: 60
特点: *
通道数: 4,QUART
FIFO's: 64 字节
规程: RS485
电源电压: 3.3V,5V
带自动流量控制功能:
带IrDA 编码器/解码器:
带故障启动位检测功能:
带调制解调器控制功能:
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
XR17D154
xr
UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART
REV. 1.2.2
8
1.0 APPLICATION EXAMPLES
The XR17D154 is designed to operate with VCC (voltage to the UART Core Logic) greater than or equal to
VIO. See Table 1 below for valid combintions of VCC and VIO that can be used with the device..
For a universal add-in card, it is usually unknown whether it will be plugged into a 3.3V or 5V PCI slot, therefore
VCC must be 5V to guarantee proper functionality in any PCI slot as shown in Figure 3. In an embedded
system, the designer can choose to use a 3.3V or 5V power supply for the UART core voltage. Of course, the
core voltage can be 3.3V only when the VIO is 3.3V. In Figure 4, examples 1-3 show valid applications of the
XR17D154 in an embedded system.
TABLE 1: VALID COMBINATIONS OF VCC AND VIO SUPPLY VOLTAGES
VCC
VIO
5.0V
Valid
5.0V
3.3V
Valid
3.3V
5.0V
Invalid
3.3V
Valid
FIGURE 3. TYPICAL APPLICATION FOR A UNIVERSAL ADD-IN CARD
PCI
Local
Bus
Interface
UART Channel 1
UART Channel 0
UART Core Logic
VCC = 5V
VIO
(3.3V or 5V)
CLK
(up to 33.34MHz)
Max Crystal Frequency = 24MHz
Max External Clock = 50MHz
UART Channel 2
UART Channel 3
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