REV. 1.2.2 UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART 9 1.0 APPLICATION EXAMPLES The XR17D158 is designed to operate with VCC (volt" />
參數資料
型號: XR17D158CV
廠商: Exar Corporation
文件頁數: 73/73頁
文件大?。?/td> 0K
描述: IC UART PCI BUS OCTAL 144LQFP
產品變化通告: Leaded UART, V&I Obsolescence 11/Apr/2011
標準包裝: 60
特點: *
通道數: 8
FIFO's: 64 字節(jié)
規(guī)程: RS485
電源電壓: 3.3V,5V
帶自動流量控制功能:
帶IrDA 編碼器/解碼器:
帶故障啟動位檢測功能:
帶調制解調器控制功能:
安裝類型: 表面貼裝
封裝/外殼: 144-LQFP
供應商設備封裝: 144-LQFP(20x20)
包裝: 托盤
xr
XR17D158
REV. 1.2.2
UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART
9
1.0 APPLICATION EXAMPLES
The XR17D158 is designed to operate with VCC (voltage to the UART Core Logic) at 5V only, irrespective of
whether the PCI bus is at 3.3V or 5V. Table 1 below shows the valid combinations of VCC and the PCI Bus
Voltage, VIO that can be used for the device..
A typical application for a universal add-in card (VCC must be 5V) is shown in Figure 3. In an embedded
system, the designer must still choose 5V power supply for the VCC regardless of VIO (3.3 or 5V). In
Figure 4, examples 1 and 2 show valid applications of the XR17D158 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
Invalid
FIGURE 3. TYPICAL APPLICATION FOR A UNIVERSAL ADD-IN CARD
PCI
Local
Bus
Interface
UART Channel 7
UART Channel 6
UART Channel 5
UART Channel 4
UART Channel 3
UART Channel 2
UART Channel 1
UART Channel 0
UART Core Logic
VCC = 5V
VIO
(3.3V or 5V)
CLK
(up to 33.34 MHz)
Max Crystal Frequency = 24MHz
Max External Clock = 50MHz
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