REV. 1.2.2 8 1.0 APPLICATION EXAMPLES The XR17D154 is designed to operate with VCC (volta" />
參數(shù)資料
型號: XR17D154IV
廠商: Exar Corporation
文件頁數(shù): 68/69頁
文件大?。?/td> 0K
描述: IC UART PCI BUS QUAD 144LQFP
產(chǎn)品變化通告: Leaded UART, V&I Obsolescence 11/Apr/2011
標(biāo)準(zhǔn)包裝: 60
特點: *
通道數(shù): 4,QUART
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(diào)制解調(diào)器控制功能:
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
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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