參數(shù)資料
型號(hào): XR17D158CV
廠商: EXAR CORP
元件分類: 微控制器/微處理器
英文描述: UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART
中文描述: 8 CHANNEL(S), 6.25M bps, SERIAL COMM CONTROLLER, PQFP144
封裝: 20 X 20 MM, 1.40 MM HEIGHT, TQFP-144
文件頁數(shù): 9/72頁
文件大?。?/td> 1520K
代理商: XR17D158CV
xr
REV. 1.2.1
UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART
XR17D158
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.
T
ABLE
1: V
ALID
C
OMBINATIONS
OF
VCC
AND
VIO S
UPPLY
V
OLTAGES
VCC
VIO
5.0V
5.0V
Valid
5.0V
3.3V
Valid
3.3V
5.0V
Invalid
3.3V
3.3V
Invalid
F
IGURE
3. T
YPICAL
A
PPLICATION
FOR
A
U
NIVERSAL
A
DD
-
IN
C
ARD
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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