xr17d152im Exar Corporation, xr17d152im Datasheet - Page 7

• Manufacturer Part Number: xr17d152im
• Description: Universal 3.3v And 5v Pci Bus Dual Uart
• Manufacturer: Exar Corporation

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REV. 1.2.0
The XR17D152 is designed to operate with VCC (voltage to the UART Core Logic) greater than or equal to
VIO. 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
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
applications of the XR17D152 in an embedded system.
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F
1.0 APPLICATION EXAMPLES
IGURE
3. T
YPICAL
(3.3V or 5V)
(up to 33.34MHz)
A
VIO
PPLICATION FOR A
CLK
Interface
Local
U
PCI
Bus
NIVERSAL
A
DD
M ax Crystal Frequency = 24M Hz
7
-
M ax External Clock = 50MHz
IN
UNIVERSAL (3.3V AND 5V) PCI BUS DUAL UART
UART Core Logic
C
ARD
UART Channel 0
UART Channel 1
Figure
4, examples 1-3 show valid
VCC = 5V
Figure
XR17D152
3. In an