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XR17D154 Datasheet(PDF) 8 Page - Exar Corporation |
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XR17D154 Datasheet(HTML) 8 Page - Exar Corporation |
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8 / 69 page  XR17D154 xr UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART REV. 1.2.0 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 5.0V Valid 5.0V 3.3V Valid 3.3V 5.0V Invalid 3.3V 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) M ax Crystal Frequency = 24M Hz M ax External Clock = 50MHz UART Channel 2 UART Channel 3 |
Similar Part No. - XR17D154 |
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Similar Description - XR17D154 |
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