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XR17V258 Datasheet(PDF) 7 Page - Exar Corporation |
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XR17V258 Datasheet(HTML) 7 Page - Exar Corporation |
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7 / 70 page  XR17V258 7 REV. 1.0.1 66MHZ PCI BUS OCTAL UART WITH POWER MANAGEMENT SUPPORT NOTE: Pin type: I=Input, O=Output, IO= Input/output, OD=Output Open Drain. TMRCK 69 I 16-bit timer/counter external clock input. ENIR 70 I Infrared mode enable (active high). This pin is sampled during power up, fol- lowing a hardware reset (RST#) or soft-reset (register RESET). It can be used to start up all 8 UARTs in the infrared mode. The sampled logic state is transferred to MCR bit [6] in the UART. VCC 64, 90,112, 4, 19, 34, 45, 137 Power supply for the UART core logic and PCI bus I/O - 3.3V only. The V258 is PCI 3.0 signalling compliant at 3.3V operation. The non-PCI inputs (except XTAL1) are 5V tolerant. This includes all the serial (modem) inputs. GND 5,20,35,46,63, 89,136 Power supply common, ground. PIN DESCRIPTIONS NAME PIN #TYPE DESCRIPTION |
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