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XR17C158 Datasheet(PDF) 6 Page - Exar Corporation |
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XR17C158 Datasheet(HTML) 6 Page - Exar Corporation |
6 / 67 page XR17C158 xr 5V PCI BUS OCTAL UART REV. 1.4.3 6 NOTE: Pin type: I=Input, O=Output, IO= Input/output, OD=Output Open Drain. EECS 115 O Chip select to a EEPROM device like 93C46. It is manually selectable thru the Configuration Register REGB. Requires a pull-up 4.7K ohm resistor for exter- nal sensing of EEPROM during power up. See DAN112 for further details. EEDI 114 O Write data to EEPROM device. It is manually accessible thru the Configura- tion Register REGB. EEDO 113 I Read data from EEPROM device. It is manually accessible thru the Configu- ration Register REGB. XTAL1 110 I Crystal or external clock input. XTAL2 109 O Crystal or buffered clock output. 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 trans- ferred to MCR bit-6 in the UART. TEST# 111 I Factory Test. Connect to VCC for normal operation. VCC 4,19,34,45,64, 90,112,137 +5V power supply. For a pin-to-pin compatible device that operates at 3.3V, see the XR17D158. GND 5,20,35,46,63, 89,136 Power supply common, ground. Pin Description NAME PIN #TYPE DESCRIPTION |
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