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XR17C154 Datasheet(PDF) 5 Page - Exar Corporation |
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XR17C154 Datasheet(HTML) 5 Page - Exar Corporation |
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5 / 62 page  xr XR17C154 REV. 1.3.2 5V PCI BUS QUAD UART 5 NOTE: Pin type: I=Input, O=Output, IO= Input/output, OD=Output Open Drain. EECK 116 O Serial clock to EEPROM. An internal clock of CLK divide by 256 is used for reading the vendor and sub-vendor ID during power up or reset. However, it can be manually clocked thru the Configuration Register REGB. 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 resister 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. The 154 auto-configuration register interface logic uses the 16-bit format. 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 of up to 50MHz for data rate of 3.125Mbps at 5V. 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 4 UARTs in the infrared mode. The sampled logic state is trans- ferred to MCR bit-6 in the UART. Software can override this pin thereafter and enable or disable it. TEST# 111 I Factory Test. Connect to VCC for normal operation. VCC 4,19,34,45,64, 90,112,137 PWR +5V (PCI Compliance). For 3.3V operation, see the XR17D154. GND 5,20,35,46,63, 89,136 PWR Power supply common, ground. NC 47-54, 71,72,75-80, 91-98, 117-124 No Connection. These pins are reserved and used by the octal PCI UART XR17C158. Pin Description NAME PIN #TYPE DESCRIPTION |
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Similar Description - XR17C154 |
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