XR17L154 Datasheet, PDF (5/56 Pages) Exar Corporation – 3.3V PCI BUS QUAD UART

XR17L154
3.3V PCI BUS QUAD UART
REV. 1.1.0
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DISCONTINUED
PIN DESCRIPTIONS
NAME
MPIO3
MPIO4
MPIO5
MPIO6
MPIO7
EECK
EECS
EEDI
EEDO
XTAL1
XTAL2
TMRCK
ENIR
TEST#
VCC
VI/O
GND
NC
PIN #
TYPE
DESCRIPTION
73
I/O Multi-purpose input/output 3. The function of this pin is defined thru the Con-
figuration Register MPIOSEL, MPIOLVL, MPIOINV, MPIO3T and MPIOINT.
68
I/O Multi-purpose input/output 4. The function of this pin is defined thru the Con-
figuration Register MPIOSEL, MPIOLVL, MPIOINV, MPIO3T and MPIOINT.
67
I/O Multi-purpose input/output 5. The function of this pin is defined thru the Con-
figuration Register MPIOSEL, MPIOLVL, MPIOINV, MPIO3T and MPIOINT.
66
I/O Multi-purpose input/output 6. The function of this pin is defined thru the Con-
figuration Register MPIOSEL, MPIOLVL, MPIOINV, MPIO3T and MPIOINT.
65
I/O Multi-purpose input/output 7. The function of this pin is defined thru the Con-
figuration Register MPIOSEL, MPIOLVL, MPIOINV, MPIO3T and MPIOINT.
116
O Serial clock to EEPROM. Pin has a weak internal pull-down resistor and
requires an external 10K resistor to operate correctly with the EEPROM. An
internal clock of CLK divide by 256 is used for reading the vendor and sub-
vendor ID and model number during power up or reset. However, it can be
manually clocked thru the Configuration Register REGB.
115
O Chip select to a EEPROM device like 93C46. It is manually selectable thru the
Configuration Register REGB. Requires a pull-up 4.7KΩ resistor for external
sensing of EEPROM during power up. See DAN112 for further details.
114
O Write data to EEPROM device. It is manually accessible thru the Configura-
tion Register REGB. The L154 auto-configuration register interface logic uses
the 16-bit format.
113
I Read data from EEPROM device. It is manually accessible thru the Configu-
ration Register REGB.
110
I Crystal or external clock input of up to 33MHz for 2Mbps at 3.3V. Caution:
This input is not 5V tolerant.
109
O Crystal or buffered clock output.
69
I 16-bit timer/counter external clock input.
70
I Infrared mode enable (active high). Start up all 4 UARTs in infrared mode
upon power up or reset.
111
I Factory Test. Connect to VCC for normal operation.
64, 90, 112 PWR 5V or 3.3V power supply for the core logic.
4, 19, 34, 45, 137 PWR PCI bus I/O power supply. 3.3V ONLY (PCI 2.2 Compliance).
5,20,35,46,63, PWR Power supply common, ground.
89,136
47-54, 71, 72,
75-80, 91-98,
117-124
No Connection. These pins are reserved and used by the octal PCI UART
XR17C158.
NOTE: Pin type: I=Input, O=Output, IO= Input/output, OD=Output Open Drain.
5