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XR17L154 Datasheet(Hoja de datos) 5 Page - Exar Corporation

No. de Pieza. XR17L154
Descripción  3.3V PCI BUS QUAD UART
Descarga  56 Pages
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Fabricante  EXAR [Exar Corporation]
Página de inicio  http://www.exar.com
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XR17L154
áç
áç
áç
áç
3.3V PCI BUS QUAD UART
REV. 1.1.0
DISCONTINUED
5
NOTE: Pin type: I=Input, O=Output, IO= Input/output, OD=Output Open Drain.
MPIO3
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.
MPIO4
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.
MPIO5
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.
MPIO6
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.
MPIO7
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.
EECK
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.
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
Ω resistor for external
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 L154 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 33MHz for 2Mbps at 3.3V. Caution:
This input is not 5V tolerant.
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). Start up all 4 UARTs in infrared mode
upon power up or reset.
TEST#
111
I
Factory Test. Connect to VCC for normal operation.
VCC
64, 90, 112
PWR
5V or 3.3V power supply for the core logic.
VI/O
4, 19, 34, 45, 137
PWR
PCI bus I/O power supply. 3.3V ONLY (PCI 2.2 Compliance).
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 DESCRIPTIONS
NAME
PIN #TYPE
DESCRIPTION




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