xr17l154iv Exar Corporation, xr17l154iv Datasheet - Page 5

• Manufacturer Part Number: xr17l154iv
• Description: 3.3v Pci Bus Quad Uart
• Manufacturer: Exar Corporation

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