XRT91L80 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT91L80' PDF : 45 Pages View PDF
XRT91L80
PRELIMINARY
2.488/2.666 GBPS STS-48/STM-16 SONET/SDH TRANSCEIVER
xr
REV. P1.1.0
RECEIVER SECTION
NAME
LEVEL
TYPE
PIN
DESCRIPTION
POLARITY
LVTTL,
I
LVCMOS
C4 Polarity for SDEXT Input
Controls the Signal Detect polarity convention of SDEXT.
"Low" = SDEXT is active "Low."
"High" = SDEXT is active "High."
This pin is provided with an internal pull-down.
LOSDET
LVCMOS
O
C5 LOS Detect Condition
Flags LOSD condition based on SDEXT signal coming from the
optical module.
"Low" = No Alarm
"High" = A LOS condition is present
LOSDMUTE
LVTTL,
I
LVCMOS
A3 Parallel Receive Data Output Mute Upon LOSD
If this pin is asserted "High", the receive data output will auto-
matically be forced to a logic state of "0" when an LOSD condi-
tion occurs.
"Low" = Disabled
"High" = Mute RXDO[3:0]P/N Data Upon LOSD Condition
This pin is provided with an internal pull-down.
POWER AND GROUND
NAME
VDD3.3
TYPE
PWR
AVDD3.3_RX PWR
PIN
A8, D9, D10, D11, E11,
P13, P14
D3, E3
DESCRIPTION
CMOS Digital 3.3V I/O Power Supply
VDD3.3 should be isolated from the analog power supplies. For
best results, use a ferrite bead along with an internal power plane
separation. The VDD3.3 power supply pins should have bypass
capacitors to the nearest ground.
Analog 3.3V I/O Receiver Power Supply
AVDD3.3_RX should be isolated from the digital power supplies.
For best results, use a ferrite bead along with an internal power
plane separation. The AVDD3.3_RX power supply pins should
have bypass capacitors to the nearest ground.
AVDD3.3_TX PWR
P5, P9
Analog 3.3V I/O Transmitter Power Supply
AVDD3.3_TX should be isolated from the digital power supplies.
For best results, use a ferrite bead along with an internal power
plane separation. The AVDD3.3_TX power supply pins should
have bypass capacitors to the nearest ground.
VDD1.8
PWR
A13, B7, B13, D12, E12,
K11, L9, L10, M9, M10,
M11
CMOS Digital 1.8V Core Power Supply
VDD1.8 should be isolated from the analog power supplies. For
best results, use a ferrite bead along with an internal power plane
separation. The VDD1.8 power supply pins should have bypass
capacitors to the nearest ground.
AVDD1.8_RX PWR
D4, D5, D6, D8, F3, G3
Analog 1.8V Core Receiver Power Supply
AVDD1.8_RX should be isolated from the digital power supplies.
For best results, use a ferrite bead along with an internal power
plane separation. The AVDD1.8_RX power supply pins should
have bypass capacitors to the nearest ground.
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