XRT94L31IB-L Exar Corporation, XRT94L31IB-L Datasheet - Page 12

• Manufacturer Part Number: XRT94L31IB-L
• Description: IC MAPPER DS3/E3/STS-1 504TBGA
• Manufacturer: Exar Corporation

Specifications of XRT94L31IB-L

• Applications: Network Switches
• Interface: Bus
• Voltage - Supply: 3.14 V ~ 3.47 V
• Package / Case: 504-LBGA
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

XRT94L31
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC
PIN DESCRIPTION OF THE XRT94L31 (REV. B)
PIN #
AG3
SIGNAL NAME
LOSTTL
I/O
I
TTL
TYPE
Loss of Optical Carrier Input - Primary Receive STS-3/STM-1 PECL
Interface - TTL Input:
If the user is using an Optical Transceiver that contains an LOS (or Sig-
nal Detect) output that is of the CMOS/TTL format, then connect this
LOS output signal to this input pin of the XRT94L31.
Configure the LOSTTL input pin to be either an active-low or an active-
high signal, by pulling the LOSPECL input pin to the appropriate level as
described below.
If this input pin is pulled to the appropriate state such that LOS is TRUE,
then all of the following events will happen.
•
•
N
OTE
The Primary Receive STS-3 TOH Processor block will declare the
Loss of Optical Carrier condition.
The Primary Receive STS-3/STM-1 Line Interface block will declare
the LOS_Detect condition.
: If this input pin is pulled to the appropriate state such that LOS is
LOSPECL
TRUE, this (by itself) will NOT cause the Primary Receive STS-3
TOH Processor block to declare the LOS defect condition.
GND
VDD
12
Active-Low/
Active-High
Active-High
Active-Low
LOSTTL
DESCRIPTION
Setting this input pin "low"
configures the Receive Line
Interface block to declare the
"LOS_Detect" condition.
Setting this input pin "high"
configures the Receive Line
Interface block to declare the
"LOS_Detect" condition.
Description of LOSTTL
REV. 1.0.1