XRT72L53 Datasheet, PDF (30/467 Pages) Exar Corporation – THREE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

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PRELIMINARY
XRT72L53
THREE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.7
PIN DESCRIPTION CONNECTED PINS
PIN #
T20
PIN NAME
MOTO
U3
RxAIS[2]
U4
GND
U5
RLOOP[2]
U6
VDD
U8
GND
U9
RxOHEnable[2]/
RxHDLCDat5[2]
U10
VDD
U11
TxSer[2]/
SndMsg[2]
U12
TxNib2[2]/
TxHDLCDat2[2]
U13
GND
U14
TxFrame[2]
U15
VDD
U17
GND
U19
RxFrame[2]
U20
TestMode
V1
RxLOS[2]
V6
TxAISEn[2]
TYPE
I
O
****
O
****
****
O
****
I
I
****
O
****
****
O
***
O
I
DESCRIPTION
Motorola/Intel Processor Interface Select Mode:
This input pin allows the user to configure the Microprocessor Interface
to interface with either a Motorola-type or Intel-type microprocessor/
microcontroller. Tying this input pin to VDD, configures the microproces-
sor interface to operate in the Motorola mode (e.g., the Framer device
can be readily interfaced to a Motorola type local microprocessor). Tying
this input pin to GND configures the Microprocessor Interface to operate
in the Intel Mode (e.g., the Framer device can be readily interfaced to a
“Intel type local microprocessor).
Receive AIS (Alarm Indication Signal) Indicator - Channel 2:
See Description for Pin C5
Ground
Remote Looback Output pin - Channel 2 (to be connected to the
DS3/E3 LIU IC):
See Description for Pin B7
Power Supply +3.3v ± 5%
Ground
Receive Overhead Enable Indicator/Receive HDLC Controller Data
Output - Bit 5; Channel 2:
See Description for Pin B13
Power Supply +3.3v ± 5%
Transmit Serial Payload Data Input pin/Transmit HDLC Controller -
SEND MESSAGE Input pin - Channel 2:
See Description for Pin E18
Transmit Nibble-Parallel Payload Data Input - Bit 2/Transmit HDLC
Data Input - Bit 2; Channel 2:
See Description for Pin C20
Ground
Transmit End of DS3 or E3 Frame Indicator - Channel 2:
See Description for Pin E20
Power Supply +3.3v ± 5%
Ground
Receive Boundary of DS3 or E3 Frame Output Indicator - Channel
2:
See Description for Pin F20
Factory Test Pin:
The user should tie this pin to Ground.
Receive Loss of Signal Output Indicator - Channel 2:
See Description for Pin C4
Transmit AIS Command Input - Channel 2:
See Description for Pin B15
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