XRT81L27 Datasheet, PDF (6/30 Pages) Exar Corporation – SEVEN CHANNEL E1 LINE INTERFACE UNIT WITH CLOCK RECOVERY

XRT81L27
SEVEN CHANNEL E1 LINE INTERFACE UNIT WITH CLOCK RECOVERY
REV. 1.1.0
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PIN DESCRIPTIONS
NOTE: I -H indicates an input pin with a 50kΩ pull-up Resistor, I-L indicates an input pin with a 50kΩ pull-down resistor.
PIN #
26
27
28
29
30
31
32
NAME
TGND_4
PDTx_6
TTIP_6
TVDD_6
TRING_6
TGND_6
MODE
33
RClk_4
34
RNEG_4
LCV_4
35
RPOS_4
RDATA_4
36
LOS_4
37
TClk_4
38
TPOS_4
TDATA_4
39
TNEG_4
TYPE
Gnd
I-H
O
Vdd
O
Gnd
I-L
O
O
O
O
I
I
I-L
DESCRIPTION
Transmitter 4 Supply Ground
Power-down Transmitter 6: (see pin 6)
Transmitter 6 Tip Output: Positive bipolar data output to the line.
Transmitter 6 Positive Supply(3.3V± 5%)
Transmitter 6 Ring Output: Negative bipolar data output to the line.
Transmitter 6 Supply Ground
Mode Control Input:
This pin is used to select Hardware or Host Mode control of the device.
Tie “Low” to select Host Mode
"High" to select Hardware Mode.
Receiver 4 Clock Output:
Receiver 4 Negative Data Output:
In Dual-Rail mode, this signal is the receive n-rail output data.
Line Code Violation Output:
In Single-Rail mode, this signal outputs a "High" for one clock cycle to
indicate a code violation is detected in the received data.
If AMI coding is selected, every bipolar violation received will cause this
pin to go "High".
Receiver 4 Positive Data Output:
In Dual-Rail mode, this signal is the receive p-rail output data.
Receiver 4 NRZ Data Output:
In Single-Rail mode, this signal is the receive output data
Receiver 4 Loss of Signal: (see pin 2)
Transmitter 4 Clock Input: E1 rate at 2.048MHz ± 50ppm.
Transmitter 4 Positive Data Input:
In Dual-Rail mode, this signal is the p-rail input data for transmitter 4.
Transmitter 4 NRZ Data Input:
In Single-Rail mode, this signal is used as the NRZ input data
Transmitter 4 Negative Data Input:
In Dual-Rail mode, this signal is the n-rail data input for transmitter 4.
CODE_4
40
TAOS_4
41
VDD
42
GND
In Single-Rail mode (pin 69=1) and with this pin tied "High", input data
at the transmit input is encoded in HDB3 format and the substitution
code in the corresponding receive channel will be removed.
Tie this pin "Low" to enable AMI encoding and decoding.
I-L
Transmit All Ones Channel_4:
This pin is set to insert AMI all ones data to the line using MCLK as refer-
ence.
In Host Mode, this pin can be left unconnected.
Vdd
Digital Positive Supply(3.3V± 5%).
Gnd
Digital Supply Ground.
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