XRT81L27 Datasheet, PDF (5/30 Pages) Exar Corporation – SEVEN CHANNEL E1 LINE INTERFACE UNIT WITH CLOCK RECOVERY

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XRT81L27
SEVEN CHANNEL E1 LINE INTERFACE UNIT WITH CLOCK RECOVERY
REV. 1.1.0
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 #
NAME
TYPE
DESCRIPTION
1
RClk_0
2
LOS_0
3
RST
LBEN
4
RTIP_0
5
RRING_0
6
PDTx_0
7
TTIP_0
8
TVDD_0
9
TRING_0
10
TGND_0
11
PDTx_2
12
TTIP_2
13
TVDD_2
14
TRING_2
15
TGND_2
16
AVDD
17
RTIP_2
18
RRING_2
19
AGND
20
RTIP_4
21
RRING_4
22
PDTx_4
23
TTIP_4
24
TVDD_4
25
TRING_4
O
O
I-H
I
I
I-H
O
Vdd
O
Gnd
I-H
O
Vdd
O
Gnd
AVdd
I
I
Gnd
I
I
I-H
O
Vdd
O
Receiver 0 Clock Output
Receiver 0 Loss of Signal:
This signal is asserted "High" to indicate loss of signal at the receive
input.
Reset (Active-low): (Host Mode)
“Low” Resets the register contents to zero.
Loop-back Enable (Active-low): (Hardware Mode)
“Low” for Loop-back mode enable.
Receiver 0 Bipolar Positive Input:
Receiver 0 Bipolar Negative Input:
Power-down Transmitter 0:
This pin is operational for both Host or Hardware Mode.
This pin MUST be pulled “Low” to enable TTIP_0 and TRING_0 output
buffers.
Pull this pin "High" to power-down channel 0 transmitter and set TTIP_0
and TRING_0 outputs to high impedance.
Transmitter 0 Tip Output: Positive bipolar data output to the line
Transmitter 0 Positive Supply (3.3V± 5%)
Transmitter 0 Ring Output: Negative bipolar data output to the line.
Transmitter 0 Supply Ground
Power-down Transmitter 2: (see pin 6)
Transmitter 2 Tip Output: Positive bipolar data output to the line.
Transmitter 2 Positive Supply(3.3V± 5%)
Transmitter 2 Ring Output: Negative bipolar data output to the line.
Transmitter 2 Supply Ground.
Analog Positive Supply(3.3V± 5%)
Receiver 2 Bipolar Positive Input:
Receiver 2 Bipolar Negative Input:
Analog Supply Ground.
Receiver 4 Bipolar Positive Input:
Receiver 4 Bipolar Negative Input:
Power-down Transmitter 4: (see pin 6)
Transmitter 4 Tip Output: Positive bipolar data output to the line.
Transmitter 4 Positive Supply(3.3V± 5%)
Transmitter 4 Ring Output: Negative bipolar data output to the line.
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