XR-T5794 Datasheet, PDF (6/20 Pages) Exar Corporation – Quad E-1 Line Interface Unit

XR-T5794
PIN DESCRIPTION (CONT’D)
PLCC
Pin #
43
SQFP
Pin #
38
Symbol
LPMOD1
44
41, 42
RV_SS
45
43
RXNEG1
46
44
RXPOS1
47
45
RXNEG2
48
46
RXPOS2
49
47
V_SS
50
48
E1/T1-
51
49
LOOPEN1
52
50
LOOPEN2
53
51
TXNEG1
54
52
TXPOS1
55
53
TXCLK1
56
54
TXNEG2
57
55
TXPOS2
58
56
TXCLK2
59
57, 58,
59
AV_SS
60
60
LOSLVS
61
63
TXEN2
62
64
TXEN1
63
65
TXOUT1
64
66
TV_DD
65
67
TV_SS
Type
I
V_SS
O
O
O
O
V_SS
I
I
I
I
I
I
I
I
I
V_SS
Description
Loop Mode 1. Iif driven high the loopback mode of channel 1 will be set to re-
mote loop. Otherwise the loopback mode will remain at local loop. The actual
loopback will be activated when the LOOPEN1 is asserted.
Receive V_SS. -5V ($5%).
Receiver 1 Negative Data Out. Negative data output in NRZ or RZ format for
receiver 1.
Receiver 1 Positive Data Out. Positive data output in NRZ or RZ format for
receiver 1.
Receiver 2 Negative Data Out. Negative data output in NRZ or RZ format for
receiver 2.
Receiver 2 Positive Data Out. Positive data output in NRZ or RZ format for
receiver 2.
Digital V_SS. -5V ($5%).
E1/T1- Selection. Apply logic one to select the receive data threshold appropri-
ate for E1 operation. Connect to ground to select the T1 data threshold.
Loop Enable 1. If driven high the specified loopback mode will be enabled for
channel 1. Otherwise normal operation will continue.
Loop Enable 2. If driven high the specified loopback mode will be enabled for
channel 2. Otherwise normal operation will continue.
Transmitter 1 Negative Data In. Negative data input in NRZ or RZ format for
transmitter 1.
Transmitter 1 Positive Data In. Positive data input in NRZ or RZ format for
transmitter 1.
Transmitter 1 Clock Input. Apply logic one when RZ signals are supplied to
data inputs.
Transmitter 2 Negative Data In. Negative data input in NRZ or RZ format for
transmitter 2.
Transmitter 2 Positive Data In. Positive data input in NRZ or RZ format for
transmitter 2.
Transmitter 2 Clock Input. Apply logic one when RZ signals are supplied to
data inputs.
Analog V_SS.
I
Loss of Signal Voltage Select. Apply logic one to select LOS voltage level
appropriate for 120Ω balanced receiver operation. Connect to ground to
choose LOS voltage for 75Ω unbalanced operation.
I
Transmitter 2 Output Enable. If asserted the transmitter 2 output drivers are
enabled. High-Z otherwise.
I
Transmitter 1 Output Enable. If asserted the transmitter 1 output drivers are
enabled. High-Z otherwise.
O Transmitter 1 Output. Transmitter 1 bipolar output connected to coupling
capacitor or pulse transformer through a resistor.
V_DD Transmit V_DD. +5V ($5%).
V_SS Transmit V_SS. -5V ($5%).
Rev. 2.01
6