XR-T5793 Datasheet, PDF (6/16 Pages) Exar Corporation – Quad E1 Line Interface Unit

XR-T5793
PIN DESCRIPTION (CONT’D)
PLCC
Pin #
51
SQFP
Pin #
49
Symbol
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, 62
NC
61
63
TXEN2
62
64
TXEN1
63
65
TXOUT1
64
66
TV_DD
65
67
TV_SS
66
68
TXOUT2
67
69
AGND
68
70
TV_SS
Type
I
I
I
I
I
I
I
I
V_SS
I
NC
I
I
O
V_DD
V_SS
O
GND
V_SS
Description
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.
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.
No Charge.
Transmitter 2 Output Enable. If asserted the transmitter 2 output drivers are
enabled. High-Z otherwise.
Transmitter 1 Output Enable. If asserted the transmitter 1 output drivers are
enabled. High-Z otherwise.
Transmitter 1 Output. Transmitter 1 bipolar output connected to coupling
capacitor or pulse transformer through a resistor.
Transmit V_DD. +5V ($5%).
Transmit V_SS. -5V ($5%).
Transmitter 2 Output. Transmitter 2 bipolar output connected to coupling
capacitor or pulse transformer through a resistor.
Analog Ground.
Transmit V_SS. –5V ($5%).
Rev. 2.00
6