XRT83SL30IV(2003) View Datasheet(PDF) - Exar Corporation
Part Name
Description
Manufacturer
XRT83SL30IV
(Rev.:2003)
(Rev.:2003)
Exar Corporation
XRT83SL30IV Datasheet PDF : 76 Pages
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XRT83SL30
SINGLE-CHANNEL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
PRELIMINARY
REV. P1.0.4
SIGNAL NAME
TERSEL1
TERSEL0
PIN #
43
42
TYPE
DESCRIPTION
I Termination Impedance Select pin 1
Termination Impedance Select pin 0
In the Hardware Mode and in the Internal Termination mode (TXTSEL=”1” and/or RXT-
SEL=”1”) TERSEL[1:0] control the transmit and receive termination impedance accord-
ing to the following table:
TERSEL1 TERSEL0
0
0
0
1
1
0
1
1
Termination
100Ω
110Ω
75 Ω
120Ω
In the Internal Termination mode, the receive termination is realized completely by inter-
nal resistors or the combination of internal and one fixed external resistor (see descrip-
tion for RXRES[1:0] pins). In the internal termination mode the transformer ratio of 1:2
and 1:1 is required for the transmitter and receiver respectively with the transmitter out-
put AC coupled to the transformer.
NOTE: This pin is internally pulled "Low" with a 50kΩ resistor.
RXRES1
51
I Receive External Resistor Control pin 1
RXRES0
52
Receive External Resistor Control pin 0
In Hardware Mode, RXRES[1:0] pins selects the required value of the external fixed
resistor for the receiver according to the following table. This mode is only available in
the internal impedance mode by pulling RXTSEL “High”.
RXRES1 RXRES0
RX Fixed Resistor
0
0
No External Fixed Resistor
0
1
240Ω
1
0
210Ω
1
1
150Ω
NOTE: Internally pulled “Low” with 50kΩ resistor.
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