XRT83L30 Datasheet, PDF (14/78 Pages) Exar Corporation – SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

XRT83L30
áç
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. P1.3.0
PRELIMINARY
REDUNDANCY SUPPORT
SIGNAL NAME
DMO
PIN #
11
TYPE
O
DESCRIPTION
Driver Failure Monitor
This pin transitions "High" if a short circuit condition is detected in the trans-
mit driver, or no transmit output pulse is detected for more than 128 TCLK
cycles.
TERMINATIONS
SIGNAL NAME
GAUGE
TRATIO
RXTSEL
PIN #
49
26
44
TYPE
I
I
I
DESCRIPTION
Twisted Pair Cable Wire Gauge Select
In Hardware mode, connect this pin "High" to select 26 Gauge wire. Connect
this pin “Low” to select 22 and 24 gauge wire.
NOTE: Internally pulled “Low” with a 50kΩ resistor.
Transmitter Transformer Ratio Select
In external termination mode, setting this pin "High" selects a transformer
ratio of 1:2 for the transmitter. A "Low" on this pin sets the transmitter trans-
former ratio to 1:2.45. In the internal termination mode the transmitter trans-
former ratio is permanently set to 1:2 and the state of this pin is ignored.
NOTE: Internally pulled "Low" with a 50kΩ resistor.
Receiver Termination Select
In Hardware mode when this pin is “Low” the receive line termination is
determined only by the external resistor. When “High”, the receive termina-
tion is realized by internal resistors or the combination of internal and exter-
nal resistors according to RXRES[1:0]. These conditions are described in the
following table:
TXTSEL
RXTSEL
0
1
RX Termination
External
Internal
NOTE: This pin is internally pulled "Low" with a 50kΩ resistor.
45
I
Transmit Termination Select
In Hardware mode when this pin is “Low” the transmit line termination is
determined only by external resistor. When “High”, the transmit termination is
realized only by an internal resistor. These conditions are summarized in the
following table:
TXTSEL
0
1
TX Termination
External
Internal
NOTE: This pin is internally pulled "Low" with a 50kΩ resistor.
11