XRT83SL38 Datasheet, PDF (19/89 Pages) Exar Corporation – OCTAL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

XRT83SL38
OCTAL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
PRELIMINARY
REV. P1.1.0
ALARM FUNCTIONS/REDUNDANCY SUPPORT
SIGNAL NAME
TQFP
PIN #
BGA
LEAD #
TYPE
DESCRIPTION
GAUGE
134 J18
I Twisted Pair Cable Wire Gauge Select - Hardware Mode
Connect this pin “High” to select 26 Gauge wire. Connect this pin “Low” to
select 22 and 24 gauge wire for all channels.
NOTE: Internally pulled “Low” with a 50kΩ resistor.
DMO_0
DMO_1
DMO_2
DMO_3
DMO_4
DMO_5
DMO_6
DMO_7
199
D5
10
D4
147 C15
166 C13
62
R5
43
P4
114 U17
95
V14
O Driver Failure Monitor Channel _0:
This pin transitions “High” if a short circuit condition is detected in the transmit
driver of Channel _0, or no transmit output pulse is detected for more than 128
TCLK_0 cycles.
Driver Failure Monitor Channel _1
Driver Failure Monitor Channel _2
Driver Failure Monitor Channel _3
Driver Failure Monitor Channel _4
Driver Failure Monitor Channel _5
Driver Failure Monitor Channel _6
Driver Failure Monitor Channel _7
ATAOS
µPCLK
94
T13
T13
I Automatic Transmit “All Ones” Pattern - Hardware Mode
A "High" level on this pin enables the automatic transmission of an "All Ones"
AMI pattern from the transmitter of any channel that the receiver of that chan-
nel has detected an LOS condition. A "Low" level on this pin disables this func-
tion.
Note: All channels share the same ATAOS control function.
Microprocessor Clock Input - Host mode
See “Microprocessor Clock Input - Host Mode:” on page 13.
NOTE: This pin is internally pulled “Low” for asynchronous microprocessor
interface when no clock is present.
TRATIO
INT
127 L16
L16
I Transmitter Transformer Ratio Select - Hardware mode
In external termination mode (TXTSEL = 0), setting this pin “High” selects a
transformer ratio of 1:2 for the transmitter. A “Low” on this pin sets the trans-
mitter transformer ratio to 1:2.45. In the internal termination mode the trans-
mitter transformer ratio is permanently set to 1:2 and the state of this pin is
ignored.
Interrupt Output - Host mode
O _{This pin is asserted “Low” to indicate an alarm condition. See “Interrupt Output}
- Host mode” on page 13.
NOTE: This pin is an open drain output and requires an external 10kΩ pull-up
resistor.
RESET
75
T8
I Hardware Reset (Active “Low”):
When this pin is tied “Low” for more than 10µs, the device is put in the reset
state.
NOTE: This pin is internally pulled “High” with a 50kΩ resistor.
SR/DR
30
K4
I Single-Rail/Dual-Rail Data Format:
Connect this pin “Low” to select transmit and receive data format in Dual-Rail
mode. In this mode, HDB3 or B8ZS encoder and decoder are not available.
Connect this pin “High” to select single-rail data format.
NOTE: Internally pulled “Low” with a 50kΩ resistor.
16