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XRT71D04IV Datasheet(PDF) 5 Page - Exar Corporation

Part # XRT71D04IV
Description  4 CHANNEL E3/DS3/STS-1 JITTER ATTENUATOR, STS-1 TO DS3 DESYNCHRONIZER
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT71D04IV Datasheet(HTML) 5 Page - Exar Corporation

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XRT71D04
4 CHANNEL E3/DS3/STS-1 JITTER ATTENUATOR, STS-1 TO DS3 DESYNCHRONIZER
REV. 1.1.1
4
12
MODE_CTRL
I
Mode Control:
When “High” in Multimode, all channels are independent. When “Low”, the Mas-
ter Channel (channel_0) controls DS3/E3_n, STS1_n, RCLKES, FSS and
MCLK_n. DJA is NOT affected.
Internal 50 K Ohm pull-up resistor.
13
ICT
I
In Circuit Testing Input. (Active low):
With this pin tied to ground, all output pins will be in high impedance mode for in-
circuit-testing.
For normal operation this input pin should be tied to VDD.
Internal 50 K Ohm pull-up resistor.
14
HOST
I
Host/Hardware Mode Select:
An active-high input enables the Host mode. Data is written to the command reg-
isters to configure the XRT71D04.
In the Host mode, the states of discrete input pins are inactive.
An active-low input enables the Hardware Mode.In this mode, the discrete inputs
are active.
Internal 50 K Ohm pull-down resistor.
15
FLRST
I
FIFO Limit Reset
Hardware Mode
Whenever the FIFO is within 2 bits of either underflow or overflow, the FL_n will
be set high.
This pin allows the user to reset the state of FL_n, (FIFO Limit) output pin.
This pin when pulsed “High”, resets the the FL_n output pin, (toggles to GND).
NOTE: The FL_n could be set “High” again if the FIFO is within 2 bits of either
underflow or overflow.
Host Mode
Reading the FL_n bits in the status registers clears this FL_n pin. Master Reset
also clears the FL_n output.
This pin is tied to GND. FLRST has no effect in this mode.
Internal 50 K Ohm pull-down resistor.
16
RRNEG_3
O
Received Recovered Negative Data (De-Jittered) Output - channel 3:
See description of pin 6
17
RRPOS_3
O
Received Positive Data (De-Jittered) Output - channel 3:
See description of pin 5
18
RRCLK_3
O
Received Recovered Output (De-jittered) Clock - channel 3:
See description of pin 4
19
GND
O
Digital Ground
20
AVDD
****
Analog Power Supply = 5V±5% or 3.3V±5%
21
AGND
****
Analog Ground
22
FL_0
O
FIFO Limit - channel 0:
This output pin is driven high whenever the internal FIFO comes within two-bits of
being either underflow or overflow.
PIN DESCRIPTION
PIN #NAME
TYPE
DESCRIPTION


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