DS125RT410 Datasheet, PDF (15/42 Pages) Texas Instruments – DS125RT410 Low Power Multi-Rate Quad Channel Retimer

DS125RT410
www.ti.com
SNLS459 – APRIL 2011
The DS125RT410 can be configured to operate with a nominal rise/fall time corresponding to the maximum slew
rate of the output drivers into the load capacitance. Alternatively, the DS125RT410 can be configured to operate
with a slightly greater rise/fall time if desired. For the typical specifications on rise/fall time, see Electrical
Characteristics
INT
The INT line is an open-drain, 3.3V tolerant, LVCMOS active-low output. The INT lines from multiple
DS125RT410s can be wired together and connected to an external controller.
The Horizontal Eye Opening/Vertical Eye Opening (HEO/VEO) interrupt can be enabled using SMBus control for
each channel independently. This interrupt is disabled by default. The thresholds for horizontal and vertical eye
opening that will trigger the interrupt can be set using the SMBus control for each channel.
If any interrupt occurs, registers in the DS125RT410 latch in information about the event that caused the
interrupt. This can then be read out by the controller over the SMBus.
LOCK_3, LOCK_2, LOCK_1, and LOCK_0
Each channel of the DS125RT410 has an independent lock indication pin. These lock indication pins, LOCK_3,
LOCK_2, LOCK_1, and LOCK_0, are pin 16, pin 21, pin 40, and pin 45 respectively. These pins are shared with
the SMBus address strap lines. After the address values have been latched in on power-up, these lines revert to
their lock indication function.
When the corresponding channel of the DS125RT410 is locked to the incoming data stream, the lock indication
pin goes high. This pin can be used to drive an LED on the board, giving a visual indication of the lock status, or
it can be connected to other circuitry which can interpret the lock status of the channel.
Copyright © 2011, Texas Instruments Incorporated
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