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SI53159-A01AGM Fiches technique(PDF) 7 Page - Silicon Laboratories

No de pièce SI53159-A01AGM
Description  PCI-EXPRESS GEN 1, GEN 2, & GEN 3 NINE OUTPUT FANOUT BUFFER
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Fabricant  SILABS [Silicon Laboratories]
Site Internet  http://www.silabs.com
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SI53159-A01AGM Fiches technique(HTML) 7 Page - Silicon Laboratories

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Si53159
Rev. 1.0
7
2. Functional Description
2.1. CKPWRGD/PDB (Power Down) Pin
The CKPWRGD/PDB pin is a dual-function pin. During initial power up, the pin functions as the CKPWRGD pin.
Upon the first power up, if the CKPWRGD pin is low, the outputs will be disabled, but the crystal oscillator and I2C
logics will be active. Once the CKPWRGD pin has been sampled high by the clock chip, the pin assumes a PDB
functionality. When the pin has assumed a PDB functionality and is pulled low, the device will be placed in power
down mode. The CKPWRGD/PDB pin is required to be driven at all times even though it has an internal 100 k
resistor.
2.2. PDB (Power Down) Assertion
The PDB pin is an asynchronous active low input used to disable all output clocks in a glitch-free manner. All
outputs will be driven low in power down mode. In power down mode, all outputs, the crystal oscillator, and the I2C
logic are disabled.
2.3. PDB Deassertion
When a valid rising edge on CKPWRGD/PDB pin is applied, all outputs are enabled in a glitch-free manner within
two to six output clock cycles.
2.4. OE Pin
The OE pin is an active high input used to enable and disable the output clock. To enable the output clock, the OE
pin and the I2C OE bit need to be a logic high. By default, the OE pin and the I2C OE bit are set to a logic high.
There are two methods to disable the output clock: the OE pin is pulled to a logic low, or the I2C OE bit is set to a
logic low. The OE pin is required to be driven at all times even though it has an internal 100 k
 resistor.
2.5. OE Assertion
The OE pin is an active high input used for synchronous stopping and starting the respective output clock while the
rest of the clock generator continues to function. The assertion of the OE function is achieved by pulling the OE pin
and the I2C OE bit high which causes the respective stopped output to resume normal operation. No short or
stretched clock pulses are produced when the clocks resume. The maximum latency from the assertion to active
outputs is no more than two to six output clock cycles.
2.6. OE Deassertion
The OE function is deasserted by pulling the pin or the I2C OE bit to a logic low. The corresponding output is
stopped cleanly and the final output state is driven low.


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