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Si3461-KIT Datasheet(PDF) 9 Page - Silicon Laboratories

Part # Si3461-KIT
Description  SINGLE-PORT IEEE 802.3AT POE/POE PSE INTERFACE
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
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Si3461-KIT Datasheet(HTML) 9 Page - Silicon Laboratories

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Si3461
Rev. 1.0
9
2.2. PSE Timing Characteristics
When implemented in accordance with the recommended external components and layout guidelines, the Si3461
controller enables the following typical performance characteristics in single-port PSE applications. Refer to the
Si3461-EVB applications note, schematics, and user's guide for more details.
Table 5. PSE Timing
Description
Symbol
Test Conditions
Min
Typ
Max
Unit
Endpoint Detection
Delay Cycle
tDET_CYCLE
Time from PD connection to port to
completion of detection process.
90
460
ms
Detection Time
tDETECT
Time required to measure PD
signature resistance.
90
ms
Classification Delay
Cycle
tCLASS_CYCLE
Class 0/1/2/3;
Time from successful detect mode
to classification complete.
60
ms
Class 4, two event classification;
Time from successful detect mode
to classification complete.
99
ms
Classification Time
tCLASS
Class 0/1/2/3 and Class 4 PoE;
30
ms
Class 4 PoE+
69
ms
Power-Up Turn-On
Delay
tPWRUP
Class 0/1/2/3 and Class 4 PoE;
Time from when a valid detection is
completed until VOUT power is
applied
76
ms
Class 4 PoE+;
Time from when a valid detection is
completed until VOUT power is
applied
112
ms
Midspan Detect Back-
off Time
tBOM
2.0
s
Error Delay Time
Ted
Time from error to restart of detec-
tion in auto-restart mode.
2.0
s
Disconnect Delay
tDC_DIS
350
ms
Note: These typical specifications are based on an ambient operating temperature of 25 °C and VIN =+50 V.


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