SI3461 Silicon Laboratories, SI3461 Datasheet - Page 9

• Manufacturer Part Number: SI3461
• Description: SINGLE-PORT IEEE 802.3AT POE/POE PSE INTERFACE
• Manufacturer: Silicon Laboratories

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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.
Description
Endpoint Detection
Delay Cycle
Detection Time
Classification Delay
Cycle
Classification Time
Power-Up Turn-On
Delay
Midspan Detect Back-
off Time
Error Delay Time
Disconnect Delay
Note: These typical specifications are based on an ambient operating temperature of 25 °C and V
t
CLASS_CYCLE
t
DET_CYCLE
Symbol
t
t
t
DETECT
t
PWRUP
DC_DIS
CLASS
t
BOM
T
ed
Time from when a valid detection is
Time from when a valid detection is
Time from PD connection to port to
Time from successful detect mode
Time from successful detect mode
Time from error to restart of detec-
Class 4, two event classification;
completion of detection process.
Table 5. PSE Timing
Class 0/1/2/3 and Class 4 PoE;
Class 0/1/2/3 and Class 4 PoE;
completed until V
completed until V
Time required to measure PD
to classification complete.
to classification complete.
tion in auto-restart mode.
signature resistance.
Test Conditions
Rev. 1.0
Class 4 PoE+;
Class 0/1/2/3;
Class 4 PoE+
applied
applied
OUT
OUT
power is
power is
Min
2.0
2.0
90
—
—
—
—
—
—
—
—
IN
Typ
112
350
90
60
99
30
69
76
= +50 V.
—
—
—
Si3461
Max
460
—
—
—
—
—
—
—
—
—
—
Unit
ms
ms
ms
ms
ms
ms
ms
ms
ms
s
s
9
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