LTC4266 LINER [Linear Technology], LTC4266 Datasheet - Page 5

• Manufacturer Part Number: LTC4266
• Description: Quad IEEE 802.3at Power over Ethernet Controller
• Manufacturer: LINER [Linear Technology]

SYMBOL
Timing Characteristics
t
t
t
t
t
t
t
t
t
t
t
t
t
t
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
otherwise noted. (Notes 3, 4)
DET
DETDLY
CLE1
ME1
CLE2
ME2
CLE3
PON
START
LIM
MPS
DIS
MSD
SHDN
, t
ICUT
PARAMETER
Detection Time
Detection Delay
First Class Event Duration
First Mark Event Duration
Second Class Event Duration
Second Mark Event Duration
Third Class Event Duration
Power On Delay in AUTO pin mode
Turn On Rise Time
Turn On Ramp Rate
Fault Delay
Midspan Mode Detection Backoff
Power Removal Detection Delay
Maximum Current Limit Duration During Port
Start-Up
Maximum Current Limit Duration After Port
Start-Up
Maximum Current Limit Duty Cycle
Maintain Power Signature (MPS) Pulse Width
Sensitivity
Maintain Power Signature (MPS) Dropout
Time
Masked Shut Down Delay
Port Shut Down Delay
I
Minimum Pulse Width for Masked Shut
Down
Minimum Pulse Width for SHDN
Minimum Pulse Width for RESET
2
C Watchdog Timer Duration
A
CONDITIONS
Beginning to End of Detection (Note 7)
From PD Connected to Port to Detection
Complete (Note 7)
(Note 7)
(Notes 7, 11)
(Note 7)
(Note 7)
C
From End of Valid Detect to Application of
Power to Port (Note 7)
(AGND – V
(AGND – V
C
From I
Rport = 15.5kΩ (Note 7)
From Power Removal After t
Detect (Note 7)
t
t
(Note 7)
Current Pulse Width to Reset Disconnect
Timer (Notes 7, 8)
t
(Note 7)
(Note 7)
(Note 7)
(Note 7)
(Note 7)
= 25°C. AGND – V
START1
ICUT1
conf
PORT
PORT
[1:0] = 00b (Notes 5, 12)
= 0, t
= 0.6µF (Note 7)
= 0.15µF (Note 7)
CUT
The
= 0, t
Fault to Next Detect
OUT
EE
ICUT0
l
), C
START0
): 10% to 90% of
denotes the specifications which apply over the full operating
PORT
= 0 (Notes 7, 12)
= 0 (Notes 7, 12)
EE
= 0.15µF (Note 7)
= 54V, AGND = DGND, and V
DIS
to Next
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
270
300
320
6.8
1.0
2.3
1.0
5.8
1.6
1.5
4.5
11
11
19
15
52
52
3
3
DD
– DGND = 3.3V unless
62.5
62.5
TYP
290
350
8.6
1.1
2.5
1.3
6.3
12
12
22
24
2
LTC4266
MAX
10.3
310
470
380
0.1
2.7
2.5
6.7
3.6
6.5
6.5
13
13
60
10
66
66
3
UNITS
4266fb
5
V/µs
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
µs
µs
µs
µs
µs
µs
%
s
s
s
s