LTC4270/LTC4271
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. AGND – VEE = 54V and VDD – DGND = 3.3V unless otherwise noted.
(Notes 3 & 4)
SYMBOL PARAMETER
XIO
CONDITIONS
MIN
TYP
MAX
UNITS
l
l
l
l
V
V
XIO Digital Output Low
V
V
V
V
– V , I = 5mA
EE XIOn
0.7
V
V
OLX
OHX
XIOn
XIOn
XIOn
XIOn
XIO Digital Output High
– V , I
= 100µA
3.5
3.4
EE XIOn
XIO Digital Input Low Voltage
XIO Digital Input High Voltage
Internal Pull Up to CAP2
– V
– V
0.8
V
EE
EE
V
XIO0, XIO1
50
kΩ
PSE Timing Characteristics
t
t
t
t
t
t
Detection Time
Beginning To End of Detection (Note 7)
(Note 7)
220
12
ms
ms
ms
ms
ms
ms
DET
Class Event Duration
Class Event Turn On Duration
Mark Event Duration
Last Mark Event Duration
CLE
l
C
= 0.6µF (Note 7)
PORT
0.1
60
CLEON
ME
(Note 7, Note 11)
(Note 7, Note 11)
8.6
22
l
l
16
15
MEL
PON
Power On Delay in AUTO Pin Mode From End of Valid Detect to Application of Power to Port
(Note 7)
l
Turn-On Rise Time
(AGND – V ): 10% to 90% of (AGND - V ) C
=
24
µs
OUT
EE PORT
0.15µF (Note 7)
l
l
l
Turn-On Ramp Rate
Turn-On Class Transition
Fault Delay
C
C
= 0.15µF (Note 7)
= 0.15µF (Note 7)
10
V/µs
ms
s
PORT
PORT
t
t
0.1
TOCL
ED
From I
or I Fault to Next Detect
1.0
1.1
CUT
LIM
(Note 7)
l
l
l
Midspan Mode Detection Backoff
Power Removal Detection Delay
R
= 15.5kΩ (Note 7)
2.3
1.0
52
2.5
1.3
59
2.7
2.5
66
s
s
PORT
From Power Removal After t to Next Detect (Note 7)
DIS
t
t
Maximum Current Limit Duration (Note 7)
During Port Start-Up
ms
START
CUT
l
Maximum Overcurrent Duration
After Port Start-Up
(Note 7)
52
59
66
ms
l
l
Maximum Overcurrent Duty Cycle (Note 7)
5.8
10
6.3
12
6.7
14
%
t
Maximum Current Limit Duration
t
= 1 (Note 7, Note 12)
ms
LIM
LIM
After Port Start-Up – t Enabled
LIM
l
l
l
Maximum Current Limit Duration
t
= 0 (Note 7, Note 12)
52
1.6
320
59
66
3.6
380
ms
ms
ms
LIM
After Port Start-Up – t as t
LIM
CUT
t
t
t
Maintain Power Signature (MPS)
Pulse Width Sensitivity
Current Pulse Width to Reset Disconnect Timer (Note 7,
Note 8)
MPS
DIS
Maintain Power Signature (MPS)
Dropout Time
(Note 7, Note 5)
350
2
Masked Shut Down Delay
(Note 7)
(Note 7)
6.5
3
µs
s
MSD
2
l
l
I C Watchdog Timer Duration
1.5
3
Minimum Pulse Width for Masked (Note 7)
Shut Down
µs
l
Minimum Pulse Width for RESET (Note 7)
4.5
µs
Rev E
6
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