MAX5945
Quad Network Power Controller
for Power-Over-LAN
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(AGND = +32V to +60V, V
EE
= 0V, V
DD
to DGND = +3.3V, all voltages are referenced to V
EE
, unless otherwise noted. Typical
values are at AGND = +48V, DGND = +48V, V
DD
= (DGND + 3.3V), T
A
= +25°C. Currents are positive when entering the pin and
negative otherwise.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Internal Input Pullup/Pulldown
Resistor
R
DIN
Pullup (pulldown) resistor to V
DD
(DGND) to set
default level
25 50 75 kΩ
Open-Drain Output Low
Voltage
V
OL
I
SINK
= 15mA 0.4 V
Open-Drain Leakage I
OL
Open-drain high impedance, V
O
= 3.3V 2 µA
TIMING
Startup Time t
START
Time during which a current limit set by V
SU_LIM
is allowed, starts when the GATE_
is turned on (Note 8)
50 60 70 ms
Fault Time t
FAULT
Maximum allowed time for an overcurrent
condition set by V
FLT_LIM
after startup (Note 8)
50 60 70 ms
Port Turn-Off Time t
OFF
Minimum delay between any port turning off,
does not apply in the case of a reset
0.5 0.75 1.0 ms
Detection Time t
DET
Maximum time allowed before detection
is completed
320 ms
Midspan Mode Detection
Delay
t
DMID
2.0 2.4 s
Classification Time t
CLASS
Time allowed for classification 40 ms
V
EEUVLO
Turn-On Delay t
DLY
Time V
AGND
must be above the V
EEUVLO
thresholds before the device operates
24ms
RSTR bits = 00
16 x
t
FAULT
RSTR bits = 01
32 x
t
FAULT
RSTR bits = 10
64 x
t
FAULT
Restart Timer t
RESTART
Ti m e a p or t has to w ai t
b efor e tur ni ng on after an
over cur r ent faul t,
RS TR_E N b i t = hi g h
RSTR bits = 11 0
ms
Watchdog Clock Period t
WD
Rate of decrement of the watchdog timer 164 ms
TIMING CHARACTERISTICS for 2-WIRE FAST MODE (Figures 5 and 6)
Serial Clock Frequency f
SCL
(Note 9) 400 kHz
Bus Free Time Between a
STOP and a START Condition
t
BUF
(Note 9) 1.2 µs
Hold Time for Start Condition t
HD
STA
(Note 9) 0.6 µs
Low Period of the SCL Clock t
LOW
(Note 9) 1.2 µs
High Period of the SCL Clock t
HIGH
(Note 9) 0.6 µs
(16 Seiten)
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