Datasheet

MAX5946
Dual PCI Express, Hot-Plug
Controller
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
12VIN
= V
12S_-
= V
12S_+
= 12V, V
3.3S_+
= V
3.3S_-
= V
3.3VAUXIN
= V
ON_
= V
AUXON_
= V
FON__
= 3.3V, PWRGD_ = FAULT_ = PORADJ
= TIM = OUTPUT_ = 12G_ = 3.3G_ = OPEN, INPUT_ = PRES_DET_ = PGND = GND, T
A
= -40°C to +85°C, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
PRES-DET_ High-to-Low
Deglitch Time
t
DEG
357ms
PORADJ = open
90 160 250
R
PORADJ
= 20kΩ
35 55 75
R
PORADJ
= 100kΩ
145 265 380
PWRGD_ Power-On Reset
Time (Note 2)
t
POR_HL
R
PORADJ
= 200kΩ
570
ms
PWRGD_ Low-to-High
Deglitch Time
t
POR_LH
4µs
Sinking 2mA
0.1
PWRGD_, FAULT_ Output
Low Voltage
Sinking 30mA
0.7
V
PWRGD_, FAULT_ Output-
High Leakage Current
V
PWRGD_
= V
FAULT_
= 5.5V 1 µA
TIM = open
5.5 11 17.0
R
TIM
= 15kΩ
1.4 2.6 3.8
R
TIM
= 120kΩ
12 22 32
FAULT_ Timeout t
FAULT
R
TIM
= 300kΩ
59
ms
FAULT_ Timeout During
Startup
t
SU
2 x t
FAULT
ms
Autorestart Delay Time t
RESTART
64 x t
FAULT
ms
Fault Reset Minimum Pulse
Width (Note 4)
t
RESET
100
µs
Thermal-Shutdown Threshold
T
SD
T
J
rising
+150
°C
Thermal-Shutdown Threshold
Hysteresis
20
°C
OUTPUT_ Debounce Time t
DBC
2.6 4.4 6.2
ms
OUTPUT_ High Voltage Sourcing 2mA
V
3.3VAUXIN
- 0.3
V
3.3 V AU X IN
V
OUTPUT_ Low Voltage Sinking 2mA
0.4
V
Note 1: 100% production tested at T
A
= +25°C. Parameters over temperature are guaranteed by design.
Note 2: PWRGD_ asserts a time t
POR_HL
after V
PGTH12
, V
PGTH3.3
, and V
PGTH3.3AUX
conditions are met.
Note 3: The UVLO for the 3.3V supply is sensed at 3.3SA+.
Note 4: This is the time that ON_ or AUXON_ must stay low when resetting a fault condition.