Rainbow Electronics MAX5958 - Manual (Page 4)

MAX5957/MAX5958
Triple PCI Express, Hot-Plug Controllers
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V 12VIN = V 12S_+ = V 12S_- = 12V, V 3.3S_+ =V 3.3S_- = V 3.3AUXIN = V ON_ = V AUXON_ = V FON_ = 3.3V, PWRGD_ = FAULT_ = PORADJ =
TIM = OUTPUT_ = 12G_ = 3.3G_ = OPEN, INPUT_ = PRES-DET_ = PGND = GND, T A = T J = -40°C to +85°C, unless otherwise
noted. Typical values are at T A = T J = +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
PRES-DET_ High-to-Low Deglitch
Time
t DEG 3 5 7 ms
V PORADJ = GND 1 µs
PORADJ = unconnected 90 160 250
R PORADJ = 20k Ω 35 55 75
R PORADJ = 100k Ω 145 265 380
PWRGD_ Power-On Reset
Deglitch Time (Note 2)
t POR_HL
R PORADJ = 200k Ω 530
ms
PWRGD_ Low-to-High Deglitch
Time
t POR_LH 4 µs
I SINK = 2mA 0.1 PWRGD_, FAULT_ Output Low
Voltage
I SINK = 30mA 0.8
V
PWRGD_, FAULT_ Output High
Leakage Current
PWRGD_, FAULT_ = 5.5V 1 µA
TIM = open 5.5 11 17
R TIM = 15k Ω 1.4 2.6 3.8
R TIM = 120k Ω 12 22 32
FAULT_ Timeout t FAULT
R TIM = 300k Ω 53
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 t RESET (Note 4) 100 µs
Thermal Shutdown Threshold t SD T J rising 150
Thermal Shutdown Hysteresis 20
°C
OUT_ Debounce Time t DBC 2.6 4.4 6.2 ms
OUT_ Voltage High I SOURCE = 2mA
V 3.3 AU X IN
- 0.3
V 3.3 AU X IN V
OUT_ Voltage Low I SINK = 2mA 0.4 V
Note 1: All devices are 100% production tested at T
A
= +25°C. Limits 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 3.3S_+.
Note 4: This is the time that ON_ or AUXON_ must stay low when resetting a fault condition.