Rainbow-electronics MAX5958 Manual de usuario descargar pdf (Pagina 4)

MAX5957/MAX5958

Triple PCI Express, Hot-Plug Controllers

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

12VIN

= V

12S_+

= V

12S_-

= 12V, V

3.3S_+

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

= T

= -40°C to +85°C, unless otherwise

noted. Typical values are at T

= T

= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

PRES-DET_ High-to-Low Deglitch

Time

DEG

357ms

PORADJ

= GND 1 µs

PORADJ = unconnected 90 160 250

PORADJ

= 20kΩ 35 55 75

PORADJ

= 100kΩ 145 265 380

PWRGD_ Power-On Reset

Deglitch Time (Note 2)

POR_HL

PORADJ

= 200kΩ 530

PWRGD_ Low-to-High Deglitch

Time

POR_LH

4µs

SINK

= 2mA 0.1

PWRGD_, FAULT_ Output Low

Voltage

SINK

= 30mA 0.8

PWRGD_, FAULT_ Output High

Leakage Current

PWRGD_, FAULT_ = 5.5V 1 µA

TIM = open 5.5 11 17

TIM

= 15kΩ 1.4 2.6 3.8

TIM

= 120kΩ 12 22 32

FAULT_ Timeout t

FAULT

TIM

= 300kΩ 53

FAULT_ Timeout During Startup t

2 x

FAULT

Autorestart Delay Time t

RESTART

64 x

FAULT

Fault Reset Minimum Pulse Width t

RESET

(Note 4) 100 µs

Thermal Shutdown Threshold t

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

3.3 AU X IN

- 0.3

3.3 AU X IN

OUT_ Voltage Low I

SINK

= 2mA 0.4 V

Note 1: All devices are 100% production tested at T

= +25°C. Limits over temperature are guaranteed by design.

Note 2: PWRGD_ asserts a time t

POR_HL

after V

PGTH12,

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.

1 2 3 4 5 6 7 8 9 ... 24 25

MAX5957/MAX5958 1

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Rainbow-electronics MAX5958 Manual de usuario Pagina 4

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