Startup
The main supply outputs can become active only after
all the following events have occurred:
" V
3.3VAUXIN
is above its UVLO threshold
" V
12VIN
and V
3.3SA+
are both above their UVLO
threshold
" ON_ is driven high
" PRES-DET_ is low for more than 4ms
The auxiliary supply output is made available only after
the following events have occurred:
" V
3.3VAUXIN
is above its UVLO threshold
" AUXON_ is driven high
" PRES-DET_ is low for more than 4ms
The FON_ input overrides all other control signals and
turns on the respective slot when driven low, as long as
the UVLO thresholds have been reached. Table 2 sum-
marizes the logic conditions required for startup.
The auxiliary supply input powers the internal control
logic and analog references of the MAX5946, so the
main supplies cannot be enabled if V
3.3VAUXIN
is not
present.
When an output is enabled, a programmable startup
timer (t
SU
) begins to count the startup time duration.
The value of t
SU
is set to 2x the fault timeout period
(t
FAULT
). R
TIM
externally connected from TIM to GND
sets the duration of t
FAULT
.
Dual PCI Express, Hot-Plug
Controller
______________________________________________________________________________________ 15
Table 1. Power Requirements for PCI Express Connectors
POWER RAIL
X1 CONNECTOR
X4/8 CONNECTOR
X16 CONNECTOR
3.3V
Voltage Tolerance
?% (max)
?% (max)
?% (max)
Supply Current
3.0A (max)
3.0A (max)
3.0A (max)
Capacitive Load
1000礔 (max)
1000礔 (max)
1000礔 (max)
12V
Voltage Tolerance
?% (max)
?% (max)
?% (max)
Supply Current
0.5A (max)
2.1A (max)
5.5A (max)
Capacitive Load
300礔 (max)
1000礔 (max)
2000礔 (max)
3.3V AUXILIARY
Voltage Tolerance
?% (max)
?% (max)
?% (max)
Supply Current,
Wake Enabled
375mA (max)
375mA (max)
375mA (max)
Supply Current, Non-Wake
Enabled
20mA (max)
20mA (max)
20mA (max)
Capacitive Load
150礔 (max)
150礔 (max)
150礔 (max)
Table 2. Control Logic Truth Table
ON_
AUXON_
FON_
PRES-DET_
12V_ AND 3.3V_
OUTPUTS
3.3VAUXO_
AUXILIARY
OUTPUTS
X
X
Low
X
On
On
X
X
High
High
Off
Off
Low
Low
High
Low*
Off
Off
High
Low
High
Low*
On
Off
Low
High
High
Low*
Off
On
Hi h
Hi h
Hi h
Low*
On
On
*PRES-DET_ high-to-low transition has a 4ms delay (t
DEG
).
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