Table 2. control logic truth table – Rainbow Electronics MAX5960 User Manual
Page 17
MAX5959/MAX5960
Quad PCI Express, Hot-Plug Controllers
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17
Table 2. Control Logic Truth Table
*
PRES-DET_ high-to-low transition has a 4ms delay (t
DEG
).
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
High
High
High
Low*
On
On
Figure 2. Power-Up Timing, No Fault
V
ON_,TH
ON_, AUXON_
PWRGD_
FAULT_
12G_, 3.3G_
12VO_, 3.3VO_
3.3VAUXO_
V
PGTH12
V
PGTH3.3
V
PGTH3.3AUX
3.3AUXIN
RISING
EDGE
PWRGD_ IS PULLED UP TO 3.3.
FAULT_ IS PULLED UP TO 3.3AUXIN.
t
POR_HL
Figure 3. 12V Power-Up Timing (Turn-On into Output
Overcurrent/Short Circuit)
FAULT_
3.3VAUXIN
RISING
EDGE
PWRGD_ IS PULLED UP TO 3.3VAUXO_.
FAULT_ IS PULLED UP TO 3.3VAUXIN.
A FAULT ON THE 3.3V OUTPUT OR 3.3VAUXO_ OUTPUT PRODUCES SIMILAR RESULTS.
V
ON_,TH
ON_
2 x t
FAULT
PWRGD_
12G_
12V OUTPUT
CURRENT
3.3VAUXO_
V
12ILIM,TH
R
SENSE