I/O Channel Budget; Pfail - HP Vectra Reference Manual

I/O Channel Budget
Each of the I/O channels can support an average of seven watts
per channel. The following charts the power totals not to be
exceeded for the I/O backplane slots.
+
5V 7200ma
+
12V 390ma
- 5V 250ma
-12· 250ma
PFAIL
The PFAIL signal indicates all power supply is valid within 100
msec after supplies are valid. The falling edge of PFAIL indicates to
the CMOS clock to go into power-down mode and operate from
the battery pack. PFAIL generates a reset to the system via an
interrupt control. The following figure is a timing diagram of the
PFAIL signal.
PFAIL Timing Diagram
___ o.ov
PFAIL
U
OPEN
U
COLLECTOR
_0.6 MAX
T1: 100 msee MIN/300 msee MAX
T2: 100 usee MIN
RISE & FALL TIMES (10%-90%) 1 usee TYP
Figure 17
78 Power Supply