Specifications

PC/II+p Board Technical Reference Manual 23
MT002615 ©1999-2001, Megatel Computer Corporation
5 Electrical Specifications
The PC/II+p operates on a single +5V ± 5% supply. Power is supplied to the board through J907, the +5V
Power Connector. On-board power requirements at +3.3V, +2.5V and VCPUCORE are generated on-board,
using regulators (dual switching supplies provide +3.3V and VCPUCORE voltages). The board contains a
split power plane, two dedicated power planes, and a dedicated ground plane. A power supervisor with a
dual voltage monitor controls on-board RESET (POWERGOOD) signals during power ramp states.
The PC/II+p board sources +5V to the PC/104 bus. Other PC/104 bus voltages (-5v, +12v and -12v) are not
connected from the bus to the board.
The PC/II+p board sources +5V @3.0 A and +3.3V @50 mA to the MASS I/O connector, for use by optional
transition (QTB) connector boards Transition boards may be designed to be supplied only from the PC/II+p
Cpu board through the Mass I/O connector; or they may be directly supplied with external power; or they
may be supplied from both sources.
5.1 Absolute Maximum Ratings
Table 3 Electrical – Absolute Maximum Ratings
Parameter Symbol Min Max Units NOTES
Power Supply Digital VCC -0.3 6.0 V
Power Supply Current (Except
Peripherals)
ICC mA (3)
Ambient Temperature (Power Applied) TA -55 +125
°C
(1)
Storage Temperature TS -65 +150
°C
(2)
Current "from" CPU board
"to" QTB board (Through
Mass I/O Connector)
VM 3000 mA (4)
Warning: Operation at or beyond these limits may result in permanent damage to the board or to
components attached to the board. Always operate the board at the Recommended
Operating Conditions, see below.
NOTES
(1) Temperature is given for a board for which a Battery is NOT included onboard (an order option). If the
board contains lithium battery, then the absolute temperature board ratings must be modified to meet the
more restrictive ratings for lithium batteries. Refer to manufacturer's specifications for Lithium Batteries.
Never exceed the ratings of a lithium battery if a battery is present on the board.
(2) Temperature is given for a board for which power is NOT applied and a Battery is NOT included onboard
(an order option). If the board contains a lithium battery, then the absolute temperature board ratings must
be modified to meet the more restrictive ratings for lithium batteries. Refer to manufacturer's
specifications for Lithium Batteries. Never exceed the ratings of a lithium battery if a battery is
present on the board.
(3) The maximum current specification refers to the maximum current through +5V Power connector, J907
using a board populated with all options, and assumes that each component on the board is
simultaneously pulling the manufacturer's maximum specified power.
(4) Specifies power supplied from the CPU board "to" the Transition Board. Note that power MUST NOT be
supplied to be CPU board through the Mass I/O connector – It must be supplied to the board from
an external source, through the standard Power connectors provided on the board.