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14 Specifications

2.5 Power Requirements

In order to guarantee a stable functionality of the system, it is rec-

ommended to provide more power than the system requires. An

industrial power supply unit should be able to provide at least

twice as much power as the entire system requires of each

voltage. An ATX power supply unit should be able to provide at

least three times as much power as the entire system requires of

each voltage.

The tolerance of the voltage lines described in the CompactPCI

specification (PICMG 2.0 R3.0) is +5%/-3% for 5, 3.3 V and ±5%

for ±12V. This specification is for power delivered to each slot and

it includes both the power supply and the backplane tolerance.

Voltage

Nominal

Value

Tolerance

Max. Ripple

(P - P)

5V +5.0 VDC +5% / -3% 50 mV

3.3V +3.3 VDC +5% / -3% 50 mV

+12V +12 VDC +5% / -5% 240 mV

-12V -12 VDC +5% / -5% 240 mV

V I/O (PCI I/O

Buffer Voltage)

+3.3 VDC or

+5 VDC

+5% / -3% 50 mV

GND

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