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Specifications 11

CT-30

2.7 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. An ATX power

supply unit should be able to provide at least three times as much

power as the entire system requires.

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.

Table 2-2: CompactPCI input voltage characteristics

Vo l ta ge 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

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 97 98

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Zippy Tech. HG2 Manuale Utente Pagina 23