Sun Microsystems 220R Control Signals, Remote Enable PowerOn, System Unit Power Budget

Output	Voltage (VDC)	Maximum Current	Regulation Band
		(A)
1	3.3	50.0	3.23	to 3.43
2	5.0	40.0	4.95	to 5.15
3	12.0	5.0	11.40 to 12.60
4	-12.0	0.5	-12.60 to -11.40
5	5.1	1.0	4.95-5.25

Note - The combined power of output 1 and output 3 must be less than 320 watts.

C.1.15 Control Signals

With the exception of the PowerOn signal, all power supply control signals are at TTL signal levels.

Parameter	Minimum	Maximum
VOH (high-level output voltage)	2.4 VDC
VOL (low-level output voltage)		0.4 VDC
VIH (high-level input voltage)	2.0 VDC
VIL (low-level input voltage)		0.8 VDC

C.1.15.1 Remote Enable PowerOn

A remote interface can enable the DC outputs with a low signal to the PowerOn input and the DC outputs with a high signal to the PowerOn input. The signal is interfaced to the power supply through the main logic board and the power distribution board.

C.1.15.2 System Unit Power Budget

The following subsections present the system unit power budgets.

Functional Description 275