Dual Intel Xeon Processor Voltage Regulator Down (VRD) Design Guidelines

Dual Intel
®
Xeon™ Processor Voltage Regulator Down (VRD) Guidelines
14
Table 3 – Low Voltage Intel
®
Xeon ™ Processor Voltage Deviations from VID
VRD
Icc
UP Low
Voltage Intel
Xeon
Processor Vcc
DP Low
Voltage Intel
Xeon
Processor Vcc
Max Min Max Min
0 1.300 1.274 1.300 1.274
5 1.295 1.269 1.298 1.272
10 1.291 1.265 1.295 1.269
15 1.286 1.260 1.293 1.267
20 1.281 1.255 1.291 1.265
25 1.276 1.250 1.288 1.262
30 1.272 1.246 1.286 1.260
35 1.267 1.241 1.283 1.257
40 1.262 1.236 1.281 1.255
45 1.257 1.231 1.279 1.253
50 1.276 1.250
55 1.274 1.248
60 1.272 1.246
65 1.269 1.243
70 1.267 1.241
75 1.264 1.238
80 1.262 1.236
85 1.260 1.234
2.1.6 Turn-on Response Time
The output voltage should reach its specified range within 50 msec of the input power’s reaching
its minimum voltage.
2.1.7 Overshoot at Turn-On or Turn-Off
Overshoot upon the application or removal of the input voltage must be less than 2% above the
nominal output voltage set by the Voltage Identification (VID) code. No negative voltage below
−0.1V may be present at the output at any time.