IBM C2B 2.25 Brick On Sled carrier 128-pin HPC - Manual (Page 15)

USER RESPONSIBLE F O R V E R I F Y I N G VERSION A N D COMPLETENESS
O E M F U N C T I O N A L SPECIFICATION ULTRASTAR X P (DFHC) SSA M O D E L S 1.12/2.25 GB - 1.0" H I G H
2.2 Power Requirements by Model
2.2.1 C1x Models
The following voltage specifications apply at the drive power connector. There is no special power on/off
sequencing required. The extra power needed for Brick On Sled models and the + 3 8 V power option are
described in 2.2.4, “CxB Models” on page 33.
Input Voltage
+ 5 Volts Supply 5V (± 5 % during run and spin-up)
+ 1 2 Volts Supply 12V (± 5 % during run) ( + 5 % / -7% during spin-up)
The following current values are the combination measured values of SCSI models and SSA Cx4 model. The
differences between SCSI and SSA is + 5 V currents. Because of different interface electronics and speed, SSA
electronics card requires more + 5 V current than SCSI. Read/Write Base Line is 290 ma higher. Idle
Average is 500 ma higher. (290ma and 500ma differences were found by measuring SSA Cx4 model). SSA
+ 5 V current numbers are derived from SCSI + 5 V current numbers by adding 290ma and 500ma accord-
ingly.
Population Population
Power Supply Current Notes Mean Stand. Dev.
+ 5 V D C (power-up) Minimum voltage slew rate = 4.5 V/sec
+ 5 V D C (idle avg) 1.23 Amps 0.02 Amps
+ 5 V D C (R/W baseline) 1.25 Amps 1 0.05 Amps
+ 5 V D C (R/W pulse) Base-to-peak .36 Amps 0.06 Amps
+ 1 2 V D C (power-up) Minimum voltage slew rate = 7.4 V/sec
+ 1 2 V D C (idle avg) 0.28 Amps 0.02 Amps
+ 1 2 V D C (seek avg) 1 op/sec 0.0027 Amps 0.002 Amps
+ 1 2 V D C (seek peak) 1.20 Amps 2 0.02 Amps
+ 1 2 V D C (spin-up) 3.0 sec max 1.5 Amps 3 0.1 Amps
Drive power
Avg idle power 9.51 Watts .35 Watts
Avg R/W power 30 ops/sec 10.58 Watts .35 Watts
1 See Figure 1 on page 18 for a plot of how the read/write baseline and read/write pulse sum together.
2 The idle average and seek peek should be added together to determine the total 12 volt peak current. See Figure 2
on page 19 for a typical buildup of these currents. Refer to examples on the following page to see how to combine
these values.
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