USER RESPONSIBLE FOR VERIFYING VERSION AND COMPLETENESS
OEM FUNCTIONAL SPECIFICATION ULTRASTAR XP (DFHC) SSA MODELS 1.12/2.25 GB -1.0" HIGH
2.2.3 C4x 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 O n Sled models and the +3 8V power option are
described in 2.2.4, “CxB Models” on page 33.
Input Voltage
+ 5 Volts Supply 5V (± 5% during run a nd 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+ 5V 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.
+5VDC (power-up) Minimum voltage slew rate = 4.5 V/sec
+5VDC (idle avg) 1.26Amps 0.02 Amps
+5VDC (R/W baseline) 1.27Amps70.05 Amps
+5VDC (R/W pulse) Base-to-peak .36 Amps 0.06Amps
+12VDC (power-up) Minimum voltage slew rate = 7.4 V/sec
+12VDC (idle avg) 0.77Amps 0.03 Amps
+12VDC (seek avg) 1 op/sec 0.0036 Amps 0.0002 Amps
+12VDC (seek peak) 1.3 Amps80.02 Amps
+12VDC (spin-up) 8.5 secmax 2.2 Amps90.1Amps
Drive power
Avg idle power 15.54 Watts .44Watts
Avg R/ W power 30 ops/sec 16.91 Watts .44 Watts
7See Figure 7 on page 30 for a plot of how the read/write baseline and read/write pulse sum together.
8The idle average and seek peek should be added together to determine the total 12 volt peak current. See Figure 8
on page 31 for a typical buildup of these currents. Refer to examples on the following page to see how to combine
these values.
9The current at start is the total 12 volt current required (ie. the motor start current, module current and voice coil
retract current). See Figure 9 on page 32 for typical 12 volt current during spindle motor start.
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