Power; Power Sequencing; Power Reset Limits - Quantum Atlas 10K II 9.2/18.4/36.7/73.4 GB Product Manual

Specifications
4.5

POWER

The Quantum Atlas 10K II Ultra 160/m SCSI hard disk drive operates from two
supply voltages:
+12V 5%
+5V 5%
The allowable ripple and noise (60Hz – 100MHz) is 150 mV peak-to-peak, for the
+12V supply and 75 mV peak-to-peak, for the +5V supply.

4.5.1 Power Sequencing

Power may be applied in any order or manner, or open either the power or power
return line with no loss of data or damage to the disk drive. However, data may be
lost in the sector being written at the time of a power loss. The disk drive can
withstand transient voltages of +10% to –100% from nominal while powering up or
down.

4.5.2 Power Reset Limits

When powering up, the disk drive remains reset until both V
4-5 are exceeded. When powering down, the drive becomes reset when either supply
voltage drops below the V
4-6 Quantum Atlas 10K II Ultra 160/m SCSI Hard Disk Drives
threshold.
LT
Table 4-5 Power Reset Limits*
DC VOLTAGE
+5V
+12V
* Includes a 75 mV peak-to-peak ripple on +5V or 150 mV
peak-to-peak ripple on +12V to maximize or minimize values.
HT
THRESHOLD
V = 4.25V minimum
LT
V = 4.365V maximum
HT
V = 10.16V minimum
LT
V = 10.48V maximum
HT
reset limits in Table