Seagate ST3300820ACE, ST3250820ACE, ST3320820ACE manual Typical current profile, Conducted noise

2.8.1.1Typical current profile

Figure 1 Typical 5V startup and operation current profile

Figure 2 Typical 12V startup and operation current profile

2.8.2Conducted noise

Input noise ripple is measured at the host system power supply across an equivalent 80-ohm resistive load on the +12 volt line or an equivalent 15-ohm resistive load on the +5 volt line.

•Using 12-volt power, the drive is expected to operate with a maximum of 120 mV peak-to-peak square-wave injected noise at up to 10 MHz.

•Using 5-volt power, the drive is expected to operate with a maximum of 100 mV peak-to-peak square-wave injected noise at up to 10 MHz.

Note. Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write current.

12 DB35.3 Series PATA Product Manual, Rev. C