Input Noise Ripple And Frequency; Figure 1. Typical Rms Start-Up Current Profile - Seagate ST251N Product Manual

1.9.1 INPUT NOISE RIPPLE AND FREQUENCY
The maximum permitted noise ripple is 100 mV (peak-to-peak) on ei-
ther
+
5 or
+
12 VDC measured on the host system power supply
across the following equivalent resistive loads:
+
12 VDC:
+
5 VDC:
16 0
50
The maximum permitted noise frequency is 20 MHz on both the
+
12
VDC and
+
5 VDC lines.
FIGURE 1: Typical RMS Start-up Current Profile
These measurements are at nominal voltages. 25°C ambient temper-
ature, with drive termination.
2.0
1.95 Amp
1 . 5 - t t - - - - - \ - - - + - - - - - - - - ; - - - - - + - - - - - - + - - - - - - - - ; - - - - - 1
+12 V DC
+SVOC
I
1.36 Amp
0.5-+------+--+--i------;e-----'rl----+---+-- 0.43 Amp
-+------+----+---!
SECONDS 5 10 15
20 25 30
1-6
ST251Nl277N Product Manual. Rev. B