SilverStone DA1000R Gold, Manual

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2.3.1. PWR_OK (Power Good Signal)
PWR_OK is a “power good” signal. It will be asserted high by the power supply
to indicate that the +5V output is above the under voltage threshold listed in
Table 2. of Section 2.2. PWR_OK will be de-asserted to a low state when
+5V output voltage falls below under voltage threshold, or when AC power has
been removed for a time sufficiently such that power supply operation cannot
work normally. The electrical and timing characteristics of the PWR_OK signal
are given in Table 10. and in figure 1.
2.3.2. PS_ON (DC Soft Start)
PS_ON# is an active-low, TTL-compatible signal that allows a motherboard to
remotely control the power supply in conjunction with features such as soft on/off,
Wake on LAN*, or wake-on-modem. When PS_ON# is pulled to TTL low,
the power supply should turn on the four main DC output rails: +12 VDC, +5 VDC,
+3.3 VDC, and -12 VDC. When PS_ON# is pulled to TTL high or open-circuited,
the DC output rails should not deliver current and should be held at zero
potential with respect to ground. PS_ON# has no effect on the +5VSB output,
which is always enabled whenever the AC power is present. Table 11 lists
PS_ON signal characteristics.
Signal type +5V TTL compatible
Logic level low < 0.4 V while sinking 4 mA
Logic level high
Between 2.4 V and 5 V output while sourcing 200 μ A
High-state output impedance 1 k Ω from output to common
Max Ripple/Noise 400 mV p-p
Table 10. PWR_OK Signal Characteristics
Parameter Description Value
Required Recommended for
Alternative Sleep Mode
T0 AC power on time <2s
T1 Power-on time < 150ms
T2 Rise time 0.2 – 20 ms
T3 PWR_OK delay 100 – 150 ms
T4 PWR_OK rise time < 10 ms
T5 AC loss to PWR_OK hold-up time > 12 ms 80% load
T6 PWR_OK inactive to DC loss delay > 1 ms