436 AMD Geode™ SC2200 Processor Data Book
Electrical Specifications
32580B
9.3.15 Power-Up SequencingFigure 9-55. Power-Up Sequencing With PWRBTN# Timing DiagramTable 9-44. Power-Up Sequence Using the Power Button Timing Parameters
Symbol Parameter Min Max Unit Comments
t1Voltage sequence -100 100 ms Optimum power-up results with
t1 = 0.
t2PWRBTN# inactive after VSB or VSBL
applied, whichever is applied last
0 1 µs PWRBTN# is an input and must
be powered by VSB.
t3PWRBTN# active pulse width 16 4000 ms If PWRBTN# max is exceeded,
ONCTL# will go inactive.
t4ONCTL# inactive after VSB applied 0 1 ms
t5Signal active after PWRBTN active 14 16 ms
t6VCORE and VIO applied after ONCTL#
active
0 ms System determines when VCORE
and VIO are applied, hence there
is no maximum constraint.
t7POR# inactive after VCORE and VIO
applied
50 ms POR# must not glitch during
active time.
t1
VSBL
VSB
VCORE
VIO
PWRBTN#
ONTCL#
PWRCNT[2:1]
POR#
t4
t2
t3
t1
t6
t5
t7