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© 2002 QuickLogic Corporation
www.quicklogic.com
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QL4009 QuickRAM Data Sheet Rev B
Power-up Sequencing
Figure 7: Power-up Requirements
The following requirements must be met when powering up the device:
(Refer to Figure 7 above)
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When ramping up the power supplies keep (VCCIO -VCC)MAX ≤ 500 mV. Deviation from
this recommendation can cause permanent damage to the device.
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VCCIO must lead VCC when ramping the device.
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The power supply must take greater than or equal to 400 µs to reach VCC. Ramping to
VCC/VCCIO earlier than 400 µs can cause the device to behave improperly.
An internal diode is present in-between VCC and VCCIO, as shown in Figure 8.
Figure 8: Internal Diode Between V
CC and VCCIO
V
CCIO
V
CC
(V
CCIO -VCC)MAX
Time
400 us
V
CC
V CC
V CCIO
Internal Logic
Cells, RAM
blocks, etc
IO Cells
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