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QL4016 bảng dữ liệu(PDF) 11 Page - List of Unclassifed Manufacturers

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QL4016 bảng dữ liệu(HTML) 11 Page - List of Unclassifed Manufacturers

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© 2002 QuickLogic Corporation
www.quicklogic.com
11
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QL4016 QuickRAM Data Sheet Rev I
Power-up Sequencing
Figure 8: Power-up Requirements
The following requirements must be met when powering up the device (refer to Figure 8):
•
When ramping up the power supplies keep (VCCIO -VCC)MAX ≤ 500 mV. Deviation from
this recommendation can cause permanent damage to the device.
•
VCCIO must lead VCC when ramping the device.
•
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 9.
Figure 9: Internal Diode Between VCC 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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