QL4058-4PQ240C View Datasheet(PDF) - QuickLogic Corporation
Part Name
Description
MFG CO.
QL4058-4PQ240C
QuickLogic Corporation
'QL4058-4PQ240C' PDF : 23 Pages View PDF
QL4058 QuickRAM Data Sheet Rev H
Power-up Sequencing
VCCIO
VCC
(VCCIO -VCC)MAX
VCC
400 us
Time
Figure 8: Power-up Requirements
The following requirements must be met when powering up the device (see 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.
V CC
V CCIO
Internal Logic
Cells, RAM
blocks, etc
IO Cells
Figure 9: Internal Diode Between VCC and VCCIO
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