qh25f320s33b8 Numonyx, qh25f320s33b8 Datasheet - Page 15

• Manufacturer Part Number: qh25f320s33b8
• Description: Numonyx? Serial Flash Memory S33
• Manufacturer: Numonyx

Numonyx™ Serial Flash Memory (S33)
5.3.2
December 2007
Order Number: 314822-03
Power Supply Decoupling
Flash memory devices require careful power supply decoupling. The basic power supply
considerations are as follows:
When the device is accessed, many internal conditions change. Circuits within the
device enable charge-pumps, and internal logic states change at high speed. All of
these internal activities produce transient signals. Transient current magnitudes depend
on the capacitive and inductive loading at the device output. Two-line control and
correct de-coupling capacitor selection suppress transient voltage peaks.
Additionally, for every eight devices used in the system, a 4.7 µF electrolytic capacitor
should be placed between power and ground close to the devices. The bulk capacitor is
meant to overcome voltage droop caused by PCB trace inductance.
1. Standby current levels
2. Active current levels
3. Transient peaks produced when the device is enabled
Datasheet
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