Numonyx™ Wireless Flash Memory (W30)
8.0
Power and Reset Specifications
Product Name devices have a layered approach to power savings that can significantly
reduce overall system power consumption.
• The APS feature reduces power consumption when the flash device is selected but
idle.
• If CE# is deasserted, the memory enters its standby mode, where current
consumption is even lower.
• Asserting RST# provides current savings similar to standby mode.
The combination of these features can minimize memory power consumption, and
therefore, overall system power consumption.
8.1
8.2
Active Power
With CE# at VIL and RST# at VIH, the flash device is in the active mode. Refer to
Section 6.1, “DC Current Characteristics” on page 26, for ICC values. When the flash
device is in active state, it consumes the most power from the system. Minimizing flash
device active current therefore reduces system power consumption, especially in
battery-powered applications.
Automatic Power Savings (APS)
Automatic Power Saving (APS) provides low power operation during a read active state.
ICCAPS is the average current measured over any 5 ms time interval, 5 µs after CE# is
deasserted. During APS, average current is measured over the same time interval 5 µs
after the following events:
• There is no internal read, program or erase activity.
• CE# is asserted.
• The address lines are quiescent, and at VIL or VIH.
OE# can be driven during APS.
8.3
Standby Power
When CE# is deasserted, the flash device is deselected and placed in standby,
substantially reducing power consumption. In standby, the data outputs are placed in
High-Z, independent of the level placed on OE#. Standby current, ICCS, is the average
current measured over any 5 ms time interval, 5 µs after CE# is deasserted. During
standby, average current is measured over the same time interval 5 µs after CE# is
deasserted.
When the flash device is deselected (while CE# is deasserted) during a program or
erase operation, it continues to consume active power until the program or erase
operation completes.
8.4
Power-Up/Down Characteristics
The flash device is protected against accidental block erasure or programming during
power transitions. Power supply sequencing is not required if VCC and VPP are
connected together; so it does not matter whether VPP or VCC powers-up first. If VPP is
not connected to the system supply, then VCC must attain VCCMIN before applying VCCQ
and VPP. Do not drive flash device inputs before supply voltage = VCCQMIN. Power supply
transitions can occur only when RST# is low.
Datasheet
44
November 2007
Order Number: 290702-13
NUMONYX [ NUMONYX B.V ]
