LH28F800BGB-BL85 데이터 시트보기 (PDF) - Sharp Electronics
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LH28F800BGB-BL85 Datasheet PDF : 43 Pages
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The CUI latches commands issued by system
software and is not altered by VPP or CE#
transitions or WSM actions. Its state is read array
mode upon power-up, after exit from deep power-
down or after VCC transitions below VLKO.
After block erase or word write, even after VPP
transitions down to VPPLK, the CUI must be placed
in read array mode via the Read Array command if
subsequent access to the memory array is desired.
5.6 Power-Up/Down Protection
The device is designed to offer protection against
accidental block erasure or word writing during
power transitions. Upon power-up, the device is
indifferent as to which power supply (VPP or VCC)
powers-up first. Internal circuitry resets the CUI to
read array mode at power-up.
A system designer must guard against spurious
writes for VCC voltages above VLKO when VPP is
active. Since both WE# and CE# must be low for a
command write, driving either to VIH will inhibit
writes. The CUI’s two-step command sequence
architecture provides added level of protection
against data alteration.
WP# provides additional protection from inadvertent
code or data alteration. The device is disabled
while RP# = VIL regardless of its control inputs
state.
LH28F800BG-L/BGH-L (FOR TSOP, CSP)
5.7 Power Consumption
When designing portable systems, designers must
consider battery power consumption not only during
device operation, but also for data retention during
system idle time. Flash memory’s nonvolatility
increases usable battery life because data is
retained when system power is removed.
In addition, deep power-down mode ensures
extremely low power consumption even when
system power is applied. For example, portable
computing products and other power sensitive
applications that use an array of devices for solid-
state storage can consume negligible power by
lowering RP# to VIL standby or sleep modes. If
access is again needed, the devices can be read
following the tPHQV and tPHWL wake-up cycles
required after RP# is first raised to VIH. See Section
6.2.4 through 6.2.6 "AC CHARACTERISTICS -
READ-ONLY and WRITE OPERATIONS" and
Fig. 11, Fig. 12 and Fig.13 for more information.
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