28F004BE 데이터 시트보기 (PDF) - Intel
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28F004BE Datasheet PDF : 57 Pages
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E
4-MBIT SmartVoltage BOOT BLOCK FAMILY
3.6.2
VCC, VPP AND RP# TRANSITIONS
The CUI latches commands as issued by system
software and is not altered by VPP or CE#
transitions or WSM actions. Its default state upon
power-up, after exit from deep power-down mode,
or after VCC transitions above VLKO (Lockout
voltage), is read array mode.
After any word/byte write or block erase operation is
complete and even after VPP transitions down to
VPPLK, the CUI must be reset to read array mode
via the Read Array command if accesses to the
flash memory are desired.
Please refer to Intel’s application note AP-617
Additional Flash Data Protection Using VPP, RP#,
and WP#, for a circuit-level discription of how to
implement the protection discussed in Section 3.6.
3.7 Power Supply Decoupling
Flash memory’s power switching characteristics
require careful device decoupling methods. System
designers should consider three supply current
issues:
1. Standby current levels (ICCS)
2. Active current levels (ICCR)
3. Transient peaks produced by falling and rising
edges of CE#.
Transient current magnitudes depend on the device
outputs’ capacitive and inductive loading. Two-line
control and proper decoupling capacitor selection
will suppress these transient voltage peaks. Each
flash device should have a 0.1 µF ceramic
capacitor connected between each VCC and GND,
and between its VPP and GND. These high-
frequency, inherently low-inductance capacitors
should be placed as close as possible to the
package leads.
3.7.1
VPP TRACE ON PRINTED CIRCUIT
BOARDS
Designing for in-system writes to the flash memory
requires special consideration of the VPP power
supply trace by the printed circuit board designer.
The VPP pin supplies the flash memory cells current
for programming and erasing. One should use
similar trace widths and layout considerations given
to the VCC power supply trace. Adequate VPP
supply traces, and decoupling capacitors placed
adjacent to the component, will decrease spikes
and overshoots.
NOTE:
Table headings in Sections 5 and 6 (i.e., BV-60, BV-80, BV-120, TBV-80, TBE-120) refer to the
specific products listed below. See Appendix A for more information on product naming and line items.
Abbreviation
Applicable Product Names
BV-60
E28F004BV-T60, E28F004BV-B60, PA28F400BV-T60, PA28F400BV-B60,
E28F400CV-T60, E28F400CV-B60, E28F400BV-T60, E28F400BV-B60
BV-80
E28F004BV-T80, E28F004BV-B80, PA28F400BV-T80, PA28F400BV-B80,
E28F400CV-T80, E28F400CV-B80, E28F400BV-T80, E28F400BV-B80
BV-120 E28F004BV-T120, E28F004BV-B120, PA28F400BV-T120, PA28F400BV-B120
TBV-80
TE28F004BV-T80, TE28F004BV-B80, TB28F400BV-T80, TB28F400BV-B80,
TE28F400CV-T80, TE28F400CV-B80, TE28F400BV-T80, TE28F400BV-B80
TBE-120 TE28F004BE-T120, TE28F004BE-B120, TE28F400CE-T120, TE28F400CE-B120
PRELIMINARY
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