E
2-MBIT SmartVoltage BOOT BLOCK FAMILY
3.6.2
VCC, VPP AND RP# TRANSITIONS
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
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.
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.
After any word/byte program 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.
3.7.1
V
PP TRACE ON PRINTED CIRCUIT
BOARDS
Designing for in-system programming of 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.
Please refer to Intel’s application note AP-617
Additional Flash Data Protection Using VPP, RP#,
and WP# for a circuit-level description 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#.
NOTE:
Table headings in the DC and AC characteristics tables (i.e., BV-60, BV-80, BV-120, TBV-80, TBE-
120) refer to the specific products listed below. See Section 5.0 for more information on product
naming and line items.
Abbreviation
Applicable Product Names
BV-60
E28F002BV-T60, E28F002BV-B60, PA28F200BV-T60, PA28F200BV-B60,
E28F200CV-T60, E28F200CV-B60, E28F200BV-T60, E28F200BV-B60
BV-80
E28F002BV-T80, E28F002BV-B80, PA28F200BV-T80, PA28F200BV-B80,
E28F200CV-T80, E28F200CV-B80, E28F200BV-T80, E28F200BV-B80
BV-120
TBV-80
E28F002BV-T120, E28F002BV-B120, PA28F200BV-T120, PA28F200BV-B120
TE28F002BV-T80, TE28F002BV-B80, TB28F200BV-T80, TB28F200BV-B80,
TE28F200CV-T80, TE28F200CV-B80, TE28F200BV-T80, TE28F200BV-B80
27
SEE NEW DESIGN RECOMMENDATIONS
INTEL [ INTEL ]
