pa28f004sc-120 Intel Corporation, pa28f004sc-120 Datasheet - Page 17

• Manufacturer Part Number: pa28f004sc-120
• Description: 8-mbit 1-mbit X 8 Flashfiletm Memory
• Manufacturer: Intel Corporation

Power Supply Decoupling
Flash memory power switching characteristics re-
quire careful device decoupling System designers
are interested in 3 supply current issues standby
current levels (I
transient peaks produced by falling and rising edges
of CE
the device outputs’ capacitive and inductive loading
Two-line control and proper decoupling capacitor
selection will suppress transient voltage peaks
Each device should have a 0 1 mF ceramic capacitor
connected between each V
tween its V
inherent-inductance capacitors should be placed as
close as possible to package leads Additionally for
Transient current magnitudes depend on
PP
and GND These high frequency low
SB
) active current levels (I
CC
Figure 9 Erase Suspend Resume Flowchart
and GND and be-
290429 – 10
CC
) and
Operation
Standby
Standby
every 8 devices a 4 7 mF electrolytic capacitor
should be placed at the array’s power supply con-
nection between V
will overcome voltage slumps caused by PC board
trace inductances
V
Writing flash memories while they reside in the tar-
get system requires that the printed circuit board
designer pay attention to the V
trace The V
for writing and erasing Use similar trace widths and
layout considerations given to the V
Adequate V
crease V
Write
Write
Read
Write
Read
Write
Bus
PP
Trace on Printed Circuit Boards
PP
Status Register
Erase Resume
Read Array
Command
PP
voltage spikes and overshoots
Suspend
PP
Erase
Read
supply traces and decoupling will de-
pin supplies the memory cell current
CC
and GND The bulk capacitor
Data
Data
Check RY BY
V
Busy or Read Status
Register
Check SR 7
1
Toggle OE
Update Status Register
Check SR 6
1
Data
Read array data from block
other than that being
erased
Data
OH
e
e
Ready 0
Suspended
e
e
e
e
e
Ready V
Comments
B0H
70H
FFH
D0H
PP
or CE
CC
e
power supply
28F008SA
OL
Busy
power bus
e
to
17