AM28F020 Advanced Micro Devices, AM28F020 Datasheet - Page 27

• Manufacturer Part Number: AM28F020
• Description: 2 Megabit (256 K x 8-Bit) CMOS 12.0 Volt/ Bulk Erase Flash Memory
• Manufacturer: Advanced Micro Devices

AC Characteristics—Write (Erase/Program) Operations
Notes:
1. Read timing characteristics during read/write operations are the same as during read-only operations. Refer to AC
2. Maximum pulse widths not required because the on-chip program/erase stop timer will terminate the pulse widths internally
3. Chip Enable-Controlled Writes: Write operations are driven by the valid combination of Chip Enable (CE#) and Write Enable
4. Not 100% tested.
Parameter Symbols
JEDEC
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
AVAV
AVWL
WLAX
DVWH
WHDX
WHGL
GHWL
ELWL
WHEH
WLWH
WHWL
WHWH1
WHWH2
VPEL
VCS
VPPR
VPPF
LKO
Characteristics for Read Only operations.
on the device.
(WE#). In systems where CE# defines the Write Pulse Width (within a longer WE# timing waveform) all setup, hold and
inactive WE# times should be measured relative to the CE# waveform.
Standard
t
t
t
t
t
t
t
t
t
t
WC
AS
AH
DS
DH
WR
CS
CH
WP
WPH
Description
Write Cycle Time (Note 4)
Address Setup Time
Address Hold Time
Data Setup Time
Data Hold Time
Write Recovery Time Before Read
Read Recovery Time Before Write
CE
CE
Write Pulse Width
Write Pulse Width High
Duration of Programming Operation (Note 2)
Duration of Erase Operation (Note 2)
V
V
V
V
V
PP
CC
PP
PP
CC
#
#
Setup Time to Chip Enable Low (Note 4)
Rise Time (Note 4) 90% V
Fall Time (Note 4) 10% V
Setup Time to Chip Enable Low (Note 4)
< V
Setup Time
Hold Time
LKO
to Reset (Note 4)
PPL
PPH
Am28F020
Min
Min
Min
Min
Min
Min
Min
Min
Min
Min
Min
Min
Min
Min
Min
Min
Min
Min
100
500
500
100
-70
9.5
70
45
10
10
50
45
45
20
0
6
0
0
0
Am28F020 Speed Options
100
500
500
100
-90
9.5
90
45
45
10
45
20
10
50
0
6
0
0
0
-120
120
100
500
500
100
9.5
50
50
10
50
20
10
50
0
6
0
0
0
-150
150
100
500
500
100
9.5
60
50
10
60
20
10
50
0
6
0
0
0
-200
100
200
500
500
100
9.5
10
75
50
10
60
20
50
0
6
0
0
0
Unit
ms
ns
ns
ns
ns
µs
µs
ns
µs
ns
ns
ns
ns
µs
ns
ns
ns
ns
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