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AT29C020-70PC

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
10
AT29C020
0291N–FLASH–07/02
Software Data Protection Enable Algorithm
()
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA A0
TO
ADDRESS 5555
LOAD DATA
TO
PAGE (128 BYTES)
(4)
WRITES ENABLED
ENTER DATA
PROTECT STATE
(2)
Software Data Protection Disable Algorithm
()
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 80
TO
ADDRESS 5555
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 20
TO
ADDRESS 5555
LOAD DATA
TO
PAGE (128 BYTES)
(4)
EXIT DATA
PROTECT STATE
(3)
Notes: 1. Data Format: I/O7 - I/O0 (Hex); Address Format: A14 - A0 (Hex).
2. Data Protect state will be activated at end of program cycle.
3. Data Protect state will be deactivated at end of program period.
4. 256 bytes of data MUST BE loaded.
Software Protected Program Cycle Waveform
(1)(4)(5)
Notes: 1. A8 through A17 must specify the sector address during each high-to-low transition of WE (or CE) after the software code
has been entered.
4. OE
must be high when WE and CE are both low.
5. All bytes that are not loaded within the sector being programmed will be indeterminate.
11
AT29C020
0291N–FLASH–07/02
Notes: 1. These parameters are characterized and not 100% tested.
2. See t
OE
spec in AC Read Characteristics.
Data Polling Waveforms
Notes: 1. These parameters are characterized and not 100% tested.
2. See t
OE
spec in AC Read Characteristics.
Toggle Bit Waveforms
(1)(2)(3)
Notes: 1. Toggling either OE or CE or both OE and CE will operate toggle bit.
2. Beginning and ending state of I/O6 may vary.
3. Any address location may be used but the address should not vary.
Data Polling Characteristics
(1)
Symbol Parameter Min Typ Max Units
t
DH
Data Hold Time 10 ns
t
OEH
OE Hold Time 10 ns
t
OE
OE to Output Delay
(2)
ns
t
WR
Write Recovery Time 0 ns
Toggle Bit Characteristics
(1)
Symbol Parameter Min Typ Max Units
t
DH
Data Hold Time 10 ns
t
OEH
OE Hold Time 10 ns
t
OE
OE to Output Delay
(2)
ns
t
OEHP
OE High Pulse 150 ns
t
WR
Write Recovery Time 0 ns
12
AT29C020
0291N–FLASH–07/02
Software Product Identification Entry
(1)
Software Product Identification Exit
(1)
Notes: 1. Data Format: I/O15 - I/O0 (Hex);
Address Format: A14 - A0 (Hex).
2. A1 - A17 = V
IL
.
Manufacturer Code is read for A0 = V
IL
;
Device Code is read for A0 = V
IH
.
3. The device does not remain in identification mode
if powered down.
4. The device returns to standard operation mode.
5. Manufacturer Code is 1F. The Device Code is DA.
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 90
TO
ADDRESS 5555
PAUSE 10 mS ENTER PRODUCT
IDENTIFICATION
MODE
(2)(3)(5)
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA F0
TO
ADDRESS 5555
PAUSE 10 mS EXIT PRODUCT
IDENTIFICATION
MODE
(4)
Boot Block Lockout
Feature Enable Algorithm
(1)
Notes: 1. Data Format: I/O7 - I/O0 (Hex);
Address Format: A14 - A0 (Hex).
2. Lockout feature set on lower address boot block.
3. Lockout feature set on higher address boot block.
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 80
TO
ADDRESS 5555
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 40
TO
ADDRESS 5555
LOAD DATA 00
TO
ADDRESS 00000H
(2)
PAUSE 20 mS
LOAD DATA FF
TO
ADDRESS 3FFFFH
(3)
PAUSE 20 mS
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

AT29C020-70PC

Mfr. #:
Buy AT29C020-70PC
Manufacturer:
Description:
IC FLASH 2M PARALLEL 32DIP
Lifecycle:
New from this manufacturer.
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