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AT29C256-90PI

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
10
AT29C256
0046O–FLASH–06/02
Software Data Protection
Enable Algorithm
(1)
Notes: 1. Data Format: I/O7 - I/O0 (Hex);
Address Format: A14 - A0 (Hex).
2. Data Protect state will be re-activated at end of pro-
gram cycle.
3. Data Protect state will be deactivated at end of pro-
gram period.
4. 64 bytes of data MUST BE loaded.
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA A0
TO
ADDRESS 5555
LOAD DATA
TO
PAGE (64 BYTES)
(4)
WRITES ENABLED
(2)
ENTER DATA
PROTECT STATE
Software Data Protection
Disable Algorithm
(1)
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 (64 BYTES)
(4)
EXIT DATA
PROTECT STATE
(3)
Software Protected Program Cycle Waveform
(1)(2)(3)
Notes: 1. A6 through A14 must specify the page address during each high-to-low transition of WE (or CE) after the software code has
been entered.
2. OE
must be high when WE and CE arebothlow.
3. All bytes that are not loaded within the page being programmed will be indeterminate.
11
AT29C256
0046O–FLASH–06/02
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 will 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 0 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 0 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
AT29C256
0046O–FLASH–06/02
Software Product Identification Entry
(1)
Notes: 1. Data Format: I/O7 - I/O0 (Hex);
Address Format: A14 - A0 (Hex).
2. A1 - A14 = 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 DC.
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)
Software Product Identification Exit
(1)
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)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

AT29C256-90PI

Mfr. #:
Buy AT29C256-90PI
Manufacturer:
Description:
IC FLASH 256K PARALLEL 28DIP
Lifecycle:
New from this manufacturer.
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