AT29C256-20JC Atmel, AT29C256-20JC Datasheet - Page 11

• Manufacturer Part Number: AT29C256-20JC
• Description: IC FLASH 256KBIT 200NS 32PLCC
• Manufacturer: Atmel

Specifications of AT29C256-20JC

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 256K (32K x 8)
• Speed: 200ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 32-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: AT29C25620JC

18. Software Data Protection
Notes:
20. Software Protected Program Cycle Waveform
Notes:
0046S–FLASH–2/07
Enable Algorithm
1. Data Format: I/O7 - I/O0 (Hex);
2. Data Protect state will be re-activated at end of pro-
3. Data Protect state will be deactivated at end of pro-
4. 64 bytes of data MUST BE loaded.
1. A6 through A14 must specify the page address during each high-to-low transition of WE (or CE) after the software code has
2. OE must be high when WE and CE are both low.
3. All bytes that are not loaded within the page being programmed will be indeterminate.
Address Format: A14 - A0 (Hex).
gram cycle.
gram period.
been entered.
PAGE (64 BYTES)
ADDRESS 2AAA
LOAD DATA AA
ADDRESS 5555
ADDRESS 5555
LOAD DATA 55
LOAD DATA A0
LOAD DATA
TO
TO
TO
TO
(4)
(1)
WRITES ENABLED
ENTER DATA
PROTECT STATE
(2)
19. Software Data Protection
Disable Algorithm
(1)(2)(3)
PAGE (64 BYTES)
ADDRESS 2AAA
ADDRESS 2AAA
ADDRESS 5555
ADDRESS 5555
ADDRESS 5555
ADDRESS 5555
LOAD DATA AA
LOAD DATA AA
LOAD DATA 55
LOAD DATA 80
LOAD DATA 55
LOAD DATA 20
LOAD DATA
TO
TO
TO
TO
TO
TO
TO
(4)
EXIT DATA
PROTECT STATE
(1)
AT29C256
(3)
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