AT28C256E-15PU Atmel, AT28C256E-15PU Datasheet - Page 10

• Manufacturer Part Number: AT28C256E-15PU
• Description: IC EEPROM 256KBIT 150NS 28DIP
• Manufacturer: Atmel

Specifications of AT28C256E-15PU

• Format - Memory: EEPROMs - Parallel
• Memory Type: EEPROM
• Memory Size: 256K (32K x 8)
• Speed: 150ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

21. Software Protected Write Cycle Waveforms
Notes:
19. Software Data Protection
Notes:
10
Enable Algorithm
1. A6 through A14 must specify the same page address during each high to low transition of WE (or CE) after the software
2. OE must be high only when WE and CE are both low.
1. Data Format: I/O7 - I/O0 (Hex);
2. Write Protect state will be activated at end of write
3. Write Protect state will be deactivated at end of write
4. 1 to 64 bytes of data are loaded.
AT28C256
code has been entered.
Address Format: A14 - A0 (Hex).
even if no other data is loaded.
period even if no other data is loaded.
LOAD LAST BYTE
ANY ADDRESS
ADDRESS 2AAA
LAST ADDRESS
LOAD DATA AA
ADDRESS 5555
ADDRESS 5555
LOAD DATA XX
LOAD DATA 55
LOAD DATA A0
TO
TO
TO
TO
TO
(4)
WRITES ENABLED
ENTER DATA
PROTECT STATE
(1)
(2)
20. Software Data Protection
Disable Algorithm
(1)(2)
LOAD LAST BYTE
ANY ADDRESS
ADDRESS 2AAA
ADDRESS 2AAA
LAST ADDRESS
ADDRESS 5555
ADDRESS 5555
ADDRESS 5555
ADDRESS 5555
LOAD DATA AA
LOAD DATA AA
LOAD DATA XX
LOAD DATA 55
LOAD DATA 80
LOAD DATA 55
LOAD DATA 20
TO
TO
TO
TO
TO
TO
TO
TO
(4)
EXIT DATA
PROTECT STATE
(1)
0006M–PEEPR–12/09
(3)