AT28C256-25SI Atmel, AT28C256-25SI Datasheet - Page 10

• Manufacturer Part Number: AT28C256-25SI
• Description: EEPROM 256K 11MIL GRIND - 250NS IND TEMP
• Manufacturer: Atmel

Specifications of AT28C256-25SI

• Product Category: EEPROM
• Memory Size: 256 Kbit
• Organization: 32 K x 8
• Data Retention: 10 yr
• Maximum Operating Current: 50 mA
• Operating Supply Voltage: 5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC
• Access Time: 250 ns
• Interface Type: Parallel
• Minimum Operating Temperature: - 40 C
• Output Enable Access Time: 100 ns
• Factory Pack Quantity: 27
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 4.5 V

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)