AT28HC64B-90SU Atmel, AT28HC64B-90SU Datasheet - Page 10

• Manufacturer Part Number: AT28HC64B-90SU
• Description: IC EEPROM 64KBIT 90NS 28SOIC
• Manufacturer: Atmel

Specifications of AT28HC64B-90SU

• Format - Memory: EEPROMs - Parallel
• Memory Type: EEPROM
• Memory Size: 64K (8K x 8)
• Speed: 90ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

19. Software Data Protection Enable
Notes:
21. Software Protected Write Cycle Waveforms
Notes:
10
Algorithm
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.
1. A6 through A12 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.
AT28HC64B
Address Format: A12 - A0 (Hex).
even if no other data is loaded.
period even if no other data is loaded.
code has been entered.
LOAD LAST BYTE
ANY ADDRESS
ADDRESS 0AAA
LAST ADDRESS
LOAD DATA AA
ADDRESS 1555
ADDRESS 1555
LOAD DATA XX
LOAD DATA 55
LOAD DATA A0
(1)
TO
TO
TO
TO
TO
A6 - A12
A0 -A5
DATA
WE
OE
(4)
CE
WRITES ENABLED
ENTER DATA
PROTECT STATE
t
AS
(2)
t
AH
t
DS
t
WP
t
DH
t
WPH
20. Software Data Protection Disable
Notes:
Algorithm
(1)(2)
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.
Address Format: A12 - A0 (Hex).
even if no other data is loaded.
period even if no other data is loaded.
t
BLC
LOAD LAST BYTE
ANY ADDRESS
ADDRESS 0AAA
ADDRESS 0AAA
LAST ADDRESS
LOAD DATA AA
ADDRESS 1555
ADDRESS 1555
LOAD DATA AA
ADDRESS 1555
ADDRESS 1555
LOAD DATA XX
LOAD DATA 55
LOAD DATA 80
LOAD DATA 55
LOAD DATA 20
(1)
TO
TO
TO
TO
TO
TO
TO
TO
(4)
t
WC
EXIT DATA
PROTECT STATE
(3)
0274L–PEEPR–2/3/09