X28HC64D-12 Intersil, X28HC64D-12 Datasheet - Page 7

• Manufacturer Part Number: X28HC64D-12
• Description: IC EEPROM 8K X 8 28CDIP
• Manufacturer: Intersil

Specifications of X28HC64D-12

• Format - Memory: EEPROMs - Parallel
• Memory Type: EEPROM
• Memory Size: 64K (8K x 8)
• Speed: 120ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-CDIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: Q4625548

Resetting Software Data Protection
FIGURE 9. SOFTWARE SEQUENCE TO DEACTIVATE
V
WE
CE
CC
SOFTWARE
ADDR
DATA
WRITE DATA AA
WRITE DATA AA
WRITE DATA 20
WRITE DATA 55
WRITE DATA 80
WRITE DATA 55
TO ADDRESS
TO ADDRESS
TO ADDRESS
TO ADDRESS
TO ADDRESS
1555
AAA
ADDRESS
0AAA
0AAA
1555
1555
1555
1555
7
FIGURE 8. RESET SOFTWARE DATA PROTECTION TIMING SEQUENCE
0AAA
55
1555
80
X28HC64
1555
AA
In the event the user wants to deactivate the software data
protection feature for testing or reprogramming in an
EEPROM programmer, the following six step algorithm will
reset the internal protection circuit. After t
will be in standard operating mode.
Note: Once initiated, the sequence of write operations
should not be interrupted.
0AAA
55
1555
20
≥t
WC
STANDARD
OPERATING
MODE
WC
, the X28HC64
August 28, 2009
FN8109.2