DATASHEET
64k, 8k x 8-Bit 5 Volt, Byte Alterable EEPROM
X28HC64
Features
The X28HC64 is an 8k x 8 EEPROM, fabricated with Intersil’s
proprietary, high performance, floating gate CMOS technology.
Like all Intersil programmable nonvolatile memories, the
X28HC64 is a 5V only device. It features the JEDEC approved
pinout for byte-wide memories, compatible with industry
standard RAMs.
• 70ns access time
• Simple byte and page write
- Single 5V supply
- No external high voltages or VP-P control circuits
- Self-timed
- No erase before write
The X28HC64 supports a 64-byte page write operation, effectively
providing a 32µs/byte write cycle, and enabling the entire
memory to be typically written in 0.25 seconds. The X28HC64
also features DATA Polling and Toggle Bit Polling, two methods
providing early end of write detection. In addition, the X28HC64
includes a user-optional software data protection mode that
further enhances Intersil’s hardware write protect capability.
- No complex programming algorithms
- No overerase problem
• Low power CMOS
- 40mA active current maximum
• 200µA standby current maximum
• Fast write cycle times
Intersil EEPROMs are designed and tested for applications
requiring extended endurance. Inherent data retention is
greater than 100 years.
- 64-byte page write operation
- Byte or page write cycle: 2ms typical
- Complete memory rewrite: 0.25s typical
- Effective byte write cycle time: 32µs typical
• Software data protection
• End of write detection
- DATA polling
- Toggle bit
• High reliability
- Endurance: 100,000 cycles
- Data retention: 100 years
• JEDEC approved byte-wide pinout
• Pb-free available (RoHS compliant)
Pin Configurations
X28HC64
(28 LD PDIP, SOIC)
TOP VIEW
X28HC64
(32 LD PLCC)
TOP VIEW
1
2
3
4
5
6
7
8
9
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
CC
NC
WE
NC
A
12
4
3
2
1 32 31 30
29
A
A
A
A
A
A
A
A
7
6
5
4
3
2
1
0
A
A
A
A
A
A
A
5
6
7
8
9
A
8
6
5
4
3
2
1
0
A
8
28
27
26
25
24
23
22
21
A
9
A
9
A
11
A
11
NC
OE
OE
X28HC64
X28HC64
A
10
A
10
11
12
13
10
CE
I/O
CE
I/O
10
11
12
13
14
7
NC
I/O
7
I/O
I/O
I/O
I/O
I/O
I/O
6
5
4
3
0
1
2
I/O
0
6
14 15 16 17 18 19 20
I/O
V
SS
June 27, 2016
FN8109.4
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1
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