®
X28HC64
64K, 8K x 8 Bit
Data Sheet
June 1, 2005
FN8109.0
5 Volt, Byte Alterable EEPROM
FEATURES
• 70ns access time
• Simple byte and page write
—Single 5V supply
—No external high voltages or V
PP
control circuits
—Self-timed
—No erase before write
—No complex programming algorithms
—No overerase problem
• Low power CMOS
—40mA active current max.
—200µA standby current max.
• Fast write cycle times
—64-byte page write operation
—Byte or page write cycle: 2ms typical
—Complete memory rewrite: 0.25 sec. typical
—Effective byte write cycle time: 32µs typical
• Software data protection
• End of write detection
—DATA polling
—Toggle bit
• High reliability
—Endurance: 1 million cycles
—Data retention: 100 years
• JEDEC approved byte-wide pin out
DESCRIPTION
The X28HC64 is an 8K x 8 EEPROM, fabricated with
Intersil’s proprietary, high performance, floating gate
CMOS technology. Like all Intersil programmable non-
volatile memories, the X28HC64 is a 5V only device. It
features the JEDEC approved pinto for byte-wide mem-
ories, compatible with industry standard RAMs.
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.
Intersil EEPROMs are designed and tested for appli-
cations requiring extended endurance. Inherent data
retention is greater than 100 years.
PIN CONFIGURATIONS
Plastic DIP
Flat Pack
CERDIP
1
2
3
4
5
6
8
9
10
11
12
13
14
28
27
26
25
24
23
21
20
19
18
17
16
15
V
CC
WE
NC
A
8
A
9
A
11
OE
A
10
CE
I/O
7
I/O
6
I/O
5
I/O
4
I/O
3
A
6
A
5
A
4
A
3
A
2
A
1
A
0
NC
I/O
0
5
6
7
8
9
10
11
12
29
28
27
26
A
8
A
9
A
11
NC
OE
A
10
CE
I/O
7
I/O
6
I/O
1
12
I/O
0
11
A
1
9
A
3
7
A
5
I/O
2
13
A
0
10
A
2
8
LCC
PLCC
V
CC
WE
A
12
NC
NC
NC
A
7
TSOP
A2
A1
A0
I/O 0
I/O 1
I/O 2
NC
VSS
NC
I/O 3
I/O 4
I/O 5
I/O 6
I/O 7
CE
A10
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
A3
A4
A5
A6
A7
A 12
NC
NC
VCC
NC
WE
NC
A8
A9
A 11
OE
SOIC
NC
A
12
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
I/O
0
I/O
1
I/O
2
V
SS
4
3
2
1 32 31 30
X28HC64
7 X28HC64 22
X28HC64
(Top View)
25
24
23
22
13
21
14 15 16 17 18 19 20
I/O
1
I/O
2
I/O
3
I/O
4
V
SS
I/O
5
NC
PGA
I/O
3
15
V
SS
14
I/O
5
17
I/O
4
16
CE
20
I/O
6
18
I/O
7
19
A
10
21
A
11
23
A
8
25
NC
26
X28HC64
A
4
OE
6 (BOTTOM 22
VIEW)
A
12
2
A
7
3
V
CC
28
NC
1
A
9
24
WE
27
5
A
6
4
Bottom View
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
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Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
INTERSIL [ INTERSIL CORPORATION ]
