X28HC64
®
64k, 8k x 8-Bit
Data Sheet
August 28, 2009
5 Volt, Byte Alterable EEPROM
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.
FN8109.2
• 70ns access time
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 applications
requiring extended endurance. Inherent data retention is
greater than 100 years.
• Simple byte and page write
- Single 5V supply
- No external high voltages or VPP 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: 100000 cycles
- Data retention: 100 years
• JEDEC approved byte-wide pin out
• Pb-free available (RoHS compliant)
Pinouts
A3
7 X28HC64 22
OE
A2
8
21
A10
A1
9
20
CE
A0
10
19
I/O7
I/O0
11
18
I/O6
I/O1
12
17
I/O5
I/O2
13
16
I/O4
VSS
14
15
I/O3
1
NC
A11
5
29
A8
A5
6
28
A9
A4
7
27
A11
A3
8
26
NC
A2
9
A1
X28HC64
(Top View)
25
OE
10
24
A10
A0
11
23
CE
NC
12
22
I/O7
13
21
14 15 16 17 18 19 20
I/O6
I/O0
I/O5
23
VCC
6
WE
A4
A6
I/O4
A9
NC
A8
24
1 32 31 30
I/O3
25
5
A12
4
A5
2
NC
A6
NC
26
VSS
3
3
WE
A7
4
VCC
27
A7
28
2
I/O2
1
I/O1
NC
A12
NC
X28HC64
(32 LD PLCC)
TOP VIEW
X28HC64
(28 LD PDIP, SOIC)
TOP VIEW
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005-2006, 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
