X28HC64
64K
X28HC64
8K x 8 Bit
5 Volt, Byte Alterable E2PROM
FEATURES
• High Reliability
—Endurance: 1 Million Cycles
• 70ns Access Time
• Simple Byte and Page Write
—Single 5V Supply
—Data Retention: 100 Years
• JEDEC Approved Byte-Wide Pinout
—No External High Voltages or VPP Control
Circuits
—Self-Timed
DESCRIPTION
The X28HC64 is an 8K x 8 E2PROM, fabricated with
Xicor’s proprietary, high performance, floating gate
CMOS technology. Like all Xicor programmable non-
volatilememoriestheX28HC64isa5Vonlydevice. The
X28HC64featurestheJEDECapprovedpinoutforbyte-
widememories,compatiblewithindustrystandardRAMs.
—No Erase Before Write
—No Complex Programming Algorithms
—No Overerase Problem
• Low Power CMOS
—40 mA Active Current Max.
—200 µA 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
The X28HC64 supports a 64-byte page write operation,
effectivelyprovidinga32µs/bytewritecycleandenabling
the entire memory to be typically written in 0.25 seconds.
TheX28HC64alsofeaturesDATA PollingandToggleBit
Polling, two methods providing early end of write detec-
tion. In addition, the X28HC64 includes a user-optional
software data protection mode that further enhances
Xicor’s hardware write protect capability.
—DATA Polling
Xicor E2PROMs are designed and tested for applica-
tions requiring extended endurance. Inherent data re-
tention is greater than 100 years.
—Toggle Bit
TSOP
PIN CONFIGURATIONS
A
A
A
I/O
I/O
I/O
1
2
3
4
5
6
7
8
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
A
A
A
A
A
A
2
1
0
0
1
2
3
4
5
6
7
12
PLASTIC DIP
LCC
FLAT PACK
PLCC
NC
NC
NC
CERDIP
SOIC
V
SS
NC
I/O
I/O
I/O
I/O
I/O
X28HC64
9
V
NC
CC
10
11
12
13
14
15
16
3
4
5
6
7
WE
NC
NC
1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
4
3
2
1
32 31 30
29
CC
A
2
WE
A
A
A
8
9
11
12
A
A
A
A
A
A
A
5
6
7
8
9
A
A
A
6
5
4
3
2
1
0
8
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
3
NC
CE
28
27
26
25
24
23
22
21
9
A
10
OE
4
A
8
A
9
11
5
NC
OE
A
3857 ILL F22
X28HC64
PGA
6
A
11
10
11
12
13
7
OE
10
I/O
12
I/O
13
I/O
15
I/O
17
I/O
18
1
2
3
5
6
X28HC64
CE
8
A
10
NC
I/O
I/O
7
I/O
11
A
10
V
14
I/O
16
I/O
19
9
CE
0
0
SS
4
7
I/O
0
6
10
11
12
13
14
I/O
7
I/O
6
I/O
5
I/0
4
14 15 16 17 18 19 20
A
A
A
8
CE
20
A
21
1
3
2
4
10
11
I/O
0
1
2
9
7
I/O
I/O
V
X28HC64
A
6
OE
22
A
23
3857 FHD F03
I/O
3
A
A
V
28
A
24
A
25
SS
5
6
12
7
CC
9
8
5
4
2
3
3857 FHD F02.1
A
A
NC
1
WE
27
NC
26
3857 FHD F04
BOTTOM VIEW
© Xicor, Inc. 1994, 1995, 1996 Patents Pending
3857-3.0 2/24/99 T1/C0/D0 EW
Characteristics subject to change without notice
1