X28HC64
64K
X28HC64
8K x 8 Bit
5 Volt, Byte Alterable E2PROM
FEATURES
• High Reliability
—Endurance: 100,000 Cycles
• 55ns 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,
effectively providing a 32µs/byte write cycle and en-
abling 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 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
NC
NC
V
NC
WE
NC
A
A
A
2
1
0
0
1
2
3
4
5
6
7
12
PLASTIC DIP
LCC
FLAT PACK
PLCC
NC
CERDIP
SOIC
V
SS
NC
I/O
I/O
I/O
I/O
I/O
X28HC64
9
CC
10
11
12
13
14
15
16
3
4
5
6
7
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
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
28
27
26
25
24
23
22
21
CE
9
A
OE
10
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 8/5/97 T1/C0/D0 EW
Characteristics subject to change without notice
1
XICOR [ XICOR INC. ]
