X28C64
64K
X28C64
5 Volt, Byte Alterable E2PROM
DESCRIPTION
8K x 8 Bit
FEATURES
• 150ns Access Time
The X28C64 is an 8K x 8 E2PROM, fabricated with
Xicor’s proprietary, high performance, floating gate
CMOS technology. Like all Xicor programmable non-
volatile memories the X28C64 is a 5V only device. The
X28C64 features the JEDEC approved pinout for byte-
widememories,compatiblewithindustrystandardRAMs.
• 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
The X28C64 supports a 64-byte page write operation,
effectively providing a 78µs/byte write cycle and en-
abling the entire memory to be typically written in 0.625
seconds. The X28C64 also features DATA and Toggle
Bit Polling, a system software support scheme used to
indicate the early completion of a write cycle. In addi-
tion, theX28C64includesauser-optionalsoftwaredata
protection mode that further enhances Xicor’s hard-
ware write protect capability.
• Low Power CMOS
—60mA Active Current Max.
—200µA Standby Current Max.
• Fast Write Cycle Times
—64 Byte Page Write Operation
—Byte or Page Write Cycle: 5ms Typical
—Complete Memory Rewrite: 0.625 sec. Typical
—Effective Byte Write Cycle Time: 78µs Typical
• Software Data Protection
• End of Write Detection
Xicor E2PROMs are designed and tested for applica-
tions requiring extended endurance. Inherent data re-
tention is greater than 100 years.
—DATA Polling
—Toggle Bit
• High Reliability
—Endurance: 100,000 Cycles
—Data Retention: 100 Years
• JEDEC Approved Byte-Wide Pinout
PIN CONFIGURATION
LCC
PLCC
PLASTIC DIP
CERDIP
FLAT PACK
SOIC
TSOP
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
NC
1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
2
1
0
0
1
2
3
4
5
6
7
12
CC
4
3
2
1
32 31 30
29
A
2
WE
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
9
4
A
8
A
9
11
5
NC
NC
OE
A
V
SS
NC
6
A
11
X28C64
9
X28C64
CC
7
OE
I/O
10
11
12
13
14
15
16
3
4
5
6
7
X28C64
10
11
12
13
I/O
I/O
I/O
I/O
10
8
A
10
CE
I/O
9
CE
8
9
11
NC
I/O
7
10
11
12
13
14
I/O
7
I/O
6
I/O
5
I/0
4
I/O
CE
0
6
I/O
0
1
2
14 15 16 17 18 19 20
A
OE
10
I/O
I/O
V
I/O
3
SS
3853 ILL F23.1
3853 FHD F03
3853 FHD F02
© Xicor, Inc. 1991, 1995 Patents Pending
3853-2.7 4/2/96 T0/C3/D2 NS
Characteristics subject to change without notice
1
XICOR [ XICOR INC. ]
