X28VC256 Datasheet, PDF (1/24 Pages) Xicor Inc. – 5 Volt, Byte Alterable E2PROM

X28VC256
256K
X28VC256
5 Volt, Byte Alterable E²PROM
32K x 8 Bit
FEATURES
• Access Time: 45ns
• 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:
—Active: 80mA
—Standby: 10mA
• Software Data Protection
—Protects Data Against System Level
Inadvertent Writes
• High Speed Page Write Capability
• Highly Reliable Direct Write^™ Cell
—Endurance: 100,000 Write Cycles
—Data Retention: 100 Years
• Early End of Write Detection
—DATA Polling
—Toggle Bit Polling
PIN CONFIGURATION
DESCRIPTION
The X28VC256 is a second generation high perfor-
mance CMOS 32K x 8 E²PROM. It is fabricated with
Xicor’s proprietary, textured poly floating gate tech-
nology, providing a highly reliable 5 Volt only nonvolatile
memory.
The X28VC256 supports a 128-byte page write opera-
tion, effectively providing a 24µs/byte write cycle and
enabling the entire memory to be typically rewritten in
less than 0.8 seconds. The X28VC256 also features
DATA Polling and Toggle Bit Polling, two methods of
providing early end of write detection. The X28VC256
also supports the JEDEC standard Software Data Pro-
tection feature for protecting against inadvertent writes
during power-up and power-down.
Endurance for the X28VC256 is specified as a minimum
100,000 write cycles per byte and an inherent data
retention of 100 years.
PLASTIC DIP
CERDIP
FLAT PACK
SOIC
LCC
PLCC
A14 1
28
VCC
A12 2
27 WE
4 3 2 1 32 31 30
A2
1
A7 3
A6 4
26
A13
25
A8
A6 5
A5 6
29 A8
28 A9
A1
2
A0
3
I/O0
4
A5 5
24
A9
A4 6
23
A11
A3
7
22
X28VC256
OE
A2 8
21
A10
A4 7
A3 8
A2 9
A1 10
X28VC256
27 A11
26 NC
25 OE
24 A10
I/O1
I/O2
NC
VSS
NC
I/O3
5
6
7
8
9
10
A1 9
20 CE
A0 11
23 CE
I/O4
11
A0 10
I/O0 11
I/O1 12
I/O2 13
19
18
17
I/O7 NC 12
22 I/O7
I/O6 I/O0 13
21 I/O6
I/O5
14 15 16 17 18 19 20
I/O5
I/O6
I/O7
CE
12
13
14
15
16
I/04
A10
16
VSS 14
15
I/O3
3869 FHD F02
3869 FHD F03
TSOP
X28VC256
32
A3
31
A4
30
A5
29
A6
28
A7
27
A12
26
A14
25
NC
24
VCC
23
NC
22
WE
21
A13
20
A8
19
A9
18
A11
17
OE
3869 ILL F22
©Xicor, Inc. 1991, 1995 Patents Pending
3869-2.6 4/2/96 T4/C4/D0 NS
1
Characteristics subject to change without notice