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X28VC256T-45 데이터시트 PDF




Xicor에서 제조한 전자 부품 X28VC256T-45은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 X28VC256T-45 자료 제공

부품번호 X28VC256T-45 기능
기능 5 Volt/ Byte Alterable E2PROM
제조업체 Xicor
로고 Xicor 로고


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X28VC256T-45 데이터시트, 핀배열, 회로
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 WriteCell
—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
A12
A7
A6
A5
A4
A3
A2
A1
A0
I/O0
I/O1
I/O2
VSS
1 28
2 27
3 26
4 25
5 24
6 23
7 22
X28VC256
8 21
9 20
10 19
11 18
12 17
13 16
14 15
VCC
WE
A13
A8
A9
A11
OE
A10
CE
I/O7
I/O6
I/O5
I/04
I/O3
3869 FHD F02
A6
A5
A4
A3
A2
A1
A0
NC
I/O0
4 3 2 1 32 31 30
5 29
6 28
7 27
8 26
9
X28VC256
25
10 24
11 23
12 22
13 21
14 15 16 17 18 19 20
A8
A9
A11
NC
OE
A10
CE
I/O7
I/O6
3869 FHD F03
A2
A1
A0
I/O0
I/O1
I/O2
NC
VSS
NC
I/O3
I/O4
I/O5
I/O6
I/O7
CE
A10
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
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




X28VC256T-45 pdf, 반도체, 판매, 대치품
X28VC256
DATA POLLING I/O7
Figure 2. DATA Polling Bus Sequence
LAST
WE WRITE
CE
OE
VIH
I/O7
A0–A14
An
HIGH Z
VOL
An An
An
An
VOH
X28VC256
READY
An An
3869 FHD F12
Figure 3. DATA Polling Software Flow
WRITE DATA
WRITES
COMPLETE?
NO
YES
SAVE LAST DATA
AND ADDRESS
DATA Polling can effectively halve the time for writing to
the X28VC256. The timing diagram in Figure 2 illus-
trates the sequence of events on the bus. The software
flow diagram in Figure 3 illustrates one method of
implementing the routine.
READ LAST
ADDRESS
IO7
COMPARE?
YES
NO
X28VC256
READY
3869 FHD F13
4

4페이지










X28VC256T-45 전자부품, 판매, 대치품
X28VC256
SOFTWARE DATA PROTECTION
Figure 6. Timing Sequence—Byte or Page Write
VCC
0V
DATA
ADDRESS
AA
5555
CE
55
2AAA
WE
A0
5555
tBLC MAX
WRITES
OK
BYTE
OR
PAGE
tWC
(VCC)
WRITE
PROTECTED
3869 FHD F16
Figure 7. Write Sequence for
Software Data Protection
WRITE DATA AA
TO ADDRESS
5555
WRITE DATA 55
TO ADDRESS
2AAA
WRITE DATA A0
TO ADDRESS
5555
WRITE DATA XX
TO ANY
ADDRESS
WRITE LAST
BYTE TO
LAST ADDRESS
BYTE/PAGE
LOAD ENABLED
OPTIONAL
BYTE OR
PAGE WRITE
ALLOWED
AFTER tWC
RE-ENTERS DATA
PROTECTED STATE
3869 FHD F17
Regardless of whether the device has previously been
protected or not, once the software data protection
algorithm is used and data has been written, the
X28VC256 will automatically disable further writes un-
less another command is issued to cancel it. If no further
commands are issued the X28VC256 will be write
protected during power-down and after any subsequent
power-up.
Note: Once initiated, the sequence of write operations
should not be interrupted.
7

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부품번호상세설명 및 기능제조사
X28VC256T-45

5 Volt/ Byte Alterable E2PROM

Xicor
Xicor

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