|
|
|
부품번호 | X28VC256JI-55 기능 |
|
|
기능 | 5 Volt/ Byte Alterable E2PROM | ||
제조업체 | Xicor | ||
로고 | |||
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
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
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 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
7페이지 | |||
구 성 | 총 24 페이지수 | ||
다운로드 | [ X28VC256JI-55.PDF 데이터시트 ] |
당사 플랫폼은 키워드, 제품 이름 또는 부품 번호를 사용하여 검색할 수 있는 |
구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
X28VC256JI-55 | 5 Volt/ Byte Alterable E2PROM | Xicor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |