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參數(shù)資料
| 型號(hào)： | WE128K8150CM |
| 元件分類： | PROM |
| 英文描述： | 128K X 8 EEPROM 5V MODULE, 150 ns, CDIP32 |
| 封裝： | SINGLE CAVITY, CERAMIC, DIP-32 |
| 文件頁(yè)數(shù)： | 3/13頁(yè) |
| 文件大小： | 133K |
| 代理商： | WE128K8150CM |
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White Microelectronics Phoenix, AZ (602) 437-1520
10
EEPROM
MODULES
11
HARDWARE DATA PROTECTION
Several methods of hardware data protection have been
implemented in the White Microelectronics EEPROM. These
are included to improve reliability during normal operations.
a) VCC power on delay
As VCC climbs past 3.8V typical the device will wait 5mSec
typical before allowing write cycles.
b) VCC sense
While below 3.8V typical write cycles are inhibited.
c) Write inhibiting
Holding OE low and either CS or WE high inhibits
write cycles.
d) Noise filter
Pulses of <8ns (typ) on WE or CS will not initiate a
write cycle.
(1)
FIG. 11
SOFTWARE BLOCK DATA
PROTECTION DISABLE ALGORITHM
SOFTWARE DATA PROTECTION
A software write protection feature may be enabled or disabled
by the user. When shipped by White Microelectronics, the
devices have the feature disabled. Write access to the device
is unrestricted.
To enable software write protection, the user writes three
access code bytes to three special internal locations. Once
write protection has been enabled, each write to the EEPROM
must use the same three byte write sequence to permit writing.
After setting software data protection, any attempt to write to
the device without the three-byte command sequence will start
the internal write timers. No data will be written to the device,
however, for the duration of tWC. The write protection feature
can be disabled by a six byte write sequence of specific data to
specific locations. Power transitions will not reset the
software write protection.
Each 32K byte block (128K bytes for the WE512K8) of EEPROM
has independent write protection. One or more blocks may be
enabled and the rest disabled in any combination. The
software write protection guards against inadvertent writes
during power transitions or unauthorized modification using a
PROM programmer. The block selection is controlled by the
A15 through A17 for the WE256K8, or A15 and A16 for the
WE128K8).
WE512K8, WE256K8, WE128K8-XCX
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 80
TO
ADDRESS 5555
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 20
TO
ADDRESS 5555
LOAD DATA XX
TO
ANY ADDRESS(4)
LOAD LAST BYTE
TO
LAST ADDRESS
NOTES:
1. Data Format: I/O7-0 (Hex);
Address Format: A14 -A0 (Hex).
A17 and A18 control selection of one of four blocks in the 512Kx8.
A15, A16, and A17 control selection of one of 8 pages in the 256Kx8.
A15 and A16 control one of the four blocks in the 128Kx8.
2. Write Protect state will be activated at end of write even if no other
data is loaded.
3. Write Protect state will be deactivated at end of write period even if
no other data is loaded.
4. 1 to 128 bytes of data at each of 4 blocks may be loaded in the
512Kx8. 1 to 64 bytes of data at each of 8 blocks may be loaded in the
256Kx8 and 1 to 64 bytes on 4 blocks in the 128Kx8.
EXIT DATA
PROTECT STATE(3)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| WE512K8300CI | 512K X 8 EEPROM 5V MODULE, 300 ns, CDIP32 |
| WE128K32-250G1UI | 128K X 32 EEPROM 5V MODULE, 250 ns, CQFP68 |
| WE128K32N-250H1IA | 128K X 32 EEPROM 5V MODULE, 250 ns, CPGA66 |
| WMS256K16L-20FGIA | 256K X 16 STANDARD SRAM, 20 ns, CDSO44 |
| WMS256K16-17FGCA | 256K X 16 STANDARD SRAM, 17 ns, CDSO44 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| WE128K8-150CM | 制造商:White Electronic Designs 功能描述:Res Thick Film 2512 30K Ohm 1% 1W ±100ppm/°C Molded SMD T/R 制造商:Microsemi Corporation 功能描述:128K X 8 EEPROM MODULE, 150NS, 32 DIP, MIL-SCREENED - Bulk |
| WE128K8-150CMA | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:512Kx8 CMOS EEPROM, WE512K8-XCX, SMD 5962-93091 |
| WE128K8-150CQ | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:512Kx8 CMOS EEPROM, WE512K8-XCX, SMD 5962-93091 |
| WE128K8-150CQA | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:512Kx8 CMOS EEPROM, WE512K8-XCX, SMD 5962-93091 |
| WE128K8-200CC | 制造商:Microsemi Corporation 功能描述:128K X 8 EEPROM MODULE, 200NS, 32 DIP, COMMERCIAL SCREENED - Bulk |
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