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參數資料
| 型號： | W28V400TT85C |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | PROM |
| 英文描述： | 4M(512K x 8/256K x 16) SMARTVOLTAGE FLASH MEMORY |
| 中文描述： | 256K X 16 FLASH 2.7V PROM, 120 ns, PDSO48 |
| 封裝： | 12 X 20 MM, TSOP-48 |
| 文件頁數： | 44/48頁 |
| 文件大小： | 1822K |
| 代理商： | W28V400TT85C |
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W28V400B/T
- 44 -
12. FLASH MEMORY W28V400 FAMILY DATA PROTECTION
Noises having a level exceeding the limit specified in this document may be generated under specific
operating conditions on some systems.
Such noises, when induced onto #WE signal or power supply, may be interpreted as false commands,
and which will cause undesired memory updating.
To protect the data stored in the flash memory against unwanted overwriting, systems operating with
the flash memory should have the following write protect designs, as appropriate:
1. Protecting data in specific block
By setting a #WP to low, only the boot block can be protected against overwriting.
Parameter and main blocks cannot be locked.
System program, etc., can be locked by storing them in the boot block.
When a high voltage is applied to #RESET, overwrite operation is enabled for all blocks.
2. Data protection through V
PP
When the level of V
PP
is lower than V
PPLK
(lockout voltage), write operation on the flash
memory is disabled. All blocks are locked and the data in the blocks are completely write
protected.
3. Data protection through #RESET
When the #RESET is kept low during power up and power down sequence such as voltage
transition, write operation on the flash memory is disabled, write protecting all blocks.
4. Noise rejection of #WE
Consider noise rejection of #WE in order to prevent false write command input.
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相關代理商/技術參數 |
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| W28WH | 制造商:ETERNA 功能描述:TRACKLIGHT, FLEXIBLE TRACK COUPLER |
| W28-X01B-3 | 制造商:TE Connectivity 功能描述: |
| W28-X1015-3.70 | 功能描述:斷路器 W28-X1015-3.70=W28 RoHS:否 制造商:Phoenix Contact 產品:Device Circuit Breakers 產品類型:Thermomagnetic 電流額定值:2 A 電壓額定值 AC:240 V, 277 V 電壓額定值 DC:50 V 極數:1 Pole 執行器類型:Slide 電路功能:Trip Free 系列:CB TM1 工作溫度范圍:- 30 C to + 60 C 照明:No |
| W28-X1024-3.20 | 功能描述:斷路器 CIRCUIT BREAKER THERMAL 32VDC 250VAC RoHS:否 制造商:Phoenix Contact 產品:Device Circuit Breakers 產品類型:Thermomagnetic 電流額定值:2 A 電壓額定值 AC:240 V, 277 V 電壓額定值 DC:50 V 極數:1 Pole 執行器類型:Slide 電路功能:Trip Free 系列:CB TM1 工作溫度范圍:- 30 C to + 60 C 照明:No |
| W28-X1029-5 | 功能描述:斷路器 W28-X1029-5=W28 RoHS:否 制造商:Phoenix Contact 產品:Device Circuit Breakers 產品類型:Thermomagnetic 電流額定值:2 A 電壓額定值 AC:240 V, 277 V 電壓額定值 DC:50 V 極數:1 Pole 執行器類型:Slide 電路功能:Trip Free 系列:CB TM1 工作溫度范圍:- 30 C to + 60 C 照明:No |
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