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參數(shù)資料
| 型號： | CAT28HT256 |
| 英文描述： | 256K-Bit CMOS Parallel EEPROM(5V,快速，低功耗，256K位（32K x 8位）并行CMOS EEPROM) |
| 中文描述： | 256K位CMOS并行的EEPROM（5V的，快速，低功耗，256K位（32K的× 8位）并行的CMOS EEPROM的） |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 218K |
| 代理商： | CAT28HT256 |
CAT28HT256
8-98
Advanced
Stock No. 21065-03 2/98
Note:
(1)
Write protection is activated at this point whether or not any more writes are completed. Writing to addresses must occur within t
BLC
Max., after SDP activation.
HARDWARE DATA PROTECTION
The following is a list of hardware data protection fea-
tures that are incorporated into the CAT28HT256.
(1) V
CC
sense provides for write protection when V
CC
falls below 3.5V min.
(2) A power on delay mechanism, t
INIT
(see AC charac-
teristics), provides a 5 to 10 ms delay before a write
sequence, after V
CC
has reached 3.5V min.
(3) Write inhibit is activated by holding any one of
OE
low,
CE
high or
WE
high.
(4) Noise pulses of less than 20 ns on the
WE
or
CE
inputs will not result in a write cycle.
SOFTWARE DATA PROTECTION
The CAT28HT256 features a software controlled data
protection scheme which, once enabled, requires a data
algorithm to be issued to the device before a write can be
performed. The device is shipped from Catalyst with the
software protection NOT ENABLED (the CAT28HT256
is in the standard operating mode).
Figure 9. Write Sequence for Activating Software
Data Protection
Figure 10. Write Sequence for Deactivating
Software Data Protection
WRITE DATA:
AA
ADDRESS:
5555
WRITE DATA:
55
ADDRESS:
2AAA
WRITE DATA:
80
ADDRESS:
5555
WRITE DATA:
AA
ADDRESS:
5555
WRITE DATA:
55
ADDRESS:
2AAA
WRITE DATA:
20
ADDRESS:
5555
5096 FHD F08
5096 FHD F09
PRSOFTWARE DATA
WRITE DATA:
XX
WRITE LAST BYTE
TO
LAST ADDRESS
TO ANY ADDRESS
WRITE DATA:
AA
ADDRESS:
5555
WRITE DATA:
55
ADDRESS:
2AAA
WRITE DATA:
A0
ADDRESS:
5555
(1)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CAT28LV256G25 | 功能描述:電可擦除可編程只讀存儲器 (32kx8) 256K 3V 250 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| CAT28LV256G-25 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Catalyst Semiconductor 功能描述: |
| CAT28LV256G-25T | 功能描述:電可擦除可編程只讀存儲器 256K-Bit Parallel 電可擦除可編程只讀存儲器 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| CAT28LV256G-30 | 功能描述:電可擦除可編程只讀存儲器 (32kx8) 256K 3V 300 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| CAT28LV256G-30T | 功能描述:電可擦除可編程只讀存儲器 256K-Bit Parallel 電可擦除可編程只讀存儲器 RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
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