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參數(shù)資料
| 型號： | S-29291A |
| 廠商： | Seiko Instruments Inc. |
| 英文描述： | 128-Word x 16-Bit CMOS Serial EEPROM(2K位CMOS串行EEPROM) |
| 中文描述： | 128字× 16位的CMOS串行EEPROM（2K位的CMOS串行EEPROM的） |
| 文件頁數(shù)： | 11/44頁 |
| 文件大?。?/td> | 213K |
| 代理商： | S-29291A |
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CMOS SERIAL E
2
PROM
S-29X91A Series
10
Seiko Instruments Inc.
Connecting to the CPU with Serial Port
Memory Protection
The S-29X91A Series is capable of protecting the memory. So, the contents of the memory will not be miswritten due
to error run or malfunction of the CPU. When the PROTECT terminal is connected to GND or OPEN, write to Bank 1
in the memory array is prohibited (50% of the memory can be protected starting from address 00). Because the pull-
down resistance is connected to the PROTECT terminal internally, the memory can be automatically protected when
the PROTECT terminal is OPEN. When the protection is valid, the data in the memory of Bank 1 will not be rewritten.
However, because the write control circuit inside the IC functions, the next instruction cannot be executed during the
time period of writing (t
PR
). While write instruction is being input and write is being executed, always connect the
PROTECT terminal to ”H,” ”L” or OPEN, and leave the input signal unchanged (see Figure 13).
Figure 11 Connectin Example
Figure 12 Serial Shift Timing
S-29X91A
SO
SI
DI
DO
I/O
SK
CPU
SK
CS
DO
7
DO
6
DO
5
DO
4
DO
3
DO
2
DO
1
DO
0
DI
7
DI
6
DI
5
DI
4
DI
3
DI
2
DI
1
DI
0
SK
SI
SO
CPU data output
CPU data fetch
Figure 13 PROTECT Terminal Input Signal Timing
CS
VERIF
Write Instruction Input
DO
busy
Hi-Z
Hi-Z
ready
t
PR
0.2 s Min.
0.2 s Min.
PROTECT
DI
SK
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PDF描述 |
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| S-2934AR | CMOS 4K- bit serial E2PROM Compatible with NMC93C66, NS code |
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| S-2934AI | CMOS 4K- bit serial E2PROM Compatible with NMC93C66, NS code |
| S-29355A | CMOS 4Kbit Serial EEPROM(4K位 CMOS 串行EEPROM) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S-29291ADP | 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:CMOS SERIAL EEPROM |
| S-29291AFJ | 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:CMOS SERIAL EEPROM |
| S-29294A | 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:CMOS SERIAL EEPROM |
| S-29294ADP | 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:CMOS SERIAL EEPROM |
| S-29294AFJ | 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:CMOS SERIAL EEPROM |
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