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參數(shù)資料
| 型號(hào)： | S-29U394A |
| 廠商： | Seiko Instruments Inc. |
| 英文描述： | 4Kbit CMOS Serial EEPROM(4K位CMOS串行EEPROM) |
| 中文描述： | 4Kbit的CMOS串行EEPROM（4K的位的CMOS串行EEPROM的） |
| 文件頁數(shù)： | 8/41頁 |
| 文件大小： | 185K |
| 代理商： | S-29U394A |
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CMOS SERIAL E
2
PROM
S-29UX94A Series
Seiko Instruments Inc.
7
3.
Write enable (PEN) and Write disable (PDS)
The PEN instruction puts the S-29UX94A Series into write enable mode, which accepts PROGRAM instruction. The
PDS instruction puts the S-29UX94A Series into write disable mode, which refuses PROGRAM instruction.
The S-29UX94A Series powers on in write disable mode, which protects data against unexpected, erroneous write
operations caused by noise and/or CPU malfunctions. It should be kept in write disable mode except when performing
write operations.
Receiving a Start-Bit
A start-bit can be recognized by latching the high level of DI at the rising edge of SK after changing CS to low (Start-
Bit Recognition). The write operation begins by inputting the write instruction and setting CS to high. The DO pin
then outputs low during the write operation and high at its completion by setting CS to low (Verify Operation).
Therefore, only after a write operation, in order to accept the next command by having CS go low, the DO pin is
switched from a state of high-impedence to a state of data output; but if it recognizes a start-bit, the DO pin returns
to a state of high-impedence (see Figure 3).
Three-wire Interface (DI-DO direct connection)
Figure 7 PEN/PDS Timing
Make sure that data output from the CPU does not interfere with the data output from the serial memory IC when
you configure a 3-wire interface by connecting DI input pin and DO output pin. Such interference may cause a start-
bit fetch problem.
Although the normal configuration of a serial interface is a 4-wire interface to CS, SK, DI, and DO, a 3-wire interface
is also a possibility by connecting DI and DO. However, since there is a possibility that the DO output from the serial
memory IC will interfere with the data output from the CPU with a 3-wire interface, install a resistor between DI and
DO in order to give preference to data output from the CPU to DI (See Figure 8).
Figure 8 3-wire interface
DI
DO
SIO
CPU
S-29UX94A
R : 10 100 k
11=PEN
00=PDS
0
0
X
1
2
3
4
5
6
7
8
DI
CS
SK
X
X
16
X
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| S-29UX94A | The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each |
| S-29UXX0A | The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each |
| S-29UXX1A | The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each |
| S-29U131A | The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each |
| S-29U131ADFE | The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S-29UX94A | 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:CMOS SERIAL EEPROM |
| S-29UXX0A | 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:CMOS SERIAL EEPROM |
| S-29UXX1A | 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:CMOS SERIAL EEPROM |
| S2-9V | 制造商:Panasonic Electric Works 功能描述: |
| S29VS064RABBHI000 | 功能描述:閃存 64Mb 1.8V 108Mhz Parallel NOR 閃存 RoHS:否 制造商:ON Semiconductor 數(shù)據(jù)總線寬度:1 bit 存儲(chǔ)類型:Flash 存儲(chǔ)容量:2 MB 結(jié)構(gòu):256 K x 8 定時(shí)類型: 接口類型:SPI 訪問時(shí)間: 電源電壓-最大:3.6 V 電源電壓-最小:2.3 V 最大工作電流:15 mA 工作溫度:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體: 封裝:Reel |
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