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參數(shù)資料
| 型號： | AT24C21-10PI-2.5 |
| 廠商： | ATMEL CORP |
| 元件分類： | DRAM |
| 英文描述： | 2-Wire Serial EEPROM |
| 中文描述： | 128 X 8 I2C/2-WIRE SERIAL EEPROM, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, MS-001BA, DIP-8 |
| 文件頁數(shù)： | 6/13頁 |
| 文件大?。?/td> | 252K |
| 代理商： | AT24C21-10PI-2.5 |
AT24C21
6
Bidirectional Mode (DDC2)
This mode supports a 2-wire, Bidirectional data transmis-
sion protocol. The AT24C21 can be switched into the Bidi-
rectional Mode by issuing a valid high to low transition on
the SCL pin (refer to Figure 3). After the device is in the
Bidirectional Mode, all inputs to the VCLK pin are ignored,
except when a logic high is required to enable write capa-
bility. All byte and page writes and byte and sequential
reads are supported in this mode.
Bidirectional Mode Operation
CLOCK and DATA TRANSITIONS:
The SDA pin is nor-
mally pulled high with an external device. Data on the SDA
pin may change only during SCL low time periods (refer to
Data Validity timing diagram). Data changes during SCL
high periods will indicate a start or stop condition as
defined below.
START CONDITION:
A high-to-low transition of SDA with
SCL high is a start condition which must precede any other
command (refer to Start and Stop Definition timing dia-
gram).
STOP CONDITION:
A low-to-high transition of SDA with
SCL high is a stop condition. After a read or write
sequence, the stop command will place the EEPROM in a
standby power mode (refer to Start and Stop Definition tim-
ing diagram).
ACKNOWLEDGE:
All addresses and data words are seri-
ally transmitted to and from the EEPROM in 8-bit words.
The EEPROM sends a zero to acknowledge that it has
received each word. This happens during the ninth clock
cycle.
Device Addressing
The AT24C21 requires an 8-bit device address word fol-
lowing a start condition to enable the chip for a read or
write operation (refer to Figure 4).
The device address word consists of a mandatory one,
zero sequence for the first four most significant bits as
shown. This is common to all the EEPROM devices.
The next three bits are don’t care for the AT24C21.
The eighth bit of the device address is the read/write opera-
tion select bit. A read operation is initiated if this bit is high
and a write operation is initiated if this bit is low.
Upon a compare of the device address, the EEPROM will
output a zero. If a compare is not made, the chip will return
to a standby state.
STANDBY MODE:
The AT24C21 features a low power
standby mode which is enabled: (a) upon power-up and (b)
after the receipt of the STOP bit and the completion of any
internal operations.
MEMORY RESET:
After an interruption in protocol, power
loss or system reset, any 2-wire part can be reset by follow-
ing these steps:
(a) Clock up to 9 cycles, (b) look for SDA high in each cycle
while SCL is high and then (c) create a start condition as
SDA is high.
Figure 3.
Mode Transition
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AT24C21-10SC-2.5 | 2-Wire Serial EEPROM |
| AT24C21-10SI-2.5 | 2-Wire Serial EEPROM |
| AT24C21 | Triple 3-Input Positive-NOR Gate 14-TSSOP -40 to 85 |
| AT24C32-10PI-1.8 | CAP 2.2UF 16V 10% TANT SMD-3216-18 TR-13 |
| AT24C64-10PI-1.8 | CAP 2.2UF 16V 10% TANT SMD-3216-18 TR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT24C21-10SC-2.5 | 功能描述:電可擦除可編程只讀存儲器 1K (128X8) 2.5V 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(shí)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 |
| AT24C21-10SI-2.5 | 功能描述:IC EEPROM 1KBIT 100KHZ 8SOIC 制造商:microchip technology 系列:- 包裝:管件 零件狀態(tài):停產(chǎn) 存儲器類型:非易失 存儲器格式:EEPROM 技術(shù):EEPROM 存儲容量:1Kb （128 x 8） 時(shí)鐘頻率:100kHz 寫周期時(shí)間 - 字，頁:10ms 訪問時(shí)間:3.5μs 存儲器接口:I2C 電壓 - 電源:2.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C（TA） 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商器件封裝:8-SOIC 基本零件編號:AT24C21 標(biāo)準(zhǔn)包裝:100 |
| AT24C256-10CI-1.8 | 制造商:Atmel Corporation 功能描述:Serial EEPROM, 32K x 8, 8 Pin, Plastic, LCC |
| AT24C256-10CI-2.7 | 制造商:Atmel Corporation 功能描述:Serial EEPROM, 32K x 8, 8 Pin, Plastic, LCC |
| AT24C256-10PC | 功能描述:IC EEPROM 256KBIT 1MHZ 8DIP 制造商:microchip technology 系列:- 包裝:管件 零件狀態(tài):停產(chǎn) 存儲器類型:非易失 存儲器格式:EEPROM 技術(shù):EEPROM 存儲容量:256Kb （32K x 8） 時(shí)鐘頻率:1MHz 寫周期時(shí)間 - 字，頁:10ms 訪問時(shí)間:550ns 存儲器接口:I2C 電壓 - 電源:4.5 V ~ 5.5 V 工作溫度:0°C ~ 70°C（TA） 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商器件封裝:8-PDIP 基本零件編號:AT24C256 標(biāo)準(zhǔn)包裝:50 |
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