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参数资料
| 型号： | DS2704G+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/18页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM 1.25KBIT 6TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 10,000 |
| 格式 - 存储器： | EEPROMs - 串行 |
| 存储器类型： | EEPROM |
| 存储容量： | 1.25K（32B x 5 页） |
| 接口： | 1 线 串行 |
| 电源电压： | 2.5 V ~ 5.5 V |
| 工作温度： | -30°C ~ 85°C |
| 封装/外壳： | 6-WDFN 裸露焊盘 |
| 供应商设备封装： | 6-TDFN 裸露焊盘（3x3） |
| 包装： | 带卷 (TR) |
DS2704: 1280-Bit EEPROM with SHA-1 Authentication
the 32-byte page is reached. If reading occurs through the end of the 32-byte page, the bus master can issue eight
additional read time slots and the DS2704 will respond with a 8-bit CRC of all data bytes read from the initial
starting byte through the last byte of the current page. After the CRC is received, additional read time slots return
data starting with the first byte of the next page. This sequence will continue until the bus master reads PAGE 3
and its accompanying CRC. Thus each page of data can be considered to be 33 bytes long: the 32 bytes of user-
programmed EEPROM data and an 8-bit CRC that gets generated automatically at the end of each page. The
Read Data/Generate 8-Bit CRC command sequence can be exited at any point by issuing a reset pulse.
READ ALL [65h]. The Read All command is used to read data from all 1280 bits (PAGE 0 – PAGE 4) of the
EEPROM data field. This includes PAGE 0 – PAGE 3 which are accessible via the DS2502 Read Memory and
Read Data/Gen CRC legacy commands and PAGE 4 which is only accessible using the Read All command.
The bus master follows the command byte with a 2-byte address (TA1=(T7:T0), TA2=(T15:T8)) that indicates a
starting byte location within the data field. An 8-bit CRC of the command byte and address bytes is computed by
the DS2704. The bus master must issue 8 read time slots to receive the CRC value, and then issue additional read
time slots to receive data from the DS2704 starting at TA2:TA1.
When reading begins within the EEPROM data field (0000h – 009Fh) and continues past 009Fh, an 8-bit CRC of
all data returned is computed by the DS2704 and returned following the last byte of the data field. If reading begins
in the reserved range or time slots are issued after receiving the 8-bit CRC, the DS2704 returns logical 1’s.
WRITE SCRATCHPAD [6Ch]. The Write Scratchpad command is used to write up to 8 bytes to the scratchpad
buffer which is in turn used to program 1280-bit EEPROM data field via the Copy Scratchpad command. The bus
master issues the Write Scratchpad function command followed by a 1-byte address argument that depicts the
starting byte position in the scratchpad of the following byte stream to be written. The valid range for the address is
00h – 07h. The address is auto-incremented after each data byte is written. When the address is greater than 07h,
no further bytes will be accepted. Incomplete bytes are not written to the scratchpad. The Write Scratchpad
command fills the scratchpad LSByte first, so when fewer than 8 bytes are written, the upper bytes of the
scratchpad buffer contain data from previous operations. Since the Copy Scratchpad command transfers the entire
scratchpad to the EEPROM data field, incomplete writing of the scratchpad should be done with caution. If the
master determines the scratchpad data is unsuitable to copy to the EEPROM, the entire write sequence (command
and data) must be repeated after issuing a reset pulse.
READ SCRATCHPAD [69h]. The Read Scratchpad command is used to return scratchpad data if verification of
the scratchpad data is required prior to programming the EEPROM data field. The bus master issues the Read
Scratchpad function command followed by a 1-byte address argument that depicts the starting byte position in the
scratchpad of the first byte to be read. The valid range for the address is 00h – 07h. The address is auto-
incremented after each data byte is read. When the address is greater than 07h, any further reads will return bit
values of 1. The DS2704 returns up to 64 bits from the scratchpad beginning with the least significant bit of the
least significant byte.
COPY SCRATCHPAD [48h] . The Copy Scratchpad function command is used to transfer data from the 8-byte
scratchpad buffer to the EEPROM data field memory. Transfers are aligned on 8-byte boundaries. The bus master
issues the Copy Scratchpad function command followed by the 2-byte target address (TA1=(T7:T0),
TA2=(T15:T8)). The DS2704 aligns target addresses to the least significant byte (LSByte) of each eight byte
boundary by zeroing the three least significant bits of TA1. That is, TA1[T2:T0] are set internally to 000b. As an
example, issuing the Copy Scratchpad command with TA2:TA1 = 0x0020 or TA2:TA1 = 0x0027 results in the same
8-byte block being copied to PAGE 1 beginning at address 0x0020.
A delay of t EEC is required to program the scratchpad contents to the EEPROM array. See Figure 9 for command
timing.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2704K | 功能描述:电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
| DS2704REVKIT+ | 制造商:Maxim Integrated Products 功能描述:RMS POWER DETECTOR - Boxed Product (Development Kits) |
| DS2704RG+ | 功能描述:电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
| DS2704RG+T&R | 功能描述:电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
| DS2704R-K | 功能描述:电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
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