- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄97865 > DS1994L-F5 (DALLAS SEMICONDUCTOR) SPECIALTY MEMORY CIRCUIT, MRDB2 PDF資料下載
參數(shù)資料
| 型號： | DS1994L-F5 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Memory IC:Other |
| 英文描述： | SPECIALTY MEMORY CIRCUIT, MRDB2 |
| 封裝： | MICRO CAN |
| 文件頁數(shù)： | 18/23頁 |
| 文件大?。?/td> | 537K |
| 代理商： | DS1994L-F5 |
DS1992/DS1993/DS1994
4 of 23
102199
PARASITE POWER
The block diagram (Figure 1) shows the parasite-powered circuitry. This circuitry “steals” power
whenever the data input is high. The data line will provide sufficient power as long as the specified
timing and voltage requirements are met. The advantages of parasite power are two-fold: 1) by parasiting
off this input, lithium is conserved and 2) if the lithium is exhausted for any reason, the ROM may still be
read normally.
64-BIT LASERED ROM
Each DS199X contains a unique ROM code that is 64 bits long. The first eight bits are a 1-Wire family
code. The next 48 bits are a unique serial number. The last eight bits are a CRC of the first 56 bits. (See
Figure 2.) The 1-wire CRC is generated using a polynomial generator consisting of a shift register and
XOR gates as shown in Figure 3. The polynomial is X
8 + X5 + X4 + 1. Additional information about the
Dallas 1-Wire Cyclic Redundancy Check is available in the Book of DS19xx iButton Standards. The shift
register bits are initialized to zero. Then starting with the least significant bit of the family code, one bit at
a time is shifted in. After the 8th bit of the family code has been entered, then the serial number is
entered. After the 48th bit of the serial number has been entered, the shift register contains the CRC
value. Shifting in the eight bits of CRC should return the shift register to all zeros.
64-BIT LASERED ROM Figure 2
FAMILY
CODE
04h
=
DS1994
06h
=
DS1993
08h
=
DS1992
LSB
SERIAL
NUMBER
48-BIT
UNIQUE
NUMBER
CRC
8 BITS
MSB
1-WIRE CRC CODE Figure 3
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1993L-F5 | SPECIALTY MEMORY CIRCUIT, MRDB2 |
| DS1992L-F5 | SPECIALTY MEMORY CIRCUIT, MRDB2 |
| DS1996L-F5 | SPECIALTY MEMORY CIRCUIT, MADB2 |
| DS2016 | 2K X 8 STANDARD SRAM, 100 ns, PDIP24 |
| DS2118MB | 9-LINE 110 ohm SCSI BUS TERMINATOR, PDSO36 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1994L-F5+ | 功能描述:iButton RoHS:否 存儲類型:SRAM 存儲容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
| DS1994L-F5-W | 功能描述:iButton RoHS:否 存儲類型:SRAM 存儲容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
| DS1994-LFS | 制造商: 功能描述: 制造商:undefined 功能描述: |
| DS1995 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:16-kbit Memory iButton |
| DS1995L-F5 | 功能描述:iButton RoHS:否 存儲類型:SRAM 存儲容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。