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| 型號(hào)： | DS1244Y |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | XO, clock |
| 英文描述： | 256K NV SRAM with Phantom Clock(帶幻影實(shí)時(shí)時(shí)鐘的非易失性SRAM) |
| 中文描述： | 0 TIMER(S), REAL TIME CLOCK, PDIP28 |
| 文件頁(yè)數(shù)： | 3/12頁(yè) |
| 文件大?。?/td> | 91K |
| 代理商： | DS1244Y |
DS1244Y
022798 3/12
PHANTOM CLOCK
REGISTER INFORMATION
The Phantom Clock information is contained in 8 regis-
ters of 8 bits, each of which is sequentially accessed one
bit at a time after the 64–bit pattern recognition se-
quence has been completed. When updating the Phan-
tom Clock registers, each register must be handled in
groups of 8 bits. Writing and reading individual bits with-
in a register could produce erroneous results. These
read/write registers are defined in Figure 2.
Data contained in the Phantom Clock register is in
binary coded decimal format (BCD). Reading and writ-
ing the registers is always accomplished by stepping
through all 8 registers, starting with bit 0 of register 0 and
ending with bit 7 of register 7.
PHANTOM CLOCK REGISTER DEFINITION
Figure 1
7
6
5
4
3
2
1
0
1
1
0
0
0
1
0
1
0
0
1
1
1
0
1
0
1
0
1
0
0
0
1
1
0
1
0
1
1
1
0
0
1
1
0
0
0
1
0
1
0
0
1
1
1
0
1
0
1
0
1
0
0
0
1
1
0
1
0
1
1
1
0
0
C5
3A
A3
5C
C5
3A
A3
5C
BYTE 0
BYTE 1
BYTE 2
BYTE 3
BYTE 4
BYTE 5
BYTE 6
BYTE 7
HEX
VALUE
NOTE:
The pattern recognition in Hex is C5, 3A, A3, 5C, C5, 3A, A3, 5C. The odds of this pattern being accidentally dupli-
cated and causing inadvertent entry to the Phantom Clock is less than 1 in 10
19
. This pattern is sent to the Phantom
Clock LSB to MSB.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1245AB | 1024K Nonvolatile SRAM(1024K 非易失性靜態(tài)RAM) |
| DS1245Y | 1024K Nonvolatile SRAM(1024K 非易失性靜態(tài)RAM) |
| DS1245W | 3.3V 1024K Nonvolatile SRAM(3.3V 1024K 非易失性靜態(tài)RAM) |
| DS1248Y | Using the Dallas Phantom Real Time Clocks(帶幻象實(shí)時(shí)時(shí)鐘的NVSRAM) |
| DS1249AB | 2048K Nonvolatile SRAM(2048K 非易失性靜態(tài)RAM) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1244Y120 | 制造商:Maxim Integrated Products 功能描述: |
| DS1244Y-120 | 制造商:Maxim Integrated Products 功能描述: |
| DS1244Y-150 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| DS1244Y-200 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:256K NV SRAM with Phantom Clock |
| DS1244Y-70 | 功能描述:實(shí)時(shí)時(shí)鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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