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參數(shù)資料
| 型號： | DS1557WP-120 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | Timer or RTC |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
| 封裝： | POWERCAP MODULE-34 |
| 文件頁數(shù)： | 12/19頁 |
| 文件大?。?/td> | 331K |
| 代理商： | DS1557WP-120 |
DS1557 4Meg, Nonvolatile, Y2K-Compliant Timekeeping RAM
2 of 19
ORDERING INFORMATION
PART
TEMP RANGE
VOLTAGE
(V)
PIN-PACKAGE
TOP MARK**
DS1557P-70
0°C to +70°C
5.0
34 PowerCap*
DS1557P-70
DS1557P-70+
0°C to +70°C
5.0
34 PowerCap*
DS1557P+70
DS1557P-70IND
-40°C to +85°C
5.0
34 PowerCap*
DS1557P-70
DS1557P-70IND+
-40°C to +85°C
5.0
34 PowerCap*
DS1557P+70
DS1557WP-120
0°C to +70°C
3.3
34 PowerCap*
DS1557WP-120
DS1557WP-120+
0°C to +70°C
3.3
34 PowerCap*
DS1557WP+120
DS1557WP-120IND
-40°C to +85°C
3.3
34 PowerCap*
DS1557WP-120
DS1557WP-120IND+
-40°C to +85°C
3.3
34 PowerCap*
DS1557WP+120
+ Denotes a lead(Pb)-free/RoHS-compliant device.
* DS9034PCX (PowerCap) required. Must be ordered separately.
*An “IND” on the top mark denotes an industrial temperature grade device.
DESCRIPTION
The DS1557 is a full-function, year-2000-compliant (Y2KC), real-time clock/calendar (RTC) with an
RTC alarm, watchdog timer, power-on reset, battery monitor, and 512k x 8 nonvolatile static RAM. User
access to all registers within the DS1557 is accomplished with a byte-wide interface as shown in Figure
1. The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour
BCD format. Corrections for day of month and leap year are made automatically.
The RTC registers are double-buffered into an internal and external set. The user has direct access to the
external set. Clock/calendar updates to the external set of registers can be disabled and enabled to allow
the user to access static data. Assuming the internal oscillator is turned on, the internal set of registers is
continuously updated; this occurs regardless of external registers settings to guarantee that accurate RTC
information is always maintained.
The DS1557 has interrupt (
IRQ/FT) and reset (RST) outputs which can be used to control CPU activity.
The
IRQ/FT interrupt output can be used to generate an external interrupt when the RTC register values
match user programmed alarm values. The interrupt is always available while the device is powered from
the system supply and can be programmed to occur when in the battery-backed state to serve as a system
wakeup. Either the
IRQ/FT or RST outputs can also be used as a CPU watchdog timer, CPU activity is
monitored and an interrupt or reset output will be activated if the correct activity is not detected within
programmed limits. The DS1557 power-on reset can be used to detect a system power down or failure
and hold the CPU in a safe reset state until normal power returns and stabilizes; the
RST output is used
for this function.
The DS1557 also contains its own power-fail circuitry, which automatically deselects the device when the
VCC supply enters an out-of-tolerance condition. This feature provides a high degree of data security
during unpredictable system operation brought on by low VCC levels.
相關PDF資料 |
PDF描述 |
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| DS1557P-70 | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
| DS1620R | DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), RECTANGULAR, SURFACE MOUNT |
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| DS1620+ | DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), RECTANGULAR, SURFACE MOUNT |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS1557WP-120+ | 功能描述:實時時鐘 4M NV RAM Timekeeper 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 時間格式:HH:MM:SS RTC 存儲容量: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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1557WP-120IND | 功能描述:實時時鐘 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 時間格式:HH:MM:SS RTC 存儲容量: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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1557WP-120IND+ | 功能描述:實時時鐘 4M NV RAM Timekeeper 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 時間格式:HH:MM:SS RTC 存儲容量: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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1557WP-150 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:4MEG NV Y2KC Timekeeping RAM |
| DS1558 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Watchdog Clock with NV RAM Control |
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