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参数资料
| 型号： | DS1501YS |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Timer or RTC |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封装： | 0.720 INCH, PLASTIC, SOIC-28 |
| 文件页数： | 12/30页 |
| 文件大小： | 291K |
| 代理商： | DS1501YS |
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DS1501/DS1511
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PIN DESCRIPTION
VCC
- Supply Voltage
A0-A4
- Address Inputs
DQ0-DQ7
- Data I/O
CE
- Chip Enable Input
OE
- Output Enable Input
WE
- Write Enable Input
IRQ
- Interrupt Output (Open Drain)
PWR
- Power-On Output (Open Drain)
RST
- Reset Output (Open Drain)
KS
- Kickstart Input
SQW
- Square Wave Output
VBAT
- Backup Battery Supply
VBAUX
- Auxiliary Battery Supply
X1, X2
- 32.768 kHz Crystal Pins
GND
- Ground
NC
- No Connection
DESCRIPTION
The DS1501/DS1511 is a full function, year 2000-compliant, real-time clock/calendar (RTC) with a RTC
alarm, watchdog timer, power-on reset, battery monitors, 256 bytes nonvolatile static RAM, and a
32.768 kHz output. User access to all registers within the DS1501 is accomplished with a bytewide
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. When the crystal oscillator is turned on, the internal set of registers are
continuously updated; this occurs regardless of external register settings to guarantee that accurate RTC
information is always maintained.
The DS1501/DS1511 contains its own power fail circuitry which automatically deselects the device when
the VCC supply falls below a power fail trip point. This feature provides a high degree of data security
during unpredictable system operation brought on by low VCC levels
The DS1501/DS1511 has interrupt ( IRQ), power control ( PWR ), and reset ( RST ) outputs which can be
used to control CPU activity. The IRQ interrupt or RST outputs can be invoked as the result of a time of
day alarm, CPU watchdog alarm, or a kick start signal. The DS1501/1511 power control circuitry allows
the system to be powered on via an external stimulus, such as a keyboard or by a time and date (wake-up)
alarm. The PWR output pin can be triggered by one or either of these events, and can be used to turn on
an external power supply. The PWR pin is under software control, so that when a task is complete, the
system power can then be shut down. The DS1501/DS1511 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 DS1501 is a clock/calendar chip with the features described above. An external crystal and battery
are the only components required to maintain time-of-day and memory status in the absence of power.
相关PDF资料 |
PDF描述 |
|---|---|
| DS1501WE | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| DS1553W-150 | 0 TIMER(S), REAL TIME CLOCK, PDIP28 |
| DS1553P-70 | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
| DS1553-70 | 0 TIMER(S), REAL TIME CLOCK, PDIP28 |
| DS1553WP-150 | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1501YS+ | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1501YS+T&R | 制造商:Maxim Integrated Products 功能描述:IC RTC WDOG Y2K 5V 28-SOIC |
| DS1501YS+T&R | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1501YSN | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1501YSN/T&R | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK PARALLEL 256BYTE 28SOIC - Tape and Reel |
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