- 您现在的位置：买卖IC网 > PDF目录1994 > DS1554W-120IND (Maxim Integrated Products)IC RTC RAM Y2K 3.3V 120NS 32EDIP PDF资料下载
参数资料
| 型号： | DS1554W-120IND |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/18页 |
| 文件大小： | 0K |
| 描述： | IC RTC RAM Y2K 3.3V 120NS 32EDIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 11 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，NVSRAM，监视计时器，Y2K |
| 存储容量： | 32KB |
| 时间格式： | HH:MM:SS（24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | 并联 |
| 电源电压： | 2.97 V ~ 3.63 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 32-DIP 模块（0.600"，15.24mm） |
| 供应商设备封装： | 32-EDIP |
| 包装： | 管件 |
DS1554 256k, Nonvolatile, Y2K-Compliant Timekeeping RAM
6 of 18
BATTERY LONGEVITY
The DS1554 has a lithium power source that is designed to provide energy for the clock activity, and
clock and RAM data retention when the VCC supply is not present. The capability of this internal power
supply is sufficient to power the DS1554 continuously for the life of the equipment in which it is
installed. For specification purposes, the life expectancy is 10 years at 25
C with the internal clock
oscillator running in the absence of VCC. Each DS1554 is shipped from Maxim with its lithium energy
source disconnected, guaranteeing full energy capacity. When VCC is first applied at a level greater than
VPF, the lithium energy source is enabled for battery backup operation. Actual life expectancy of the
DS1554 will be much longer than 10 years since no internal battery energy is consumed when VCC is
present.
INTERNAL BATTERY MONITOR
The DS1554 constantly monitors the battery voltage of the internal batter. The Battery Low Flag (BLF)
bit of the Flags Register (B4 of 7FFF0h) is not writeable and should always be a 0 when read. If a 1 is
ever present, an exhausted lithium energy source is indicated and both the contents of the RTC and RAM
are questionable.
POWER-ON RESET
A temperature compensated comparator circuit monitors the level of VCC. When VCC falls to the power-
fail trip point, the
RST signal (open drain) is pulled low. When V
CC returns to nominal levels, the RST
signal continues to be pulled low for a period of 40 ms to 200 ms. The power-on reset function is
independent of the RTC oscillator and thus is operational whether or not the oscillator is enabled.
CLOCK OPERATIONS
Table 2 and the following paragraphs describe the operation of RTC, alarm, and watchdog functions.
相关PDF资料 |
PDF描述 |
|---|---|
| DS1556WP-120IND | IC RTC RAM Y2K 3.3V 120NS 34PCM |
| DS1557P-70IND | IC RTC RAM Y2K 5V 70NS 34PCM |
| DS1558Y-TRL | IC RTC W/NV RAM 5V 48-TQFP |
| DS1602+ | IC COUNTER ELAPSED TIME 5V 8-DIP |
| DS1603+ | IC COUNTER ELAPSED TIME 5V 7-SIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1554W-120IND+ | 功能描述:实时时钟 256kB NV RAM Timekeeper 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 |
| DS1554W-150 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:256K NV Y2KC Timekeeping RAM |
| DS1554WP | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Real-Time Clock |
| DS1554WP-120 | 功能描述:实时时钟 256kB NV RAM Timekeeper 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 |
| DS1554WP-120+ | 功能描述:实时时钟 256kB NV RAM Timekeeper 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 |
发布紧急采购，3分钟左右您将得到回复。