DS12885：实时时钟
DS12885、DS12887和DS12C887实时时钟(RTC)可用来直接替代DS1285和DS1287。该器件提供一个实时时钟/日历、定时闹钟、三个可屏蔽中断(共用一个中断输出)、可编程方波输出和114字节的电池备份静态RAM (DS12C887和DS12C887A包含113字节RAM)。DS12887在24引脚模块DIP封装内集成了晶体和锂电池。DS12C887在地址32h内增加了世纪字节。对于少于31天的月份，所有器件的日期能够在月末自动调整，带有闰年补偿。该器件可配置为24小时或12小时格式，带AM/PM指示。精确的温度补偿电路用于监视的VCC状态。一旦检测到主电源失效，器件可自动切换到备用电源。钮扣式锂电池可以连接到DS12885的VBAT输入引脚，在主电源掉电时保持有效的时间和日期。该器件通过一个复用的、字节宽度接口访问，支持Intel和Motorola模式。
关键特性
| DS12885、DS12887、DS12887A、DS12C887、DS12C887A：典型工作电路 应用
|
数据手册DataSheet
| 语言 | 下载文件 | 备注 |
|---|---|---|
| 英文 | DS12885-DS12C887A.pdf | Rev 4; 05/2010 |
关键参数
| Part Number | Interface | VSUPPLY (V) | Time Keeping Current (nA) | CL (pF) | Memory Type | Memory Size (Bytes) | Time of Day Alarms | Functions | Package/Pins | Budgetary Price |
|---|---|---|---|---|---|---|---|---|---|---|
| typ | See Notes | |||||||||
| DS12885 | Multiplexed | 5 | 225 | 6 | NV SRAM | 114 | 1 | RTC |
| $3.50 @1k |
| DS12887 | - | - | 114 | EDIP/24 | $5.20 @1k | |||||
| DS12887A | - | - | 114 | EDIP/24 | $5.20 @1k | |||||
| DS12C887 | - | - | 113 | EDIP/24 | $5.04 @1k | |||||
| DS12C887A | - | - | 113 | EDIP/24 | $5.04 @1k | |||||
技术资料
- Tips for Writing Bulletproof Real-Time Clock Control Code
- State Machine Logic in Binary-Coded Decimal (BCD)-Formatted Real-Time Clocks
- Oscillator Design Considerations for Low-Current Applications
- Selecting a Backup Source for Real-Time Clocks
- Problems and Solutions for Adjusting to Changes in Daylight Saving Time
- Interface a Multiplexed-Bus Real-Time Clock to a µP With Separate Address and Data Buses
- Using the DS32kHz with Maxim Real-Time Clocks
- Using Multiplexed Bus Clocks with a Microcontroller
- Lithium Coin-Cell Batteries: Predicting an Application Lifetime
- Design Considerations for Maxim Real-Time Clocks
- Crystal Considerations with Maxim Real-Time Clocks (RTCs)
质量和环境数据
订购型号
| 型号 | 状况 | 推荐替代产品 | 封装 | 温度 | RoHS/无铅 |
|---|---|---|---|---|---|
| DS12885 | 停止供货 | DS12885+ | PDIP(W),；24引脚；520.4mm² | 0°C至+70°C | RoHS/无铅：否 |
| DS12885+ | 生产中 | PDIP(W),；24引脚；520.4mm² | 0°C至+70°C | RoHS/无铅：无铅 | |
| DS12885N | 停止供货 | DS12885N+ | PDIP(W),；24引脚；520.4mm² | -40°C至+85°C | RoHS/无铅：否 |
| DS12885N+ | 生产中 | PDIP(W),；24引脚；520.4mm² | -40°C至+85°C | RoHS/无铅：无铅 | |
| DS12885Q | 停止供货 | DS12885Q+ | PLCC,；28引脚；158mm² | 0°C至+70°C | RoHS/无铅：否 |
| DS12885Q+ | 生产中 | PLCC,；28引脚；158mm² | 0°C至+70°C | RoHS/无铅：无铅 | |
| DS12885Q+T&R | 生产中 | PLCC,；28引脚；158mm² | 0°C至+70°C | RoHS/无铅：无铅 | |
| DS12885Q/T&R | 停止供货 | DS12885Q+T&R | PLCC,；28引脚；158mm² | 0°C至+70°C | RoHS/无铅：否 |
| DS12885QN | 停止供货 | DS12885QN+ | PLCC,；28引脚；158mm² | -40°C至+85°C | RoHS/无铅：否 |
| DS12885QN+ | 生产中 | PLCC,；28引脚；158mm² | -40°C至+85°C | RoHS/无铅：无铅 | |
| 型号 | 状况 | 推荐替代产品 | 封装：类型 引脚 占位面积封装图 编码/变更 * | 温度 | RoHS/无铅？ |
| DS12885QN+T&R | 生产中 | PLCC,；28引脚；158mm² | -40°C至+85°C | RoHS/无铅：无铅 | |
| DS12885S | 停止供货 | DS12885S+ | SOIC(W),；24引脚；166.1mm² | 0°C至+70°C | RoHS/无铅：否 |
| DS12885S+ | 生产中 | SOIC(W),；24引脚；166.1mm² | 0°C至+70°C | RoHS/无铅：无铅 | |
| DS12885S+T&R | 生产中 | SOIC(W),；24引脚；166.1mm² | 0°C至+70°C | RoHS/无铅：无铅 | |
| DS12885SN | 停止供货 | DS12885SN+ | SOIC(W),；24引脚；166.1mm² | -40°C至+85°C | RoHS/无铅：否 |
| DS12885SN+ | 生产中 | SOIC(W),；24引脚；166.1mm² | -40°C至+85°C | RoHS/无铅：无铅 | |
| DS12885SN+T&R | 生产中 | SOIC(W),；24引脚；166.1mm² | -40°C至+85°C | RoHS/无铅：无铅 | |
| DS12885T | 停止供货 | DS12885T+ | TQFP,；32引脚；84.6mm² | 0°C至+70°C | RoHS/无铅：否 |
| DS12885T+ | 生产中 | TQFP,；32引脚；84.6mm² | 0°C至+70°C | RoHS/无铅：无铅 | |
| DS12885TN+ | 停止供货 | TQFP,；32引脚；84.6mm² | -40°C至+85°C | RoHS/无铅：无铅 |
- DS12885-DS12C887A.pdf DS12C887A
- Tips for Writing Bulletproof Real-Time Clock Control Code DS3234
- State Machine Logic in Binary-Coded Decimal (BCD)-Formatted Real-Time Clocks DS3234
- Oscillator Design Considerations for Low-Current Applications DS17885
- Selecting a Backup Source for Real-Time Clocks DS3234
- Problems and Solutions for Adjusting to Changes in Daylight Saving Time DS17887
- Interface a Multiplexed-Bus Real-Time Clock to a µP With Separate Address and Data Buses DS17887
- Using the DS32kHz with Maxim Real-Time Clocks DS17885
- Using Multiplexed Bus Clocks with a Microcontroller DS17887
- Lithium Coin-Cell Batteries: Predicting an Application Lifetime DS9034PCX
- Design Considerations for Maxim Real-Time Clocks DS3234
- Crystal Considerations with Maxim Real-Time Clocks (RTCs) DS3234
- DS12885.pdf DS12885
- DS12885-DS12C887A.pdf DS12C887A
