实时时钟 Real-Time Clocks
Description
The DS12885, DS12887, and DS12C887 real-time clocks RTCs are designed to be direct replacements for the DS1285 and DS1287. The devices provide a real-time clock/calendar, one time-of-day alarm, three maskable interrupts with a common interrupt output, a programmable square wave, and 114 bytes of battery-backed static RAM 113 bytes in the DS12C887 and . The DS12887 integrates a quartz crystal and lithium energy source into a 24-pin encapsulated DIP package. The DS12C887 adds a century byte at address 32h. For all devices, the date at the end of the month is automatically adjusted for months with fewer than 31 days, including correction for leap years. The devices also operate in either 24-hour or 12-hour format with an AM/PM indicator. A precision temperature-compensated circuit monitors the status of VCC. If a primary power failure is detected, the device automatically switches to a backup supply. A lithium coin-cell battery can be connected to the VBAT input pin on the DS12885 to maintain time and date operation when primary power is absent. The device is accessed through a multiplexed byte-wide interface, which supports both Intel and Motorola modes.
电源电压DC 4.50V min
输出接口数 8
时钟频率 32.8 kHz
内存容量 113 B
电源电压 4.5V ~ 5.5V
安装方式 Through Hole
引脚数 24
封装 DIP-24
封装 DIP-24
工作温度 0℃ ~ 70℃
产品生命周期 Unknown
包装方式 Tube
制造应用 Security Systems, Network Hubs, Bridges, and Routers, Utility Meters, Embedded Systems
RoHS标准 Non-Compliant
含铅标准 Contains Lead
型号/品牌 | 代替类型 | 替代型号对比 |
---|---|---|
DS12C887A Maxim Integrated 美信 | 当前型号 | 当前型号 |
DS12C887A+ 美信 | 完全替代 | DS12C887A和DS12C887A+的区别 |