The DS1647/DS1647P is a nonvolatile timekeeping RAM with an internal battery that provides over 10 years of operation in the absence of power. The device has a standard JEDEC byte-wide 128k x 8 RAM pinout and is pin-for-pin compatible with other densities of DS164XP Timekeeping RAM.
The DS1647/DS1647P is a nonvolatile static RAM device that integrates SRAM, a real-time clock, crystal, and power-fail control circuitry. It provides BCD-coded year, month, date, day, hours, minutes, and seconds with automatic leap year compensation valid up to 2100. The device is available in a 32-pin DIP module or a 34-pin PowerCap module board.
| Memory Capacity | 512k x 8 |
|---|---|
| Clock Accuracy (DIP) | +1 minute per month |
| Clock Accuracy (PowerCap) | +1.53 minutes per month |
| Operating Temperature (Commercial) | 0°C to +70°C |
| Supply Voltage | 4.5V to 5.5V |
The DS1647 DIP module is guaranteed to keep time accuracy to within +1 minute per month at 25°C.
The device is guaranteed to keep time within plus or minus one minute per month.
The module typically keeps time within plus or minus 1.53 minutes per month.
The device requires a supply voltage of at least 4.5 volts for normal operation.