| Part Number | DS1501WS+ | DS1501WSN+ | 
|---|---|---|
| Manufacturer | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | 
| Category | Clock/Timing - Real Time Clocks | Clock/Timing - Real Time Clocks | 
|   |   | |
| Product Status | Obsolete | Obsolete | 
| Type | Clock/Calendar | Clock/Calendar | 
| Features | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K | 
| Memory Size | 256B | 256B | 
| Time Format | HH:MM:SS (24 hr) | HH:MM:SS (24 hr) | 
| Date Format | YY-MM-DD-dd | YY-MM-DD-dd | 
| Interface | Parallel | Parallel | 
| Voltage - Supply | 3V ~ 3.6V | 3V ~ 3.6V | 
| Voltage - Supply, Battery | 2.5V ~ 3.7V | 2.5V ~ 3.7V | 
| Current - Timekeeping (Max) | 4mA @ 3V ~ 3.6V | 4mA @ 3V ~ 3.6V | 
| Operating Temperature | 0°C ~ 70°C | -40°C ~ 85°C | 
| Mounting Type | Surface Mount | Surface Mount | 
| Package / Case | 28-SOIC (0.295", 7.50mm Width) | 28-SOIC (0.295", 7.50mm Width) | 
| Supplier Device Package | 28-SOIC | 28-SOIC |