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| Part Number | DS1644-120 | DS1646-120 | DS1644P-120 | DS1647-120 | DS1644-120+ |
|---|---|---|---|---|---|
| Manufacturer | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated |
| Product Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
| Type | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar |
| Features | Leap Year, NVSRAM | Leap Year, NVSRAM | Leap Year, NVSRAM | Leap Year, NVSRAM | Leap Year, NVSRAM |
| Memory Size | 32KB | 128KB | 32KB | 512KB | 32KB |
| Time Format | HH:MM:SS (24 hr) | HH:MM:SS (24 hr) | HH:MM:SS (24 hr) | HH:MM:SS (24 hr) | HH:MM:SS (24 hr) |
| Date Format | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd |
| Interface | Parallel | Parallel | Parallel | Parallel | Parallel |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Voltage - Supply, Battery | - | 3V | 3V | - | - |
| Current - Timekeeping (Max) | 4mA @ 4.5V ~ 5.5V | 4mA @ 4.5 V ~ 5.5 V | 4mA @ 4.5V ~ 5.5V | 4mA @ 4.5 V ~ 5.5 V | 4mA @ 4.5V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C |
| Mounting Type | Through Hole | Through Hole | Surface Mount | Through Hole | Through Hole |
| Package / Case | 28-DIP Module (0.600", 15.24mm) | 32-DIP Module (0.600", 15.24mm) | 34-PowerCap™ Module | 32-DIP Module (0.600", 15.24mm) | 28-DIP Module (0.600", 15.24mm) |
| Supplier Device Package | 28-EDIP | 32-EDIP | 34-PowerCap Module | 32-EDIP | 28-EDIP |
