DS1248Y-120

Overview

The DS1248Y-120 is a nonvolatile real-time clock and static RAM module manufactured by Analog Devices Inc./Maxim Integrated. It integrates a 128KB (1Mbit) NV SRAM with a phantom clock mechanism to maintain timekeeping during power outages. The device operates on a parallel interface and supports date formats of YY-MM-DD-dd and time formats of HH:MM:SS:hh in both 12-hour and 24-hour modes. It functions within a supply voltage range of 2.97V to 3.63V or 4.5V to 5.5V, with a maximum timekeeping current of 10mA at 5V. The component is housed in a 32-DIP Module package and is rated for operation between 0°C and +70°C.

Feature Summary

• Integrates 128KB nonvolatile SRAM with phantom clock technology for continuous timekeeping
• Supports leap year calculation and multiple time/date formats
• Dual voltage supply options: 2.97V–3.63V or 4.5V–5.5V
• Parallel bus interface with 32-DIP Module packaging

Applications

• Industrial systems requiring persistent time and data storage
• Embedded controllers needing backup memory capabilities
• Equipment operating in environments with intermittent power availability

Procurement Notes

Verify the specific suffix requirements for the DS1248Y-120 model to ensure compatibility with system voltage levels and temperature ranges. Confirm package authenticity as the component utilizes a specialized DIP module form factor. Check for RoHS compliance status if environmental regulations apply to the target assembly process.

Selection Notes

Select this component when a combined RTC and large nonvolatile memory solution is required without external battery management circuits. Ensure the host system supports parallel interfacing and can accommodate the 32-pin DIP module footprint. Verify that the operating environment remains within the specified 0°C to +70°C temperature range.

Part Context

This part belongs to the Maxim Integrated line of nonvolatile real-time clocks. It combines standard RTC functionality with substantial SRAM capacity, distinguishing it from basic timekeeping chips. The phantom clock feature allows the internal oscillator to continue running even when main power is removed, provided a backup source is connected.

Replacement Considerations

Direct replacements may include other DS1248 series variants with different speed grades or package options. Cross-referencing pinouts and electrical specifications is essential when substituting with similar NVSRAM RTC modules from the same manufacturer.