DS1248Y-70IND

Overview

The DS1248Y-70IND is a non-volatile SRAM module with an integrated phantom real-time clock, manufactured by Analog Devices Inc./Maxim Integrated. It features 128K x 8 memory organization and operates within a voltage range of 4.5V to 5.5V. The device provides a 70ns access time and supports parallel interface communication via a standard 32-pin JEDEC pinout in a 32-EDIP package. It includes an embedded lithium energy source for data retention exceeding 10 years without power. The component maintains calendar operation with automatic leap year compensation valid up to the year 2100.

Feature Summary

• Integrates 128K x 8 NV SRAM with a phantom real-time clock accessible via serial bit stream pattern recognition.
• Includes an embedded lithium energy cell that automatically switches on during power failures to maintain data and clock operation.
• Features automatic leap year compensation valid through the year 2100 and maintains time accuracy within ±1 minute per month at +25°C.
• Supports 12-hour or 24-hour time formats and BCD-formatted register access.

Applications

• Industrial control systems requiring persistent timekeeping and data storage.
• Embedded systems needing non-volatile memory replacement for volatile SRAM or EEPROM.
• Equipment requiring precise calendar tracking with long-term battery backup capabilities.

Procurement Notes

Verify the specific suffix IND indicates the industrial temperature grade (-40°C to +85°C) as defined in the ordering information. Confirm the package type matches the required 32-EDIP form factor. Ensure the system voltage supply aligns with the 4.5V to 5.5V operating range specified for this variant. Check for RoHS compliance status if required by local regulations.

Selection Notes

Select the DS1248Y-70IND when an industrial temperature range is required alongside 70ns access speed. Compare against the commercial grade DS1248Y-70+ if the application environment remains within 0°C to +70°C. Consider the DS1248W variants only if a 3.3V supply is available, noting the different access times. Ensure the design accommodates the specific 64-bit pattern recognition sequence for phantom clock access.

Part Context

This component belongs to the DS1248 series of 1024K NV SRAM modules with phantom clocks. It is pin-for-pin compatible with the DS1244P and DS1251P devices. The 'Y' designation typically refers to the 5V supply version, while 'IND' specifies the extended industrial temperature range. The device replaces traditional volatile RAM solutions by combining memory and timekeeping in a single DIP module.

Replacement Considerations

Pin-for-pin compatible replacements include the DS1244P and DS1251P. Verify that substitute components support the same phantom clock protocol and memory density. Ensure the replacement part meets the -40°C to +85°C temperature requirement if operating in industrial environments.