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Product Detailed Parameters
- Description：IC RTC PHANTOM CHIP PAR 32EDIP
- Series：-
- Package：Tube
- Mfr：Analog Devices Inc./Maxim Integrated
- Type：Phantom Time Chip
- Features：Leap Year, NVSRAM
- Memory Size：512KB
- Time Format：HH:MM:SS:hh (12/24 hr)
- Date Format：YY-MM-DD-dd
- Interface：Parallel
- Voltage - Supply：2.97V ~ 3.63V
- Voltage - Supply, Battery：-
- Current - Timekeeping (Max)：7mA @ 3.3V
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Through Hole
- Grade：-
- Qualification：-
- Package / Case：32-DIP Module (0.600", 15.24mm)
- Supplier Device Package：32-EDIP
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Overview
The DS1251W-120IND+ is a nonvolatile SRAM integrated with a phantom clock real-time controller, manufactured by Analog Devices Inc./Maxim Integrated. It provides 512K x 8 bits of memory and maintains timekeeping data via an embedded lithium energy cell. The device operates on a parallel interface with a 120 ns access time and supports a supply voltage range of 2.97V to 3.63V. It features automatic leap year compensation valid up to the year 2100 and ensures over 10 years of data retention without power. The component is housed in a 32-pin EDIP module package designed for through-hole mounting.
Feature Summary
- Integrates 512K x 8 NV SRAM with a phantom clock RTC for calendar and timekeeping functions
- Includes an embedded lithium energy source that automatically switches during power failures
- Provides automatic leap year compensation valid up to the year 2100
- Ensures over 10 years of data retention in the absence of VCC power
Applications
- Systems requiring persistent timekeeping and nonvolatile data storage
- Industrial control systems operating within -40°C to +85°C environments
- Equipment needing direct replacement for volatile static RAM or EEPROM
Procurement Notes
Verify the specific ordering suffix IND+ confirms the industrial temperature range (-40°C to +85°C) and lead-free compliance. Confirm the package type matches the required 32-pin EDIP form factor for through-hole integration. Ensure the design accommodates the 2.97V to 3.63V supply voltage requirements for proper operation.
Selection Notes
Select this model when a combined RTC and large capacity NVSRAM solution is needed in a DIP module format. The 120 ns speed suits applications where high-speed parallel access is not critical. Consider the PowerCap variant if surface-mount assembly is preferred, as it requires a separate battery module.
Part Context
This part belongs to the DS1251 series of 4096K NV SRAMs with phantom clocks. It is upward compatible with the DS1248 series. The 'W' designation indicates the commercial/industrial temperature grade variants, while 'IND+' specifies the industrial range and RoHS compliance.
Replacement Considerations
The datasheet notes upward compatibility with the DS1248 series. Verify pinout and electrical characteristics against existing designs before substitution.
