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Product Detailed Parameters
- Description：IC RTC PHANTOM CHIP PAR 34PCM
- 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：4.5V ~ 5.5V
- Voltage - Supply, Battery：3V
- Current - Timekeeping (Max)：10mA @ 5V
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
- Package / Case：34-PowerCap™ Module
- Supplier Device Package：34-PowerCap Module
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Overview
The DS1251YP-70IND is a nonvolatile SRAM integrated with a phantom clock, packaged in a 34-pin PowerCap Module. It provides 512K x 8 memory organization and operates within a 4.5V to 5.5V supply range. The device features automatic leap year compensation valid through 2100 and maintains data for over 10 years via an embedded lithium energy cell. It utilizes a parallel interface with 19 address lines and 8 data lines. The industrial temperature grade supports operation from -40°C to +85°C.
Feature Summary
- Integrated 512K x 8 NV SRAM with phantom clock timekeeping
- Automatic leap year compensation valid up to 2100
- Embedded lithium battery ensures over 10 years of data retention
- Parallel interface compatible with standard JEDEC pinouts
Applications
- Industrial control systems requiring persistent time and data storage
- Data logging equipment needing nonvolatile memory backup
- Telecommunications infrastructure maintaining calendar operations
- Medical devices requiring reliable real-time tracking
Procurement Notes
Verify the specific suffix IND+ confirms the -40°C to +85°C industrial temperature rating. Confirm that the separate DS9034PCX+ or DS9034I-PCX+ PowerCap module is included, as it is required for operation but ordered separately. Ensure the package type matches the 34-PowerCap Module specification for surface mount integration.
Selection Notes
Select this component when a combined RTC and large NVRAM solution is required without external battery management circuits. The 70ns access time suits moderate-speed microcontroller interfaces. Compare against the 3.3V variants if system voltage differs. Verify compatibility with the specific PowerCap module for crystal and battery integration.
Part Context
This part belongs to the DS1251 family of 4096K NV SRAMs with phantom clocks. It is functionally upward compatible with the DS1248 series. The 'P' designation indicates the PowerCap board-only package, distinguishing it from the DIP modules that integrate the battery internally. It serves as a drop-in replacement for volatile static RAM in applications requiring timekeeping.
Replacement Considerations
Direct substitutes include other DS1251 variants with different speed grades or voltage ranges, such as DS1251WP-120IND+. Cross-referencing with the DS1248 series is possible due to upward compatibility. Ensure any replacement matches the 34-pin PowerCap footprint and phantom clock protocol.
