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Product Detailed Parameters
- Description：IC RTC PHANTOM CHIP PAR 34PCM
- Series：-
- Package：Tray
- Mfr：Analog Devices Inc./Maxim Integrated
- Type：Phantom Time Chip
- Features：NVSRAM
- Memory Size：128KB
- 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：0°C ~ 70°C
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
- Package / Case：34-PowerCap™ Module
- Supplier Device Package：34-PowerCap Module
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Overview
The DS1248YP-70+ is a nonvolatile RAM (NV SRAM) integrated with a phantom real-time clock, manufactured by Analog Devices Inc./Maxim Integrated. It provides 128K x 8 bits of memory and operates within a voltage range of 4.5V to 5.5V. The device features a 34-pin PowerCap module package designed for surface mount applications. It includes an embedded lithium energy source that maintains calendar operation and retains data during power failures. Key specifications include a maximum timekeeping current of 10mA at 5V and an operating temperature range of 0°C to 70°C.
Feature Summary
- Integrated 128K x 8 NV SRAM with phantom clock functionality
- Embedded lithium energy source for data retention and RTC operation
- Automatic leap year compensation valid up to the year 2100
- Over 10 years of data retention in the absence of power
Applications
- Systems requiring nonvolatile memory with persistent timekeeping
- Industrial equipment needing reliable calendar and clock functions
- Devices requiring direct replacement for volatile static RAM or EEPROM
Procurement Notes
Verify the requirement for the separate DS9034PCX+ or DS9034I-PCX+ PowerCap component, as it is not included with the DS1248YP-70+. Confirm that the application supports the 34-pin PowerCap surface mount package rather than the standard 32-pin DIP module. Ensure the system voltage remains within the 4.5V to 5.5V range for proper operation.
Selection Notes
Select the DS1248YP-70+ when a surface-mount solution with an external battery/crystal module is preferred over a DIP package. This model is suitable for commercial temperature ranges (0°C to +70°C). For industrial temperatures (-40°C to +85°C), consider the DS1248YP-70IND+ variant. Ensure the host interface supports the parallel access required for both memory and phantom clock registers.
Part Context
The DS1248 series combines 1024K-bit NV SRAM with a phantom clock. The DS1248YP-70+ specifically utilizes the 34-pin PowerCap module format. It is pin-for-pin compatible with the DS1244P and DS1251P in terms of logical addressing, though physical packages differ. The 'Y' suffix indicates the commercial temperature grade, while 'P' denotes the PowerCap package type.
Replacement Considerations
The DS1248YP-70+ is pin-compatible with the DS1244P and DS1251P logical interfaces. However, physical replacement requires matching the 34-pin PowerCap footprint. Verify if the existing design accommodates the separate PowerCap module assembly process.
