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Product Detailed Parameters
- Description：IC RTC CLK/CALENDAR SPI 20SOIC
- Series：-
- Package：Tube
- Mfr：Intersil
- Type：Clock/Calendar
- Features：Alarm, Leap Year, Square Wave Output, Watchdog Timer
- Memory Size：32B
- Time Format：HH:MM:SS (12/24 hr)
- Date Format：YY-MM-DD-dd
- Interface：SPI
- Voltage - Supply：3V ~ 6V
- Voltage - Supply, Battery：2.2V ~ 6V
- Current - Timekeeping (Max)：20µA ~ 500µA @ 5V
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
- Package / Case：20-SOIC (0.295", 7.50mm Width)
- Supplier Device Package：20-SOIC
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Overview
The CDP68HC68T1M is a Real-Time Clock (RTC) integrated circuit manufactured by Intersil, belonging to the CDP68HC68 family. It provides clock/calendar functionality with a 32-byte RAM storage capacity and communicates via an SPI interface. The device supports HH:MM:SS time format and YY-MM-DD date format. It operates within a supply voltage range of 3V to 6V and features alarm capabilities, leap year compensation, square wave output, and a watchdog timer. The component is designed for surface-mount installation in a 20-SOIC package.
Feature Summary
- Integrated RTC with 32-byte non-volatile RAM
- SPI serial interface for data communication
- Supports 12/24 hour time formats and calendar functions
- Includes alarm, leap year, and watchdog timer features
Applications
- Data logging systems requiring precise timestamping
- Industrial control units needing real-time tracking
- Embedded devices with power-failure time retention needs
Procurement Notes
Verify the manufacturer designation as Intersil or its successor Renesas Electronics Corporation, as corporate acquisitions may affect part numbering conventions. Confirm the specific suffix 'M' corresponds to the SOIC package variant and check current availability status, as older CMOS components may be subject to end-of-life notices.
Selection Notes
Select this component when an SPI-based RTC with moderate RAM capacity is required. Ensure the system design accommodates the 3V-6V operating voltage range. Verify that the PCB layout supports the 20-SOIC footprint and that the microcontroller host supports the necessary SPI protocol for register access.
Part Context
This part belongs to the CDP68HC68 series of specialty microprocessor circuits focused on timing applications. It shares functional similarities with other variants like the CDP68HC68T1MZ but differs in packaging and specific manufacturing lot details. The series was originally developed by Harris Semiconductor before being acquired by Intersil and subsequently Renesas.
Replacement Considerations
Direct pin-compatible replacements include the CDP68HC68T1MZ in the same 20-SOIC package. Verify electrical parameters such as supply current and operating temperature range (-40°C to 85°C) against the new component datasheet to ensure compatibility.
