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Rochester Electronics DS1743-85+ Environmental and export classification status description

The DS1743-85+ is an integrated circuit that combines an RTC and NVSRAM in a single device. It provides accurate timekeeping along with the ability to store critical data even during power outages or system shutdowns. The NVSRAM uses a lithium energy source to retain data for an extended period. Functions: 1. Real-Time Clock (RTC): The chip provides accurate timekeeping with a programmable 32.768kHz crystal oscillator. 2. Nonvolatile Static RAM (NVSRAM): The 8KB of NVSRAM is byte-addressable and can store critical data even without power. 3. Battery Backup: The DS1743-85+ has an onboard lithium energy source that ensures data retention during power loss. 4. Control Logic: The integrated control logic manages the RTC and NVSRAM functions. Applications: 1. Data Logging: The DS1743-85+ is suitable for applications that require time-stamped data logging, such as industrial monitoring systems and data acquisition devices. 2. Power Metering: It can be used in power metering applications to record consumption data accurately. 3. Security Systems: The chip can store security codes and logs for surveillance systems or access control devices. 4. Automotive Systems: The DS1743-85+ can be utilized in automotive applications that require critical data storage and accurate timekeeping. Alternative Components: Some alternative components to the DS1743-85+ include: 1. DS1746: This device expands the NVSRAM capacity to 16KB. 2. DS1747: It is similar to the DS1743-85+ but includes additional features like a tamper-detection output. 3. MCP7940: This RTC with NVSRAM offers an I2C interface and has 512 bytes of NVSRAM. Embedded Modules: Although the DS1743-85+ is a standalone chip, it can be used in conjunction with microcontrollers or embedded systems to provide timekeeping and data storage functionalities. Related Q&A: 1. Q: How do I set the time on the DS1743-85+ RTC? A: The time can be set by configuring the appropriate register values using the provided clock control interface. 2. Q: Can the DS1743-85+ operate without a battery backup? A: No, the chip relies on the battery backup to retain data during power loss. 3. Q: Is the DS1743-85+ compatible with both 3.3V and 5V systems? A: Yes, the DS1743-85+ is designed to operate with both 3.3V and 5V power supply voltages. 4. Q: Can I replace the onboard battery of the DS1743-85+? A: Yes, the battery can be replaced when it reaches the end of its life cycle. 5. Q: Does the DS1743-85+ support alarm functionality? A: Yes, the chip provides alarm features, allowing you to set specific time-based event triggers.