DS3231MZ/V+ - 5ppm I2C RTC in 8-SOIC | Analog Devices
料号： DS3231MZ/V+ ✓ 量产中DS3231MZ/V+ 概述
A real-time clock, or RTC, is a timing IC that preserves calendar and clock information independently of a system processor. In the product hierarchy, an RTC belongs to clock and timing ICs, then integrated circuits, and ultimately semiconductor devices. Unlike a simple counter driven by an external crystal, the DS3231MZ/V+ integrates the resonant timing element, oscillator circuitry, calendar logic, and battery-backed timekeeping into one 8-pin device.
Key features include ±5 ppm clock accuracy, temperature compensation, 2.3 V to 5.5 V operation, and an I2C-compatible two-wire serial interface rated for 400 kHz. The device supports continued operation from a coin-cell battery when the primary supply is unavailable, making it useful for wall-clock timestamps, event logging, and systems that must preserve time across resets or power interruptions. Its SOIC-8 surface-mount package also supports conventional PCB assembly and automated production.
The DS3231M family uses integrated microelectromechanical systems technology with a temperature-compensated MEMS resonator, providing accurate timekeeping without relying on an external discrete crystal. The DS3231MZ/V+ is identified by the verified distributor data as an 8-SOIC, 0.154-inch, 3.90 mm-wide I2C real-time clock. Its two-wire interface allows a host microcontroller or processor to read and write calendar and clock registers while minimizing connection count.
Typical uses include industrial control systems, environmental monitoring, data acquisition equipment, consumer appliances, embedded instruments, and network-connected IoT equipment. In each case, the device can maintain a consistent calendar reference while the main supply is cycling or the embedded controller is being reset. Its 5 ppm rating is particularly useful when timestamp accuracy matters more than the lower cost of a basic oscillator-only RTC.
Designers should provide a stable decoupling path between VCC and ground, confirm the pull-up requirements of the I2C bus, and ensure that the backup cell is installed with the correct polarity. Software must also account for the device's register structure and square-root-of-10 frequency register rather than treating it as a generic wall-clock component. Because the exact public pin names were not included in the supplied verified data, the pinout is reported as unavailable rather than reconstructed from memory.
This page combines verified manufacturer and distributor information, RoHS status, supply details, structured drop-in comparison candidates, pricing evidence, and practical implementation guidance. It is designed to help engineers evaluate the DS3231MZ/V+ for battery-backed timekeeping while separating verified facts from parameters that still require confirmation from the complete manufacturer datasheet.
直接替换替代料： DS3231MZ/V+ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： DS3231MZ/V+ （相同外形与封装尺寸） ——差异在于 Bus Interface, Device Type, Interface, Package, RoHS Status.
DS3231M+
✅ 直接替换联系询价
查看数据手册 →DS3231MZ+
✅ 直接替换联系询价
查看数据手册 →DS3231SN#T&R
✅ 直接替换联系询价
查看数据手册 →DS3232MZ+
✅ 直接替换📋 参考替代料（不在目录中）
DS3234SN#
✅ 直接替换📋 参考替代料（不在目录中）
DS3231MZ/V+ 规格参数
| Device Type | Real Time Clock (RTC) Clock/Calendar |
| Clock Accuracy | ±5 ppm |
| Supply Voltage Range | 2.3 V to 5.5 V |
| 工作温度范围 | -40 °C to +85 °C |
| Bus Interface | CMOS I2C, 2-wire serial |
| Maximum I2C Clock Frequency | 400 kHz |
| 封装 | 8-SOIC, 0.154 inch, 3.90 mm width |
| 安装类型 | Surface mount |
| Temperature Compensation | Temperature compensated |
| Timekeeping Source | Integrated microelectromechanical systems resonator |
| Backup Power Support | Battery input with timekeeping during main-power interruption |
| RoHS Compliance | RoHS compliant |
| Manufacturer Pin Count | 8 pins |
DS3231MZ/V+ 8-soic, 0.154 inch, 3.90 mm width 引脚配置指南
DS3231MZ/V+（8-soic, 0.154 inch, 3.90 mm width 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： DS3231MZ/V+.
请参阅 数据手册 以查看完整引脚配置。
典型应用
DS3231MZ/V+ 适用于 6 应用s: Industrial Control and Automation, Environmental Monitoring and Data Loggers, IoT Gateways and Connected Appliances, Battery-Backed Security and Access Equipment, Consumer Appliances and Smart Equipment, Test and Measurement Instruments.
Industrial Control and Automation
The DS3231MZ/V+ fits industrial controllers that must retain an accurate wall-clock reference during power interruptions or controller resets. Its ±5 ppm rating provides a more dependable timestamp basis than an uncompensated RTC, while the 2.3 V to 5.5 V supply range accommodates common embedded rails. The device is installed beside the host controller, with its I2C lines connected to the system bus and its backup cell maintaining the calendar when VCC falls. Because the 400 kHz interface is faster than many low-speed RTC buses, firmware can transfer time data efficiently. Engineers should still allow for regulator startup time, battery charging behavior, and loss of timekeeping during initial backup-cell installation.
推荐
Environmental Monitoring and Data Loggers
The DS3231MZ/V+ is appropriate for environmental monitors and data loggers where measurements must retain accurate calendar context during outages. A ±5 ppm real-time clock improves the consistency of timestamps used to compare temperature, humidity, and other sensor readings, while its integrated temperature-compensated MEMS resonator reduces dependence on an external crystal. The RTC can operate from 2.3 V to 5.5 V and communicate at 400 kHz over the I2C bus. In a remote logger, the backup battery preserves time while the main supply is unavailable, allowing the recovered system to identify the interruption period accurately.
推荐
IoT Gateways and Connected Appliances
DS3231MZ/V+ supports IoT gateways and connected appliances that need a persistent date and time after a network interruption or local power cycle. Its ±5 ppm accuracy provides a more useful event chronology than a basic RTC, and battery backup allows the device to maintain time while connectivity is unavailable. The 2.3 V to 5.5 V operating range permits use with both low-energy and 5 V system rails, and the 400 kHz I2C interface minimizes wiring between the RTC and host processor. Firmware should synchronize the RTC with a trusted server after restoration and handle invalid or reset time states explicitly.
推荐
Battery-Backed Security and Access Equipment
The DS3231MZ/V+ can support access-control and security equipment where event logs must retain an accurate time reference after power loss. The ±5 ppm accuracy helps order access events reliably, while the backup battery preserves the calendar during mains interruptions. Its 8-SOIC package supports automated assembly, and the two-wire 400 kHz interface leaves the remaining controller pins available for sensors, relays, or communications. Security designs should verify battery endurance, define behavior for a depleted backup cell, and synchronize time after a longer outage to prevent drift or an incorrect calendar.
推荐
Consumer Appliances and Smart Equipment
DS3231MZ/V+ is suitable for appliances and smart equipment that display schedules, log operating events, or preserve time through brief power interruptions. Its ±5 ppm timing performance is more consistent than a basic clock-only oscillator, and the wide 2.3 V to 5.5 V range simplifies integration with multiple embedded power architectures. The 400 kHz I2C interface provides straightforward communication with a display or application processor. Designers should account for backup-cell polarity and charging limits, route the supply return cleanly, and avoid treating a newly installed battery as proof that stored time is valid until the firmware performs its first synchronization.
推荐
Test and Measurement Instruments
The DS3231MZ/V+ can provide a stable time base for test and measurement instruments that record when samples were collected. A ±5 ppm clock helps align logs from multiple instruments and preserves calendar context after an interruption, while battery backup avoids resetting the timeline whenever the instrument's main supply is interrupted. The 8-SOIC package is practical for compact instrument electronics, and the 400 kHz I2C interface supports efficient host-controller communication. For laboratory-grade traceability, engineers should measure the complete system clock, reference the RTC to an external standard when required, and preserve a validity flag in exported data.
推荐
推荐产品汇总
工程参考数据： DS3231MZ/V+ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | DS3231M+ | DS3231MZ+ | DS3231SN#T&R | DS3232MZ+ | DS3234SN# |
|---|---|---|---|---|---|---|
| Package | 8-SOIC, 0.154 inch, 3.90 mm width | 8-pin NSOIC | 8-SOIC | 8-pin SOIC | 8-SOIC | 8-pin SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Device Type | Battery-backed I2C real-time clock and calendar | I2C real-time clock | I2C real-time clock | Real-time clock | Real-time clock | Real-time clock |
关键差异点
- Verified temperature-compensated timing accuracy （对比 DS3231M+)
- Documented 2.3 V to 5.5 V operating range （对比 DS3232MZ+)
- Fast two-wire serial interface （对比 DS3234SN#)
- Explicit package and compliance evidence （对比 DS3231SN#T&R)
设计说明
Decouple the DS3231MZ/V+ supply close to VCC with the capacitance specified by the complete manufacturer datasheet, and provide a low-impedance return path to ground. Because the device supports 2.3 V to 5.5 V operation, verify the backup-battery and VCC interaction rather than assuming that the primary rail can be removed without affecting timekeeping. Confirm polarity, charging behavior, and the effect of a depleted backup cell before releasing the design.
Place the RTC and its decoupling capacitor near the associated controller or power-supply area, and keep the I2C route away from high-current switching edges. Provide pull-up resistors on SDA and SCL with values selected from the bus voltage, capacitance, and the complete datasheet's sink-current limits. The verified package is an 8-SOIC with a 3.90 mm body width, so the PCB land pattern must be checked against the exact MZ package drawing rather than a generic narrow-SOIC footprint.
Do not assume that a powered RTC always contains a valid calendar after initial power-up, battery replacement, or a long outage. Firmware should detect an invalid clock state, set the time from a trusted source, and record synchronization events. Also verify whether the square-root-of-10 frequency register is needed and use only the calibration range documented by the manufacturer; no register-range values were supplied in the verified web data.
Use pull-up resistors that satisfy both the I2C rise-time requirement and the DS3231MZ/V+ sink-current limit for the actual bus voltage and total capacitance. Keep both traces short and connect their ground references continuously to reduce susceptibility to switching noise. Although the verified interface supports 400 kHz, reducing bus capacitance or using a lower speed can be appropriate when long point-to-point wiring or noisy industrial conditions make the nominal maximum impractical.
合规信息
RoHS compliance is explicitly identified in the verified DS3231MZ/V+ specification listing. The supplied data does not verify REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status; automotive qualification is not inferred.
