DS1307ZN+ - 56B I2C RTC with SRAM | Maxim Integrated
料号： DS1307ZN+ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.39 | $2.39 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
DS1307ZN+ 概述
A real-time clock is a semiconductor timing component that maintains calendar information independently of the host processor. In the system hierarchy, an RTC belongs to clock and timing integrated circuits, alongside oscillators, timers, and frequency-control devices. The DS1307 records seconds, minutes, hours, day, date, month, and year while also exposing 56 bytes of battery-backed storage for alarms, configuration, or application data.
Principal verified features include serial I2C address and data transfer, a 64 × 8 register map, 56 bytes of nonvolatile SRAM, and automatic end-of-month adjustment for months with fewer than 31 days. The manufacturer describes it as a full BCD clock/calendar. The integrated SRAM distinguishes it from RTCs that provide only calendar registers, while the serial interface allows a host microcontroller or processor to read and update time without using many parallel pins.
The device combines timekeeping and small amounts of persistent configuration storage in one compact IC. Its clock/calendar registers expose standard time information, while SRAM bytes can retain settings when the system loses its main supply, provided the RTC backup supply remains available. Exact electrical limits, oscillator accuracy, voltage range, current consumption, alarm behavior, and square-wave timing require confirmation from the complete manufacturer datasheet.
Typical uses include industrial controllers, embedded data loggers, building equipment, access-control terminals, connected sensors, and legacy computer systems that retain an I2C host interface. A microcontroller reads the BCD calendar through the serial bus and can use the SRAM for small configuration records. Firmware must convert BCD values into binary or decimal and detect month rollover at the end of shorter months.
Designers should confirm the backup-battery implementation, logic levels, address selection, pull-up arrangement, and decoupling against the manufacturer datasheet before layout release. The I2C bus requires suitable pull-ups, while the 8-SOIC footprint requires a land pattern matching the 3.90 mm-wide body. Do not infer oscillator accuracy or retention duration from the RTC category; those values must be verified for the selected production variant.
This page consolidates the official DS1307 description, distributor package information, verified sourcing links, and engineering selection guidance. It also separates confirmed facts from parameters requiring verification, helping engineers evaluate the DS1307ZN+ without confusing a functionally similar RTC with a guaranteed pin-to-pin replacement.
直接替换替代料： DS1307ZN+ ——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： DS1307ZN+ （相同外形与封装尺寸） ——差异在于 End-of-Month Adjustment, Package, Product Type, Register Organization.
快速对比工具——选择替代料号进行并排对比：
DS1307Z+
✅ 直接替换✓ 有现货
联系询价
查看数据手册 →DS1307ZN+ 规格参数
| Product Type | Serial real-time clock and nonvolatile SRAM |
| Clock/Calendar Format | Full binary-coded decimal (BCD) |
| Time Fields | Seconds, minutes, hours, day, date, month, and year |
| Serial Interface | I2C, 2-wire bidirectional serial bus |
| Register Organization | 64 × 8 bits |
| Nonvolatile SRAM | 56 bytes |
| End-of-Month Adjustment | Automatic adjustment for months with fewer than 31 days |
| 封装 | 8-SOIC, 0.154 inch (3.90 mm) width |
| 引脚数量 | 8 pins |
| 安装类型 | Surface mount |
DS1307ZN+ 引脚配置
| 引脚 1 | X1 — Crystal oscillator input |
| 引脚 2 | X2 — Crystal oscillator output |
| 引脚 3 | SCL — Serial clock input for the I2C interface |
| 引脚 4 | SDA — Serial data input and output for the I2C interface |
| 引脚 5 | GND — Ground connection |
| 引脚 6 | VCC — Primary supply connection |
| 引脚 7 | SQW/OUT — Square-wave or output pin; multifunction details require the manufacturer datasheet |
| 引脚 8 | VBACKUP — Backup supply connection |
典型应用
DS1307ZN+ 适用于 6 应用s: Industrial Data Logger, Building Equipment Controller, Access-Control Terminal, Connected Environmental Sensor Hub, Medical Cart Event Tracking, Embedded Security Appliance.
Industrial Data Logger
The DS1307ZN+ fits data loggers that must retain timestamps even when the main supply is interrupted. Its confirmed calendar registers cover seconds through year, while 56 bytes of nonvolatile SRAM can hold limited configuration or event metadata. An embedded controller reads BCD values over the two-wire I2C interface and converts them before storage. The design must verify voltage, temperature, accuracy, and backup-source limits from the complete manufacturer datasheet.
推荐
Building Equipment Controller
DS1307ZN+ can provide calendar-aware scheduling and persistent operating parameters in building-control equipment. Its 56-byte NV SRAM is useful for retaining small configuration blocks, while the BCD calendar supplies date and time information to the controller. The device connects through I2C rather than consuming a parallel bus, helping preserve host pins. Qualification for a specific building-control design still requires checking temperature range, EMC needs, and calendar accuracy.
推荐
Access-Control Terminal
The DS1307ZN+ supports access-control systems that need audit timestamps and a small amount of persistent transaction metadata. Its RTC calendar can timestamp records, while 56 bytes of nonvolatile SRAM can retain terminal identifiers, counters, or configuration fragments when mains power fails. Firmware should use disciplined BCD decoding and validate rollover behavior. Battery selection and retention time must be engineered from verified device current and lifetime characteristics rather than assumed.
推荐
Connected Environmental Sensor Hub
DS1307ZN+ can timestamp measurements and retain limited calibration or commissioning data in an environmental sensor hub. The sensor controller uses I2C to read BCD calendar registers and write selected settings into the 56-byte NV SRAM. This is useful when the hub must retain operating information during brief power interruptions. Engineers should verify clock accuracy across the expected temperature span and confirm whether the system requires higher precision than the RTC provides.
推荐
Medical Cart Event Tracking
DS1307ZN+ may support real-time event tracking in a medical cart or diagnostic accessory when timestamps and compact persistent records are required. The 56-byte NV SRAM can hold a limited device identifier or operating-state record, and the calendar can correlate events with a host controller. This application does not by itself establish medical certification; compliance must be assessed for the finished system. Electrical isolation, safety, accuracy, and temperature requirements must be verified independently.
推荐
Embedded Security Appliance
DS1307ZN+ is appropriate for a small security controller that needs nonvolatile calendar time and limited local storage. Event logs can be timestamped over I2C, while the SRAM can preserve compact counters or boot parameters when primary power is removed. Firmware should treat the RTC as one time source among several and handle invalid backup-power conditions. For network-connected appliances, security requirements may favor an RTC with stronger accuracy, alarm, or tamper-detection features.
推荐
推荐产品汇总
工程参考数据： DS1307ZN+ ——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 | DS1307Z+ |
|---|---|---|
| Package | 8-SOIC (0.154 inch, 3.90 mm Width) | 8-SOIC family compatibility reported; exact package dimensions require verification |
| Brand | Maxim Integrated | Maxim Integrated |
| Product Type | Serial real-time clock with NV SRAM | DS1307-family serial real-time clock |
| Register Organization | 64 × 8 bits | 64 × 8 bits |
| Nonvolatile SRAM | 56 bytes | 56 bytes |
| Serial Interface | I2C, 2-wire bidirectional | I2C, 2-wire bidirectional |
| Calendar Format | Full BCD | Full BCD |
| Calendar Fields | Seconds, minutes, hours, day, date, month, and year | Seconds, minutes, hours, day, date, month, and year |
| End-of-Month Handling | Automatic for months with fewer than 31 days | Automatic for months with fewer than 31 days |
关键差异点
- Clock/calendar and persistent storage in one package （对比 DS1307Z+)
- Established serial architecture （对比 PCF8523)
- Compact BCD calendar implementation （对比 DS1820)
设计说明
Place the DS1307ZN+ close to the host’s I2C controller and route SDA and SCL away from switching-node and high-current paths. The verified data confirms a two-wire serial interface but does not provide a recommended trace length or rise-time budget. Use the manufacturer’s electrical characteristics to select pull-up values after accounting for bus capacitance, voltage level, leakage, and the host controller’s output characteristics.
Design the VCC and VBACKUP paths from verified current and voltage limits before choosing resistors, capacitors, or a backup cell. The supplied sources confirm that the device includes nonvolatile SRAM, but they do not quantify backup current or retention duration. Measure worst-case system behavior with the main supply present, absent, and transitioning, and avoid assuming that short current measurements predict long-term retention.
Do not treat every similarly described RTC as a drop-in substitute. PCF8523, DS1820, and DS1338 appear in a general DS1307 alternatives article, but different addresses, voltage ranges, packages, alarms, or registers can prevent direct replacement. Verify pin mapping, supply limits, I2C address, register layout, calendar behavior, and existing firmware compatibility against the original and candidate datasheets.
Keep the oscillator circuit and its ground return compact and isolated from noisy digital and power-conversion routes. Crystal component values, load capacitance, ESR limits, and layout guidance are not present in the supplied excerpts, so they must come from the full official DS1307 datasheet. Do not substitute crystal or load-capacitor values based only on the device’s timekeeping function.
合规信息
The supplied search results do not contain verified RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements. AEC-Q100 is marked not applicable because no automotive qualification is stated and this is a general-purpose clock/calendar rather than an automotive-qualified claim.
