DS1307ZN+T&R - I2C RTC with 56B SRAM | Analog Devices
料号： DS1307ZN+T&R ✓ 量产中DS1307ZN+T&R 概述
A real-time clock is a timekeeping integrated circuit that preserves calendar information when the main system is unpowered. The broader hierarchy is RTC -> serial clock/calendar -> timing IC -> semiconductor. Unlike a microcontroller software timer, the DS1307ZN+T&R continues tracking time independently, making it useful for data logging, industrial controllers, embedded products, and systems that require timestamps after reset or power interruption.
The principal feature is the combination of BCD clock/calendar data and 56 bytes of NV SRAM in one compact device. The calendar automatically adjusts the end-of-month date for months with fewer than 31 days. The I2C interface reduces the number of host connections compared with a parallel real-time clock, while the 8-pin SOIC package supports conventional surface-mount manufacturing. The verified distributor description identifies the interface as 2-wire serial I2C and the memory as 56 bytes.
The DS1307 uses a serial architecture in which address and calendar data are transferred over the same two-wire bus. Host firmware writes control and calendar registers or reads the current time, while the SRAM provides compact nonvolatile storage for alarms, counters, configuration data, or small log fragments. Its low-power design makes it appropriate for embedded systems in which the host is frequently powered down but wall-clock continuity remains valuable.
Typical implementations include industrial data loggers, building-control equipment, consumer appliances, metering systems, and microcontroller-based embedded products. In each case, the RTC acts as the authoritative low-power time source while the host handles calculations, communications, user interaction, and higher-level control. The integrated SRAM can retain small configuration records without adding a separate external memory component.
PCB design should preserve the exact 8-pin SOIC footprint and route the I2C lines as a properly terminated bus. The verified source set does not provide detailed pin names, crystal configuration, capacitor values, or electrical limits, so those design details must be confirmed in the current Analog Devices or Maxim Integrated manufacturer datasheet before layout and firmware are released.
This page consolidates the verified manufacturer description, distributor records, package information, functional alternatives, and application guidance. It also distinguishes verified capabilities from parameters that still require datasheet confirmation, helping engineers evaluate the DS1307ZN+T&R without assuming unsupported electrical specifications.
直接替换替代料： DS1307ZN+T&R ——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+T&R （相同外形与封装尺寸） ——差异在于 Package, Product Type, Mounting Type, End-of-Month Adjustment, Interface.
DS1307ZN+
✅ 直接替换联系询价
查看数据手册 →DS1307Z+
✅ 直接替换联系询价
查看数据手册 →DS1307Z+T&R
✅ 直接替换📋 参考替代料（不在目录中）
DS1307N
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →DS1307ZN+T&R 规格参数
| Product Type | Serial real-time clock and calendar with NV SRAM |
| Clock Calendar Data Format | Binary-coded decimal (BCD) |
| Serial Interface | I2C, bidirectional 2-wire serial |
| NV SRAM Capacity | 56 bytes |
| Calendar Resolution | Seconds through year |
| Maximum Supply Voltage | 5.5 V |
| 封装 | 8-pin SOIC, 0.154 inch body width, 3.90 mm width |
| 安装类型 | Surface mount |
| Shipping Format | Tape and reel |
DS1307ZN+T&R 8-pin soic, 0.154 inch body width, 3.90 mm width 引脚配置指南
DS1307ZN+T&R（8-pin soic, 0.154 inch body width, 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： DS1307ZN+T&R.
请参阅 数据手册 以查看完整引脚配置。
典型应用
DS1307ZN+T&R 适用于 6 应用s: Industrial Data Loggers, Building Control Systems, Metering and Energy Equipment, Consumer Appliance Control, Embedded Product Timestamping, Battery-Backed Portable Equipment.
Industrial Data Loggers
The DS1307ZN+T&R fits industrial data loggers that must retain calendar time when the main controller is reset or powered down. Its I2C interface lets an embedded MCU read seconds through year without consuming many general-purpose I/O pins, while the 56-byte NV SRAM can hold counters, sample flags, or small configuration records. The BCD clock/calendar also automatically corrects month length, avoiding recurring firmware corrections for shorter months. Because the verified sources confirm the 56-byte memory, I2C architecture, and 8-pin SOIC package, the part is well suited to compact control boards. Before deployment, verify the required temperature grade, backup-battery current, oscillator accuracy, and electromagnetic requirements in the manufacturer datasheet.
推荐
Building Control Systems
DS1307ZN+T&R is useful in building-control equipment that needs a reliable local timestamp for occupancy, heating, ventilation, or access-control events. A host processor can read the maintained calendar through the bidirectional I2C bus and use the 56-byte SRAM for operating schedules, counters, or recently changed configuration values. The 8-pin SOIC package limits board area, and automatic end-of-month adjustment simplifies long-duration operation across February and 30-day months. In multi-board installations, the RTC should be paired with proper I2C pull-ups, a validated backup source, and firmware that detects unexpected time discontinuities. The exact temperature range and long-term accuracy must be confirmed for the controlled environment.
推荐
Metering and Energy Equipment
The DS1307ZN+T&R can support metering equipment where measurement records must be associated with a real calendar timestamp. Its seconds-to-year BCD calendar provides sufficient resolution for event logs, while the integrated 56-byte NV SRAM preserves compact counters or calibration flags even when the metering MCU is reset. The two-wire serial interface allows the RTC to coexist with other addressable devices on a shared I2C bus, although address and pull-up details must be checked against the current datasheet. Compared with deriving time from the host oscillator, the dedicated RTC separates elapsed-time tracking from general processor timing. For utility-class equipment, engineers should additionally validate calibration, temperature effects, backup endurance, and any regulatory metrology requirements.
推荐
Consumer Appliance Control
DS1307ZN+T&R is appropriate for appliances and embedded consumer products that need real time across a mains interruption or controller reset. A microwave, refrigeration controller, or programmable appliance can read the date and time over I2C for delayed-start programs, cleaning cycles, or event logs. The 56-byte NV SRAM provides a small persistent area without requiring a separate serial memory, and the 8-pin SOIC package is straightforward for automated surface-mount assembly. Software should treat the RTC value as potentially invalid after a complete backup-power loss and should set a confidence flag rather than assume calendar continuity. The designer must confirm startup behavior, oscillator accuracy, and operating-temperature limits for the specific appliance enclosure.
推荐
Embedded Product Timestamping
DS1307ZN+T&R gives embedded products a dedicated time source for event ordering, diagnostic records, and communication timestamps. The I2C bus carries both address and data, so the MCU requires only SDA and SCL connections rather than a parallel RTC interface. The BCD calendar maintains day, date, month, and year information, while its automatic short-month correction reduces software maintenance. The 56-byte SRAM is useful for a transaction sequence number, boot counter, or compact configuration block, although it is too small for general event logging. Firmware should include a validity marker, detect implausible dates, and define a recovery policy for battery exhaustion. Crystal layout and backup-network component selection must follow the authoritative manufacturer guidance.
推荐
Battery-Backed Portable Equipment
DS1307ZN+T&R can support battery-backed portable equipment that requires calendar continuity across short or extended power interruptions. Its dedicated RTC remains distinct from the main MCU's power state, while the 56-byte NV SRAM provides a compact place to store configuration fragments or a shutdown reason. The low-power serial architecture is suitable for space-constrained portable products, and the 8-pin SOIC footprint permits compact board placement. Engineering teams should estimate backup-cell life from the manufacturer-specified backup current, size the primary rail for startup peaks, and prevent battery-backup leakage from corrupting the host supply. Because the supplied records do not state backup current or accuracy, those values must be obtained from the current datasheet before making a battery-life claim.
推荐
推荐产品汇总
工程参考数据： DS1307ZN+T&R ——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 | DS1307ZN+ | DS1307Z+ | DS1307Z+T&R | DS1307 |
|---|---|---|---|---|---|
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Product Function | Serial BCD real-time clock and calendar | DS1307-family serial RTC | DS1307-family serial RTC | DS1307-family serial RTC | Serial real-time clock |
| NV SRAM Capacity | 56 bytes | 56 bytes | 56 bytes | 56 bytes | 56 bytes |
| Serial Interface | I2C, bidirectional 2-wire serial | I2C, 2-wire serial | I2C, 2-wire serial | I2C, 2-wire serial | I2C, 2-wire serial |
| Calendar and Date Handling | Seconds through year with automatic short-month adjustment | DS1307 calendar; comparison source reports a date-format difference | DS1307-family calendar | DS1307-family calendar | Seconds through year with automatic short-month adjustment |
关键差异点
- Clock/calendar and persistent memory in one device （对比 DS1307ZN+)
- Direct I2C host connectivity （对比 DS1307Z+)
- Compact surface-mount integration （对比 DS1307)
- Automatic correction for shorter months （对比 DS1307Z+T&R)
设计说明
Allocate the DS1307ZN+T&R footprint for the 8-pin SOIC package and confirm body width, lead geometry, and pin numbering against the current manufacturer drawing. Place the RTC and its oscillator network close to the associated ground and supply connections, with the shortest practical return path. Because the supplied data confirms an 8-SOIC package but does not include the complete pin table, the PCB schematic and layout must not be released from a third-party pinout image without cross-checking the manufacturer datasheet.
Design the supply and backup paths from verified electrical limits rather than assuming that any DS1307 suffix is interchangeable. Confirm the operating supply range, active current, backup-battery current, and startup behavior in the manufacturer datasheet. Add local supply bypassing and ensure that backup-cell leakage cannot back-feed the main rail. Firmware should also detect implausible calendar values after full power loss so that a depleted backup source does not silently corrupt event timestamps.
Treat the I2C SDA and SCL connections as a shared bus and apply pull-up resistors only after checking the bus voltage, capacitance, and number of attached devices. Keep routing away from switching nodes and high-current edges, and use a topology that minimizes stubs on the RTC branch. The verified sources confirm the bidirectional two-wire interface but do not state the slave address or recommended rise-time values, so those details must be obtained from the current Analog Devices documentation.
合规信息
The supplied manufacturer and distributor snippets do not provide verified RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. A cross-reference search mentions RoHS details, but the underlying declaration was not included, so no compliance conclusion is asserted.
