DS1307Z/T&R - 56B I2C RTC with NV SRAM | Analog Devices
MPN: DS1307Z/T&R ✓ AktifDS1307Z/T&R Ringkasan
A real-time clock, or RTC, is a low-power timing integrated circuit that preserves calendar and clock information while the main system is unpowered. Within the semiconductor hierarchy, the DS1307 is a real-time clock, a clock and timing IC, and ultimately a power-management IC for systems requiring timekeeping beyond the main processor's operational state. Its integrated nonvolatile SRAM allows a host controller to retain small amounts of configuration or diagnostic data alongside the calendar registers.
The DS1307 communicates through a bidirectional, two-wire serial bus identified in the manufacturer documentation as I2C. This interface minimizes pin count and allows the RTC to share SDA and SCL wiring with other compatible devices when address management and electrical pull-ups are handled correctly. Its BCD calendar representation and automatic month-end handling simplify date maintenance in embedded firmware. A square-wave output can provide a stable periodic reference without requiring the host to run continuously.
The 8-pin SOIC package is surface mount and is identified by distributor data as measuring 3.90 mm in width, corresponding to the common 0.154-inch narrow-SOIC outline. The available verified data identifies the Z suffix with an 8-SOIC package and the tape-and-reel ordering configuration. The product operates from a nominal 5 V supply, making it appropriate for legacy industrial, consumer, communications, and embedded systems that retain a 5 V I2C power domain.
Typical applications include industrial control panels, data loggers, metering equipment, communications equipment, embedded instruments, and products requiring persistent timestamps. The 56-byte nonvolatile SRAM is useful for configuration flags, counters, or small system records, while the real-time clock supplies a date and time source independent of the main microcontroller's reset state. The integrated square-wave output can support periodic task scheduling, sampling triggers, or external timing functions.
Designers should confirm the complete electrical limits, oscillator requirements, and recommended crystal and load-capacitor values against the manufacturer datasheet. The I2C bus requires suitable pull-up resistors and correct address selection when multiple peripherals share the same conductors. PCB placement should keep the RTC and its 32.768 kHz crystal network close together and away from high-current switching nodes to reduce timing noise and unintended clock coupling.
This page consolidates the verified manufacturer description, distributor pricing and inventory references, package information, comparison data, and practical implementation guidance. It also distinguishes verified drop-in options from related clocks that may require pinout and accuracy checks rather than assuming that every RTC with an I2C interface is interchangeable.
Pilihan pengganti yang segera untuk DS1307Z/T&R — sama paket, pin-pin kompatibel. Bahagian paket yang berbeza memerlukan kerja ulang PCB diasingkan.
Varietas dalam siri ini
Model serupa yang kompatibel dengan pengganti yang segera DS1307Z/T&R (sama faktor bentuk dan kaki) — berbeza dalam Package, Product Type, Interface, Package Width, Serial Interface.
DS1307Z+
✅ Masuk Drop-InHubungi untuk harga
Lihat Datasheet →DS1307ZN+T&R
✅ Masuk Drop-InHubungi untuk harga
Lihat Datasheet →DS1338Z-33+
✅ Masuk Drop-InHubungi untuk harga
Lihat Datasheet →DS1307Z/T&R Spesifikasi
| Product Type | Serial real-time clock and calendar |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Antaramuka | I2C bidirectional two-wire serial bus |
| Nonvolatile SRAM | 56 bytes |
| Calendar Representation | Full binary-coded decimal (BCD) |
| Time Fields | Seconds, minutes, and hours |
| Date Fields | Day, date, month, and year |
| Month-End Adjustment | Automatic for months with fewer than 31 days |
| Programmable Output | Square-wave output |
| Kemasan | 8-pin SOIC, 3.90 mm width |
| Package Width | 3.90 mm (0.154 inch) |
| Jenis Pemasangan | Surface mount |
| Shipping Format | Tape and reel |
| Total Memory | 64 x 8 bits |
| Time Format | 12-hour or 24-hour |
| Date Format | YY-MM-DD-dd |
Konfigurasi Pin DS1307Z/T&R
| Pin 1 | X1 — Crystal oscillator input |
| Pin 2 | X2 — Crystal oscillator output |
| Pin 3 | VCC — Power supply connection |
| Pin 4 | GND — Ground connection |
| Pin 5 | SDA — I2C serial data input and output |
| Pin 6 | SCL — I2C serial clock input |
| Pin 7 | SQW — Programmable square-wave output |
| Pin 8 | VCC — Power supply connection |
Aplikasi Biasa
DS1307Z/T&R patut untuk 6 aplikasis: Industrial Control Systems, Data Loggers and Environmental Monitors, Communications Equipment, Metering and Payment Terminals, Embedded Instruments and Test Equipment, Battery-Powered Field Systems.
Industrial Control Systems
The DS1307Z/T&R fits industrial control systems that need persistent timestamps for events, alarms, operating logs, and service records while the main controller is reset or power-cycled. Its 4.5 V to 5.5 V operating range supports established 5 V control electronics, while the I2C interface avoids dedicating multiple parallel pins on the controller. The 56-byte nonvolatile SRAM can retain compact configuration flags or counters, and automatic month-end handling reduces date-maintenance errors. Designers should verify the exact temperature grade and use the manufacturer oscillator and layout guidance when placing the device near power converters or high-current relays.
Disebarkan
Data Loggers and Environmental Monitors
The DS1307Z/T&R is useful in data loggers and environmental monitors because it maintains calendar information independently of the acquisition controller and provides 56 bytes of nonvolatile storage for compact metadata. A host processor can read the date and time over I2C and attach timestamps to sampled temperature, humidity, or equipment-condition data. The 8-SOIC package keeps the circuit compact, and the programmable square-wave output can trigger periodic sampling or interrupt the logger. Engineers should account for crystal accuracy, oscillator loading, and temperature effects when defining the required timestamp resolution over long unattended operating periods.
Disebarkan
Communications Equipment
The DS1307Z/T&R provides communications equipment with a compact, independent time source for event logs, protocol timing, configuration metadata, and service diagnostics. Its I2C interface allows the RTC to share a two-wire bus with suitable peripherals, reducing the host processor's pin burden, while the 56-byte SRAM can preserve a small amount of network or equipment state. The verified 4.5 V to 5.5 V supply range is appropriate for 5 V legacy and industrial communication platforms. Layout should separate the oscillator network from switching converters and high-speed digital returns to minimize coupling into the timekeeping path.
Disebarkan
Metering and Payment Terminals
The DS1307Z/T&R can supply transaction time and persistent auxiliary storage in metering and payment-terminal designs operating from a 5 V power domain. The BCD calendar registers simplify access to seconds, minutes, hours, day, date, month, and year, while automatic month-end correction avoids manual calendar updates. Its small 8-SOIC footprint and two-wire interface are advantageous where board area is constrained. Security-sensitive designs should treat the calendar as a time reference rather than a tamper-proof timestamp and should verify accuracy against the complete product timing requirement before implementation.
Disebarkan
Embedded Instruments and Test Equipment
The DS1307Z/T&R supports embedded instruments and test equipment that need to associate measurements and service events with calendar time. Its I2C bus permits firmware to read and write clock and calendar registers, while the 56-byte nonvolatile SRAM can hold calibration metadata, sequence identifiers, or limited configuration records. The square-wave output offers a periodic reference that can coordinate sampling or recurring actions without continuous timer activity from the main controller. For precision measurement equipment, verify oscillator tolerances, parasitic error, and long-term drift because the RTC is intended primarily for calendar and system timing rather than precision frequency metrology.
Disebarkan
Battery-Powered Field Systems
The DS1307Z/T&R can support calendar retention in battery-powered field systems where the main processor is powered down but event timing must survive. The low-power nature of a real-time clock allows a compact backup domain to maintain the calendar, while the 56 bytes of nonvolatile SRAM can hold limited recovery information. I2C connectivity lets a host controller read the time after wake-up and upload a delayed record. The system designer must preserve the oscillator supply path, account for backup-battery leakage and crystal behavior, and confirm that the device's operating environment satisfies its verified temperature grade.
Disebarkan
Ringkasan Produk Disebarkan
Data referensi kejuruteraan untuk DS1307Z/T&R — perbandingan, panduan rancangan, dan maklumat kesediaan
Panduan Pilihan
Perbandingan dengan Gantian
| Parametr | Produk Ini | DS1307Z+ | DS1307ZN+T&R | DS1338Z-33+ |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | SOIC-8 | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same |
| Interface | I2C two-wire serial | I2C two-wire serial | I2C two-wire serial | I2C real-time clock |
Penyeberangsung Jelas
- Combines a calendar RTC with 56 bytes of nonvolatile storage (vsDS1338Z-33+)
- Directly supports established 5 V systems (vsDS1338Z-33+)
- Maintains the established DS1307 function set (vsDS1307ZN+T&R)
Catatan Desain
Place the RTC and its crystal network close together and follow the manufacturer layout guidance exactly. Keep the oscillator traces short, route them away from switching nodes and high-current relay or converter paths, and minimize copper area beneath the crystal where practical. Parasitic capacitance and coupling can disturb oscillator amplitude and degrade timing accuracy, particularly when the RTC is separated from the host controller by long PCB routes.
The DS1307Z/T&R operates in the verified 4.5 V to 5.5 V range, so it cannot be connected directly to a 3.3 V I2C bus. Use a compatible 5 V supply domain or suitable level translation, and ensure pull-up voltages do not exceed the device limits. If battery-backed timekeeping is required, preserve the oscillator and supply path when the main supply is removed and validate leakage and current consumption in the complete system.
Do not assume that every I2C real-time clock is a drop-in replacement. Verify pin 1 orientation, SDA and SCL positions, both VCC connections, ground placement, oscillator loading, register addresses, and square-wave behavior before substituting another part. The DS1338Z-33+ shares the 8-SOIC format but has a different low-voltage identity, so its electrical compatibility and register map must be checked against the existing design.
Maklumat Kesediaan
The verified snippets identify DS1307 family members as RoHS-related comparison data, but they do not provide definitive compliance statements for the DS1307Z/T&R. Compliance values are therefore left unknown rather than inferred.