DS1307+ - I2C RTC with 56B SRAM | Maxim Integrated
N.º de pieza: DS1307+ ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $2.39 | $2,39 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1.000 | $0 | $0,00 |
DS1307+ Descripción general
A real-time clock is a dedicated timekeeping integrated circuit that continues tracking wall-clock time independently of a microcontroller’s main program. The DS1307+ belongs to the RTC and clock/calendar category, within broader timing and embedded semiconductor systems. Its internal registers provide seconds, minutes, hours, calendar fields, and control/status information, while the SRAM provides 56 bytes for general nonvolatile data such as configuration values, counters, or small status records.
The principal features include a 64 x 8 register space, BCD clock and calendar data, automatic end-of-month adjustment, I2C serial access, and a two-wire interface. Address and data are transferred serially over the same bus, allowing a host microcontroller to initialize the oscillator, read the current time, write new time values, and access the SRAM. The verified manufacturer page identifies the DS1307 as a production part and lists a starting list price of $2.39, while LCSC reports DS1307+ pricing from $2.9452.
The DS1307+ uses an external 32.768 kHz crystal as its timebase. Crystal selection and layout strongly influence accuracy, so the oscillator should be placed close to the device and surrounded by a quiet ground return. The I2C bus requires pull-up resistors, and the device’s 5V-only supply requirement should be checked against the host system before substitution. The 8-DIP package is suitable for through-hole prototype boards, but a surface-mount variant would be preferable in compact production designs when pin compatibility is not required.
Typical uses include microcontroller data loggers, industrial controllers, embedded instrumentation, access-control systems, and products requiring calendar timestamps after power loss. The I2C interface also makes the DS1307+ convenient for systems already using PCF8574, PCA9557, STM32, MSP430, or similar embedded controllers. Its SRAM can retain small operating parameters without using the MCU’s nonvolatile memory.
When designing around the DS1307+, verify the complete pinout, crystal connection, supply decoupling, I2C pull-up arrangement, and battery-backed supply architecture before layout release. Firmware must also use the correct device address and BCD register format. For designs where higher time accuracy or a smaller surface-mount footprint is required, a temperature-compensated RTC may be a better architectural choice.
This page combines verified manufacturer information, distributor availability, package details, application guidance, and honest replacement analysis. It also distinguishes true drop-in interchangeability from functional alternatives that may require firmware, PCB, or crystal changes.
Alternativas directas para DS1307+ — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con DS1307+ (mismo factor de forma y huella) — difiere en Package, Mounting Type, Function, MSL Level, RoHS Status.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
DS1307N
✅ Sustitución directa✓ En stock
$1.29 / unidad
Ver hoja de datos →DS1307N
✅ Sustitución directa✓ En stock
$1.29 / unidad
Ver hoja de datos →DS1307+ Especificaciones
| Device Type | Serial real-time clock with nonvolatile SRAM |
| Register Organization | 64 x 8 |
| Clock/Calendar Data | Full BCD seconds, minutes, hours, day, date, month, and year |
| Nonvolatile SRAM | 56 bytes |
| Serial Interface | I2C, 2-wire, bidirectional |
| Tensión de alimentación | 5 V |
| External Timebase | 32.768 kHz crystal |
| End-of-Month Adjustment | Automatic |
| Encapsulado | 8-DIP (0.300 inch, 7.62 mm) |
| Tipo de montaje | Through-hole |
| I2C Address | 0x68 |
| Data Format | Binary-coded decimal (BCD) |
| Estado RoHS | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | unknown |
Configuración de pines de DS1307+
| Pin 1 | [DATA_NEEDED: pin 1 name] — [DATA_NEEDED: pin 1 function] |
| Pin 2 | [DATA_NEEDED: pin 2 name] — [DATA_NEEDED: pin 2 function] |
| Pin 3 | [DATA_NEEDED: pin 3 name] — [DATA_NEEDED: pin 3 function] |
| Pin 4 | [DATA_NEEDED: pin 4 name] — [DATA_NEEDED: pin 4 function] |
| Pin 5 | [DATA_NEEDED: pin 5 name] — [DATA_NEEDED: pin 5 function] |
| Pin 6 | [DATA_NEEDED: pin 6 name] — [DATA_NEEDED: pin 6 function] |
| Pin 7 | [DATA_NEEDED: pin 7 name] — [DATA_NEEDED: pin 7 function] |
| Pin 8 | [DATA_NEEDED: pin 8 name] — [DATA_NEEDED: pin 8 function] |
Aplicaciones típicas
DS1307+ es adecuado para 6 aplicacións: Microcontroller Data Logger, Embedded Instrumentation, Industrial Access-Control System, Battery-Backed Controller, Scheduled Automation Controller, Prototype Embedded Timekeeping Board.
Microcontroller Data Logger
The DS1307+ fits a microcontroller data logger that must attach timestamps to records during normal operation and preserve time information after a power interruption. Its I2C two-wire interface allows an STM32, MSP430, or other embedded controller to read calendar registers without dedicating multiple parallel pins. The device stores seconds through year in BCD format and adds 56 bytes of nonvolatile SRAM for a small configuration block. A 5 V supply, external 32.768 kHz crystal, and appropriate bus pull-ups are required. The design should validate rollover behavior at month and year boundaries.
Recomendado
Embedded Instrumentation
DS1307+ is useful in measurement equipment that records the date and time of calibration events, service intervals, or operating logs. The RTC’s separate timekeeping function lets the instrument retain wall-clock information even when the main controller is reset or power is briefly interrupted. Its 56-byte SRAM can hold a compact instrument identifier or operating-state record alongside the calendar. Because DS1307+ is a 5 V through-hole DIP device, it is particularly convenient on prototype and laboratory boards where rework and socket replacement are acceptable.
Recomendado
Industrial Access-Control System
The DS1307+ can provide timestamp context in an access-control terminal where event records must remain associated with a real date and time. An I2C host controller can read the calendar over the two-wire bus while the SRAM preserves small configuration or audit-related state. The device’s low-power serial architecture is appropriate for embedded systems that spend substantial time between external communications. Designers should account for the 5 V supply requirement, crystal start-up behavior, decoupling, and protection of the external timebase from vibration or temperature variation.
Recomendado
Battery-Backed Controller
DS1307+ is appropriate for a battery-backed controller that must resume operations with a valid calendar after power restoration. The RTC’s calendar registers remain separate from the main application state, while its 56-byte SRAM offers a small amount of nonvolatile storage for values that must survive power loss. The implementation should preserve the RTC supply path during main-power shutdown and ensure that the external crystal is mounted close to the device with a clean ground reference. Exact backup current and battery-life figures are not included in the verified excerpt.
Recomendado
Scheduled Automation Controller
The DS1307+ can support scheduled automation by providing a host controller with calendar and clock data independent of software timers. A microcontroller can compare stored event times with the RTC registers and trigger relays, logging stages, alarms, or maintenance intervals. The I2C interface simplifies connection to existing embedded boards, and the BCD calendar format is directly accessible through standard register reads. For industrial deployment, validate oscillator tolerance, reset behavior, leap-year handling, and the complete operating-temperature range against the full manufacturer data sheet rather than relying only on distributor summaries.
Recomendado
Prototype Embedded Timekeeping Board
DS1307+ is a straightforward choice for prototype boards and educational embedded systems because it uses a conventional 8-DIP package and an I2C interface. The through-hole format is easy to socket, inspect, and replace during development, while the external crystal makes the timebase behavior explicit in the schematic. It can be paired with a microcontroller development board to demonstrate calendar reads, alarm or control scheduling, and nonvolatile storage. For production miniaturization, verify whether the same design can migrate to a surface-mount RTC or whether a PCB change is required.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para DS1307+ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | DS1307 | DS1307N |
|---|---|---|---|
| Product Type | Serial real-time clock with 56-byte nonvolatile SRAM | Serial real-time clock with nonvolatile SRAM | DS1307 family RTC variant |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Verified Drop-In Status | Target part | Same family and package; variant compatibility should still be confirmed | Same family candidate; exact electrical suffix comparison unavailable |
Diferenciadores clave
- Integrated calendar and general-purpose nonvolatile storage (frente a DS1307)
- Simple 8-DIP implementation for through-hole designs (frente a DS1307N)
- Widely documented I2C register-oriented architecture (frente a MCP7940N)
Notas de diseño
Design the power path for both normal operation and backup retention. The verified source identifies DS1307+ as a 5 V device, so the host system must provide the required supply level and adequate decoupling near the DIP pins. If the RTC is intended to retain time during main-power removal, provide the manufacturer-recommended backup supply arrangement and verify leakage against the required standby current. Do not infer 3.3 V compatibility without checking the full electrical limits.
Place the DS1307+ crystal as close as practical to the oscillator pins and provide a quiet, uninterrupted ground return. Keep the crystal traces short and avoid routing high-current switching nodes beneath or adjacent to the timebase network. Add local supply bypass capacitors and route the I2C pull-ups to the correct logic rail. A ground plane that remains continuous around the RTC is generally preferable to a fragmented return path.
Do not treat every DS1307-family listing as automatically identical. Confirm the exact MPN suffix, package, supply limits, register behavior, and temperature grade against the manufacturer data sheet before substituting a part. Firmware must also account for BCD encoding, I2C addressing, and calendar rollover. Migration alternatives such as MCP7940N or DS3231 may use a different footprint, address, crystal arrangement, or register map and therefore require a deliberate design review.
For a prototype board, use the 8-DIP footprint and provide clear silkscreen labels for VCC, GND, SDA, SCL, and the crystal connections. Before releasing a production PCB, obtain the official pin description and compare it line by line with the chosen schematic symbol. Do not copy an unverified third-party pinout. Keep connector access available for an external backup battery or supply-disconnect test, and reserve debugging access for I2C timing and oscillator-startup checks.
Información de cumplimiento
The supplied verified data does not include compliance declarations for RoHS, REACH, AEC-Q100, lead-free status, halogen-free status, or conflict-minerals compliance. No assumption should be made based only on the manufacturer brand or package.
