DS1302N+

DS1302N+ is an RTC (real-time clock) IC from Dallas/Maxim with a 32.768 kHz timebase, battery-backed RAM, and a simple 3‑wire interface (CE, CLK, I/O). It keeps time and date (seconds–year), supports 12/24h modes and leap years, and provides 31 bytes of battery-backed RAM for data logging. It includes a trickle‑charger path to power a backup battery (VBAT) when main power is off. Communication uses a register‑oriented protocol: send an address byte (indicating read/write and target register) followed by data. It operates from 2.0–5.5 V and can run off main supply with VBAT backup. Ideal for timestamping events or maintaining time during power outages; requires a 32 kHz crystal or oscillator input for accurate timekeeping. Not I2C/SPI-based; uses a simple CE/CLK/I/O interface.

DS1302N+ is Maxim’s 3-wire RTC with battery backup; there isn’t an exact pin‑for‑pin substitute. Practical equivalents/alternatives:
- DS1302/DS1302N (same family)
- DS1307 (I2C, older)
- DS3231 (I2C, high accuracy)
- MCP7940N (Microchip, I2C with NV RAM)
- PCF8563 (NXP, I2C)
- RV-3028-C2 (Micro Crystal, I2C)
Note: DS1302N+ uses a 3-wire interface, so migration may require interface changes.

DS1302N+ is a low-power real-time clock with calendar and backup features. Key points:
- Real-time clock/calendar: tracks seconds, minutes, hours, day, date, month, year (leap-year aware).
- 32.768 kHz crystal oscillator input for accurate timekeeping.
- 31-byte general-purpose RAM for data storage.
- 3-wire serial interface (CE, CLK, IO): SPI-like, not I2C.
- Battery backup with VBAT and automatic power-fail switch to maintain time when VCC is removed.
- Trickle-charge capability to charge a back-up battery from VCC via external resistors/diodes.
- Programmable SQW/OUT square-wave output (interrupt/time signal) on the SQW/OUT pin.
- Small package options and low power consumption in battery mode.
Ideal for embedded systems needing persistent timekeeping, data RAM, and a backup path without external timing loss.

- Pin count: 8 pins (8-pin package).
- Function: Serial Real-Time Clock (RTC). Uses a 3‑wire interface (CE, SCLK, I/O) to read/write time/calendar and control registers. Requires a 32.768 kHz crystal on X1/X2 and has a VBAT backup pin to maintain time when VCC is absent, with an optional trickle-charge circuit for the backup battery.

Manufacturer: Dallas Semiconductor. The company is now part of Maxim Integrated, which itself is a subsidiary of Analog Devices.
What kind of company: A semiconductor company that designs and manufactures integrated circuits and electronic components (e.g., RTCs, memory, 1‑Wire devices).

DS1302N+ is a battery-backed real-time clock with a 3-wire serial interface (CE, IO, SCLK) for timekeeping and calendar support. Suitable for:
- Time stamping and logging in data loggers and sensor networks
- Scheduling, alarms, and wake-up control in embedded systems
- Digital clocks and timekeeping in consumer electronics
- Industrial automation and process control with accurate time records
- Battery-powered handheld devices, wearables, POS terminals, and remote monitoring
Keeps accurate time during power loss and supports leap-year calendars; interface is not I2C.

DS1302N+ is an 8-pin RTC. The N suffix denotes DIP-8 (through-hole) packaging; it’s also available in surface-mount 8-pin packages (SO-8/SOP-8) from some suppliers.