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DS1302S+

Name: DS1302S+
Rating: 4.7 (12 reviews)

IC RTC CLK/CALENDAR SER 8-SOIC

メーカー
Mfr。パート #DS1302S+
パッケージ SOP8
データシート
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仕様

Package	Tape & Reel (TR),Cut Tape (CT)
ProductStatus	Active
Type	Clock/Calendar
Features	Alarm, Leap Year
TimeFormat	HH:MM:SS (12/24 hr)
DateFormat	YY-MM-DD-dd
Interface	I²C, 2-Wire Serial
Voltage-Supply	1.3V ~ 5.5V
Current-Timekeeping(Max)	14µA ~ 30µA @ 3V ~ 5V
OperatingTemperature	-40°C ~ 85°C
MountingType	Surface Mount
Package/Case	8-SMD, Flat Lead
MemorySize	1B
Voltage-SupplyBattery	1.6V ~ 3.6V
Series	Automotive, AEC-Q200

概要

Description

DS1302S+ is a compact real-time clock (RTC) IC (variant of Maxim/Dallas DS1302). It keeps time when powered from Vcc or a backup battery via VBAT, making it ideal for battery-backed clocks and data-loggers. It uses a three-wire serial interface (CE, CLK, IO) for reading/writing registers and a 32 kHz oscillator input for timekeeping. It provides time/date registers (seconds, minutes, hours, date, day, month, year), supports 24/12-hour mode, and handles leap years (typically year 00–99). It also includes 31 bytes of battery-backed RAM for data storage and a trickle-charge circuit to recharge the backup battery. The DS1302S+ is a low-power, inexpensive RTC you can interface with microcontrollers via simple bit-banging or SPI-like code. Suitable for embedded projects requiring persistent timekeeping without continuous main power.

Features

Key features of DS1302S+ RTC:
- Real-time clock with full calendar: seconds, minutes, hours (12/24 h), day, date, month, year; leap-year aware; 100-year calendar.
- 31 bytes of general-purpose RAM accessible via the same 3-wire serial interface.
- 3-wire interface (CE, CLK, IO) with burst read/write capability (SPI-like, not I2C).
- Battery backup support with automatic switchover; built-in trickle-charge circuit to keep/charge the backup battery.
- Programmable square-wave output on SQW/INT pin: selectable frequencies of 1 Hz, 1/2 Hz, 1/4 Hz, 1/8 Hz, or disabled.
- External 32.768 kHz crystal for timebase.
- Low power consumption; maintains timekeeping in battery mode.
- Wide operating voltage: typically 2.0–5.5 V (with VBAT backup support).
- Available in standard 8-pin packages (DIP/SOIC).
Note: DS1302S+ is functionally similar to DS1302; exact pinouts and options may vary by supplier.

Package

DS1302S+ is an 8-pin device, available in DIP-8 (through-hole) and SOIC-8 (surface-mount) packages; Pb-free options available.

Pinout

DS1302S+ is an 8-pin real-time clock (RTC) with a 3-wire serial interface.
Pin count: 8 pins (DIP-8/SO-8).
Pin functions:
- VCC: main supply
- GND: ground
- VBAT: battery-backup supply
- CE: Chip Enable for the 3-wire serial interface
- SCLK: Serial Clock
- IO: bidirectional data line
- X1 and X2: connections to the external 32.768 kHz crystal (oscillator)
Notes: Timekeeping is via the crystal connected to X1/X2; data transfer uses CE, SCLK, and IO; VBAT/ VCC allows battery-backed operation.

Manufacturer

- Manufacturer: Dallas Semiconductor (historically; the DS1302S+ is a Dallas/Maxim part; Maxim Integrated later acquired Dallas, and Maxim is now part of Analog Devices).
- What kind of company: A U.S. semiconductor company that designs and manufactures integrated circuits ( ICs ), including real-time clocks.

Application

Applications:
- Real-time clock/calendar for microcontroller systems
- Time stamping and data logging (sensors, events)
- Alarm/timer and wake-up control for automation and power-saving
- Battery-backed RAM for non-volatile data during power loss
- Digital clocks, appliances, instrumentation, wearables
- Any embedded system needing reliable, low-power timekeeping with a simple 3-wire interface