DS1302S+

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DS1302S+

IC RTC CLK/CALENDAR SER 8-SOIC

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  • Fr. Teil #DS1302S+
  • Paket SOP8
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Spezifikationen

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

Übersicht

Description

DS1302S+ is a real-time clock/calendar IC (RTC) from Dallas/Maxim. It combines timekeeping (seconds, minutes, hours, day, date, month, year with leap-year support) with 31 bytes of non-volatile RAM and a trickle-charge circuit, all powered by a main supply (2–5.5 V) plus battery backup (VBAT). It keeps running when power is lost.
Key features:
- 32.768 kHz crystal input for accurate time
- 1 Hz SQW/OUT optional output
- 3-wire serial interface (CE, SCLK, IO) with bidirectional IO line
- 31 bytes NV RAM for user data
- CH bit in seconds register must be cleared to run the clock
- Burst/read/write and convenient bit/BCD data handling
Typical use:
- Connect Vcc and GND, VBAT to a backup source, X1/X2 to the crystal
- Use CE, SCLK, IO to read/write time and RAM
- Read/write times in BCD; avoid stopping the clock
Note: DS1302S+ is essentially the same DS1302 with possible packaging/variant tweaks. Core functionality remains RTC + RAM with trickle-charge.

Features

Here are the main features of DS1302S+ ( RTC/clock IC ):
- Real-time clock with calendar: tracks seconds, minutes, hours, date, month, day of week, year; supports 12/24-hour mode with leap-year handling.
- 32.768 kHz crystal input for accurate timekeeping.
- Battery backup with automatic switchover; built-in trickle-charge circuit to charge a backup cell or supercapacitor from Vcc.
- 31 bytes of battery-backed NV RAM for user data storage.
- 3-wire serial interface (CE, I/O, CLK) with direct register addressing (not I2C or SPI).
- Programmable SQW/OUT square-wave output for timing/synchronization.
- Wide supply voltage: typically 2.0V to 5.5V; low power operation.
- Industrial temperature range support (suitable for room to harsh environments).
- Small 8-pin package variants and straightforward software interface.
Note: DS1302S+ focuses on simple timekeeping with backup, RAM, and a flexible serial interface.

Package

DS1302S+ uses an 8-pin SOP (SOP-8) surface-mount package.

Pinout

- Pin count: 8 pins (DIP-8/SO-8 package).
- Function: Real-time clock/calendar with 32 kHz oscillator and 31 bytes of battery-backed RAM. Uses a 3-wire serial interface (CE, IO, SCLK) to access RTC registers and RAM. Power pins: VCC (main supply), GND, and VBAT (battery backup). Also supports an optional trickle-charge circuit via two pins for external diode/resistor network to charge the backup battery.

Manufacturer

- Manufacturer: Dallas Semiconductor (the DS prefix is their naming). It is now part of Maxim Integrated (and today under Analog Devices).
- Company type: a U.S. semiconductor company that designs and manufactures integrated circuits (e.g., RTCs, memory, analog/mixed-signal ICs).

Application

DS1302S+ is a battery-backed real-time clock with RAM and a trickle charger. Typical applications:
- Time-stamping and scheduling in embedded systems (data loggers, measurement/industrial controllers, POS terminals)
- Home/industrial automation, alarms and timers
- Portable/wearable devices needing offline timekeeping
- Event logging in security systems
- Medical devices requiring accurate time base

Equivalent

Common RTC equivalents/alternatives to DS1302S+ (not pin‑for‑pin drop‑in due to interface differences):
- DS1302/DS1307 (Dallas/Maxim) – 3‑wire interface, battery-backed RAM
- DS3231/DS3232 (Maxim) – I2C RTC, high accuracy
- PCF8563 (NXP) – I2C RTC with RAM
- MCP7940N / MCP7941X / MCP7950X (Microchip) – I2C RTC with RAM
- Seiko S‑35390/S‑35392 (SII) – I2C RTC options
Note: choose by interface and memory needs.

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