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DS1302N

Name: DS1302N
Rating: 4.7 (12 reviews)

IC RTC CLK/CALENDAR SER 8-DIP

製造商
製造商。部分 #DS1302N
包 8-DIP (0.300, 7.62mm)
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規格

Supplier	Analog Devices Inc./Maxim Integrated
Package	Tube
ProductStatus	Active
Type	Clock/Calendar
Features	Leap Year, NVSRAM, Trickle-Charger
MemorySize	31B
TimeFormat	HH:MM:SS (12/24 hr)
DateFormat	YY-MM-DD-dd
Interface	3-Wire Serial
Voltage-Supply	2V ~ 5.5V
Voltage-SupplyBattery	2V ~ 5.5V
Current-Timekeeping(Max)	0.3µA ~ 1µA @ 2V ~ 5V
OperatingTemperature	-40°C ~ 85°C
MountingType	Through Hole
Package/Case	8-DIP (0.300, 7.62mm)

概述

Description

DS1302N is a stand-alone real-time clock/calendar with battery-backup and non-volatile RAM. It keeps time (seconds, minutes, hours, date, month, day-of-week, year) and provides 56 bytes of NV RAM for data storage. It uses a simple 3-wire serial interface (CE, SCLK, I/O), not I2C or SPI, and can be powered from main supply (2–5.5 V) or a backup VBAT when power is off. It includes a 32.768 kHz oscillator and a trickle-charge circuit to charge a backup battery from the main supply. Time values are stored in BCD and support 12- or 24-hour formats; a clock-halt bit in seconds can stop the clock for debugging. Read/write operations are done via an address/data protocol. Packages include DIP8 and various SMD options. Common applications are clocks, timers, and data logging with timestamping. DS1302N is the RoHS-compliant variant of the DS1302.

Features

DS1302N features (concise):
- Real-time clock/calendar with seconds, minutes, hours, day, date, month, year; supports leap years and 12/24-hour formats
- 32.768 kHz oscillator input for accurate timekeeping
- Battery backup via VBAT to preserve time when VCC is off
- Trickle-charge circuit to maintain a backup source (battery or supercapacitor)
- 31 bytes of on-chip RAM for user data storage (NV RAM)
- 3-wire serial interface: CE (chip enable), CLK, and IO (bidirectional data line) for easy read/write of time and RAM
- Simple register map for time and RAM access; no external RAM needed
- Available in common 8-pin packages suitable for compact designs
Optional notes:
- Operates from VCC with power-loss backup via VBAT; designed for low-power, battery-backed timing applications.

Package

DS1302N is an 8-pin device, typically in a DIP-8 (through-hole) package; it is also available in an 8-pin SOIC/SO-8 surface-mount package.

Pinout

- Pin count: 8 pins (DIP-8/SO-8 package).
- Function: Serial real-time clock/calendar with battery backup. Uses a 3-wire interface (CE, SCLK, IO) to read/write time and RAM. Requires external 32.768 kHz crystal connected to X1/X2, and a VBAT backup supply. It also provides 31 bytes of battery-backed RAM.

Manufacturer

- Manufacturer: Dallas Semiconductor Corp.
- What kind of company: An American semiconductor company that designs and manufactures integrated circuits (ICs), including real-time clocks and 1‑Wire devices; it was later acquired by Maxim Integrated (now part of Analog Devices).

Application

DS1302N is a low-power real-time clock with RAM and alarm/timer features. Common applications:
- Embedded systems for real-time clock and calendar
- Data loggers and metering for time-stamped records
- Alarm/timer and scheduling in appliances and automation
- Backed-up timekeeping during power loss (battery backup)
- Digital clocks, wearables, and IoT devices
- Instrumentation requiring calendar, timing, and event stamping