IN1307N 64 x 8 Serial I2C Real-Time Clock DIP-8 (IN1307N IC)
The IN1307N is a low-power, full binary-coded decimal (BCD) clock/calendar with 56 bytes of NV SRAM from IK Semiconductor. Housed in an 8-pin DIP package, it is the direct equivalent to the industry-standard DS1307. The IC provides seconds, minutes, hours, day, date, month, and year information, with automatic adjustment for months with fewer than 31 days and leap year compensation. It operates as a slave device on the I2C bus, making it highly compatible with a wide range of microcontrollers.
This IC is a staple in the Indian electronics market for building digital clocks, attendance systems, and school projects. It is an ideal component for Arduino and Raspberry Pi enthusiasts creating DIY data loggers or smart home devices that require a persistent time reference in a breadboard-friendly through-hole format.
Key Features
- Complete Timekeeping: Manages all time and date functions with leap year compensation up to 2100.
- Nonvolatile Storage: 56 bytes of general-purpose, battery-backed RAM for storing system settings.
- I2C Serial Interface: Simple two-wire communication protocol (SDA and SCL).
- Automatic Power Switching: Detects power failures and automatically switches to the backup battery supply.
- Programmable Square-Wave: Built-in output signal with selectable frequencies (1Hz, 4kHz, 8kHz, 32kHz).
- Low Power Draw: Consumes less than 500nA in battery-backup mode with the oscillator running.
Specifications
- IC Type: Real-Time Clock (RTC) / Calendar
- Operating Voltage (VCC): 4.5V to 5.5V
- Backup Battery Voltage: 2.0V to 3.5V (Standard 3V Lithium)
- Interface: I2C (Serial Data and Serial Clock)
- RAM Capacity: 56 Bytes (NV SRAM)
- Oscillator Frequency: 32.768 kHz (External crystal required)
- Package Type: PDIP-8
- Mounting Type: Through-Hole
- Operating Temperature: -40 to 85 degrees Celsius
Interfaces
- Pin 1 (X1): 32.768 kHz Crystal Input
- Pin 2 (X2): 32.768 kHz Crystal Output
- Pin 3 (VBAT): +3V Battery Input for Backup
- Pin 4 (GND): Ground
- Pin 5 (SDA): Serial Data Input/Output
- Pin 6 (SCL): Serial Clock Input
- Pin 7 (SQW/OUT): Square Wave/Output Driver
- Pin 8 (VCC): Primary +5V Power Supply
