Intersil ISL1208 I2C Real Time Clock/Calendar Datasheet

Datasheet for the Intersil ISL1208 low‑power I2C real‑time clock with calendar, battery‑backed SRAM and selectable frequency outputs.

Brand: Intersil
Category: Other Electronics
Document type: Datasheet
Language: English
Pages: 24
File format: PDF
File size: 1.1 MB
Published: 04 October, 2026
Updated: 04 October, 2026
Model: ISL1208
MD5 checksum: 692638B5869214CCA78E0FAE6724CCE6
PDF: Intersil ISL1208 I2C Real Time Clock/Calendar Datasheet PDF

About this manual

The ISL1208 is a low‑power real‑time clock with crystal compensation, calendar registers, power‑fail detection, a single alarm, and 2 bytes of battery‑backed SRAM. It operates from 2.0 V to 5.5 V and supports a 400 kHz I²C interface.

The device offers 15 selectable frequency outputs, automatic backup switching to a battery or super‑capacitor, and is available in 8‑lead MSOP, SOIC and TDFN packages. Applications include utility meters, HVAC equipment, audio/video components, and other industrial or automotive systems.

What's inside

Features
Pin Descriptions
Absolute Maximum Ratings
Electrical Characteristics
Timing Diagrams
Performance Curves
Power Control Operation
Alarm and Interrupt
Frequency Output
User SRAM

Specifications

I²C Interface Speed	400 kHz
Package Options	8‑lead MSOP, SOIC, TDFN

Frequently asked questions

What is the I²C data rate supported by the ISL1208?

The device supports a 400 kHz I²C data transfer rate.

How many bytes of user SRAM are available?

The device provides 2 bytes of battery‑backed user SRAM.

Download PDF (1.1 MB)