Overview
Description
The 1338 is a serial real-time clock (RTC) device that consumes ultra-low power and provides a full binary-coded decimal (BCD) clock/calendar with 56 bytes of battery backed Non-Volatile Static RAM. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. Access to the clock/calendar registers is provided by an I2C interface capable of operating in fast I2C mode. Built-in Power-sense circuitry detects power failures and automatically switches to the backup supply, maintaining time and date operation.
Features
- Real-Time Clock (RTC) counts seconds, minutes, hours, day, date, month, and year with leap-year compensation valid up to 2100
- 56-Byte battery-backed Non Volatile RAM for data storage
- Fast mode I2C Serial interface
- Automatic power-fail detect and switch circuitry
- Programmable square-wave output
- Packaged in 8-pin MSOP, 8-pin SOIC, or 16-pin SOIC (surface-mount package with an integrated crystal)
- Industrial temperature range (-40°C to +85°C)
Comparison
Applications
Design & Development
Boards & Kits
Renesas Timing Product Demo Kit
RCTIMING-DEMO is a Renesas products combination kit. The kit includes a Renesas RL78 MCU, DA14531MOD, Linear Regulators (LDO), RTC (1338-31DVG) and programmable clock generator VersaClock 7 (VC7) to implement a demo kit to support programming clock generator through laptop or smartphone and...
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.

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