Overview

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.

1338 - Block Diagram
1338 - Pinout
1338 - Block Diagram
1338 - Pinout
  • 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)

Documentation

Design & Development

Boards & Kits

RCTIMING-DEMO Front

RCTIMING-DEMO

Demonstration
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Renesas Timing Product Demo Kit

RCTIMING-DEMO is a Renesas products combination kit. The kit includes a Renesas RL78 MCU, DA14531MOD Bluetooth® Low Energy (LE) module, LDO, RTC (1338-31DVG) and...

Featured Documents:
VersaClock 7 Setup Process for RCTIMING-DEMO Timing Solution

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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Product Options

    Processing table
    Core Voltage (V)
    Pkg. Type
    Lead Count (#)
    Temp. Grade
    Pb (Lead) Free
    Carrier Type
    Moisture Sensitivity Level (MSL)
    Price (USD) | 1ku
    Buy / Sample
    Part Number
    1338-31DCGI
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    Samples Available
    		 2.5, 3.3, 5, 5.5 SOIC 8 I Yes Tube 1 2.431 Get Samples,
    1338-31DCGI8
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    		2.5, 3.3, 5, 5.5 SOIC 8 I Yes Reel 1 2.05
    1338-31DVGI
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    Samples Available
    		 2.5, 3.3, 5, 5.5 TSSOP 8 I Yes Tube 3 1.682 Get Samples,
    1338-31DVGI8
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    		2.5, 3.3, 5, 5.5 TSSOP 8 I Yes Reel 3
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