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I²C RTC/Supervisor with Trickle Charger and 512 Bytes EEPROM

Product Details

Key Features

Parametric specs for Timekeeping & Real-Time Clocks
Interface I2C
VSUPPLY (V) 2.7 to 5.5
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS:hh
Time Keeping Current (nA) (typ) 410
CL (pF) 6
Memory Type EEPROM
Memory Size (Bytes) 512
Time of Day Alarms 0
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
2.4
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Simplified Block Diagram

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Parameters

Parametric specs for Timekeeping & Real-Time Clocks
Interface I2C
VSUPPLY (V) 2.7 to 5.5
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS:hh
Time Keeping Current (nA) (typ) 410
CL (pF) 6
Memory Type EEPROM
Memory Size (Bytes) 512
Time of Day Alarms 0
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
2.4

Key Features

  • Fast (400kHz) I²C Interface
  • RTC Counts Hundredths of Seconds, Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Up to 2100
  • Programmable Watchdog Timer
  • Automatic Power-Fail Detect and Switch Circuitry
  • Reset Output with Pushbutton Reset Input Capability
  • 512 x 8 Bits of EEPROM
  • Integrated Trickle-Charge Capability for Backup Supply
  • Three Operating Voltages: 5.0V, 3.3V, and 3.0V
  • Low Timekeeping Voltage Down to 1.3V
  • -40°C to +85°C Temperature Range

Applications/Uses

  • Network-Interface Cards
  • Point-of-Sale Equipment
  • Portable Instrumentation
  • Wireless Equipment

Description

The DS1388 I²C real-time clock (RTC), supervisor, and EEPROM is a multifunction device that provides a clock/calendar, programmable watchdog timer, power-supply monitor with reset, and 512 bytes of EEPROM. The clock provides hundredths of seconds, seconds, minutes, and hours, and operates in 24-hour or 12-hour format with an AM/PM indicator. The calendar provides day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. A watchdog timer provides a reset for an unresponsive microprocessor. It is programmable in 10ms intervals from 0.01 to 99.99 seconds. A temperature-compensated voltage reference and comparator circuit monitors the status of VCC. If a primary power failure is detected, the device automatically switches to the backup supply and drives the reset output to the active state. The backup supply maintains time and date operation in the absence of VCC. When VCC returns to nominal levels, the reset is held low for a period to allow the power supply and processor to stabilize. The device also has a pushbutton reset controller, which debounces a reset input signal. The device is accessed through an I²C serial interface.

Simplified Block Diagram

DS1388: Typical Operating Circuit DS1388: Typical Operating Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .