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MAX6901
3-Wire Serial RTC in a TDFN


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Data Sheet
FULL DATA SHEET (PDF, 792kB)
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Description
The MAX6901 3-wire serial interface real-time clock in a TDFN package contains a real-time clock/calendar and 31 x 8 bits of static RAM (SRAM). The real-time clock/calendar provides seconds, minutes, hours, day, date, month, year, and century information. A time/date-programmable polled ALARM is included in the MAX6901. The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year up to the year 2100. The clock operates in either the 24hr or 12hr format with an AM/PM indicator. A push-pull 32kHz output is also included. The MAX6901 operates with a supply voltage of +2V to +5.5V, is available in the ultra-small 8-pin TDFN package, and works over the industrial temperature range, -40°C to +85°C.

The SOT23 package has been replaced by a TDFN. For addtional information click here.

Key Features   Applications/Uses
  • Real-Time Clock Counts Seconds, Minutes, Hours, Day of Week, Date of Month, Month, Year, and Century
  • Leap-Year Compensation Valid up to Year 2100
  • Wide +2V to +5.5V Operating Voltage Range
  • 3-Wire Serial Interface, 2MHz at 5V, 500kHz at 2V
  • 31 x 8-Bit SRAM for Scratchpad Data Storage
  • Uses Standard 32.768kHz, 12.5pF Watch Crystal
  • Low Timekeeping Current (400nA at 2V)
  • Single-Byte or Multiple-Byte (Burst Mode)Data Transfer for Read or Write of Clock Registers or SRAM
  • 8-Pin 3mm x 3mm x 0.8mm TDFN Surface-Mount Package
  • Push-Pull 32.768kHz Clock Output
  • Programmable Time/Date Polled ALARM Function
  • No External Crystal Bias Resistors or Capacitors Required

 
  • Battery-Powered Products
  • Fax Machines
  • Intelligent Instruments
  • Point-of-Sale Equipment
  • Portable Instrumentation

    Key Specifications:   Timekeeping & Real-Time Clocks
    Part Number Time Format (hh = sec/100) Date Format Interface Supply Voltage (V) Time- keeping Current (typ) (nA) CL, Load Capacitance (pF) Memory Type Memory Size (Bytes) Number of Time of Day Alarms Features Package RoHS Available Operating Temp. Range (°C) Price*
    MAX6901  HH:MM:SS YYYY-MM-DD 3-Wire 2
    3
    3.3
    5
    600 12.5 NV SRAM 31 1
    Square-Wave Output
    THIN QFN (Dual)/8 No -40 to +85 $1.45 @ 1k
    See All Timekeeping & Real-Time Clocks (87)
    Notes:
    *This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Diagram
    MAX6901: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  • App Note 616: Considerations for Maxim Real-Time Clock Crystal Selection - MAX6901
  • App Note 617: Real-Time-Clock Selection and Optimization - MAX6901
  • App Note 618: Interpreting Real-Time-Clock Registers - MAX6901
  • App Note 619: Using Maxim RTCs with 3-Wire Interface - MAX6901
  • App Note 632: Evaluating the Accuracy of Maxim Real-Time Clocks (RTCs) - MAX6901
  • App Note 3382: Interfacing a MAX6901 RTC With an 8051-Type Microcontroller - MAX6901

    Evaluation Kits
    none

    Design Guides
  • REAL-TIME CLOCKS (PDF)

    Reliability Reports
  • Show FIT data for:
  • Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-2 of 2

    MAX6901 Free
    Sample
    Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6901ETA  
    THIN QFN (Dual);8 pin;
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T833-2*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6901ETA-T  
    THIN QFN (Dual);8 pin;
    Dwg: 21-0137I (PDF)
    Use pkgcode/variation: T833-2*
    -40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis

    More Information
  • Topmark Coding: MAX6901
  • New Product Press Release 2001-09-06 
  • RTC Calculator

    Related Products
    DS1302 Trickle-Charge Timekeeping Chip
    DS1306 Serial Alarm Real-Time Clock
    MAX6900 I²C-Compatible RTC in a TDFN
    MAX6902 SPI-Compatible RTC in a TDFN
    DS1337, DS1337C I²C Serial Real-Time Clock
    DS1390, DS1391, DS1392, DS1393 Low-Voltage SPI/3-Wire RTCs with Trickle Charger

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     Description 
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    Document Ref.: 19-2085; Rev 2; 2004-05-14
    This page last modified: 2007-06-28




             



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