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DS1642 Datasheet Nonvolatile Timekeeping Ram

Manufacturer: Maxim Integrated (now Analog Devices)

Overview: 19-5266; Rev 5/10 DS1642 Nonvolatile Timekeeping RAM www.maxim-ic.

General Description

PIN NAME FUNCTION 1 A7 2 A6 3 A5 4 A4 5 A3 6 A2 Address Input 7 A1 8 A0 19 A10 22 A9 23 A8 9 DQ0 10 DQ1 11 DQ2 13 14 DQ3 DQ4 Data Input/Output 15 DQ5 16 DQ6 17 DQ7 12 GND Ground 18 CE Active-Low Chip-Enable Input 20 OE Active-Low Output-Enable Input 21 WE Active-Low Write-Enable Input 24 VCC Power-Supply Input DS1642 DESCRIPTION The DS1642 is a 2k x 8 nonvolatile static RAM and a full-function real-time clock (RTC), both of which are accessible in a bytewide format.

The nonvolatile time keeping RAM is pin and function equivalent to any JEDEC-

Key Features

  • Integrated NV SRAM, Real-Time Clock, Crystal, Power-Fail Control Circuit, and Lithium Energy Source.
  • Standard JEDEC Bytewide 2k x 8 Static RAM Pinout.
  • Clock Registers are Accessed Identically to the Static RAM. These Registers are Resident in the Eight Top RAM Locations.
  • Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power.
  • Access Times of 85ns and 100ns.
  • Quartz Accuracy ±1 Minute a Month at +25°C, Factory Calibrated.
  • BCD-Coded Year, Mon.

DS1642 Distributor

More Datasheets from Maxim Integrated (now Analog Devices)

Part Number Description
DS1644 Nonvolatile Timekeeping RAM
DS1644P Nonvolatile Timekeeping RAM
DS1646 Nonvolatile Timekeeping RAM
DS1646P Nonvolatile Timekeeping RAM
DS1647 Nonvolatile Timekeeping RAM
DS1647P Nonvolatile Timekeeping RAM
DS1602 Elapsed Time Counter
DS1603 Elapsed Time Counter
DS1620 Digital Thermometer/Thermostat
DS1621 Digital Thermometer