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DS1642 - Nonvolatile Timekeeping RAM

Datasheet Summary

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-Enab

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.

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Datasheet preview – DS1642

Datasheet Details

Part number DS1642
Manufacturer Maxim Integrated
File Size 139.26 KB
Description Nonvolatile Timekeeping RAM
Datasheet download datasheet DS1642 Datasheet
Additional preview pages of the DS1642 datasheet.

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Full PDF Text Transcription

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