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DS1321 - Flexible Nonvolatile Controller

General Description

VCCI VCCO VBAT A, B - +5V Power Supply Input - SRAM Power Supply Output - Backup Battery Input - Address Inputs CEI1 - CEI4 - Chip Enable Inputs CEO1 - CEO4 - Chip Enable Outputs TOL - VCC Tolerance Select BW - Battery Warning Output (Open Drain) RST - Reset Output (Open Drain) MODE - Mod

Key Features

  • Converts CMOS SRAM into nonvolatile memory.
  • Unconditionally write-protects SRAM when VCC is out of tolerance.
  • Automatically switches to battery backup supply when VCC power failure occurs.
  • Flexible memory organization - Mode 0: 4 banks with 1 SRAM each - Mode 1: 2 banks with 2 SRAMs each - Mode 2: 1 bank with 4 SRAMs each.
  • Monitors voltage of a lithium cell and provides advanced warning of impending battery failure.
  • Signals low-battery condition on active low Batte.

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Full PDF Text Transcription for DS1321 (Reference)

Note: Below is a high-fidelity text extraction (approx. 800 characters) for DS1321. For precise diagrams, and layout, please refer to the original PDF.

19-6312; Rev 6/12 DS1321 Flexible Nonvolatile Controller with Lithium Battery Monitor FEATURES  Converts CMOS SRAM into nonvolatile memory  Unconditionally write-protec...

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verts CMOS SRAM into nonvolatile memory  Unconditionally write-protects SRAM when VCC is out of tolerance  Automatically switches to battery backup supply when VCC power failure occurs  Flexible memory organization - Mode 0: 4 banks with 1 SRAM each - Mode 1: 2 banks with 2 SRAMs each - Mode 2: 1 bank with 4 SRAMs each  Monitors voltage of a lithium cell and provides advanced warning of impending battery failure  Signals low-battery condition on active low Battery Warning output signal  Resets processor when power failure occurs and holds processor in reset during system power-up  Optional 5% or 10% power-fail detec

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