ADM697AR

微处理器监控电路 Microprocessor Supervisory Circuits

Product Details

The ADM696/ADM697 supervisory circuits offer complete single chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include µP reset, backup-battery switchover, watchdog timer, CMOS RAM write protection, and power failure warning.

The ADM696/ADM697 are available in 16-pin DIP and small outline packages and provide the following functions:

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Power-On Reset output during power-up, power-down and brownout conditions. The RESET voltage threshold is adjustable using an external voltage divider. The RESET output remains operational with VCC as low as 1 V.

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A Reset pulse if the optional watchdog timer has not been toggled within specified time.

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Separate watchdog time-out and low line status outputs.

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Adjustable reset and watchdog timeout periods.

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A 1.3 V threshold detector for power fail warning, low battery detection, or to monitor a power supply other than VCC.

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Battery backup switching for CMOS RAM, CMOS micro-processor or other low power logic

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ADM696.

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Write protection of CMOS RAM or EEPROM ADM697.

The ADM696/ADM697 is fabricated using an advanced epitaxial CMOS process combining low power consumption 5 mW, extremely fast Chip Enable gating 5 ns and high reliability. RESET assertion is guaranteed with VCC as low as 1 V. In addition, the power switching circuitry is designed for minimal voltage drop thereby permitting increased output current drive of up to 100 mA without the need for an external pass transistor.

### Features and Benefits

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Superior Upgrade for MAX696/MAX697

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Specified Over Temperature

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Adjustable Low Line Voltage Monitor

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Power OK/Reset Time Delay

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Reset Assertion Down to 1 V VCC

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Watchdog Timer—100 ms, 1.6 s, or Adjustable

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Low Switch On Resistance

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1.5 O Normal, 20 O in Backup

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600 nA Standby Current

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Automatic Battery Backup Switching ADM696

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Fast On-Board Gating of Chip Enable Signals ADM697

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Voltage Monitor for Power Fail or Low Battery Warning