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
