MAX690CPA

• Device Type: Power-Supply Monitor, Watchdog Timer, and Reset Controller
• Package: 8-Pin PDIP (CPA Suffix)

Supply Characteristics

• Operating Supply Voltage:
  • 4.0 V to 5.5 V
• Nominal Monitored Voltage:
  • 5 V Systems
• Supply Current:
  • Typically 200 µA
  • Low-power CMOS design

Reset Functions

• Precision voltage monitoring
• Automatic reset generation during:
  • Power-up
  • Power-down
  • Brownout conditions
• Reset Threshold:
  • 4.65 V Typical
• Reset Timeout Period:
  • 200 ms minimum after VCC rises above threshold
• Reset Outputs:
  • RESET (Active High)
  • RESET̅ (Active Low)

Watchdog Timer

• Built-in watchdog timer
• Detects software lockups
• Requires periodic watchdog input transitions
• Watchdog Timeout:
  • 1.6 seconds typical

Battery Backup Features

• Automatic battery switchover
• Backup battery monitoring
• Battery-backed RAM support
• Battery Switchover Voltage:
  • Automatic transition between VCC and backup battery

Power-Fail Detection

• Dedicated Power-Fail Input (PFI)
• Power-Fail Output (PFO)
• External threshold setting capability

Backup RAM Protection

• Chip Enable (CE) gating
• Prevents erroneous writes during power failure
• Protects CMOS RAM contents

Operating Temperature

• Commercial Version (CPA):
  • 0°C to +70°C

Package Information

• Package Type: PDIP
• Pin Count: 8 Pins
• Mounting: Through Hole

1. Datasheet