AS1918 Supervisor IC

Description

The AS1916 - AS1918 microprocessor supervisory circuits were designed to generate a reset when the monitored supply voltage falls below a factory-trimmed threshold. The reset remains asserted for a minimum timeout period after the supply voltage stabilizes. Guaranteed to be in the correct state for VCC higher than +1.0V, these devices are ideal for portable and battery powered systems with strict monitoring requirements.

The devices feature factory-trimmed thresholds to monitor a supply voltage between 1.8V and 3.6V.

The devices are available with the reset output types:

• AS1916 Active-Low Push/Pull
• AS1917 Active-High Push/Pull
• AS1918 Active-Low Open-Drain

The AS1916 - AS1918 include a manual-reset input for systems that never fully power down the microprocessor.
Additionally, these devices feature a watchdog timer to help ensure that the processor is operating within proper code boundaries.

The AS1916 - AS1918 are available in a 5-pin SOT23 package.

Key Features

• VCC Supervisory Range: +1.8V to +3.6V
• Guaranteed Reset Valid Down to VCC = +1.0V
• Reset Timeout Delay: 215ms
• Manual Reset Input
• Three Reset Output Types
  • Active-Low Push/Pull (AS1916)
  • Active-High Push/Pull (AS1917)
  • Active-Low Open-Drain (AS1918)
• Watchdog Timeout Period: 1.5s
• Immune to Fast Negative VCC Transients
• External Components Not Required
• 5-pin SOT23 Package

Applications

The devices are ideal for portable and battery-powered systems, embedded controllers, intelligent instruments, automotive systems and critical CPU monitoring.

Block diagram for AS1918 Supervisor IC

Block diagram for AS1918 Supervisor IC