APX803S / APX809S / APX810S 3-Pin Microprocessor Supervisor/Reset Circuits

Diodes microprocessor (μP) supervisory/reset generator circuits monitor the power supplies in μP, μC, and digital systems, and issue a reset pulse at power-up and supply failure. They enhance circuit reliability by ensuring the system starts into a known state and reduce cost by eliminating external components. They are available with different reset thresholds suitable for operation with a variety of supply voltages (5 V, 3.3 V, 3.0 V, and 2.5 V). They assert a reset signal whenever the supply voltage falls below its preset threshold and is kept asserted for a minimum period of time (delay time) after V_CC has risen above the reset threshold. The outputs are guaranteed to be in the correct logic state for V_CC down to 1 V. The APX803S has an open-drain active-low output and complements Diode’s APX809S which has an active-low push-pull output stage output. The APX810S has an active-high push-pull output. All three are available with different delay times of 1.7 ms, 50 ms, or 240 ms. These products are available in different pinout SOT23 packages.

Features

• Low supply current: 10 µA minimal operating current for system efficiency
• High threshold voltage accuracy: +1.5% provides precise V_CC reset thresholds
• RESET output active when V_CC is greater than 0.9 V prevents the μP/μC from incorrect operation at power-up
• Preset recovery delay time options: 1.7 ms, 50 ms, and 240 ms meet different system requirements