AS1909

www.DataSheet4U.com AS1907, AS1908 , AS1909 L o w - Vo l ta g e M i c r o p r o c e s s o r R e s e t C i r c u i ts D a ta S he e t 1 General Description The AS1907/AS1908/AS1909 microprocessor supervisory circuits are ideal for monitoring the supply voltage of digital systems and microprocessors. The devices are designed to initiate a reset if the supply voltage goes below a predefined threshold. The duration of the reset is either 1.5, 30, or 150ms (typ.) after the supply voltage has risen above the pre-set threshold (see Ordering Information on page 9). The devices are available as the standard products listed in Table 1. Table 1. Standard Products Model AS1907 AS1908 AS1909 Output Type Push/Pull Push/Pull Open-Drain Reset Type Active-Low Active-High Active-Low 2 Key Features ! 3 Output Types: Push/Pull RESET, Push Pull RESETN, and Open Drain RESETN Reset Threshold Range: 1.6 to 2.5V (~100mV increments) RESET/RESETN: - Valid to VCC = 0.7V (AS1907 and AS1908) - Valid to VCC = 1.0V (AS1909) Reset Pulse Widths: 1, 20, and 100ms Supply Voltage Range: +0.7 to +3.6V Supply Current Range: 2.6 to 7.0µA Power Supply Transient Immunity Requires No External Components Operating Temperature Range: -40 to +125ºC 3-pin SOT23 Package ! ! ! ! ! ! ! ! The reset thresholds are factory-set between 1.6 and 2.5V in steps of approximately 100mV (see Table 5 on page 7). The devices exhibit excellent reliability, and can reduce system costs by eliminating the need for external component...