austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: ams sales ams.com Please visit our website at www.ams.com W orld s Lowest Power Consumption Dat a Sh eet AS1904, AS1905, AS1906 Ultra Low-Power P Supervisory Circuit 1 General Description 2 Key Features The AS1904/5/6 family is an ultra low-power supervisory Low 150nA (typical) Supply Current circuit device. Precision Monitoring of 2.5-, 3-, and 3.3V-Power Supplies The device can be used to monitor the supply voltage of digital systems and microprocessors and initiate a reset Supply Voltage Range 1.0 to 3.6V when the voltage goes below a predefined threshold. Reset Threshold Available from 2.2 to 3.1V The duration of the reset is 5/20/100/500ms (typ.) after the supply voltage has risen above the threshold. Available in three Versions The device exhibits excellent reliability and can reduce - AS1904 Push-Pull RESETN application costs by eliminating all external components. - AS1905 Push-Pull RESET The device is available with different output drivers: - AS1906 Open Drain RESETN The AS1904 has a push-pull driver with an active low 4 Time-Out Periods Ranging from 5 to 500ms reset. Detection Voltage Accuracy: 1.5% The AS1905 uses the same output stage as the AS1904, but has an active high reset. Temperature Range: -40 to +85C The AS1906 has an open drain output with active low SOT23-3 Package reset. Superior Upgrade to austriamicrosystems All devices operate down to a voltage of 1V. AS1901/2/3 Device Family The reset thresholds are factory-trimmable between 2.2V and 3.08V in steps of approximately 100mV. Each device of the AS1904/5/6 family is offered with four 3 Applications time-out periods of 5/20/100/500ms. The devices are ideal for computers, intelligent instru- The extremely low current consumption of only 150nA ments, controllers, critical microprocessor and micro- (typ) at 3.3V makes the device ideal for use in portable controller, power monitoring and portable/battery- applications. powered equipment. All devices are available in a 3-pin SOT23 package. Figure 1. Functional Block Diagrams VCC VCC 3 3 VDD VCC VDD VCC AS1904 Microprocessor AS1906 Microprocessor AS1905 2 2 RESET, RESET RESET I/O RESETN RESETN GND GND GND GND 1 1 www.austriamicrosystems.com Revision 1.41 1 - 9 ams AG Technical content still valid