Advanced Monolithic Systems AMS26 VOLTAGE DETECTOR FEATURES APPLICATIONS • Very Low Supply Current • Wide Operating Voltage Range • 2% Precision Voltage Detection • Detection Threshold from 2V to 6V in 0.1V increments • 5mA Sink Current Capability • 5% Typical Hysteresis • CPU and Logic Circuit Reset • Portable and Battery Powered Equipment • Memory Battery Back-Up Circuit • Window Comparator • Cellular Phones • Pagers GENERAL DESCRIPTION The AMS26 series are voltage detector ICs featuring a high accuracy detector threshold of ±2.0% and ultra-low supply current. Internal circuit contains a precision voltage reference, a comparator, resistor network, and an output driver. The AMS26 has an N-channel open drain output. The detector threshold is set from 2.0V to 6.0V in 0.1V increments, thus making it easy to use in a variety of supervisory applications including microprocessor reset circuits, memory battery back-up circuit, battery checker, power failure detector and portable and battery powered electronics. AMS26 is available in TO-92 and the sub-miniature 3-pin SOT-23 surface mount package. ORDERING INFORMATION OUTPUT PACKAGE TYPE TO-92 TYPE OPEN DRAIN AMS26N-XA X= Detector Threshold Setting. OPERATING 3 LEAD SOT-23 AMS26M-XA TEMPERATURE RANGE -30 to +80° C PIN CONNECTIONS TO-92 Plastic Package (N) 3L SOT-23 (M) VDD 1 VOUT 2 3 GND VDD Bottom View VOUT GND Top View Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS26 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage Output Voltage Output Current Operating Temperature Range 16V VSS - 0.3V toVDD+0.3V 70mA -30°C to +80°C Power Dissipation : TO-92 package SOT-23 package Storage Temperature Lead Temperature (Soldering 10 sec) 300mW 150mW -40°C to +125°C 230°C ELECTRICAL CHARACTERISTICS Electrical Characteristics at TA=25°C, unless otherwise noted. PARAMETER CONDITIONS Min. (Note 2) Detector Threshold (VDET) -2.0 Detector Threshold Hysteresis Supply Current (VDET) * 3% +2.0 % (VDET) * 7% V 1.0 3.0 µA VIN = 3.0V 1.3 3.4 VIN = 4.0V 1.6 3.8 VIN = 5.0V 2.0 1.50 4.2 10.00 VIN = 2.0V VIN = 3.0V 1.5 3.0 7.7 10.1 VIN = 4.0V 4.0 11.5 VIN = 5.0V 5.0 13.0 Output Delay Time Detector Threshold Temperature Coefficient Units Max. VIN = 2.0V Operating Voltage Output Current AMS26-X Typ. mA 100 ± 100 -30°C≤TA≤+80°C V µs ppm/°C Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. For guaranteed performance limits and associated test conditions, see the Electrical Characteristics tables. BLOCK DIAGRAM VDD 2 1 OUT + VREF 3 GND Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS26 TIME CHART Released Voltage Detected Voltage Supply Voltage (VDD) Detector Threshold Hysteresis B A Minimum Operating Voltage GND Output Voltage (OUT) GND tPLH OUTPUT DELAY TIME Output Delay Time tPHL is defined as the time period from Time A through Time B, when the time at which a pulse voltage that increases from 1.2V to +VDET+2.0V is applied to VDD is Time A, and the time at which the output reaches 3.5V under the conditions that the output pin (OUT) is pulled up to 7V by a resistor of 100kΩ is Time B. +VDET +2.0V Supply Voltage (VDD) 1.2V GND 7.0V Output Voltage (OUT) 3.5V GND A tPHL B tPHL TEST CIRCUITS Detector Threshold Test Circuit VDD Output Current Test Circuit VDD VDD 100kΩ AMS26A SERIES OUT VDD R AMS26A SERIES VDET GND VSS IOUT OUT +VDS GND VSS VSS VSS Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS26 TYPICAL APPLICATIONS CPU Reset Circuit VDD VDD 100Ω AMS26A SERIES R VDD2 VDD1 VDD VDD OUT 100Ω AMS26A SERIES CPU RESET GND GND R OUT CPU RESET GND GND Input Voltage to AMS26 is the same as the input voltage to CPU. Output Delay Time Circuit Input Voltage to AMS26 is different from the input voltage to CPU. Voltage Level Indicator Circuit (lighted when the power runs out) VDD VDD VDD 100Ω R AMS26A OUT SERIES VDD VDD VDD CPU RESET GND OUT AMS26A SERIES GND GND Detector Threshold Changing Circuit VDD Changed Detector Threshold = R1 OUT AMS26A SERIES GND VDD Hysteresis Voltage = R2 C R1 + R2 (-V DET) R2 R1 + R2 (-V HYS) R2 When the value of R1 becomes excessively large, the detector threshold detected may differ from the value calculated using above formula. Window Comparator Circuit VDET1 VDD VDD VDD AMS26A OUT SERIES VDET1 GND VDD 100Ω AMS26A OUT SERIES VDET2 VDET2 OUT VSS GND OUT VSS Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140