Advanced Monolithic Systems AMS26 VOLTAGE DETECTOR FEATURES APPLICATIONS • Very Low Supply Current • Wide Operating Voltage Range • 2% Precision Voltage Detection • V-detect 1.45V to 4.6V in 0.05V increments • V-detect 4.6V to 7.95V in 0.1V increments • 2.5% 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 NPN open collector output. The detector threshold is set from 1.45V to 4.6V in 0.05V increments and 4.6V to 7.9 in 0.1V increments. Also available from 7.9V to 12V in 170mV 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) VIN 1 VOUT 2 VIN 3 GND Bottom View Advanced Monolithic Systems, Inc. VOUT GND Top View www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS26 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage Output Voltage Output Current Operating Temperature Range 16V GND - 0.3V toVIN+0.3V 20mA -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 Detector Threshold (VDET) -2.0 Detector Threshold Hysteresis Supply Current +2.0 (VDET) * 2% Units % (VDET) * 5% 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 4.2 1.50 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 Max. VIN = 2.0V Operating Voltage Output Current AMS26-X Typ. Min. (Note 2) mA 1 ± 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 VIN 2 1 VOUT + VREF 3 GND Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS26 TIME CHART OUTPUT DELAY TIME +VDET +2.0V 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 VIN is Time A, and the timeCIRCUITS at which the output reaches 3.5V under the conditions that TEST the output pin (OUT) is pulled up to 7V by a resistor of 100kΩ is Time B. Supply Voltage (V IN ) 1.2V GND 7.0V Output Voltage ( OUT) 3.5V GND A tPHL Detector Threshold Test Circuit VIN t PHL Output Current Test Circuit VIN VIN AMS26 SERIES 100kΩ OUT VIN R AMS26 SERIES VDET GND GND B IOU T OUT +VDET GND GND Advanced Monolithic Systems, Inc. www.advanced-monolithic.com GND Phone (925) 443-0722 GND Fax (925) 443-0723 AMS26 TYPICAL APPLICATIONS CPU Reset Circuit VIN VIN 100Ω R AMS26 SERIES VIN VIN CPU RESET GND OUT VIN2 VIN1 100Ω R AMS26 SERIES OUT 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) VIN VIN 100Ω R AMS26 OUT SERIES VIN CPU RESET GND VIN VIN VIN CPU RESET GND OUT AMS26 SERIES GND GND Detector Threshold Changing Circuit VIN Changed Detector Threshold = R1 OUT AMS26 SERIES VIN Hysteresis Voltage = GND R2 C R1 + R2 (-VDET) R2 R1 + R2 (-VHYS) 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 VIN VIN VIN AMS26 OUT SERIES VDET1 GND VIN 100Ω AMS26 OUT SERIES VDET2 VDET2 OUT GND GND OUT GND Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723