Advanced Monolithic Systems
FEATURES
• 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
AMS26
VOLTAGE DETECTOR
APPLICATIONS
• 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 3 LEAD SOT-23 AMS26M-XA OPERATING TEMPERATURE RANGE -30 to +80° C
TO-92 TYPE OPEN DRAIN AMS26N-XA X= Detector Threshold Setting.
PIN CONNECTIONS
TO-92 Plastic Package (N)
1 2 3
3L SOT-23 (M)
VIN
VOUT
VIN
GND
VOUT
GND
Bottom View
Top View
Advanced Monolithic Systems, Inc.
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
Detector Threshold (VDET) Detector Threshold Hysteresis Supply Current VIN = 2.0V VIN = 3.0V VIN = 4.0V VIN = 5.0V Operating Voltage Output Current VIN = 2.0V VIN = 3.0V VIN = 4.0V VIN = 5.0V Output Delay Time Detector Threshold Temperature Coefficient -30°C≤TA≤+80°C ± 100 1.50 1.5 3.0 4.0 5.0 7.7 10.1 11.5 13.0 1 µs ppm/°C
CONDITIONS
(Note 2)
Min.
-2.0 (VDET) * 2%
AMS26-X Typ.
Max.
+2.0 (VDET) * 5%
Units
% V µA
1.0 1.3 1.6 2.0
3.0 3.4 3.8 4.2 10.00
V mA
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 time at which the output reaches 3.5V under the conditions that TEST CIRCUITS 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 tPHL
A
B t PHL
Detector Threshold Test Circuit
Output Current Test Circuit
VIN VIN AMS26 SERIES GND GND GND 100kΩ R VDET
VIN VIN AMS26 SERIES GND GND GND IOU
T
OUT
OUT
+VDET
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS26
TYPICAL APPLICATIONS
CPU Reset Circuit
VIN VIN 100Ω R VIN CPU RESET GND
VIN1 VIN 100Ω R VIN CPU RESET GND
VIN2
AMS26 SERIES GND
AMS26 SERIES GND
OUT
OUT
Input Voltage to AMS26 is the same as the input voltage to CPU.
Input Voltage to AMS26 is different from the input voltage to CPU.
Output Delay Time Circuit
VIN VIN 100Ω R VIN CPU RESET GND
Voltage Level Indicator Circuit (lighted when the power runs out)
VIN VIN OUT AMS26 SERIES GND
AMS26 OUT SERIES GND
Detector Threshold Changing Circuit
VIN R1 OUT AMS26 SERIES GND VIN
Changed Detector Threshold =
R1 + R2 (-VDET) R2
Hysteresis Voltage =
C 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
VIN VIN 100Ω OUT
VDET1 VIN VDET2
VIN AMS26 OUT SERIES VDET1 GND
AMS26 OUT SERIES VDET2 GND
GND OUT GND
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
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