AMS26 - Advanced Monolithic Systems

Advanced
Monolithic
Systems
AMS26
VOLTAGE DETECTOR
RoHS compliant
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
2
3
GND
VOUT
VOUT
GND
VIN
Bottom View
Advanced Monolithic Systems, Inc.
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 25 sec)
300mW
150mW
-40°C to +125°C
265°C
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at TA=25°C, unless otherwise noted.
PARAMETER
(Note 2)
Detector Threshold (VDET)
Min.
-2.0
Detector Threshold Hysteresis
Supply Current
+2.0
(VDET) * 2%
%
(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
1.50
VIN = 2.0V
VIN = 3.0V
VIN = 4.0V
VIN = 5.0V
1.5
3.0
4.0
5.0
4.2
10.00
7.7
10.1
11.5
13.0
Output Delay Time
Detector Threshold
Temperature Coefficient
Units
Max.
VIN = 2.0V
Operating Voltage
Output Current
AMS26-X
Typ.
CONDITIONS
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
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS26
TIME CHART
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 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.
Detector Threshold Test Circuit
VIN
Output Current Test Circuit
VIN
VIN
AMS26
SERIES
100kΩ
VIN
R
AMS26
SERIES
VDET
OUT
GND
GND
IOU
T
+VDET
OUT
GND
GND
Advanced Monolithic Systems, Inc.
GND
www.advanced-monolithic.com
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
VIN
CPU
RESET
GND
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
VIN
CPU
RESET
GND
VIN
OUT AMS26
SERIES
GND
GND
Detector Threshold Changing Circuit
VIN
Changed Detector Threshold =
R1
OUT
AMS26
SERIES
R1 + R2
(-VDET)
R2
VIN
Hysteresis Voltage =
GND
R2
C
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
AMS26 OUT
SERIES
VDET2
VDET2
VIN
100Ω
OUT
GND
GND
OUT
GND
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723