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
V
OUT
V
IN
GND
V
OUT
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 toV
IN
+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 T
A
=25°C, unless otherwise noted.
PARAMETER
Detector Threshold (V
DET
)
Detector Threshold Hysteresis
Supply Current
V
IN
= 2.0V
V
IN
= 3.0V
V
IN
= 4.0V
V
IN
= 5.0V
Operating Voltage
Output Current
V
IN
= 2.0V
V
IN
= 3.0V
V
IN
= 4.0V
V
IN
= 5.0V
Output Delay Time
Detector Threshold
Temperature Coefficient
-30°C≤T
A
≤+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
(V
DET
) * 2%
AMS26-X
Typ.
Max.
+2.0
(V
DET
) * 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
+
-
V
REF
3 GND
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS26
TIME CHART
OUTPUT DELAY TIME
+V
DET
+2.0V
Output Delay Time t
PHL
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 +V
DET
+2.0V is applied to V
IN
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
t
PHL
A
B
t
PHL
Detector Threshold Test Circuit
Output Current Test Circuit
V
IN
V
IN
AMS26
SERIES
GND
GND
GND
100kΩ
R
V
DET
V
IN
V
IN
AMS26
SERIES
GND
GND
GND
I
OU
T
OUT
OUT
+V
DET
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS26
TYPICAL APPLICATIONS
CPU Reset Circuit
V
IN
V
IN
100Ω R
V
IN
CPU
RESET
GND
V
IN1
V
IN
100Ω R
V
IN
CPU
RESET
GND
V
IN2
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
V
IN
V
IN
100Ω R
V
IN
CPU
RESET
GND
Voltage Level Indicator Circuit
(lighted when the power runs out)
V
IN
V
IN
OUT AMS26
SERIES
GND
AMS26 OUT
SERIES
GND
Detector Threshold Changing Circuit
V
IN
R1
OUT
AMS26
SERIES
GND
V
IN
Changed Detector Threshold
=
R1
+
R2
(-V
DET
)
R2
Hysteresis Voltage
=
C
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
V
IN
V
IN
100Ω
OUT
V
DET
1
V
IN
V
DET
2
V
IN
AMS26 OUT
SERIES
V
DET1
GND
AMS26 OUT
SERIES
V
DET2
GND
GND
OUT
GND
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
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