ADMOS AMS26 Voltage detector Datasheet

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
Similar pages