AS1923 Datasheet

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Data sheet
AS1923
Q u a d - Vo l ta g e M i c r o p r o c e s s o r S u p e r v i s o r y C i r c u i t
1 General Description
2 Key Features
Simultaneous Quad-Voltage Monitoring
The AS1923 microprocessor supervisory circuit was designed to
monitor up to four system supply voltages without the need for external components, and asserts a single reset if any of the monitored
supply voltages drops below its reset threshold.
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Precision Factory-Trimmed Reset Threshold Options: +5.0,
+3.3, +3.0, +2.5, +1.8, and -5.0V
User-Adjustable Voltage Monitoring Threshold Options
The AS1923 features an active-low reset output that is asserted
when any of the 4 monitored voltages are below their respective
reset threshold. The reset output is open-drain with a weak internal
pullup (10µA) to IN2. Reset remains low for a specified reset timeout
period (120ms min) after all voltages have stabilized. The output is
valid as long as the IN1 or IN2 input voltage remains >1V.
Low Supply Current: 55µA
Open-Drain – AS1923A
Reset Timeout Period: 120ms
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10µA Current Source Pullup – AS1923B
RESET Valid to IN1 = 1V or IN2 = 1V
A wide range of factory-trimmed threshold voltages are available to
accommodate many different supply voltages/tolerances with minimal external component requirements.
External Components not Required
Factory-trimmed options are available for monitoring +5.0, +3.3,
+3.0, +2.5, +1.8, and -5.0V supplies with -5% and/or -10% tolerances. The device is also available with one or two user-adjustable
threshold options (via external resistor-divider network) if non-standard voltage thresholds are required.
6-pin SOT23 Package
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Minimal external component requirements, small size, and wide temperature range (-40 to +85°C) greatly improves reliability compared
to individual supervisory circuits or discrete components.
Immune to Fast INx Transients
Guaranteed Performance: Operating Temperature Range = -40
to +85ºC
The AS1923 is available in an 6-pin SOT23 package.
3 Applications
The device is ideal for portable and battery-powered systems,
embedded controllers, intelligent instruments, automotive systems,
critical CPU monitoring, and any multi-supply application.
Figure 1. AS1923 - Typical Application
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Monitoring
Voltage 1
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Monitoring
Voltage 2
Monitoring
Voltage 4
5
IN2
AS1923
6
3
RESETN
RESETN
CPU
IN3
1
IN4
GND
2
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Monitoring
Voltage 3
IN1
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Revision 1.01
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AS1923
Datasheet - P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
Pin Descriptions
Table 1. Pin Descriptions
Pin Number
Pin Name
1
IN4
2
GND
5 IN2
4 IN1
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RESETN 3
AS1923
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GND 2
6 IN3
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IN4 1
Description
Input Voltage 4. See Ordering Information on page 14 for monitored voltages.
Ground
3
RESETN
4
IN1
5
IN2
6
IN3
Reset Output. AS1923A (see Ordering Information on page 14) supports an external pullup resistor; AS1923B
contains an internal 10µA current source pullup. RESETN goes low (reset asserted) when any one of the INx
voltages goes below its specified threshold. After all inputs have stabilized, RESETN remains low for at least
120ms (min) before going high.
Input Voltage 1. See Ordering Information on page 14 for monitored voltages.
Input Voltage 2. See Ordering Information on page 14 for monitored voltages.
Note: IN2 is the power supply input for the AS1923.
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Input Voltage 3. See Ordering Information on page 14 for monitored voltages.
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AS1923
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only, and functional operation of
the device at these or any other conditions beyond those indicated in Electrical Characteristics on page 4 is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Max
Units
IN1, IN2 (Monitored Voltage), IN3, IN4 to GND
-0.3
+7
V
IN4 to GND (Device Variants M, N, O, and P, see Table 5
on page 14)
-7
+0.3
V
RESETN to GND
-0.3
+6
V
Latchup immunity
Comments
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Min
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Parameter
Electrical Parameters
Class I Level A in accordance with EIA/JEDEC 78
Continuous Power Dissipation
Continuous Power Dissipation
(TAMB = +70ºC)
mW
Derate 8.7mW/ºC above +70ºC
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Temperature Ranges and Storage Conditions
Junction Temperature
Storage Temperature Range
-55
Package Body Temperature
Humidity non-condensing
ºC
ºC
+260
ºC
85
%
1
The reflow peak soldering temperature (body
temperature) specified is in accordance with IPC/JEDEC
J-STD-020 “Moisture/Reflow Sensitivity Classification for
Non-Hermetic Solid State Surface Mount Devices”.
The lead finish for Pb-free leaded packages is matte tin
(100% Sn).
Represents a max. floor life time of unlimited
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Moisture Sensitive Level
5
+150
+150
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AS1923
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
VIN2 = +1V to +5.5V, Typ values @ VIN2 = +3.0V to +3.3V, TAMB = +25ºC (unless otherwise specified).
Table 3. Electrical Characteristics
Tamb
Operating Temperature Range
VIN2
Supply Voltage Range
IINx
Conditions
2, 3
Min
Typ
Max
Units
-40
85
°C
1.0
5.5
V
VINx = Input Threshold Voltage (Input Threshold
Voltage of 1.8, 2.5, or 5V)
25
VIN2 = Input Threshold Voltage (Input Threshold
4
Voltage of 3.0 or 3.3V)
55
Input Current
VINx = 0 to VIN2
5
(Input Threshold Voltage = +1.23V)
115
µA
-0.1
0.1
0.4
1.5
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VIN1 = 1.5V (AS1923 K/L only)
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Parameter
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1
Symbol
VINx = -5V (Input Threshold Voltage = -5V)
Reset Threshold Voltage
VTH
Adjustable Threshold
VTH
-15
-20
VINx Decreasing, +5V (-5%) Threshold
4.50
4.63
4.75
VINx Decreasing, +5V (-10%) Threshold
4.25
4.38
4.50
VINx Decreasing, +3.3V (-5%) Threshold
3.00
3.08
3.15
VINx Decreasing, +3.3V (-10%) Threshold
2.85
2.93
3.00
VINx Decreasing, +3.0V (-5%) Threshold
2.70
2.78
2.85
VINx Decreasing, +3.0V (-10%) Threshold
2.55
2.63
2.70
VINx Decreasing, +2.5V (-10%) Threshold
2.13
2.19
2.25
VINx Decreasing, +1.8V (-10%) Threshold
1.53
1.58
1.62
VINx Increasing, -5V (+5%) Threshold
-4.75
-4.63
-4.50
VINx Increasing, -5V (+10%) Threshold
-4.50
-4.38
-4.25
VINx Decreasing
1.20
1.23
1.26
Threshold Voltage
Temperature Coefficient
Threshold Hysteresis
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VHYS
Reset Delay
tRP
Reset Active Timeout Period
120
V
60
ppm/ºC
0.5
%
20
µs
200
280
ms
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tRD
VINx = VTH to (VTH - 50mV),
All Inputs Except -5V, or
VINx = VTH to (VTH + 50mV), -5V Input Only
V
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AS1923
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
Table 3. Electrical Characteristics (Continued)
Parameter
VOL
1
Output Low Voltage
Conditions
Min
Typ
VIN2 = 5V, ISINK = 2mA
0.4
VIN2 = 2.5V, ISINK = 1.2mA
0.4
VIN1 = VIN2 = 1V, ISINK = 50µA
VOH
IOH
Max
V
0.4
6
Output High Voltage,
Output High Source Current
VIN2 > 2.55V, ISOURCE = 6µA
(Reset Not Asserted)
0.8 x
VIN2
5
Output High Source Current
VIN2 ≥ 2.55V (Reset Not Asserted),
VOUT ≥ 0.8 x VIN2
6
V
10
µA
100% production tested at TAMB = +25ºC. Limits over temperature guaranteed by design.
The device is powered from input IN2.
The RESETN output is guaranteed to be in the correct state for IN1 or IN2 down to 1V.
Monitored voltage at IN2 (+3.3V, +3.0V) is also the device power supply. Supply current split is 25µA for the resistor-divider network (for
the monitored voltage) and 30µA for other circuits.
5. Adjustable pin only.
6. AS1923B only.
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1.
2.
3.
4.
Units
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Symbol
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Note: All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality
Control) methods.
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AS1923
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
7 Typical Operating Characteristics
Tamb = +25ºC, unless otherwise noted
Figure 3. IN2 Input Current vs. IN2 Input Voltage
Figure 4. IN2 Input Current vs. Temperature
70
70
65
60
55
3
3.5
65
VIN2 = 3.3V
60
VIN2 = 3.0V
55
4
4.5
5
50
-40
5.5
-20
IN2 Input Voltage (V)
0
20
40
60
80
Temperature(°C)
Figure 5. Reset Delay vs. Reset Threshold Overdrive;
VIN2 = 3.0V, IN decreasingVIN2 = 3.0V, IN decreasing
80
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IN2 Input Current (mA) .
80
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IN2 Input Current (mA) .
85
Figure 6. Reset Timeout Periode vs. Temperature;
Reset Timeout Periode (ms)
Reset Delay (µs)
.
.
225
60
40
20
0
0
200
400
600
800
1000
220
215
210
205
200
195
-40
Reset Threshold Overdrive (mV)
-15
10
35
60
85
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Temperature (°C)
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AS1923
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 7. Normalized Threshold Error vs. Temperature;
VIN2 = 3.0V
Normalized Threshold Error (%)
.
0.1
VTH = 5.0V
0
VTH = 1.8V
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-0.1
-0.2
-0.4
-40
-20
0
20
40
60
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-0.3
80
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Temperature(°C)
2V/Div
VIN1
VOUT
50ms/Div
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5µs/Div
1V/Div
2V/Div
Figure 9. Reset Active Timeout Periode; VIN2 = 3.0V
1V/Div
VOUT
VIN1
Figure 8. Reset Delay; VIN2 = 3.0V
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AS1923
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1923 is a very small, low-power, quad-voltage microprocessor supervisory circuit designed to maintain system integrity in multi-supply
systems (see Figure 10). The device offers several factory-trimmed under-voltage threshold values that minimize or eliminate the need for external components.
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Preset voltage monitoring values of +5.0, +3.3, +3.0, +2.5, +1.8, and -5.0V (see Ordering Information on page 14) are available for a wide range
of applications such as telecommunications equipment, desktop and notebook computers, high-end printers, data storage equipment, and networking equipment applications.
The device is powered via the IN2 input (3.0 to 3.3V) and a reset is asserted if VIN1 or VIN2 is > 1V. For improved performance, the AS1923 was
also designed to ignore fast INx transients.
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Figure 10. AS1923 - Block Diagram
+
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IN1
–
IN1
5
IN2
3V
5V Pullup
+
3
–
RESETN
Timeout
(220ms)
6
IN3
+
–
1
IN4
+
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–
Bandgap
Reference
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AS1923
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Optional on AS1923B Only
The quad-voltage monitor/reset circuitry includes an accurate bandgap reference, four precision comparators, and a series of internal trimmed
resistor-divider networks to set the factory-trimmed reset threshold values.
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The resistor networks scale the specified INx reset voltages to match the internal bandgap reference/comparator voltage. User-adjustable
threshold options bypass the internal resistor networks and connect directly to one of the comparator inputs (an external resistor-divider network
is required for threshold matching).
Each of the internal comparators has a typical hysteresis of 0.5% with respect to its reset threshold. This built-in hysteresis improves device
immunity to ambient noise without significantly reducing threshold accuracy when an input sits at its specified reset voltage.
Note: Threshold voltage options (fixed and adjustable) are designated by the single-letter code in the model number (see Ordering Information on page 14).
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AS1923
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
Reset Output
INx
VTHL
RESETN
tRD
tRP
90%
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10%
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Figure 11. RESETN Output Timing Diagram
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The AS1923 RESETN output is asserted low when any of the monitored INx voltages drop below its specified reset threshold (above for -5V
option) and remains asserted for the duration of the reset timeout period (120ms minimum) after all inputs have stabilized (Figure 11).
The AS1923B output driver is driven by an internal 10µA current source pullup resistor. For most applications there is no need for an external
pullup resistor to interface with other logic supplies.
Note: An external pullup resistor must not be connected to the AS1923B.
The AS1923A supports an external pullup resistor to any voltage from 0 to +5.5V if interfaced to non-standard logic supply voltages (see Figure
12).
Figure 12. Interfacing to Various Logic Supply Voltages
+5V
VCC
100kΩ
3
RESETN
RESETN
CPU
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AS1923A
2
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GND
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AS1923
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
User-Adjustable Thresholds
The AS1923 provides several voltage monitoring values as well as user-adjustable reset thresholds.
The threshold voltage at each adjustable INx input is typically 1.23V. To monitor a voltage >1.23V, connect a resistor-divider network to the circuit
as shown in Figure 13.
R1
+
R2
–
+
VREF =
1.23V
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VINTH
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Figure 13. Setting User-Adjustable Thresholds
For the circuit shown in Figure 13, calculate R1 and R2 as:
or, calculated in terms of R1:
R1 + R2
V INTH = 1,23V × ------------------R2
(EQ 1)
V INTH
R 1 = R 2 × ⎛ ---------------- – 1⎞
⎝ 1,23V
⎠
(EQ 2)
Note: Because the AS1923 has a guaranteed input current of ±0.1µA on its adjustable inputs, resistor values up to 100kΩ can be used for
R2 with <1% error.
Unused Inputs
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The IN2 input must always be used for normal operation (AS1923 power-supply pin). Otherwise, in cases where one or more of the AS1923
monitoring inputs will not be used, these inputs must be tied to a supply voltage greater in magnitude than their specified threshold voltages.
Notes:
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1. For unused IN3 or IN4 applications with positive thresholds (fixed or adjustable), the inputs can be connected directly to the IN2 supply.
2. For unused IN4 options with negative thresholds, the input must be tied to a more negative supply.
3. Unused pins must not be connected to ground or allowed to float.
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AS1923
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Negative Voltage Monitoring Beyond -5V
The AS1923 is available with options to monitor -5V supplies using internally trimmed thresholds. In cases where monitored supplies are more
negative than -5V, an external low-impedance resistor-divider network can be used as shown in Figure 14.
R2
–
-5V
R1
+
VREF =
1.23V
–
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VINTH
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Figure 14. Negative Voltage Monitoring Beyond -5V
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The current through the external resistor-divider should be greater than the input current for the -5V monitor options. For an input monitor current
error of <1%, the resistor-divider current should be ≥ 2mA (for IIN4 = 20µA max).
For the circuit shown in Figure 14, calculate R1 based on the desired VINx reset threshold voltage:
V INTH
R 1 = R 2 × ⎛ ---------------- – 1⎞
⎝ 1,23V
⎠
Where:
(EQ 3)
R2 ≤ 2.49kΩ
VINTH is the desired threshold voltage.
VTH is the internal threshold voltage.
For -VIN = -12V nominal:
VINTH = -11.1V,
VTH = -4.63V,
R2 = 2.49kΩ.
Using the equation given in (EQ 3), R1 can be calculated as:
Therefore, R1 = 3.48kΩ
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– 11,1V
R 1 = 2,49kΩ × ⎛ ------------------- – 1⎞
⎝ – 4,63V
⎠
Power-Supply Bypassing and Grounding
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The AS1923 is powered from the IN2 supply input. All monitor inputs are immune to fast supply transients.
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If higher immunity is required in noisy systems, connect 0.1µF bypass capacitors from the IN2 input to ground (see Figure 15). Additional capacitance can be added to IN1, IN3, and IN4 to improve noise immunity at these inputs.
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Figure 15. IN2 Additional Noise Immunity
5
3.0 to
3.3V
IN2
0.1µF
AS1923
2
GND
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Revision 1.01
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AS1923
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
10 Package Drawings and Markings
Figure 16. 6-pin SOT23 Marking
Top Marking
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Bottom Marking
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xxxx- encoded Datacode
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AS1923
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
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Figure 17. 6-pin SOT23 Package
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AS1923
Datasheet - O r d e r i n g I n f o r m a t i o n
11 Ordering Information
The device is available as the standard products listed in Table 4.
Table 4. Ordering Information
Descriptiom
Delivery Form
Package
AS1923A-BSTT-A
ASJD
Quad-Voltage Microprocessor Supervisory Circuit
with Open Drain Output
Tape and Reel
6-pin SOT23
AS1923A-BSTT-C
ASJF
Quad-Voltage Microprocessor Supervisory Circuit
with Open Drain Output
Tape and Reel
AS1923A-BSTT-I
ASJP
Quad-Voltage Microprocessor Supervisory Circuit
with Open Drain Output
Tape and Reel
AS1923A-BSTT-K
ASJR
Quad-Voltage Microprocessor Supervisory Circuit
with Open Drain Output
Tape and Reel
AS1923A-BSTT-O
ASJV
Quad-Voltage Microprocessor Supervisory Circuit
with Open Drain Output
Tape and Reel
6-pin SOT23
AS1923A-BSTT-x*
tbd
Quad-Voltage Microprocessor Supervisory Circuit
with Open Drain Output
Tape and Reel
6-pin SOT23
tbd
Quad-Voltage Microprocessor Supervisory Circuit
with Internal 10µA Current Source Pullup Output
Tape and Reel
6-pin SOT23
AS1923B-BSTT-x*
*) on request
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Marking
6-pin SOT23
6-pin SOT23
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6-pin SOT23
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Ordering Code
Note: All products are RoHS compliant.
Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect
For further information and requests, please contact us mailto:sales@austriamicrosystems.com
or find your local distributor at http://www.austriamicrosystems.com/distributor
These devices are available in factory-set input voltage thresholds. Choose the desired reset threshold suffix from Table 5 and insert it instead of
“x” in the part number.
Table 5. Variants Suffix Guide (x)
Variant (x)
A
1
C
D
1
E
1
F
G
5.0V
3.3V
2.5V
5.0V
3.3V
2.5V
5.0V
3.3V
1.8V
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B
3.3V
5.0V
3.0V
1
5.0V
3.0V
1
5.0V
3.0V
5.0V
3.0V
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5.0V
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Thresholds
IN2
IN3
ca
IN1
1
1.8V
2
2
2.5V
2.5V
2
1.8V
1.8V
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2
IN4
Tolerance
adjustable
10%
adjustable
5%
adjustable
10%
adjustable
5%
adjustable
10%
adjustable
5%
adjustable
10%
adjustable
5%
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AS1923
Datasheet - O r d e r i n g I n f o r m a t i o n
Table 5. Variants Suffix Guide (x)
5.0V
3.3V
2.5V
2
J
5.0V
3.3V
2.5V
2
K
adjustable
3.3V
2.5V
1.8V
2
10%
5%
adjustable
10%
adjustable
5%
L
1
adjustable
3.3V
M
1
5.0V
3.0V
adjustable
-5.0V
10%
N
1
5.0V
3.0V
adjustable
-5.0V
5%
O
5.0V
3.3V
adjustable
-5.0V
10%
P
5.0V
3.3V
adjustable
-5.0V
5%
2.5V
2
1.8V
Tolerance
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1. Available upon request
2. Specified for 10% tolerances
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IN1
Thresholds
IN2
IN3
Variant (x)
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AS1923
Datasheet
Copyrights
Copyright © 1997-2011, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®.
All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of
the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
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Disclaimer
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Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale.
austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding
the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at
any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for
current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range,
unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are
specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100
parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location.
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The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not
be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use,
interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing,
performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of
austriamicrosystems AG rendering of technical or other services.
Headquarters
ni
Contact Information
ch
austriamicrosystems AG
Tobelbaderstrasse 30
A-8141 Unterpremstaetten, Austria
Te
Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
http://www.austriamicrosystems.com/contact
www.austriamicrosystems.com/Supervisors/AS1923
Revision 1.01
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