AS1903C31 [AMSCO]
Ultra Low-Power uP Supervisory Circuit; 超低功耗高达监控电路型号: | AS1903C31 |
厂家: | AMS(艾迈斯) |
描述: | Ultra Low-Power uP Supervisory Circuit |
文件: | 总9页 (文件大小:76K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
austriamicrosystems
Data Sheet
AS1901, AS1902, AS1903
Ultra Low-Power µP Supervisory Circuit
1 General Description
The AS1901/2/3 family is an ultra low-power supervisory
circuit device.
2 Key Features
Low 230nA (typ) Supply Current
Precision Monitoring of 2.5-, 3-, and 3.3V-Power
Supplies
The device can be used to monitor the supply voltage of
digital systems and microprocessors and initiate a reset
when the voltage goes below a predefined threshold.
The duration of the reset is 5/20/100/500ms (typ.) after
the supply voltage has risen above the threshold.
Supply Voltage Range: 1.0 to 3.6V
Reset Threshold Range: 2.2 to 3.1V
Available in 3 Versions:
The AS1901/2/3 exhibit excellent reliability and can
reduce application costs by eliminating all external com-
ponents.
- AS1901 Push Pull RESETN
- AS1902 Push Pull RESET
- AS1903 Open Drain RESETN
The device is available with different output drivers:
The AS1901 has a push-pull driver with an active low
reset.
4 Time-Out Periods Ranging from 5 to 500ms
Detection Voltage Accuracy: 1.5%
Temperature Range: -40 to +85°C
Package: SOT23-3
The AS1902 uses the same output stage as the
AS1901, but has an active high reset.
The AS1903 has an open drain output with active low
reset.
All devices operate down to a voltage of 1V.
Pin Compatible to MAX6326/6327/6328
The reset thresholds are factory-trimmable between
2.2V and 3.08V in steps of approximately 100mV.
3 Applications
Each device of the AS1901/2/3 family is offered with four
time-out periods of 5/20/100/500ms.
Computers
The extremely low current consumption of only 230nA
(typ) at 3.3V makes the device ideal for use in portable
applications.
Intelligent Instruments
Controllers
All devices are available in a 3-pin SOT23 package.
Critical Microprocessor and Microcontroller
Power Monitoring
Portable/Battery-Powered Equipment
Automotive
Figure 1. Functional Block Diagrams
VCC
VCC
3
3
VDD
VCC
VDD
VCC
AS1901
AS1902
Microprocessor
Microprocessor
AS1903
2
2
RESETN,
RESET
RESET
GND
RESETN
RESET I/O
GND
GND
GND
1
1
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Data Sheet
4 Absolute Maximum Ratings
Stresses beyond those listed in Table 1 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 Section 5 Electrical
Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device
reliability.
(
Table 1. Absolute Maximum Ratings TA = 25°C Unless Otherwise Noted)
Parameter
VDD to GND
Limits
-0.3 to +5
-0.3 to VDD + 0.3
20
Unit
V
Notes
RESET/RESETN to GND
Input Current (VDD)
V
mA
mA
V/µs
°C
Output Current (RESET, RESETN)
Rate of Rise (VDD)
20
100
Operating Temperature Range (TA)
Storage Temperature Range
-40 to +85
-65 to +150
°C
The reflow peak soldering temperature (body
temperature) specified is in accordance with
IPC/JEDEC J-STD-020C “Moisture/Reflow
Sensitivity Classification for non-hermetic
Solid State Surface Mount Devices”
Package-Body Peak Temperature
+260
°C
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Data Sheet
5 Electrical Characteristics
VDD = Full Range; TA = -40 to +85ºC; Unless Otherwise Specified
Table 2. Electrical Characteristics
Parameter
VDD Range
Symbol
VDD
Conditions
TA = 0 to +70°C
Min
1.0
1.2
Typ
Max
3.6
Unit
V
TA = -40 to +85°C
VDD = 3.3V, No Load
3.6
Supply Current (AS1901/2/3)
IDD
230
VTH
430
nA
VTH -
1.5%
VTH +
1.5%
TA = +25°C
1
VTH
V
Reset Threshold Voltage
VTH -
2.5%
VTH +
2.5%
TA = -40 to +85°C
VTH
20
2
tRD
tTP
VDD = VTH to (VTH - 100mV)
50
µs
VDD to Reset Delay
tTP -
40%
tTP +
60%
3
tTP
ms
Reset Active Time-Out Period
RESETN Output Voltage (AS1901/3)
RESETN Output Voltage (AS1901)
ISINK = 1.2mA, VDD = 2.1V, Reset
Asserted
0.4
0.4
V
V
V
V
V
VOL
VOH
VOH
ISINK = 400µA, VDD = 1.2V, Reset
Asserted
0.8 x
VDD
ISOURCE = 1.2mA, VDD = 3.2V
ISOURCE = 500µA, VDD = 2.1V,
Reset Asserted
0.8 x
VDD
ISOURCE = 100µA, VDD = 1.2V,
Reset Asserted
0.8 x
VDD
RESET Output Voltage (AS1902)
RESET Threshold Hysteresis
ISINK = 1.2mA, VDD = 3.2V,
Reset Not Asserted
VOL
VHYST
ILEAK
0.4
0.1
V
10
mV
µA
Open-Drain RESETN Output
Leakage Current (AS1903)
Notes:
1
See Table 5, “Coding of Factory-Trimmed Reset Threshold Voltages,” on page 5.
Guaranteed by design.
2
3
See Table 3, “Coding of Factory-trimmed Reset Active Time-Out Period,” on page 5.
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Interfacing to Microprocessors with Bi-Directional Reset Pins
Data Sheet
6 Operation
6.1 Interfacing to Microprocessors with Bi-Directional Reset Pins
The device has an open drain RESETN output, which enables easy interfacing to microprocessors (µP) with bi-direc-
tional reset pins, such as the Motorola 68HC11. The RESETN pin of the microcontroller (µC) can be connected directly
to the µP supervisor's RESETN output with a single pull-up resistor (see Figure 1 on page 1).
6.2 Operating Characteristics
Supply Current vs. Temperature,
VCC=3.3V
Pow er-Dow n Reset Delay
vs. Temperature, VOD = 10mV
0.5
200
0.4
0.3
150
100
0.2
0.1
0
50
0
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
Temperature (°C)
Temperature (°C)
Maximum Transient Duration
vs. Reset Threshold Overdrive
Power-Up Reset Timeout
vs. Temperature
400
200
300
200
100
0
160
120
80
40
0
1
10
100
1000
-40
-20
0
20
40
60
80
Reset Threshold Overdrive
Vth-Vcc (mV)
Temperature (°C)
6.3 Negative-Going VDD Transients
The device is optimized to ignore short-duration, negative-going VDD transients (glitches) in order to avoid incorrect
resets.
In the graph Maximum Transient Duration vs. Reset Threshold Overdrive (page 4), the conditions are shown, for which
the reset pulses are not generated. In the graph the maximum pulse width that a negative VDD transient may have
when a reset signal is generated. As the amplitude of the transient increases, the maximum allowable pulse width
decreases.
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Data Sheet
7 Options
Table 3. Coding of Factory-trimmed Reset Active Time-Out Period
tTP in Milliseconds
Device
Suffix
Min
3
Typ
5
Max
8
AS190x_xx
AS190x_xx
AS190x_xx
AS190x_xx
A
B
C
D
12
20
32
60
100
500
160
800
300
Table 4. Output Variants
Device
Output Functionality
Active Low (RESETN)
Active High (RESET)
Open Drain (RESETN)
AS1901xxx
AS1902xxx
AS1903xxx
Table 5. Coding of Factory-Trimmed Reset Threshold Voltages
Reset Threshold Voltage, VTH in V
Device
Suffix
TA = +25°C
Typ
TA = -40 to +85°C
Min
Max
Min
Max
AS190xx__
AS190xx__
AS190xx__
AS190xx__
AS190xx__
AS190xx__
AS190xx__
AS190xx__
AS190xx__
AS190xx__
22
23
24
25
26
27
28
29
30
31
2.167
2.285
2.364
2.463
2.591
2.660
2.758
2.886
2.955
3.034
2.2
2.233
2.355
2.436
2.538
2.669
2.741
2.842
2.974
3.045
3.126
2.145
2.262
2.340
2.438
2.564
2.633
2.730
2.857
2.925
3.003
2.255
2.378
2.460
2.563
2.696
2.768
2.870
3.003
3.075
3.157
2.32
2.4
2.5
2.63
2.7
2.8
2.93
3.0
3.08
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Pin Assignments
Data Sheet
8 Pinout and Packaging
8.1 Pin Assignments
Figure 2. Pin Assignments (Top View)
Top View
GND
1
2
AS1901
AS1902
AS1903
3
VDD
RESETN,
RESET
SOT23-3
8.2 Pin Descriptions
Table 6. Pin Descriptions
Pin Number
Pin Name
Description
Ground
AS1901/AS1903
AS1902
1
1
-
GND
Active-low reset output. RESETN remains low while VDD is
below the reset threshold and for tTP after VDD rises above
the reset threshold. RESETN is open-drain on the AS1903
and push-pull on the AS1901.
2
RESETN
Active-high reset output. RESET remains high while VDD is
below the reset threshold and for tTP after VDD rises above
the reset threshold.
-
2
3
RESET
VDD
3
Supply voltage.
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Package Drawings and Markings
Data Sheet
8.3 Package Drawings and Markings
The device is available in a 3-pin SOT-23 package.
Figure 3. 3-Pin SOT-23 Package.
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Data Sheet
9 Ordering Information
The device is available in the following standard versions.
Standard Part
AS1901C23
AS1901C26
AS1901C31
AS1902C23
AS1902C26
AS1902C31
AS1903C23
AS1903C26
AS1903C31
Threshold
Duration
100ms
100ms
100ms
100ms
100ms
100ms
100ms
100ms
100ms
Marking
ASBA
ASBD
ASBI
2.32
2.63
3.08
2.32
2.63
3.08
2.32
2.63
3.08
ASBK
ASBN
ASBS
ASBU
ASBX
ASB3
Non-standard versions require a minimum order of 30,000 units. Contact austriamicrosystems for availability of non-
standard versions.
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Data Sheet
Copyrights
Copyright © 1997-2005, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe.
Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, trans-
lated, 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.
Disclaimer
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. austriami-
crosystems 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.
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 tech-
nical 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.
Contact Information
Headquarters
austriamicrosystems AG
A-8141 Schloss Premstaetten, Austria
Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
e-mail: info@austriamicrosystems.com
For Sales Offices, Distributors and Representatives, please visit:
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