AS1904C31 [AMSCO]
Ultra Low-Power uP Supervisory Circuit; 超低功耗高达监控电路型号: | AS1904C31 |
厂家: | AMS(艾迈斯) |
描述: | Ultra Low-Power uP Supervisory Circuit |
文件: | 总9页 (文件大小:88K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
austriamicrosystems
Data Sheet
AS1904, AS1905, AS1906
Ultra Low-Power µP Supervisory Circuit
1 General Description
The AS1904/5/6 family is an ultra low-power supervisory
circuit device.
2 Key Features
Low 150nA (typical) 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 Available from 2.2 to 3.1V
Available in three Versions
The device exhibits excellent reliability and can reduce
application costs by eliminating all external components.
- AS1904 Push-Pull RESETN
- AS1905 Push-Pull RESET
The device is available with different output drivers:
- AS1906 Open Drain RESETN
4 Time-Out Periods Ranging from 5 to 500ms
The AS1904 has a push-pull driver with an active low
reset.
Detection Voltage Accuracy: 1.5%
The AS1905 uses the same output stage as the
AS1904, but has an active high reset.
Temperature Range: -40 to +85°C
SOT23-3 Package
The AS1906 has an open drain output with active low
reset.
Pin Compatible to MAX6326/6327/6328
All devices operate down to a voltage of 1V.
Superior Upgrade to austriamicrosystems
AS1901/2/3 Device Family
The reset thresholds are factory-trimmable between
2.2V and 3.08V in steps of approximately 100mV.
Each device of the AS1904/5/6 family is offered with four
time-out periods of 5/20/100/500ms.
3 Applications
The extremely low current consumption of only 150nA
(typ) at 3.3V makes the device ideal for use in portable
applications.
Computers
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
AS1904
AS1905
AS1906
Microprocessor
Microprocessor
2
2
RESET,
RESETN
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 the operational sec-
tions of the specifications 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
Units
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 = -40º to +85°C; 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
V
Supply Current
IDD
150
VTH
290
nA
VTH -
1.5%
VTH +
1.5%
TA = +25°C
V
1
VTH
RESET Threshold Voltage
VTH -
2.5%
VTH +
2.5%
TA = -40 to +85°C
VTH
20
V
2
tRD
tTP
VDD = VTH to (VTH - 100mV)
50
µs
ms
VDD to Reset Delay
tTP -
40%
tTP +
60%
3
tTP
RESET Active Time-Out Period
ISINK = 1.2mA, VDD = 2.1V,
reset asserted
0.4
0.4
V
V
V
V
V
RESETN Output Voltage
(AS1904/AS1906)
VOL
VOH
VOH
ISINK = 400µA, VDD = 1.2V,
reset asserted
0.8 x
VDD
RESETN Output Voltage (AS1904)
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 (AS1905)
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 (AS1906)
Notes:
1
2
3
See Table 5, “Coding of Factory-Trimmed Reset Threshold Voltages,” on page 5.
Guaranteed by design.
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-Down Reset Delay
vs. Temperature VOD = 10mV
0.5
0.4
0.3
0.2
0.1
0
200
150
100
50
0
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
Temperature (°C)
Temperature (°C)
Power-Up Reset Timeout
vs. Temperature
Maximum Transient Duration
vs. Reset Threshold Overdrive
200
400
160
120
80
300
200
100
0
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)
AS1904xxx
AS1905xxx
AS1906xxx
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
1
2
GND
AS1904
AS1905
AS1906
VDD
3
RESETN,
RESET
SOT23-3
8.2 Pin Descriptions
Table 6. Pin Descriptions
Pin Number
Pin Name
Description
Ground
AS1904/AS1906
AS1905
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 AS1906
and push-pull on the AS1904.
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
AS1904C23
AS1904C26
AS1904C31
AS1905C23
AS1905C26
AS1905C31
AS1906C23
AS1906C26
AS1906C28
AS1906C31
Threshold (V)
Duration (mS)
Marking
ASGI
2.32
2.63
3.08
2.32
2.63
3.08
2.32
2.63
2.8
100
100
100
100
100
100
100
100
100
100
ASDB
ASDG
ASDI
ASDL
ASDQ
ASDS
ASDV
ASDX
ASGK
3.08
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:
http://www.austriamicrosystems.com
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