ams AS1905 Ultra low-power p supervisory circuit Datasheet

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The technical content of this austriamicrosystems datasheet is still valid.
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AS1904, AS1905, AS1906
Data Sheet
Wor
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Ultra Low-Power µP Supervisory Circuit
Low
P
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Con wer est
sum
1 General Description
2 Key Features
ptio
n!
The AS1904/5/6 family is an ultra low-power supervisory
Low 150nA (typical) Supply Current
!
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.
!
Precision Monitoring of 2.5-, 3-, and 3.3V-Power
Supplies
!
Supply Voltage Range 1.0 to 3.6V
!
Reset Threshold Available from 2.2 to 3.1V
!
Available in three Versions
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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
The AS1904 has a push-pull driver with an active low
reset.
!
The AS1905 uses the same output stage as the
AS1904, but has an active high reset.
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!
!
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circuit device.
The AS1906 has an open drain output with active low
reset.
All devices operate down to a voltage of 1V.
!
4 Time-Out Periods Ranging from 5 to 500ms
!
Detection Voltage Accuracy: ±1.5%
!
Temperature Range: -40 to +85°C
!
SOT23-3 Package
!
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.
The extremely low current consumption of only 150nA
(typ) at 3.3V makes the device ideal for use in portable
applications.
3 Applications
The devices are ideal for computers, intelligent instruments, controllers, critical microprocessor and microcontroller, power monitoring and portable/batterypowered equipment.
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All devices are available in a 3-pin SOT23 package.
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Figure 1. Functional Block Diagrams
VCC
3
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VDD
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AS1904
AS1905
RESET,
RESETN
VCC
VDD
Microprocessor
2
GND
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AS1906
RESET
RESETN
GND
GND
1
VCC
Microprocessor
2
RESET I/O
GND
1
Revision 1.41
1-9
AS1904, AS1905, AS1906
Data Sheet - P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
1
AS1904
AS1905
AS1906
RESETN,
RESET
VDD
2
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SOT23-3
Pin Descriptions
3
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GND
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Top View
Table 1. Pin Descriptions
Pin Number
AS1904/AS1906
1
2
-
Description
1
GND
Ground
-
RESETN
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
RESET
Active-high reset output. RESET remains high while VDD is
below the reset threshold and for tTP after VDD rises above
the reset threshold.
3
VDD
Supply voltage.
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3
Pin Name
AS1905
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Revision 1.41
2-9
AS1904, AS1905, AS1906
Data Sheet - 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 the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
Limits
Units
VDD to GND
-0.3 to +5
V
RESET/RESETN to GND
-0.3 to VDD + 0.3
V
Input Current (VDD)
20
mA
Output Current (RESET, RESETN)
20
mA
100
V/µs
-40 to +85
°C
Storage Temperature Range
-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”
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Rate of Rise (VDD)
Operating Temperature Range (TA)
Notes
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Parameter
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Table 2. Absolute Maximum Ratings (TA = 25°C Unless Otherwise Noted)
+260
°C
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Package-Body Peak Temperature
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Revision 1.41
3-9
AS1904, AS1905, AS1906
Data Sheet - 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
VDD = Full Range; TA = -40º to +85°C; Unless Otherwise Specified
Table 3. Electrical Characteristics
VDD Range
VDD
Supply Current
IDD
RESET Threshold
Voltage1
Conditions
Min
TA = 0 to +70°C
1.0
TA = -40 to +85°C
1.2
VDD = 3.3V, No Load
RESET Active Time-Out Period3
tTP
Unit
3.6
V
3.6
150
RESETN Output Voltage
(AS1904/AS1906)
VOL
RESETN Output Voltage (AS1904)
VOH
VOH
RESET Output Voltage (AS1905)
VOL
RESET Threshold Hysteresis
VHYST
Open-Drain RESETN Output
Leakage Current (AS1906)
ILEAK
Notes:
V
290
nA
VTH 1.5%
VTH
VTH +
1.5%
V
TA = -40 to +85°C
VTH 2.5%
VTH
VTH +
2.5%
V
20
50
µs
tTP +
60%
ms
0.4
V
0.4
V
VDD = VTH to (VTH - 100mV)
tTP 40%
ISINK = 1.2mA, VDD = 2.1V,
reset asserted
tTP
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tRD
Max
TA = +25°C
VTH
VDD to Reset Delay2
Typ
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Symbol
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Parameter
ISINK = 400µA, VDD = 1.2V,
reset asserted
ISOURCE = 1.2mA, VDD = 3.2V
0.8 x
VDD
V
ISOURCE = 500µA, VDD = 2.1V,
reset asserted
0.8 x
VDD
V
ISOURCE = 100µA, VDD = 1.2V,
reset asserted
0.8 x
VDD
V
ISINK = 1.2mA, VDD = 3.2V,
reset not asserted
0.4
10
0.1
See Table 6, “Coding of Factory-Trimmed Reset Threshold Voltages,” on page 6.
2
Guaranteed by design.
3
See Table 4, “Coding of Factory-trimmed Reset Active Time-Out Period,” on page 6.
mV
µA
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1
V
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Revision 1.41
4-9
AS1904, AS1905, AS1906
Data Sheet - 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
Figure 3. Supply Current vs. Temperature
Figure 4. Power Down Reset Delay vs. Temp.
0.5
200
VOD = 10mV
0.2
0.1
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0.3
150
125
100
75
50
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0.4
Reset Delay (µs)
Supply Current (mA)
.
175
25
-15
0
-40
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-40
10
35
60
85
Temperature(°C)
Max. Transient Duration (µs)
150
125
100
75
50
25
0
-40
-15
10
35
60
85
60
300
275
250
225
200
175
150
125
100
75
50
25
0
1
85
10
100
1000
Reset Th. Overdrive VTH-VCC (mV)
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Temperature(°C)
Overdrive
35
Figure 6. Max. Trans. Duration vs. Reset Th.
.
.
Power-Up Reset Timeout (ms)
175
10
Temperature(°C)
Figure 5. Power-Up Reset Timeout vs. Temperature
200
-15
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Revision 1.41
5-9
AS1904, AS1905, AS1906
Data Sheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
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-directional 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).
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Negative-Going VDD Transients
The device is optimized to ignore short-duration, negative-going VDD transients (glitches) in order to avoid incorrect
resets.
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In the graph Maximum Transient Duration vs. Reset Threshold Overdrive (page 6) , 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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Options
Table 4. Coding of Factory-trimmed Reset Active Time-Out Period
Device
tTP in Milliseconds
Suffix
Min
Typ
Max
AS190x_xx
A
3
5
8
AS190x_xx
B
12
20
32
AS190x_xx
C
60
100
160
AS190x_xx
D
300
500
800
Table 5. Output Variants
Device
AS1904xxx
AS1905xxx
AS1906xxx
Output Functionality
Active Low (RESETN)
Active High (RESET)
Open Drain (RESETN)
Table 6. Coding of Factory-Trimmed Reset Threshold Voltages
Reset Threshold Voltage, VTH in V
Suffix
AS190xx__
TA = -40 to +85°C
Min
Typ
Max
Min
Max
22
2.167
2.2
2.233
2.145
2.255
23
2.285
2.32
2.355
2.262
2.378
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AS190xx__
TA = +25°C
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Device
24
2.364
2.4
2.436
2.340
2.460
AS190xx__
25
2.463
2.5
2.538
2.438
2.563
AS190xx__
26
2.591
2.63
2.669
2.564
2.696
AS190xx__
27
2.660
2.7
2.741
2.633
2.768
AS190xx__
28
2.758
2.8
2.842
2.730
2.870
AS190xx__
29
2.886
2.93
2.974
2.857
3.003
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AS190xx__
AS190xx__
30
2.955
3.0
3.045
2.925
3.075
AS190xx__
31
3.034
3.08
3.126
3.003
3.157
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Revision 1.41
6-9
AS1904, AS1905, AS1906
Data Sheet - 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
9 Package Drawings and Markings
The device is available in a 3-pin SOT-23 package.
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Figure 7. 3-Pin SOT-23 Package.
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Revision 1.41
7-9
AS1904, AS1905, AS1906
Data Sheet - O r d e r i n g I n f o r m a t i o n
10 Ordering Information
The device is available in the following standard versions.
Standard Part
Threshold (V)
Duration (mS)
Marking
2.32
100
ASGI
AS1904C26
2.63
100
ASDB
AS1904C31
3.08
100
ASDG
AS1905C23
2.32
100
AS1905C26
2.63
100
AS1905C31
3.08
100
AS1906C23
2.32
100
AS1906C26
2.63
100
100
3.08
100
ASDQ
ASDS
ASDV
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2.8
AS1906C31
ASDI
ASDL
ASDX
ASGK
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AS1906C28
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AS1904C23
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Non-standard versions require a minimum order of 30,000 units. Contact austriamicrosystems for availability of nonstandard versions.
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Revision 1.41
8-9
AS1904, AS1905, AS1906
Data Sheet
Copyrights
Copyright © 1997-2007, austriamicrosystems AG, Schloss Premstaetten, 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 lifesustaining 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.
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Contact Information
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Headquarters
austriamicrosystems AG
A-8141 Schloss Premstaetten, Austria
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
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Revision 1.41
9-9