ALSC ASM1834DSF-T

ASM1834/A/D
April 2005
rev 1.3
Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset
General Description
All devices operate over the extended industrial temperature
The ASM1834 supervisors simultaneously monitor both 3.3V
and 5V power sources and generate reset signals when either
supply is out of tolerance. When an out-of-tolerance condition is
range. Devices are available in 8-pin DIP, surface mount 8-pin
SO and 8-Pin MicroSO packages. Die are also available.
detected, the output-reset signal of the affected supply
Key Features
becomes active and resets the system microprocessor/
•
Monitors 5V and 3.3V supplies simultaneously
microcontroller. On power-up and after the supply voltage
•
5V and 3.3V power-on reset
returns to an in-tolerance condition, the reset signal remains
•
350ms reset time
active for approximately 350ms. This allows the power supply
•
Debounced pushbutton reset input
and system microprocessor to stabilize.
•
Push-pull CMOS output
• ASM1834, ASM1834D
• Eliminates external pull-up resistors
Tolerance levels are independently selectable for both supplies.
• Active LOW (ASM1834), HIGH (ASM1834D)
Tolerance options are 5% and 10% percent for the 5V supply
and 10% and 20% percent for the 3.3V supply.
•
Open Drain Output
• ASM1834A
• Active LOW
The ASM1834 and ASM1834D have push-pull reset output
stages. The ASM1834A reset outputs are open drain devices
•
Selectable 5V and 3.3V trip point tolerance
that can both be connected to either 5V or 3.3V supply. The
•
Internal power drawn from highest input voltage, 5V or
ASM1834D has active HIGH reset outputs.
•
Precision temperature-compensated voltage reference and
All devices can generate reset signals through an internally
•
Low cost surface mount SO, compact MicroSO and DIP
•
Wide operating temperature, -40°C to +85°C
3.3V
ASM1834 and ASM1834A have active LOW reset outputs. The
comparator
packages.
debounced pushbutton reset input that affects both reset
outputs.
Applications
Typical Operating Circuit
•
Microprocessors
•
PDAs, Hand-held PCs
•
Embedded Controllers
•
Telecommunication Systems
•
Power Supplies
•
Wireless / Cellular Systems
•
Networking Hardware
3.3V
+5V
ASM1834
5V
3.3V
µP
5VIN
3.3VIN
RESET
RESET
PBRST
5VTOL GND 3.3VTOL
GND
Alliance Semiconductor
2575 Augustine Drive . Santa Clara, CA 95054 . Tel: 408.855.4900 . Fax: 408.855.4999 . www.alsc.com
Notice: The information in this document is subject to change without notice
ASM1834/A/D
April 2005
rev 1.3
Block Diagram
ASM1834A
ASM1834
1
5 VIN
2
5V RESET
3
5 VTOL
5V Tolerance
Bias
+
For ASM1834D
350ms Delay
Low TC
Reference
2 5V RESET
-
5V RESET
(ASM1834D)
7
3.3V RESET
40kΩ
PBRST
3.3 VIN
5
Pushbutton Level
Sense and Debounce
8
3.3 VTOL 6
GND
3.3V Tolerance
Bias
For ASM1834D
+
350ms Delay
7
3.3V RESET
3.3V RESET (ASM1834D)
-
4
Pin Configuration
5VIN
8
1
5V RESET *
2
5V TOL
3
GND
4
ASM1834
ASM1834A
ASM1834D
7
3.3VIN
3.3V RESET *
6
3.3V TOL
5
PBRST
* AS1834D reset outputs are active HIGH (5V RESET and 3.3V RESET)
Outputs are open-drain for AS1834A.
Pin Description
Pin #
Pin Name
1
5VIN
2
5V RESET
5V RESET
3
5V TOL
4
GND
5
PBRST
6
3.3V TOL
7
3.3V RESET
3.3V RESET
8
3.3VIN
Function
5V power supply input.
5V reset output (Active LOW, ASM1834, ASM1834A. Open drain outputs for ASM1834A).
5V reset output (Active HIGH, AS1834D).
5V input tolerance select: 10% tolerance for 5VTOL= 5VIN and 5% tolerance for 5VTOL = GND
Ground.
Debounced manual pushbutton reset input (40kΩ internal pull-up).
3.3V input tolerance select: 20% tolerance for 3.3VTOL = 3.3VIN and 10% tolerance for 3.3VTOL=GND.
3.3V reset output (Active LOW, ASM1834, ASM1834A. Open drain outputs for ASM1834A).
3.3V reset output (Active HIGH, AS1834D).
3.3V power supply input.
Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
2 of 10
ASM1834/A/D
April 2005
rev 1.3
Detailed Description
tF
VIN
Operation Power Monitor
VINTP (MAX)
The ASM1834 supervisors simultaneously detect out-of-
VINTP
VINTP (MIN)
tolerance power supply conditions on both 3.3V and 5V
the tolerance band, the reset for the falling supply voltage
~~
power supplies. If the voltages at 5VIN or 3.3VIN are outside
RESET
tRPD
becomes active. When the monitored supply returns to an in-
RESET
approximately 350ms after the power supply voltages have
reached the selected tolerance. This allows the power supply
and microprocessor to stabilize before the reset is removed.
All supply current for the ASM1834 devices is drawn from the
input (5VIN or 3.3VIN) with the highest voltage level. The
outputs draw current from their input supplies 5VIN and
3.3VIN.
~
~~
VOL
350ms before returning to the inactive state.
On power-up, the reset signals are kept active for
RESET Slews
with VCC
VOH
tolerance state, the reset remains active for approximately
Figure 2: Timing Diagram: Power Down (ASM1834D only)
Reset Signal Polarity and Output Stage Structure
The ASM1834 and the ASM1834A supervisors have active
LOW reset signals. The ASM1834D reset outputs are active
HIGH.
The ASM1834 and the ASM1834D have CMOS push-pull
output stages. The ASM1834A has open drain reset outputs.
tR
VINTP(MAX)
VINTP(MIN)
~~
RESET
Polarity
Output Stage
Configuration
ASM1834
LOW
Push-Pull
ASM1834U
LOW
Push-Pull
ASM1834S
LOW
Push-Pull
ASM1834A
LOW
Open Drain
ASM1834AU
LOW
Open Drain
ASM1834AS
LOW
Open Drain
ASM1834D
HIGH
Push-Pull
ASM1834DU
HIGH
Push-Pull
ASM1834DS
HIGH
Push-Pull
VINTP
tRPU
VIN
RESET
VOH
~
~~~
Part #
VOL
RESET
Figure 1: Timing Diagram: Power Up (ASM1834D only)
Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
3 of 10
ASM1834/A/D
April 2005
rev 1.3
Manual Reset Operation
Reset Output Signal
Push-button switch input, PBRST, allows the user to override
Reset output signals are valid as long as either voltage at
the internal trip point detection circuits and issue reset
5VIN or 3.3VIN is above 1.2V. In addition, the ASM1834 has
signals. The pushbutton input is debounced and is pulled
push-pull outputs that can remain valid below a 1.2V input
HIGH through an internal 40kΩ resistor.
level. To sink current below 1.2V, a resistor should be
When at least one of the reset outputs is not asserted, a push
guarantees a valid reset signal down to 0V. A 100kΩ value is
button initiated reset signal can be issued by holding PBRST
suggested.
connected from the RESET output to ground. This resistor
LOW for at least 2ms. When PBRST is held LOW, both resets
become active and remain active for approximately 350ms
The AS1834A open drain reset outputs require pull-up
after PBRST returns HIGH. (See figures 3 and 4).
resistors and must be low enough in value to pull the output
into a HIGH state. Resistor value is not critical in most
applications and a value of 10kΩ is suggested. (See Figures
5 and 6).
3.3V
5V
ASM1834
The ASM1834A open drain reset outputs can be connected
3.3VIN 8
to the same potential through a single pull-up resistor. In this
2 5V RESET 3.3V RESET 7
LOW reset. If the inputs are pulled-up to different voltages,
3
the reset outputs (pin 2 and pin 7) cannot be connected to
1 5VIN
4
5VTOL
3.3VTOL
GND
PBRST
configuration a failure on either supply will generate an active
6
form a wired “AND” (see figure 7).
5
µP
Input
RESET
Figure 3: Pushbutton Reset
100kΩ
tPB
PBRST
Figure 5: ASM1834 RESET Valid to 0V
VIH
tPDLY
VIL
~
RESET
ASM1834
tRST
~~
RESET
3.3V
5V
VOH
VOL
10kΩ
1 5VIN
10kΩ
2 5V RESET 3.3V RESET 7
3
Figure 4: Timing Diagram: Pushbutton Reset
3.3VIN 8
4
5VTOL
GND
3.3VTOL
PBRST
6
5
Figure 6: ASM1834A Open Drain Output Pull-Up Resistor
Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
4 of 10
ASM1834/A/D
April 2005
rev 1.3
5V
3.3V
5V or 3.3V
10kΩ
ASM1834A
1
2
5VIN
3.3VIN
5VRESET 3.3VRESET
3
8
7
6
3.3V TOL
5V TOL
4
GND
PBRST
5
Figure 7: ASM1834A Wired “OR” Connection
Trip Point Tolerance Selection
If 3.3VTOL is connected to the 3.3V supply input, a 20%
The 3.3VTOL and 5VTOL inputs allow independent selection of
tolerance is selected. If 3.3VTOL is grounded, a 10% tolerance
the reset trip points. If 5VTOL is connected to the 5V supply
is selected. (Refer table below). The 3.3VTOL and 5VTOL
input, a 10% tolerance is selected. If 5VTOL is grounded, a 5%
tolerance select inputs should be tied to the ground or to the
tolerance is selected.
respective input supply voltage pin, 3.3VIN or 5VIN.
3.3V Input
Tolerance Select
3.3V
Tolerance
5V Input
TRIP Point (V)
MIN
NOM
MAX
5V
Tolerance
TRIP Point (V)
MIN
NOM
MAX
5VTOL = 5VIN
-
-
-
-
10%
4.25
4.38
4.49
5VTOL = GND
-
-
-
-
5%
4.5
4.63
4.75
3.3VTOL = 3.3VIN
20%
2.47
2.55
2.64
-
-
-
-
3.3VTOL = GND
10%
2.80
2.88
2.97
-
-
-
-
Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
5 of 10
ASM1834/A/D
April 2005
rev 1.3
Absolute Maximum Ratings
Parameter
Min
Max
Unit
Voltage on VCC
-0.5
7
V
Voltage on 5V RESET
-0.5
+5VIN + 0.5V
V
Voltage on 3.3V RESET
-0.5
+3.3VIN + 0.5V
V
Voltage on PBRST and reset outputs
-0.5
whichever is greater
V
Operating Temperature Range
-40
+85
°C
-
260
°C
-55
+125
°C
2
200
KV
V
(+5VIN + 0.5V) or (+3.3VIN + 0.5V)
Soldering Temperature (for 10 sec)
Storage Temperature
ESD rating
HBM
MM
Note:
1. Voltages are measured with respect to ground
2. These are stress ratings only and functional implication is not implied. Exposure to absolute maximum
ratings for extended periods may affect device reliability.
Recommended DC Operating Conditions
Recommended DC operating condition over the operating temperature range of -40°C to +85°C. All voltages are referenced to
ground.
Parameter
Symbol
5V Supply Voltage
5VIN
3.3V Supply Voltage
3.3VIN
PBRST Input High Level
VIH
PBRST Input High Level
VIH
PBRST Input Low Level
VIL
Conditions
Min
Typ
Max
Unit
1.2
5.5
V
1.2
5.5
V
Both 3.3VIN and 5VIN >=2.7V
2
VINMAX + 0.3
V
Both 3.3VIN and 5VIN <=2.7V
VINMAX - 0.4
-0.3
V
0.5
Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
V
6 of 10
ASM1834/A/D
April 2005
rev 1.3
DC Electrical Characteristics
Unless otherwise noted, VIN = 1.2V to 5.5V and specifications are over the operating temperature range of -40°C to 85°C.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Output = 2.4V. Either 3.3VIN or 5.5VIN
Output Current
IOH
Output Current
IOL
Output Voltage
VOH
Input Leakage
IIL
5V Operating Current
ICC
3.3V Operating Current
ICC
350
>=2.7V
(ASM1834/1834D only)
µA
Output = 0.4V. Either 3.3VIN or 5.5VIN
>=2.7V
(ASM1834/1834D only)
10
mA
VIN - 0.1V
-1.0
3.3VIN and 5VIN<=5.5V, RESET
outputs open.
3.3VIN and 5VIN<=3.6V, RESET
outputs open.
V
+1.0
µA
16
30
µA
12
25
µA
5V Trip Point
VINTP
5VTOL = GND
4.50
4.63
4.75
V
5V Trip Point
VINTP
5VTOL = 5VIN
4.25
4.38
4.49
V
3.3V Trip Point
VINTP
3.3VTOL = GND
2.80
2.88
2.97
V
3.3V Trip Point
VINTP
3.3VTOL = 3.3VIN
2.47
2.55
2.64
V
Output Capacitance
COUT
10
pF
PBRST Manual Reset
Minimum Low Time
tPB
PBRST Stable LOW to
reset Active
tPDLY
Reset Active Time
tRST
2
200
ms
350
2
ms
500
ms
VCC Slew Rate
tF
VINTP(MAX) to VINTP(MIN)
300
µs
VCC Slew Rate
tR
VINTP(MIN) to VINTP(MAX)
0
ns
VCC Detect to RESET
or RESET
VCC Detect Noise
Immunity
tRPU
trise = 5µs
200
350
tRPD
500
ms
2
µs
Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
7 of 10
ASM1834/A/D
April 2005
rev 1.3
Package Information
MicroSO (8-Pin)
Dimensions
Symbol
Inches
A
A1
A2
b
C
D
e
E1
E
L
a
S
Min
Max
0.032
0.044
0.002
0.006
0.030
0.038
0.012 BSC
0.004
0.008
0.114
0.122
0.0256 BSC
0.114
0.122
0.184
0.200
0.016
0.026
0°
6°
0.0206 BSC
Symbol
Inches
Millimeters
Min
Max
0.81
1.10
0.05
0.15
0.76
0.97
0.30 BSC
0.10
0.20
2.90
3.10
0.65 BSC
2.90
3.10
4.67
5.08
0.41
0.66
0°
6°
0.52 BSC
Dimensions
SO (8-PIN)
A1
H
E
D
Max
Min
Max
0.004
0.010
0.10
0.25
A
0.053
0.069
1.35
1.75
A2
0.049
0.059
1.25
1.50
B
0.012
0.020
0.31
0.51
C
0.007
0.010
0.18
0.25
D
0.193 BSC
E
0.154 BSC
3.91 BSC
e
0.050 BSC
1.27 BSC
H
A2
A
C
e
A1
D
θ
Millimeters
Min
4.90 BSC
0.236 BSC
6.00 BSC
L
0.016
0.050
0.41
1.27
θ
0°
8°
0°
8°
L
B
PLASTIC DIP (8-PIN)
Dimensions
Symbol
Inches
Millimeters
Min
Max
Min
Max
A
….
0.210
…..
5.33
A1
0.015
…..
0.38
…..
A2
0.115
0.195
2.92
4.95
b
0.014
0.022
0.36
0.56
b2
0.045
0.070
1.14
1.78
C
0.008
0.014
0.20
0.36
D
0.355
0.400
9.02
10.16
8.26
E
0.300
0.325
7.62
E1
0.240
0.280
6.10
e
0.10 BSC
7.11
2.54 BSC
eB
…..
0.430
…..
10.92
L
0.115
0.150
2.92
3.81
Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
8 of 10
ASM1834/A/D
April 2005
rev 1.3
Ordering Information
Reset
Polarity
Operating
Temperature Range
Output Stage
Package
Package
Marking
ASM1834
LOW
-40°C TO 85°C
Push-Pull
8-DIP
ASM1834
ASM1834U
LOW
-40°C TO 85°C
Push-Pull
MicroSO
ASM1834U
ASM1834S
LOW
-40°C TO 85°C
Push-Pull
8-SO
ASM1834S
ASM1834A
LOW
-40°C TO 85°C
Open Drain
8-DIP
ASM1834A
ASM1834AU
LOW
-40°C TO 85°C
Open Drain
MicroSO
ASM1834AU
ASM1834AS
LOW
-40°C TO 85°C
Open Drain
8-SO
ASM1834AS
ASM1834D
HIGH
-40°C TO 85°C
Push-Pull
8-DIP
ASM1834D
ASM1834DU
HIGH
-40°C TO 85°C
Push-Pull
MicroSO
ASM1834DU
ASM1834DS
HIGH
-40°C TO 85°C
Push-Pull
8-SO
ASM1834DS
ASM1834F
LOW
-40°C TO 85°C
Push-Pull
8-DIP
ASM1834F
ASM1834UF
LOW
-40°C TO 85°C
Push-Pull
MicroSO
ASM1834UF
ASM1834SF
LOW
-40°C TO 85°C
Push-Pull
8-SO
ASM1834SF
ASM1834AF
LOW
-40°C TO 85°C
Open Drain
8-DIP
ASM1834AF
ASM1834AUF
LOW
-40°C TO 85°C
Open Drain
MicroSO
ASM1834AUF
ASM1834ASF
LOW
-40°C TO 85°C
Open Drain
8-SO
ASM1834ASF
ASM1834DF
HIGH
-40°C TO 85°C
Push-Pull
8-DIP
ASM1834DF
ASM1834DUF
HIGH
-40°C TO 85°C
Push-Pull
MicroSO
ASM1834DUF
ASM1834DSF
HIGH
-40°C TO 85°C
Push-Pull
8-SO
ASM1834DSF
Part Number
TIN - LEAD DEVICES
LEAD FREE DEVICES
Note:
For parts to be packed in Tape and Reel, add “-T” at the end of the part number.
Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
9 of 10
ASM1834/A/D
Alliance Semiconductor Corporation
2575, Augustine Drive,
Santa Clara, CA 95054
Tel: 408 - 855 - 4900
Fax: 408 - 855 - 4999
www.alsc.com
Copyright © Alliance Semiconductor
All Rights Reserved
Part Number: ASM1834/A/D
Document Version: 1.3
© Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are trademarks or
registered trademarks of Alliance. All other brand and product names may be the trademarks of their respective companies. Alliance reserves the
right to make changes to this document and its products at any time without notice. Alliance assumes no responsibility for any errors that may
appear in this document. The data contained herein represents Alliance's best data and/or estimates at the time of issuance. Alliance reserves the
right to change or correct this data at any time, without notice. If the product described herein is under development, significant changes to these
specifications are possible. The information in this product data sheet is intended to be general descriptive information for potential customers and
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or liability arising out of the application or use of any product described herein, and disclaims any express or implied warranties related to the sale
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