ASM1834D/D [PULSECORE]
Power Supply Support Circuit, Fixed, 2 Channel,;
| 型号： | ASM1834D/D |
| 厂家： | 
PulseCore Semiconductor |
| 描述： | Power Supply Support Circuit, Fixed, 2 Channel, |
| 文件： | 总10页 (文件大小：260K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
October 2003
ASM1834A/D
rev 1.0
Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset
All devices operate over the extended industrial temperature
range. Devices are available in 8-pin DIP, surface mount 8-pin
SO and 8-Pin MicroSO packages. Die are also available.
General Description
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 is
detected, the output-reset signal of the affected supply
becomes active and resets the system microprocessor/
microcontroller. On power-up and after the supply voltage
returns to an in-tolerance condition, the reset signal remains
active for approximately 350ms. this allows the power supply
and system microprocessor to stabilize.
Key Features
•
•
•
•
•
Monitor 5V and 3.3V supplies simultaneously
5V and 3.3V power-on reset
350ms reset time
Debounced pushbutton reset input
Push-pull CMOS output
•ASM1834, ASM1834D
•Eliminates external pull-up resistors
•Active LOW (ASM1834), HIGH (ASM1834D)
Open Drain Output
Tolerance levels are independently selectable for both supplies.
Tolerance options are 5% and 10% percent for the 5V supply
and 10% and 20% percent for the 3.3V supply.
•
•ASM1834A
•Active LOW
The ASM1834 and ASM1834D have push-pull reset output
stages. The ASM1834A reset outputs are open drain devices
that can both be connected to either 5V or 3.3V supply. The
ASM1834 and ASM1834A have active LOW reset outputs. The
ASM1834D has active HIGH reset outputs.
•
•
Selectable 5V and 3.3V trip point tolerance
Internal power drawn from highest input voltage, 5V or
3.3V
•
•
•
Precision temperature-compensated voltage reference and
comparator
Low cost surface mount SO, compact MicroSO and DIP
packages.
All devices can generate reset signals through an internally
debounced pushbutton reset input that affects both reset
outputs.
Wide operating temperature, -40°C to +85°C
Applications
Typical Operating Circuit
•
•
•
•
•
•
•
Microprocessors
PDAs, Hand-held PCs
Embedded Controllers
Telecommunication Systems
Power Supplies
3.3V
+5V
5V
3.3V
ASM1834
µP
Wireless / Cellular Systems
Networking Hardware
5V
3.3V
IN
IN
RESET
RESET
PBRST
GND
GND
5VTOL
3.3VTOL
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
October 2003
ASM1834A/D
rev 1.0
Block Diagram
ASM1834A
ASM1834
5 VIN
5V RESET
For ASM1834D
5V Tolerance
Bias
+
5 VTOL
5V RESET
5V RESET
350ms Delay
Low TC
-
(ASM1834D)
3.3V RESET
Reference
40kΩ
Pushbutton Level
Sense and Debounce
PBRST
3.3 VIN
For ASM1834D
3.3 VTOL
GND
3.3V Tolerance
Bias
+
3.3V RESET
350ms Delay
3.3V RESET (ASM1834D)
-
Pin Configuration
1
8
3.3VIN
5VIN
ASM1834
ASM1834A
ASM1834D
7
6
5
2
3
3.3V RESET *
5V RESET *
5V TOL
3.3V TOL
PBRST
4
GND
* AS1834D reset outputs are active HIGH (5V RESET and 3.3V RESET)
Outputs are open-drain for AS1834A.
Pin Description
Pin #
Pin Name
Function
5VIN
1
5V power supply input.
5V RESET
5V RESET
5V reset output (Active LOW, ASM1834, ASM1834A. Open drain outputs for ASM1834A).
5V reset output (Active HIGH, AS1834D).
2
5V input tolerance select: 10% tolerance for 5VTOL= 5VIN and 5% tolerance for 5VTOL = GND
3
4
5
6
5V TOL
GND
Ground.
PBRST
3.3V TOL
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 3.3V reset output (Active LOW, ASM1834, ASM1834A. Open drain outputs for ASM1834A).
3.3V RESET 3.3V reset output (Active HIGH, AS1834D).
7
8
3.3VIN
3.3V power supply input.
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Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
October 2003
ASM1834A/D
rev 1.0
Detailed Description
t
F
V
IN
Operation Power Monitor
V
(MAX)
V
INTP
The ASM1834 supervisors simultaneously detect out-of-
tolerance power supply conditions on both 3.3V and 5V
power supplies. If the voltages at 5VIN or 3.3VIN are outside
the tolerance band, the reset for the falling supply voltage
becomes active. When the monitored supply returns to an in-
tolerance state, the reset remains active for approximately
350ms before returning to the inactive state.
INTP
V
(MIN)
INTP
RESET
t
RPD
RESET Slews
withV
V
CC
OH
V
OL
RESET
On power-up, the reset signals are kept active for
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.
Figure 2: Timing Diagram : Power Down
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.
All supply current for the ASM1834 devices is drawn from the
input (5VIN or 3.3VIN) with the highest voltage level. The
The ASM1834 and the ASM1834D have CMOS push-pull
output satges. The ASM1834A has open drain reset outputs.
outputs draw current from their input supplies 5VIN and
3.3VIN.
t
R
RESET
Polarity
Output Stage
Configuration
Part #
V
(MAX)
INTP
V
INTP
V
(MIN)
INTP
ASM1834
ASM1834EMA
ASM1834S
LOW
LOW
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
Push-Pull
Push-Pull
Push-Pull
Open Drain
Open Drain
Open Drain
Push-Pull
Push-Pull
Push-Pull
t
RPU
V
IN
RESET
RESET
V
OH
ASM1834A
V
OL
ASM1834AEMA
ASM1834AS
ASM1834D
Figure 1: Timing Diagram : Power Up
ASM1834DEMA
ASM1834DS
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Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
October 2003
ASM1834A/D
rev 1.0
Manual Reset Operation
Reset Output Signal
Push-button switch input, PBRST, allows the user to override
the internal trip point detection circuits and issue reset
signals. The pushbutton input is debounced and is pulled
HIGH through an internal 40kΩ resistor.
Reset output signals are valid as long as either voltage at
5VIN or 3.3VIN is above 1.2V. In addition, the ASM1834 has
push-pull outputs that can remain valid below a 1.2V input
level. To sink current below 1.2V, a resistor should be
connected from the reset output to ground. This resistor
guarantees a valid reset signal down to 0V. A 100kΩ value is
suggested.
When at least one of the reset outputs is not asserted, a push
button initiated reset signal can be issued by holding PBRST
LOW for at least 2ms. When PBRST is held LOW, both resets
become active and remain active for approximately 350ms
after PBRST returns HIGH. (See figures 3 and 4).
The AS1834A open drain reset outputs require pull-up
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
to the same potential through a single pull-up resistor. In this
configuration a failure on either supply will generate an active
LOW reset. If the inputs are pulled-up to different voltages,
the reset outputs (pin 2 and pin 7) cannot be connected to
form a wired “AND”(see figure 7).
8
1
3.3VIN
5VIN
7
6
5
2
5V RESET 3.3V RESET
3
4
5VTOL
GND
3.3VTOL
PBRST
µP
Input
RESET
Figure 3: Pushbutton Reset
PBRST
100kΩ
t
PB
Figure 5: ASM1834 RESET Valid to 0V
V
IH
t
PDLY
V
IL
3.3V
5V
t
ASM1834
RST
8
1
3.3VIN
5VIN
RESET
RESET
10kΩ
VOH
VOL
10kΩ
7
6
5
2
5V RESET 3.3V RESET
3
4
5VTOL
GND
3.3VTOL
PBRST
Figure 4: Timing Diagram: Pushbutton Reset
Figure 6: ASM1834A Open Drain Output Pull-Up Resistor
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Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
October 2003
ASM1834A/D
rev 1.0
5V
5V or 3.3V
3.3V
10kΩ
ASM1834A
8
7
6
1
2
3
5V
IN
3.3V
IN
3.3VRESET
3.3V TOL
PBRST
5VRESET
5V TOL
GND
4
5
Figure 7: ASM1834A Wired “AND” Connection
Trip Point Tolerance Selection
If 3.3VTOL is connected to the 3.3V supply input, a 20%
tolerance is selected. If 3.3VTOL is grounded, a 10% tolerance
is selected. (Refer table below). The 3.3VTOL and 5VTOL
tolerance select inputs should be tied to the ground or to the
respective input supply voltage pin, 3.3VIN or 5VIN.
The 3.3VTOL and 5VTOL inputs allow independent sel;ection of
the reset trip points. If 5VTOL is connected to the 5V supply
input, a 10% tolerance is selected. If 5VTOL is grounded, a 5%
tolerance is selected.
3.3V Input
5V Input
Tolerance Select
TRIP Point (V)
TRIP Point (V)
5V
3.3V
Tolerance
Tolerance
MIN
NOM
MAX
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%
10%
2.47
2.80
2.55
2.88
2.64
2.97
-
-
-
-
-
-
-
-
3.3VTOL = GND
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Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
October 2003
ASM1834A/D
rev 1.0
Absolute Maximum Ratings
Parameter
Voltage on VCC
Min
-0.5
-0.5
-0.5
Max
Unit
7
V
V
V
+5VIN + 0.5V
Voltage on 5V RESET
Voltage on 3.3V RESET
+3.3VIN + 0.5V
(+5VIN + 0.5V) or (+3.3VIN + 0.5V)
whichever is greater
Voltage on PBRST and reset outputs
-0.5
Operating Temperature Range
Soldering Temperature (for 10 sec)
Storage Temperature
Note:
-40
-
+85
260
°C
°C
°C
-55
+125
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.
Recomended DC Operating Conditions
Recomended DC operating condition over the operating temperature range of -40°C to +85°C. All voltages are referenced to
ground.
Parameter
Symbol
5VIN
3.3VIN
VIH
Conditions
Min
Typ
Max
Unit
5V Supply Voltage
1.2
5.5
5.5
V
3.3V Supply Voltage
PBRST Input High Level
PBRST Input High Level
PBRST Input Low Level
1.2
2
Both 3.3VIN and 5VIN >=2.7V
Both 3.3VIN and 5VIN <=2.7V
VINMAX + 0.3
V
V
V
VIH
VINMAX - 0.4
VIL
-0.3
0.5
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Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
October 2003
ASM1834A/D
rev 1.0
DC Electrical Characteristics
Unless otherwise noted, VIN = 1.2V to 53.5V and specifications are over the operating temperature range of -40°C to 85°C.
Recomended DC operating condition over the operating temperature range of -40°C to +85°C. All voltages are referenced to
ground.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Output = 2.4V. Either 3.3VIN or 5.5VIN
IOH
Output Current
350
µA
>=2.7V
(ASM1834/1834D only)
Output = 0.4V. Either 3.3VIN or 5.5VIN
IOL
Output Current
10
mA
>=2.7V
(ASM1834/1834D only)
VOH
IIL
ICC
VIN - 0.1V
Output Voltage
Input Leakage
V
-1.0
+1.0
30
µA
3.3VIN and 5VIN<=5.5V, RESET out-
puts open.
5V Operating Current
3.3V Operating Current
16
12
µA
µA
3.3VIN and 5VIN<=3.6V, RESET out-
puts open.
ICC
25
VINTP
VINTP
VINTP
VINTP
COUT
5V Trip Point
5VTOL = GND
5VTOL = 5VIN
4.50
4.25
2.80
2.47
4.63
4.38
2.88
2.55
4.75
4.49
2.97
2.64
10
V
V
5V Trip Point
3.3V Trip Point
3.3V Trip Point
Output Capacitance
3.3VTOL = GND
3.3VTOL = 3.3VIN
V
V
pF
PBRST Manual Reset
Minimum Low Time
tPB
2
ms
ms
PBRST Stable LOW to
reset Active
tPDLY
2
tRST
tF
Reset Active Time
VCC Slew Rate
200
300
0
350
350
500
ms
µs
ns
VINTP(MAX) to VINTP(MIN)
VINTP(MIN) to VINTP(MAX)
VCC Slew Rate
tR
VCC Detect to RESET
tRPU
trise = 5µs
200
500
2
ms
µs
or RESET
VCC Detect Noise
Immunity
tRPD
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Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
October 2003
ASM1834A/D
rev 1.0
Package Information
MicroSO (8-Pin)
Inches
Millimeteres
D
Min
Max
Min
Max
MicroSO (8-Pin)
0.0433
A
A1
A2
b
-
-
0.10
0.15
0.95
0.40
0.23
3.10
E
E1
0.0020
0.0295
0.0098
0.0051
0.1142
0.0059
0.050
0.75
0.25
0.13
2.90
0.0374
0.0157
C
0.0091
D
0.1220
L
A2
e
0.0256 BSC
0.193 BSC
0.65 BSC
4.90 BSC
C
A
E
0.10mm
0.004in
E1
L
0.1142
0.1220
0.0276
6°
2.90
0.40
0°
3.10
0.70
6°
e
A1
b
0.0157
0°
a
SO (8-Pin)
SO (8-Pin)
C
A
A1
B
0.053
0.004
0.013
0.007
0.069
0.010
0.020
0.010
1.35
0.10
0.33
0.19
1.75
0.25
0.51
0.25
L
E
H
C
e
0.050
1.27
E
0.150
0.228
0.016
0.189
0.157
3.80
5.80
0.40
4.80
4.00
6.20
1.27
2.00
H
L
0.244
D
0.050
A1
A
D
0.197
Plastic DIP (8-Pin)
A
A1
A2
b
-
0.210
-
-
5.33
-
0.015
0.115
0.014
0.045
0.030
0.355
0.005
0.300
0.240
0.100
0.300
-
0.38
2.92
0.36
1.14
0.80
9.02
0.13
7.62
6.10
2.54
7.62
-
0.195
0.022
0.070
0.045
0.400
-
4.95
0.56
1.78
1.14
10.16
-
Plastic DIP (8-Pin)
D1
b2
b3
D
E
E1
D1
E
0.325
0.280
-
8.26
7.11
D
E1
e
0° - 15°
A
A2
eA
eB
eC
L
-
L
C
0.430
0.060
0.150
10.92
3.81
A1
eA
eB
-
b2
b
0.115
2.92
8 of 10
Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
October 2003
ASM1834A/D
rev 1.0
Ordering Information
Operating Temperature
Range
Part Number
Reset Polarity
Output Stage
Package
ASM1834
ASM1834EMA
ASM1834S
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
-40°C TO 85°C
-40°C TO 85°C
-40°C TO 85°C
25°C
Push-Pull
Push-Pull
Push-Pull
Push-Pull
Open Drain
Open Drain
Open Drain
Open Drain
Push-Pull
Push-Pull
Push-Pull
Push-Pull
8-DIP
MicroSO
8-SO
ASM1834/D
ASM1834A
DICE
-40°C TO 85°C
-40°C TO 85°C
-40°C TO 85°C
25°C
8-DIP
AS1834AEMA
ASM1834AS
ASM1834A/D
ASM1834D
MicroSO
8-SO
DICE
-40°C TO 85°C
-40°C TO 85°C
-40°C TO 85°C
25°C
8-DIP
ASM1834DEMA
ASM1834DS
ASM1834D/D
MicroSO
8-SO
DICE
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Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
ASM1834A/D
Copyright © Alliance Semiconductor
All Rights Reserved
Part Number: ASM1834A/D
Document Version: 1.0
Alliance Semiconductor Corporation
2575, Augustine Drive,
Santa Clara, CA 95054
Tel: 408 - 855 - 4900
Fax: 408 - 855 - 4999
www.alsc.com
© 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
users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or customer. Alliance does not assume any responsibility
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
and/or use of Alliance products including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any
intellectual property rights, except as express agreed to in Alliance's Terms and Conditions of Sale (which are available from Alliance). All sales of
Alliance products are made exclusively according to Alliance's Terms and Conditions of Sale. The purchase of products from Alliance does not
convey a license under any patent rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of Alliance or third
parties. Alliance does not authorize its products for use as critical components in life-supporting systems where a malfunction or failure may
reasonably be expected to result in significant injury to the user, and the inclusion of Alliance products in such life-supporting systems implies that
the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use.
相关型号：
ASM1834DF-T
Power Supply Support Circuit, Fixed, 2 Channel, PDIP8, LEAD FREE, PLASTIC, DIP-8
PULSECORE
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