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November 2006  
rev 1.5  
ASM1834/A/D  
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 condition 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  
•
•
•
•
•
Monitors 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.  
Wide operating temperature, -40°C to +85°C  
•
•
•
All devices can generate reset signals through an internally  
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  
5V  
3.3V  
ASM1834  
µP  
5V  
3.3V  
IN  
IN  
RESET  
RESET  
GND  
PBRST  
GND  
5VTOL  
3.3VTOL  
PulseCore Semiconductor Corporation  
1715 S. Bascom Ave Suite 200 Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018  
www.pulsecoresemi.com  
Notice: The information in this document is subject to change without notice  
November 2006  
rev 1.5  
ASM1834/A/D  
Block Diagram  
ASM1834A  
1
ASM1834  
5 VIN  
2
5V RESET  
3
5V Tolerance  
Bias  
+
For ASM1834D  
5 VTOL  
5V RESET  
2
350ms Delay  
5V RESET  
Low TC  
Reference  
-
7
(ASM1834D)  
3.3V RESET  
40kΩ  
5
Pushbutton Level  
Sense and Debounce  
PBRST  
8
3.3 VIN  
6
For ASM1834D  
3.3 VTOL  
3.3V Tolerance  
Bias  
+
3.3V RESET  
7
350ms Delay  
3.3V RESET (ASM1834D)  
4
GND  
-
Pin Configuration  
Pin Description  
1
8
7
6
5
3.3VIN  
5VIN  
ASM1834  
ASM1834A  
ASM1834D  
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 #  
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
5V TOL  
GND  
Ground.  
PBRST  
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.  
6
3.3V TOL  
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.  
2 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  
November 2006  
rev 1.5  
ASM1834/A/D  
Detailed Description  
t
F
V
IN  
Operation Power Monitor  
V
(MAX)  
INTP  
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.  
V
(MIN)  
INTP  
RESET  
RESET  
t
RPD  
RESET Slews  
with V  
V
CC  
OH  
V
OL  
Figure 2: Timing Diagram: Power Down (ASM1834D only)  
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.  
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 stages. The ASM1834A has open drain reset outputs.  
outputs draw current from their input supplies 5VIN and  
3.3VIN.  
t
RESET  
Polarity  
Output Stage  
Configuration  
R
Part #  
V
(MAX)  
INTP  
V
INTP  
V
(MIN)  
ASM1834  
ASM1834U  
ASM1834S  
ASM1834A  
ASM1834AU  
ASM1834AS  
ASM1834D  
ASM1834DU  
ASM1834DS  
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  
INTP  
t
RPU  
V
IN  
RESET  
RESET  
V
OH  
V
OL  
Figure 1: Timing Diagram: Power Up (ASM1834D only)  
3 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  
November 2006  
rev 1.5  
ASM1834/A/D  
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  
4 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  
November 2006  
rev 1.5  
ASM1834/A/D  
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 “OR” 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 selection 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  
5 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  
November 2006  
rev 1.5  
ASM1834/A/D  
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  
V
Operating Temperature Range  
Soldering Temperature (for 10 sec)  
Storage Temperature  
-40  
-
+85  
260  
°C  
°C  
°C  
-55  
+125  
ESD rating  
HBM  
2
200  
KV  
V
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  
5VIN  
3.3VIN  
VIH  
Conditions  
Min  
1.2  
1.2  
2
Typ  
Max  
Unit  
V
5V Supply Voltage  
5.5  
5.5  
3.3V Supply Voltage  
PBRST Input High Level  
PBRST Input High Level  
PBRST Input Low Level  
V
Both 3.3VIN and 5VIN >=2.7V  
VINMAX + 0.3  
V
VIH  
Both 3.3VIN and 5VIN <=2.7V VINMAX - 0.4  
-0.3  
V
VIL  
0.5  
V
6 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  
November 2006  
rev 1.5  
ASM1834/A/D  
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.  
(Note: 3.3VIN is always < = 5VIN)  
Parameter  
Symbol  
Conditions  
Min  
Typ  
Max  
Unit  
Output = 2.4V. Either 3.3VIN or 5.5VIN  
>=2.7V  
(ASM1834/1834D only)  
IOH  
Output Current  
350  
µA  
Output = 0.4V. Either 3.3VIN or 5.5VIN  
>=2.7V  
(ASM1834/1834D only)  
IOL  
Output Current  
10  
mA  
VOH  
IIL  
VIN - 0.1V  
Output Voltage  
Input Leakage  
V
-1.0  
+1.0  
30  
µA  
3.3VIN and 5VIN<=5.5V, RESET  
outputs open.  
ICC  
5V Operating Current  
3.3V Operating Current  
16  
12  
µA  
µA  
3.3VIN and 5VIN<=3.6V, RESET  
outputs 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  
CC Detect Noise  
Immunity  
V
tRPD  
7 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  
November 2006  
rev 1.5  
ASM1834/A/D  
Package Information  
MicroSO (8-Pin)  
Dimensions  
Symbol  
Inches  
Millimeters  
Min  
Max  
0.044  
0.006  
0.038  
Min  
Max  
1.10  
0.15  
0.97  
A
A1  
A2  
b
0.032  
0.002  
0.030  
0.81  
0.05  
0.76  
0.012 BSC  
0.30 BSC  
0.65 BSC  
C
0.004  
0.114  
0.008  
0.122  
0.10  
2.90  
0.20  
3.10  
D
e
0.0256 BSC  
E1  
E
0.114  
0.184  
0.016  
0°  
0.122  
0.200  
0.026  
6°  
2.90  
4.67  
0.41  
0°  
3.10  
5.08  
0.66  
6°  
L
a
S
0.0206 BSC  
0.52 BSC  
Dimensions  
Symbol  
Inches  
Millimeters  
Min  
0.10  
1.35  
1.25  
0.31  
0.18  
SO (8-PIN)  
Min  
Max  
Max  
0.25  
1.75  
1.50  
0.51  
0.25  
A1  
A
A2  
B
C
D
E
e
H
L
0.004  
0.053  
0.049  
0.012  
0.007  
0.010  
0.069  
0.059  
0.020  
0.010  
H
E
0.193 BSC  
0.154 BSC  
0.050 BSC  
0.236 BSC  
4.90 BSC  
3.91 BSC  
1.27 BSC  
6.00 BSC  
D
A2  
A
0.016  
0°  
0.050  
8°  
0.41  
0°  
1.27  
8°  
C
θ
θ
e
A1  
L
B
Dimensions  
PLASTIC DIP (8-PIN)  
Symbol  
Inches  
Millimeters  
Min  
….  
Max  
0.210  
…..  
0.195  
0.022  
0.070  
0.014  
0.400  
0.325  
0.280  
Min  
…..  
Max  
5.33  
…..  
A
A1  
A2  
b
b2  
C
0.015  
0.115  
0.014  
0.045  
0.008  
0.355  
0.300  
0.240  
0.38  
2.92  
0.36  
1.14  
0.20  
9.02  
7.62  
6.10  
4.95  
0.56  
1.78  
0.36  
10.16  
8.26  
7.11  
D
E
E1  
e
0.10 BSC  
2.54 BSC  
eB  
L
…..  
0.115  
0.430  
0.150  
…..  
2.92  
10.92  
3.81  
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  
November 2006  
rev 1.5  
ASM1834/A/D  
Ordering Information  
Reset  
Polarity  
Operating  
Temperature Range  
Package  
Marking  
Part Number  
Output Stage  
Package  
TIN - LEAD DEVICES  
ASM1834  
LOW  
LOW  
LOW  
LOW  
LOW  
LOW  
HIGH  
HIGH  
HIGH  
-40°C TO 85°C  
-40°C TO 85°C  
-40°C TO 85°C  
-40°C TO 85°C  
-40°C TO 85°C  
-40°C TO 85°C  
-40°C TO 85°C  
-40°C TO 85°C  
-40°C TO 85°C  
Push-Pull  
Push-Pull  
Push-Pull  
Open Drain  
Open Drain  
Open Drain  
Push-Pull  
Push-Pull  
Push-Pull  
8-DIP  
MicroSO  
8-SO  
ASM1834  
ASM1834U  
ASM1834S  
ASM1834A  
ASM1834AU  
ASM1834AS  
ASM1834D  
ASM1834DU  
ASM1834DS  
ASM1834U  
ASM1834S  
ASM1834A  
8-DIP  
ASM1834AU  
ASM1834AS  
ASM1834D  
MicroSO  
8-SO  
8-DIP  
ASM1834DU  
ASM1834DS  
LEAD FREE DEVICES  
ASM1834F  
MicroSO  
8-SO  
LOW  
LOW  
LOW  
LOW  
LOW  
LOW  
HIGH  
HIGH  
HIGH  
-40°C TO 85°C  
-40°C TO 85°C  
-40°C TO 85°C  
-40°C TO 85°C  
-40°C TO 85°C  
-40°C TO 85°C  
-40°C TO 85°C  
-40°C TO 85°C  
-40°C TO 85°C  
Push-Pull  
Push-Pull  
Push-Pull  
Open Drain  
Open Drain  
Open Drain  
Push-Pull  
Push-Pull  
Push-Pull  
8-DIP  
MicroSO  
8-SO  
ASM1834F  
ASM1834UF  
ASM1834SF  
ASM1834AF  
ASM1834AUF  
ASM1834ASF  
ASM1834DF  
ASM1834DUF  
ASM1834DSF  
ASM1834UF  
ASM1834SF  
ASM1834AF  
ASM1834AUF  
ASM1834ASF  
ASM1834DF  
ASM1834DUF  
ASM1834DSF  
8-DIP  
MicroSO  
8-SO  
8-DIP  
MicroSO  
8-SO  
Note:  
For parts to be packed in Tape and Reel, add “-T” at the end of the part number.  
9 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  
November 2006  
rev 1.5  
ASM1834/A/D  
Copyright © PulseCore Semiconductor  
All Rights Reserved  
PulseCore Semiconductor Corporation  
1715 S, Bascom Ave Suite 200  
Campbell, CA 95008  
Part Number: ASM1834/A/D  
Document Version:1.5  
Tel: 408 - 879 - 9077  
Fax: 408 - 879 - 9018  
© Copyright 2006 PulseCore Semiconductor Corporation. All rights reserved. Our logo and name are trademarks or registered  
trademarks of PulseCore Semiconductor. All other brand and product names may be the trademarks of their respective companies.  
PulseCore reserves the right to make changes to this document and its products at any time without notice. PulseCore assumes no  
responsibility for any errors that may appear in this document. The data contained herein represents PulseCore’s best data and/or  
estimates at the time of issuance. PulseCore 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. PulseCore 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 PulseCore 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 PulseCore’s Terms and  
Conditions of Sale (which are available from PulseCore). All sales of PulseCore products are made exclusively according to  
PulseCore’s Terms and Conditions of Sale. The purchase of products from PulseCore does not convey a license under any patent  
rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of PulseCore or third parties. PulseCore  
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 PulseCore products in such life-supporting  
systems implies that the manufacturer assumes all risk of such use and agrees to indemnify PulseCore against all claims arising  
from such use.  
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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