ASM1233D-L/D/M
Low Power, 5V/3.3V,
μP
Reset,
Active LOW, Open-Drain Output
General Description
The ASM1233D-L/1233D/1233M are voltage supervisors
with low-power, 5/3.3V μP Reset, with an active LOW,
open-drain output. Maximum supply current over
temperature is 15μA for 3.3V devices and 20μA for 5V
devices.
The ASM1233D-L/1233D/1233M generates an active
LOW reset signal whenever the monitored supply is out
of tolerance. A precision reference and comparator circuit
monitors power supply (V
CC
) level. The tolerances are 5%,
10% and 15%. When an out-of-tolerance condition is
detected, an internal power-fail signal is generated which
forces an active LOW reset signal. After V
CC
returns to an
in-tolerance condition, the reset signal remains active for
350ms to allow the power supply and system
microprocessor to stabilize.
The ASM1233D-L/1233D/1233M is designed with an
open drain output stage and operates over the extended
industrial temperature range. These devices are available
in compact SOT-223, SO-8 and TO-92 packages.
Other low power products in this family include
ASM1810/11/12/15/16/17.
Key Features
Low Supply Current
15μA maximum (≤ 3.6V), 20μA maximum (5.5V)
Automatically restarts a microprocessor after power
failure
350ms reset delay after V
CC
returns to an in-
tolerance condition
Active LOW power-up reset, 5kΩ internal pull-up
Precision temperature-compensated voltage
reference and comparator
Eliminates external components
Low-cost SOT-223/SO-8/TO-92 packages
Operating temperature: -40°C to +85°C
Applications
Set-top boxes
Cellular phones
PDAs
Energy management systems
Embedded control systems
Printers
Single board computers
Typical Operating Circuit
©2010 SCILLC. All rights reserved.
JANUARY 2010 – Rev. 2
Publication Order Number:
ASM1233/D
ASM1233D-L/D/M
Application Information
Operation - Power Monitor
The ASM1233D-L/1233D/1233M detects out-of-tolerance
Power supply conditions. It resets a processor during
powerup, Power-down and generates a reset to the
system Processor when the monitored power supply
voltage is below the reset threshold. When an out-of-
tolerance V
CC
voltage is detected, the RESET signal is
asserted. On power-up, RESET is kept active (LOW) for
approximately 350ms after the power supply voltage has
reached the selected tolerance. This allows the power
supply and microprocessor to stabilize before RESET is
released.
Absolute Maximum Ratings
Parameter
Voltage on V
CC
2
2
1
Min
-0.5
-0.5
-40
-55
Max
7
V
CC
+ 0.5
+85
+260
+125
2
200
Unit
V
V
°C
°C
°C
KV
V
Voltage on RESET
Operating Temperature Range
Soldering Temperature (for 10 sec)
Storage Temperature
ESD rating
HBM
MM
Notes: 1. These are stress ratings only and functional implication is not implied. Exposure to absolute maximum ratings for extended periods may affect
device reliability.
2. Voltages are measured with respect to ground
Rev. 2 | Page 4 of 11 | www.onsemi.com
ASM1233D-L/D/M
DC Electrical Characteristics
Unless otherwise noted, V
CC
= 5V±10% and specifications are over the operating temperature range of - 40°C to +85°C. All voltages are referenced to ground.
Parameter
Supply Voltage
Output Voltage
Output Current
Operating Current
Symbol
V
CC
V
OL
V
OH
I
OL
I
CC
Conditions
Min
1.2
Typ
Max
5.5
0.4
Unit
V
V
mA
RESET asserted
I
OUT
< 500 μA
Output = 0.4V
V
CC
< 5.5V, RESET output open
V
CC
≤ 3.6V, RESET output open
ASM1233D-LZ-5
ASM1233D-LZ-10
ASM1233D-LZ-15
ASM1233DZ-5
ASM1233DZ-10
ASM1233DZ-15
ASM1233M-5
ASM1233M-55
ASM1233M-3
ASM1233D, ASM1233MS-5,
2.98
2.8
2.64
4.5
4.25
4.0
4.25
4.5
2.64
V
CC
-0.5V
8
8
6
3.06
2.88
2.72
4.625
4.375
4.125
4.375
4.625
2.72
V
CC
-0.1V
20
15
3.15
2.97
2.8
4.74
4.49
4.24
4.49
4.75
2.8
4.75
3.14
3.06
4.00
2.48
2.3
μA
V
CC
Trip Point
V
CCTP
V
Voltage High Trip
Level
V
HTL
ASM1233MS-55
ASM1233MS-3
ASM1233D-L
ASM1233D, ASM1233MS-5,
V
Voltage Low Trip
Level
Internal Pull-up
Resistor
Output
Capacitance
V
CC
Detect to
RESET Low
V
CC
Detect to
RESET High
V
CC
Slew Rate
(V
HTL
- V
LTL
)
V
CC
Slew Rate
(V
LTL
- V
HTL
)
V
LTL
ASM1233MS-55
ASM1233MS-3
ASM1233D-L
V
R
P
C
OUT
t
RPD
t
RPU
t
F
t
R
ASM1233D-L, ASM1233M
ASM1233D
3.5
5.0
7.5
10
kΩ
pF
μs
ms
μs
2
200
250
300
0
350
350
10
500
450
ns
Note: A 1kΩ resistor maybe required in some applications for proper operation of the microprocessor reset control circuit.
Rev. 2 | Page 5 of 11 | www.onsemi.com
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