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參數資料
| 型號： | ASM161JCUS/T |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4 |
| 封裝： | PLASTIC, SOT-143, 4 PIN |
| 文件頁數： | 1/9頁 |
| 文件大小： | 341K |
| 代理商： | ASM161JCUS/T |
ASM161 and ASM162
μP Supervisory Circuit
2010 SCILLC. All rights reserved.
Publication Order Number:
JANUARY 2010 – Rev. 2
ASM161/D
General Description
The ASM161 and ASM162 are cost effective, low power
supervisory circuits that monitor power supplies in
microprocessor, microcontroller and digital systems. If the
power supply drops below the reset threshold level, a
reset is asserted and remains asserted for at least 800ms
after VCC has risen above the reset threshold. An
improved manual reset architecture gives the system
designer additional flexibility.
The debounced manual reset input is negative edge
triggered. The reset pulse period generated by a MR
transition is a minimum of 800ms and a maximum of
2
sec duration. In addition, The MR input signal is blocked
for an additional 49μS minimum after the reset pulse
ends. During the MR disable period, the microcontroller is
guaranteed a time period free of additional manual reset
signals. During this period DRAM contents can be
refreshed or other critical system tasks undertaken. Low
power consumption makes the ASM161/162 ideal for use
in portable and battery operated equipments. With 3V
supplies,
power consumption is 8μW typically and 30μW
maximum. The ASM161 has an open-drain, active-LOW
RESET output and requires an external pull-up resistor.
The ASM162 has an active HIGH RESET output.
The ASM161/162 are offered in compact 4-pin SOT-143
packages. No external components are required to trim
threshold voltage for monitoring different supply voltages.
With six different factory set, reset, threshold ranges from
2.63V to 4.63V, the ASM161/162 are suitable for
monitoring 5V, 3.6V and 3.0V supplies. The ASM161/162
are available in temperature ranges 0°c to 70°c and -40°c
to +85°c.
Reset Threshold
Part Suffix
Voltage (V)
L
4.63
M
4.38
J
4.00
T
3.08
S
2.93
R
2.63
Key Features
Edge triggered manual reset input
single pulse output
49μS minimum MR disable period after reset
CMOS/TTL logic or switch interface
Debounced input
Low supply current extends battery life
6μA / 15μA typ/max at 5.5V
4.5μA / 10μA typ/max at 3.6V
Long reset period
0.8 sec minimum, 2 sec maximum
Two reset polarity options
ASM161: Active LOW, open-drain
ASM162: Active HIGH
Pinout matches the ASM811/812
Small 4-Pin SOT-143 package
Two temperature ranges: 0°c to 70°c
and -40°c to +85°c
Applications
PDAs
Appliances
Computers and embedded controllers
Wireless communication systems
Battery operated and intelligent instruments
Automotive systems
Safety systems
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