1
Key Features
Applications
◆ PDAs
◆ Appliances
◆ Computers and embedded controllers
◆
Wireless communication systems
◆ Embedded control systems
◆ Battery-operated systems
◆
Intelligent instruments
◆
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
— IMP161: Active LOW, open-drain
— IMP162: Active HIGH
◆
Pinout matches the IMP811/812
◆
Small 4-pin SOT-143 package
Block Diagrams
IMP1
IMP1
6
6
1
1
, IMP1
, IMP1
62
62
ADVANCE PRODUCT INFORMATIONPOWER MANAGEMENT
µ
µ
P Super
P Super
visor
visor
y Cir
y Cir
cuit
cuit
– Edg
– Edg
e T
e T
r
r
igg
igg
er
er
ed, Sing
ed, Sing
le Pulse
le Pulse
Manual R
Manual R
eset
eset
– Guar
– Guar
ant
ant
eed MR Disable P
eed MR Disable P
er
er
iod
iod
The IMP161 and IMP162 are low power supervisory circuits that monitor
power supplies in microprocessor based systems. If the power
supply drops below the reset threshold level, a reset is asserted and
remains asserted for at least 800ms after V
CC
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
maximum of 2 sec. 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 supply current makes the IMP161/162 ideal for use in battery
operated equipment. With 3V supplies power consumption is 8
µ
W
typically and 30µW maximum.
The IMP161 has an open-drain, active-LOW RESET output and uses an
external pull-up resistor. The IMP162 has an active-HIGH RESET output.
Available in compact 4-pin SOT-143 packages, six voltage thresholds are
offered to support 3.0V, 3.3V and 5V power systems.
IMP161/162
IMP161
–
+
Reset Circuit
Reset
Circuit
Voltage
Divider
Bandgap
Reference
*Edge Trigger
GND
1
RESET (IMP161)
RESET (IMP162)
R
PU
4
V
CC
2
2
MR
3
4
161/162_01.eps
V
CC
MR
Debounce
* Non-retriggerable, edge
triggered manual reset
Reset Thresholds
Part Suffix Voltage
L 4.63V
M 4.38V
J 4.00V
T 3.08V
S 2.93V
R 2.63V
Daily Silver IMP www.ds-imp.com.cn
IMP1
IMP1
6
6
1
1
, IMP1
, IMP1
62
62
2
Ordering Information
IMP161
GND
RESET
V
CC
4
MR
RESET is open-drain.
3
2
1
161/162_02a.eps
IMP162
GND
RESET
V
CC
4
MR
3
2
1
161/162_02b.eps
SOT-143 SOT-143
Pin Terminal Voltage with Respect to Ground
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to 6.0V
RESET,RE SET and MR . . . . . . . . . . . . . . . . . –0.3V to (V
CC
+ 0.3V)
Input Current at V
CC
and MR . . . . . . . . . . . 20mA
Output Current: RESET orRE SET . . . . . . 20mA
Rate of Rise at V
CC
. . . . . . . . . . . . . . . . . . . . 100V/µs
Power Dissipation (T
A
= 70°C) . . . . . . . . . . 320mW
Operating Temperature Range . . . . . . . . . . 0°C to 70°C
Storage Temperature Range . . . . . . . . . . . . . –65°C to 160°C
Lead Temperature (soldering, 10 sec) . . . . . 300°C
These are stress ratings only and functional operation is not implied.
Exposure to absolute maximum ratings for prolonged time periods may
affect device reliability
Notes: 1. Tape and Reel packaging is indicated by the /T designation.
Absolute Maximum Ratings
Pin Configuration
rebmuNtraP
1
)V(dlohserhTteseRegnaRerutarepmeTegakcaP-niP
gnikraMegakcaP
)edoCtoLXX(
T/SUCL161PMI36.40C°07otC°341TOS-4XXL1
T/SUCM161PMI83.40C°07otC°341TOS-4XXM1
T/SUCJ161PM
I0
0.
40C
°0
7o
tC
°3
41TOS-
4X
XJ1
T/SUCT161PM
I8
0.
30C
°0
7o
tC
°3
41TOS-
4X
XT1
T/SUCS161PM
I3
9.
20C
°0
7o
tC
°3
41TOS-
4X
XS1
T/SUCR161PM
I3
6.
20C
°0
7o
tC
°3
41TOS-
4X
XR1
T/SUCL261PMI36.40C°07otC°341TOS-4XXL2
T/SUCM261PMI83.40C°07otC°341TOS-4XXM2
T/SUCJ261PMI00.40C°07otC°341TOS-4XXJ2
T/SUCT261PMI80.30C°07otC°341TOS-4XXT2
T/SUCS261PMI39.20C°07otC°341TOS-4XXS2
T/SUCR261PMI36.20C°07otC°341TOS-4XXR2
T/SUEL161PMI36.44–0C°58otC°341TOS-4XXL3
T/SUEM161PMI83.44–0C°58otC°341TOS-4XXM3
T/SUEJ161PMI00.44–0C°58otC°341TOS-4XXJ3
T/SUET161PMI80.34–0C°58otC°341TOS-4XXT3
T/SUES161PMI39.24–0C°58otC°341TOS-4XXS3
T/SUER161PMI36.24–0C°58otC°341TOS-4XXR3
T/SUEL261PMI36.44–0C°58otC°341TOS-4XXL4
T/SUEM261PM
I83.
44–0C
°5
8otC
°341TOS-
4XXM4
T/SUEJ261PMI0
0.44
–0C
°58o
tC°3
41TOS-4X
XJ4
T/SUET261PM
I80.
34–0C
°5
8otC
°341TOS-
4XXT4
T/SUES261PMI39.24–0C°58otC°341TOS-4XXS4
T/SUER261PM
I36.
24
–0C°5
8otC
°341TOS-
4XXR4
spe50t261/161
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