IMP161, IMP162

IMP161, IMP162
POWER MANAGEMENT
ADVANCE PRODUCT INFORMATION
µP Supervisory Circuit
Key Features
– Edge Triggered, Single Pulse
Manual Reset
– Guaranteed MR Disable Period
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 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
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.
◆ 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
Low supply current makes the IMP161/162 ideal for use in battery
operated equipment. With 3V supplies power consumption is 8µW
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.
Reset Thresholds
Part Suffix
Voltage
L
M
J
T
S
R
Applications
◆ PDAs
◆ Appliances
◆ Computers and embedded controllers
◆ Wireless communication systems
◆ Embedded control systems
4.63V
4.38V
4.00V
3.08V
2.93V
2.63V
◆ Battery-operated systems
◆ Intelligent instruments
Block Diagrams
VCC
4
Voltage
Divider
IMP161/162
4
Reset Circuit
2
+
Bandgap
Reference
MR
3
VCC
–
*Edge Trigger
RESET (IMP161)
RESET (IMP162)
Daily Silver IMP
1
RPU
2
Reset
Circuit
MR
Debounce
* Non-retriggerable, edge
triggered manual reset
IMP161
161/162_01.eps
GND
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1
IMP161 , IMP162
Pin Configuration
SOT-143
GND
SOT-143
4
1
VCC
GND
1
3
2
VCC
3
MR
IMP162
IMP161
RESET
4
RESET
MR
2
161/162_02a.eps
RESET is open-drain.
161/162_02b.eps
Ordering Information
1
Part Number
IMP161LCUS/T
IMP161MCUS/T
IMP161JCUS/T
IMP161TCUS/T
IMP161SCUS/T
IMP161RCUS/T
IMP162LCUS/T
IMP162MCUS/T
IMP162JCUS/T
IMP162TCUS/T
IMP162SCUS/T
IMP162RCUS/T
IMP161LEUS/T
IMP161MEUS/T
IMP161JEUS/T
IMP161TEUS/T
IMP161SEUS/T
IMP161REUS/T
IMP162LEUS/T
IMP162MEUS/T
IMP162JEUS/T
IMP162TEUS/T
IMP162SEUS/T
IMP162REUS/T
Notes:
Reset Threshold (V)
Temperature Range
Pin-Package
Package Marking
(XX Lot Code)
4.63
4.38
4.00
3.08
2.93
2.63
4.63
4.38
4.00
3.08
2.93
2.63
4.63
4.38
4.00
3.08
2.93
2.63
4.63
4.38
4.00
3.08
2.93
2.63
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
– 4 0°C to 85°C
– 4 0°C to 85°C
– 4 0°C to 85°C
– 4 0°C to 85°C
– 4 0°C to 85°C
– 4 0°C to 85°C
– 4 0°C to 85°C
– 4 0°C to 85°C
– 4 0°C to 85°C
– 4 0°C to 85°C
– 4 0°C to 85°C
– 4 0°C to 85°C
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
4-SOT143
1 LXX
1 MXX
1 JXX
1 TXX
1 SXX
1 RXX
2 LXX
2 MXX
2 JXX
2 TXX
2 SXX
2 RXX
3 LXX
3 MXX
3 JXX
3 TXX
3 SXX
3 RXX
4 LXX
4 MXX
4 JXX
4 TXX
4 SXX
4RXX
161/162 t05 eps
1. Tape and Reel packaging is indicated by the /T designation.
Absolute Maximum Ratings
Pin Terminal Voltage with Respect to Ground
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to 6.0V
RESET,RE SET andM
R . . . . . . . . . . . . . . . . . –0.3V to (VCC + 0.3V)
R . . . . . . . . . . . 20mA
Input Current at VCC andM
Output Current: RESET orRE SET . . . . . . 20mA
Rate of Rise at VCC . . . . . . . . . . . . . . . . . . . . 100V/µs
2
Power Dissipation (TA = 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
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IMP161 , IMP162
Electrical Characteristics
Unless otherwise noted VCC is over the full voltage range and TA = 0°C to 70°C for IMP161/2xC and TA = –40°C to 85°C for IMP161/2xE
devices. Typical values at TA = 25°C, VCC = 5V for L/M/J devices, VCC = 3.3V for T/S devices and VCC = 3V for R devices.
Parameter
Symbol Conditions
Min
Typ
Max
Units
5.5
V
µA
Input Voltage (VCC) Range
VCC
TA = 0°C to 70°C
Supply Current (Unloaded)
ICC
TA = 0°C to 70°C
TA = 0°C to 70°C
VCC < 5.5V, L/M/J
VCC < 3.6V, R/S/T
6
4.5
15
10
TA = – 4 0°C to 85°C
TA = – 4 0°C to 85°C
VCC < 5.5V, L/M/J
VCC < 3.6V, R/S/T
6
4.5
15
10
L devices
TA = 25°C
Note 1
4.56
4.50
4.63
4.70
4.75
M devices
TA = 25°C
Note 1
4.31
4.25
4.38
4.45
4.50
J devices
TA = 25°C
Note 1
3.93
3.89
4.00
4.06
4.10
T devices
TA = 25°C
Note 1
3.04
3.00
3.08
3.11
3.15
S devices
TA = 25°C
Note 1
2.89
2.85
2.93
2.96
3.00
R devices
TA = 25°C
Note 1
2.59
2.55
2.63
2.66
2.70
Reset Threshold
Reset Threshold Temp. Coefficient
VTH
TCVTH
VCC to Reset Delay
Reset Pulse Width
MR Minimum Pulse Width
1.1
tPWR
VCC = VTH to (VTH - 100mV)
TA = 0°C to 70°C
800
TA = – 4 0°C to 85°C
560
MR Glitch Immunity
MR to RESET Propagation Delay
tMD
MR Input Threshold
VIH
30
ppm/°C
20
µS
1400
VCC > VTH (MAX), L/M/J devices
µS
100
ns
0.5
µS
2.3
V
0.8
VCC > VTH (MAX), R/S/T devices
0.7VCC
VIL
MR Delay to MR Retrigger
tMRD
0.25VCC
122
µS
30
kΩ
VCC = VTH min., ISINK = 1.2mA, IMP161R/S/T
0.3
V
VCC = VTH min., ISINK = 3.2mA, IMP161L/M/J
VCC > 1.1V, ISINK = 50µA
0.4
TA = 0°C to 70°C
49
MR Pull-up Resistance
Low RESET Output Voltage
10
VOL
RESET Output Leakage Current
Low RESET Output Voltage
High RESET Output Voltage
VCC = VTH max., ISINK = 1.2mA, IMP162R/S/T
0.3
V
VCC = VTH max., ISINK = 3.2mA, IMP162L/M/J
0.4
VOL
VOH
0.3
µA
VDRAIN ≤ 6.0V, 0°C ≤ TA ≤ 70°C
(IMP162)
20
1
ILKG
(IMP161)
85
85
TA = – 4 0°C to 85°C
(IMP161)
ms
2240
VIL
VIH
2000
10
tMR
V
1.8V < VCC < VTH min., ISOURCE = 150µA
0.8VCC
V
(IMP162)
Notes:
161/162_t01.eps
1. Over operating temperature range.
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IMP161 , IMP162
Pin Descriptions
Pin Number
IMP161
IMP162
1
1
Name
Description
Ground.
GND
RESET
Active-LOW, open-drain reset output. RESET remains LOW while VCC is below the
reset threshold and for 800ms minimum after VCC rises above the reset threshold.
An external pull-up resistor is needed.
2
RESET
Active-HIGH Reset output. RESET remains HIGH while VCC is below the reset
threshold and for 800ms after VCC rises above the reset threshold.
3
3
MR
Manual Reset input. A negative going edge transition on MR asserts reset. Reset
remains asserted for one reset time-out period (800ms min). This active-LOW input
has an internal pull-up resistor. It can be driven from a TTL or CMOS logic line or
shorted to ground with a switch. Leave open if unused.
4
4
VCC
Power supply input voltage.
2
161/162_t02.eps
Application Information
Reset Generation
Manual Reset
The reset function ensures the microprocessor is properly reset
and powers up into a known condition after a power failure.
The IMP161/162 have a unique manual reset circuit. A negative
going edge transition on MR initiates the reset. A manual reset
generates a single reset pulse of fixed length. The output-reset
pulse remains asserted for the Reset Active Time-Out Period tRPW
and then clears. Once the reset pulse is completed, the MR input
remains disabled for at least 49µS but not more than 122µS. This
period is specified as tMRD.
A reset is generated whenever the supply voltage is below the
threshold level (VCC < VTH). The reset duration is at least 800ms
after VCC has risen above the reset threshold and is guaranteed to
be no more than 2 seconds. The reset signal remains active as long
as the monitored supply voltage is below the internal threshold
voltage.
The IMP161 has an open-drain, active-LOW RESET output (which
is guaranteed to be in the correct state for VCC down to 1.1V). The
IMP161 uses an external pull-up resistor. Output leakage current
is under 1µA. A high resistance value can be used to minimize
current drain.
The IMP162 has an active-HIGH RESET output.
IMP Part Number
Reset Polarity
IMP161
LOW (use external pull-up resistor)
IMP162
HIGH
During the MR disable period, the microcontroller is guaranteed
a time period free of new manual reset signals. This period can be
used to refresh critical DRAM contents or other system tasks.
The MR pin must be taken HIGH and LOW again after the tMRD
period has been completed to initiate another reset pulse.
The manual reset input has an internal 20-kΩ pull-up resistor. MR
can be left open if not used.
tMD
MR
MR input is blocked
*..........
Triggering Pulse
161/162_t03.eps
RESET
Ready for
next MR
t MRD
Reset Time-out
*Second and following edges ignored.
161/162_03.eps
Figure 1. Manual Reset Timing
and MR Block Out Period
4
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Daily Silver IMP
IMP161 , IMP162
Application Information
Glitch Resistance
Valid Reset with VCC under 1.1V
The IMP161/162 are relatively immune to short duration negative-going VCC transients/glitches. A VCC transient that goes
100mV below the reset threshold and lasts 20µs or less will not
typically cause a reset pulse.
To ensure that logic inputs connected to the IMP161 RESET pin are
in a known state when VCC is under 1.1V, a 100kΩ pull-down
resistor at RESET is needed. The value is not critical.
A similar pull-up resistor to VCC is needed with the IMP162.
VCC
VCC
100kΩ
Power
Supply
IMP161
MR
Power
Supply
RESET
GND
MR
100kΩ
Figure 2. RESET Valid with VCC Under 1.1V
RESET
GND
161/162_04.eps
Daily Silver IMP
IMP162
161/162_05.eps
Figure 3. RESET Valid with VCC Under 1.1V
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5
IMP161 , IMP162
Package Dimensions
Plastic SOT-143 (4-Pin)
Inches
B
Min
e1
Millimeters
Max
Min
Max
Plastic SOT-143 (4-Pin)
E
H
0.031
0.047
0.787
1.194
A1
0.001
0.005
0.025
0.127
B
0.014
0.022
0.356
0.559
B1
0.030
0.038
0.762
0.965
e
C
0.0034
0.006
0.086
0.152
D
D
0.105
0.120
2.667
3.048
E
0.047
0.055
1.194
1.397
e
0.070
0.080
1.778
2.032
e1
0.071
0.079
1.803
2.007
H
0.082
0.098
2.083
2.489
I
0.004
0.012
0.102
0.305
B1
a = 0°-8°
A
A1
A
e
C
L
SOT-143 (4-Pin).eps
161/162_t04.eps
Daily Silver IMP Microelectronics Co.,Ltd
7 keda Road , Hi-Tech Park,
NingBo,Zhejiang, P.R.C.
Post Code : 315040
Tel:(086)-574-87906358
Fax:(086)-574-87908866
e-mail:[email protected]
Website:www.ds-imp.com.cn
The IMP logo is a registered trademark of Daily Silver IMP.
All other company and product names are trademarks of their respective owners.
2005 Daily Silver IMP
Revision : A
Issue Date: 08/08/05
Type: Product