IMP IMP1815 Low power 5v/3.0v p reset Datasheet

IMP1 233M
POWER MANAGEMENT
Low Power, 5V/3.0V µP Reset
Key Features
– Active LOW, Open-Drain Output
– 350ms Reset Period
The IMP1233M supply voltage monitor is an improved, low-power
replacement for the Dallas Semiconductor DS1233M. Maximum supply
current over temperature is a low 20µA, representing 60 percent lower
power as compared to the DS1233M.
The IMP1233M issues an active LOW reset signal whenever the monitored supply is out-of-tolerance. A precision reference and comparator
circuit monitor power supply (VCC) level. Tolerance level options are
5- and 10-percent for a 5V power supply. The tolerance is 15-percent for
the 3.3V, IMP1233M. When an out-of-tolerance condition is detected, an
internal power-fail signal is generated which forces an active LOW reset
signal. After VCC returns to an in-tolerance condition, the reset signal
remains active for 350ms to allow the power supply and system microprocessor to stabilize.
The IMP1233M is designed with a open-drain output stage and operates
over the extended industrial temperature range. Devices are available in
the compact surface mount SO-8 package.
Other low power products in this family include the IMP1810/11/12/15/
16/17 and IMP1233D.
◆ Improved Dallas DS1233M replacement
— 60% lower maximum supply current
◆ Low Supply Current
— 20µA maximum (5.5V)
— 15µA maximum (3.6V)
◆ Automatically restarts a microprocessor after
power failure
◆ 350ms reset delay after VCC 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
◆ Pin function compatible with the Motorola
MC33064, MC34064, MC33164 and MC34164
◆ Motorola 68xxx and HC16 compatible
◆ Compact surface mount SO-8 package
◆ Operating temperature – 40°C to +85°C
Family Selection Guide
Applications
RESET Voltage RESET Time
(V)
(ms)
Part
IMP1810
IMP1811
IMP1812
IMP1815
IMP1816
IMP1817
IMP1233D
IMP1233M
4.620,
4.620,
4.620,
3.060,
3.060,
3.060,
4.625,
4.625,
4.370,
4.350,
4.350,
2.880,
2.880,
2.880,
4.375,
4.375,
4.120
4.130
4.130
2.550
2.550
2.550
4.125
2.720
150
150
150
150
150
150
350
350
Output
Stage
RESET
Polarity
Push-Pull
Open-Drain
Push-Pull
Push-Pull
Open-Drain
Push-Pull
Open-Drain
Open-Drain
LOW
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
◆
◆
◆
◆
◆
◆
◆
Set-top boxes
Cellular phones
PDAs
Energy management systems
Embedded control systems
Printers
Single board computers
Block Diagram
Typical Application
VCC
VCC
Supply
Tolerance
Bias
IMP1233M
5.0kW
IMP1233M
RESET
+
–
Delay
350ms Typical
RESET
RESET
GND
Reference
GND
2000 © IMP, Inc.
Microprocessor
1233M_02.eps
1233M_01.eps
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1
IMP1233M
Pin Configuration
SO-8
RESET
1
8
NC
VCC
2
7
NC
NC
3
6
NC
GND
4
5
NC
IMP1233M
1233M_03.eps
Pin Descriptions
Pin Numbers
SO-8
TO-92
1
2
3, 5, 6, 7 and 8
4
1
2
—
3
Name
Function
RESET
VCC
NC
GND
Active LOW reset output
Power supply input
No connection
Ground
Ordering Information
Device Summary
Part**
Number
RESET
Output
Voltage
(V)
RESET
Tolerance
(%)
RESET
Time
(ms)
Open-Drain*
IMP1233MS-55/T
4.625
5
350
IMP1233MS-5/T
4.375
10
IMP1233MS-3/T
2.720
15
Output Stage
SO-8
Package
RESET
Polarity
"
"
LOW
350
"
"
LOW
350
"
"
LOW
* Internal 5kΩ resistor pull up.
** /T indicates Tape and Reel.
2
Push-Pull
1233M_t03.eps
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2000 © IMP, Inc.
!
IMP1233M
Absolute Maximum Ratings
Voltage on VCC . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to 6.5V
Voltage on RESET . . . . . . . . . . . . . . . . . . . . . –0.5V to VCC + 0.5V
Operating Temperature Range . . . . . . . . . . . –40°C to 85°C
Soldering Temperature . . . . . . . . . . . . . . . . . . 260°C for 10 seconds
Storage Temperature . . . . . . . . . . . . . . . . . . . –55°C to 125°C
Voltages measured with respect to ground.
These are stress ratings only and functional operation is not implied.
Electrical Characteristics
Unless otherwise noted, VCC = 1.2V to 5.5V and specifications are over the operating temperature range of – 40°C to +85°C.
All voltages are referenced to ground.
Parameter
Symbol
Supply Voltage
VCC
Conditions
Output Voltage
VOH
IOUT < 500µA
Output Current
IOL
Output = 0.4V, VCC ≥ 2.7V
Operating Current
ICC
VCC < 5.5V, RESET output open
ICC
VCC ≤ 3.6V, RESET output open
Min
Typ
1.2
VCC – 0.5V
Max
Units
5.5
V
VCC – 0.1V
V
+8
mA
8
20
µA
6
15
µA
4.25
4.375
4.49
V
VCCTP
4.5
4.625
4.75
V
VCCTP
2.64
2.72
2.8
V
VHTL
4.75
V
Voltage Low Trip Level
IMP1233M-5
IMP1233M-55
VLTL
4.00
V
Voltage High Trip Level
IMP1233M-3
VHTL
3.14
V
Voltage Low Trip Level
IMP1233M-3
VLTL
2.48
V
Internal Pull-Up Resistor
RP
7.5
kΩ
10
pF
10
µs
Operating Current
VCC Trip Point (IMP1233M-5)
VCCTP
VCC Trip Point (IMP1233M-55)
VCC Trip Point (IMP1233M-3)
Voltage High Trip Level
IMP1233M-5
IMP1233M-55
Output Capacitance
C OUT
VCC Detect to RESET Low
t RPD
3.5
5.0
2
VCC Slew Rate
(VHTL - VLTL)
tF
300
µs
VCC Slew Rate
(VLTL - VHTL)
tR
0
ns
VCC Detect to RESET High
t RPU
t R = 5µs
200
350
500
ms
Notes: 1. A 1kΩ external resistor maybe required in some applications for proper operation of the microprocessor reset control circuit.
2000 © IMP, Inc.
Microprocessor Supervisor
3
IMP1233M
Application Information
Operation – Power Monitor
The IMP1233M detects out-of-tolerance power supply conditions.
It resets a processor during power-up and issues a reset to the
system processor when the monitored power supply voltage
is below the reset threshold (power-down). When an out-oftolerance VCC 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.
tR
VHTL
VCCTP
VLTL
VCC
tRPU
VOH
RESET
1233M_05.eps
Figure 1. Timing Diagram: Power-Up
tF
VCC
VHTL
VCCTP
VLTL
tRPD
RESET
VOL
1233M_06.eps
Figure 2. Timing Diagram: Power-Down
4
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2000 © IMP, Inc.
!
IMP1233M
Absolute Maximum Ratings
Plastic SO-8 (8-Pin)
Inches
Millimeters
Min
0°– 8°
L
E
Max
Min
Max
Plastic SO-8 (8-Pin)
H
A
A1
B
C
e
E
H
L
D
0.053
0.004
0.013
0.007
0.069
0.010
0.020
0.010
1.35
0.10
0.33
0.19
0.157
0.244
0.050
0.197
3.80
5.80
0.40
4.80
0.050
0.150
0.228
0.016
0.189
1.75
0.25
0.51
0.25
1.27
4.00
6.20
1.27
2.00
1233M_t5.eps
C
D
A
e
B
2000 © IMP, Inc.
A1
SO (8-Pin).eps
Microprocessor Supervisor
5
IMP1233M
IMP, Inc.
Corporate Headquarters
2830 N. First Street
San Jose, CA 95134-2071
Tel: 408-432-9100
Tel: 800-438-3722
Fax: 408-434-0335
e-mail: [email protected]
http://www.impweb.com
The IMP logo is a registered trademark of IMP, Inc.
All other company and product names are trademarks of their respective owners.
2000 © IMP, Inc.
Printed in USA
Publication #: 1013
Revision:
B
Issue Date:
06/01/00
Type:
Preliminary
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