A1 PROs IMP1834DS Duall 5v and 3..3v mp power supplly superviissorss w/manuall ressett Datasheet

IMP183 4/A/D
POWER MANAGEMENT
Dual 5V and 3.3V µP Power
Supply Supervisors w/Manual Reset
– Push-Pull and Open-Dr ain Outputs
– Select able T r ip Point Toler ance
The IMP1834 supervisors simultaneously monitor both 3.3V and 5V
power sources and issue reset signals when either supply is out of tolerance. When an out-of-tolerance condition is detected, the output-reset
signal of the affected supply becomes active and resets the system microprocessor/microcontroller. On power-up and after the supply voltage
returns to an in-tolerance condition, the reset signal remains active for
approximately 350ms. This allows the power supply and system microprocessor to stabilize.
The IMP1834 supervisors are pin-compatible with devices from Dallas
Semiconductor and require up to 40% less current.
Tolerance levels are independently selectable for both supplies.
Tolerance options are 5- and 10-percent for the 5V supply and for the
3.3V supply, 10- and 20-percent.
The IMP1834 and IMP1834D have push-pull reset output stages. The
IMP1834A active LOW reset outputs are open drain devices that can
both be connected to either 5 volt or 3.3 volt supply. The IMP1834 and
IMP1834A have active LOW reset outputs. The IMP1834D has active
HIGH reset outputs.
All devices can issue reset signals through an internally debounced
pushbutton reset input that affects both reset outputs.
All devices operate over the extended industrial temperature range.
Devices are available in 8-pin DIP, surface mount 8-pin SO and 8-pin
MicroSO packages. Die are also available.
Key Features
◆ Lower power, pin-compatible replacements for
the Dallas DS1834
— 40% lower maximum supply current:
30µA vs 50µA
◆ Monitor 5V and 3.3V supplies simultaneously
◆ 5V and 3.3V power-on reset
◆ 350ms reset time
◆ Debounced pushbutton reset input
◆ Push-Pull CMOS output
— IMP1834, IMP1834D
— Eliminates external pull-up resistors
— Active LOW (IMP1834), HIGH (IMP1834D)
◆ Open drain output
— IMP1834A
— Active LOW
◆ Selectable 5V and 3.3V trip point tolerance
◆ Internal power drawn from highest input
voltage, 5V or 3.3V
◆ Precision temperature-compensated voltage
reference and comparator
◆ Low-cost surface mount SO, compact
MicroSO and DIP packages
◆ Wide operating temperature, – 40°C to +85°C
IMP1834A
2
5VRESET
Block Diagram
7
IMP1834
5VIN
3.3VRESET
1
1834_02.eps
5VTOL
3
5V Tolerance
Bias
+
Low TC
Reference
–
40kΩ
PBRST
5
3.3VIN
8
3.3VTOL
GND
6
4
3.3V Tolerance
Bias
For IMP1834D
350 ms
Delay
2
350 ms
Delay
7
5VRESET
5VRESET (IMP1834D)
Pushbutton Level
Sense and Debounce
For IMP1834D
+
3.3VRESET
3.3VRESET (IMP1834D)
–
1834_01.eps
© 1999 IMP, Inc.
408-432-9100/www.impweb.com
1
IMP183 4/A/D
Pin Configuration
DIP/SO/MicroSO
5VIN
1
5VRESET*
2
5VTOL
3
GND
4
IMP1834
IMP1834A
IMP1834D
8
3.3VIN
7
3.3VRESET*
6
3.3VTOL
5
PBRST
* IMP1834D reset outputs are
active HIGH (5VRESET and 3.3VRESET).
Outputs are open drain for IMP1834A.
1834_03.eps
Pin Descriptions
Pin Number
Name
1
5VIN
2
5VRESET
5VRESET
3
5VTOL
4
GND
5
PBRST
6
3.3VTOL
7
3.3VRESET
3.3VRESET
8
3.3VIN
Function
5V power supply input.
5V reset output (Active LOW, IMP1834, IMP1834A. Open drain outputs for IMP1834A).
5V reset output (Active HIGH, IMP1834D).
5V input tolerance select: 10% tolerance for 5VTOL 5VIN and 5% tolerance for 5VTOL = GND.
Ground.
Debounced manual pushbutton reset input (40kΩ internal pull up).
3.3V input tolerance select: 20% tolerance for 3.3VTOL = 3.3VIN, and 10% tolerance for
3.3VTOL = GND.
3.3V reset output (Active LOW, IMP1834, IMP1834A. Open drain outputs for IMP1834A).
3.3V reset output (Active HIGH, IMP1834D).
3.3V power supply input.
1834_01t.eps
Ordering Information
Part Number
Package
Operating
Temperature Range
Reset Polarity
Output Stage
IMP1834
8-DIP
– 40°C to 85°C
LOW
Push-Pull
IMP1834EMA
MicroSO
– 40°C to 85°C
LOW
Push-Pull
IMP1834S
8-SO
– 40°C to 85°C
LOW
Push-Pull
IMP1834/D
DICE
25°C
LOW
Push-Pull
IMP1834A
8-DIP
– 40°C to 85°C
LOW
Open Drain
IMP1834AEMA
MicroSO
– 40°C to 85°C
LOW
Open Drain
IMP1834AS
8-SO
– 40°C to 85°C
LOW
Open Drain
IMP1834A/D
DICE
25°C
LOW
Open Drain
IMP1834D
8-DIP
– 40°C to 85°C
HIGH
Push-Pull
IMP1834DEMA
MicroSO
– 40°C to 85°C
HIGH
Push-Pull
IMP1834DS
8-SO
– 40°C to 85°C
HIGH
Push-Pull
IMP1834D/D
DICE
25°C
HIGH
Push-Pull
1834_02t.eps
2
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© 1999 IMP, Inc.
IMP183 4/A/D
Absolute Maximum Ratings
Voltage on VIN pins . . . . . . . . . . . . . . . . –0.5V to 7V
Voltage on 5VRESET . . . . . . . . . . . . . . . –0.5V to (+5VIN +0.5V)
(IMP1834, IMP1834D)
Voltage on 3.3VRESET . . . . . . . . . . . . . . –0.5V to (+3.3VIN +0.5V)
(IMP1834, IMP1834D)
Voltage on PBRST and reset outputs . . –0.5V to the greater of
5VIN +0.5V or 3.3VIN +0.5V
(IMP1834A)
Operating Temperature Range . . . . . . . –40°C to 85°C
Storage Temperature . . . . . . . . . . . . . . . –55°C to 125°C
Soldering Temperature . . . . . . . . . . . . . . 260°C for 10 seconds
Voltages measured with respect to ground.
These are stress ratings only and functional operation is not implied.
Electrical Characteristics
Recommended DC operating condition over the operating temperature range of –40°C to +85°C.
All voltages are referenced to ground.
Parameter
5V Supply Voltage (5VIN)
3.3V Supply Voltage (3.3V)
PBRST Input High Level
PBRST Input High Level
PBRST Input Low Level
Symbol
5VIN
3.3VIN
VIH
VIH
VIL
Conditions
Both 3.3VIN and 5VIN ≥ 2.7V
Both 3.3VIN and 5VIN ≤ 2.7V
Min
Typ
1.2
1.2
2
VINMAX – 0.4V
– 0.3
Max
Units
5.5
5.5
VINMAX + 0.3V
V
V
V
V
V
0.5
Unless otherwise noted, VIN = 1.2V to 5.5V and specifications are over the operating temperature range of –40°C to +85°C.
Parameter
Symbol
Output Voltage
Input Leakage
Output Current
VOH
IIL
IOH
Output Current
IOL
5V Operating Current
ICC
3.3V Operating Current
ICC
5V Trip Point
5V Trip Point
3.3V Trip Point
3.3V Trip Point
Output Capacitance
PBRST Manual Reset
Minimum Low Time
PBRST Stable LOW to
Reset Active
Reset Active Time
VCC Detect Noise Immunity
VCC Slew Rate
VCC Slew Rate
VCC Detect to RESET or RESET
© 1999 IMP, Inc.
VINTP
VINTP
VINTP
VINTP
COUT
tPB
Conditions
Min
Typ
–1.0
Output = 2.4V. Either 3.3VIN or
5VIN ≥ 2.7V.
(IMP1834/1834D only)
Output = 0.4V. Either 3.3VIN or
5VIN ≥ 2.7V.
(IMP1834/1834D only)
3.3VIN and 5VIN ≤ 5.5V,
RESET outputs open.
3.3VIN and 5VIN ≤ 3.6V,
RESET outputs open.
5VTOL = GND
5VTOL = 5VIN
3.3VTOL = GND
3.3VTOL = 3.3VIN
Units
+1.0
V
µA
µA
350
+10
4.50
4.25
2.80
2.47
mA
16
30
µA
12
25
µA
4.63
4.38
2.88
2.55
4.75
4.49
2.97
2.64
10
V
V
V
V
pF
ms
2
ms
ms
µs
µs
ns
ms
2
tPDLY
tRST
tRPD
tF
tR
tRPU
Max
VIN – 0.1V
VINTP (MAX) to VINTP (MIN)
VINTP (MIN) to VINTP (MAX)
trise = 5µs
408-432-9100/www.impweb.com
200
350
500
2
300
0
200
350
500
3
IMP183 4/A/D
Application Information
Operation – Power Monitor
Reset Signal Polarity and Output Stage Structure
The IMP1834 supervisors simultaneously detect out-of-tolerance
power supply conditions on both 3.3V and 5V power supplies. If
the voltages at 5VIN or 3.3VIN are outside the tolerance band, the
reset for the failing supply voltage becomes active. When the monitored supply returns to an in-tolerance state, the reset remains active
for approximately 350ms before returning to the inactive state.
The IMP1834 and IMP1834A supervisors have active LOW reset
signals. The IMP1834D reset outputs are active HIGH.
On power-up, the reset signals are kept active for approximately
350ms after the power supply voltages have reached the selected
tolerance. This allows the power supply and microprocessor to
stabilize before the reset is removed.
All supply current for the IMP1834 devices is drawn from the
input (5VIN or 3.3VIN) with the highest voltage level. The outputs
draw current from their input supplies 5VIN and 3.3VIN.
tR
VINTP (Max)
IMP Part
IMP1834
IMP1834EMA
IMP1834S
IMP1834A
IMP1834AEMA
IMP1834AS
IMP1834D
IMP1834DEMA
IMP1834DS
RESET Polarity
Output Stage
Configuration
LOW
LOW
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
Push-Pull
Push-Pull
Push-Pull
Open Drain
Open Drain
Open Drain
Push-Pull
Push-Pull
Push-Pull
Trip Point Tolerance Selection
VINTP
VINTP (Min)
The IMP1834 and IMP1834D have CMOS push-pull output
stages. The IMP1834A has open drain reset outputs.
The 3.3VTOL and 5VTOL inputs allow independent selection of
the reset trip points. If 5VTOL is connected to the 5V supply input,
a 10% tolerance is selected. If 5VTOL is grounded, a 5% tolerance
is selected.
VIN
tRPU
RESET
VOH
VOL
RESET
(IMP1834D Only)
If 3.3VTOL is connected to the 3.3V supply input, a 20% tolerance
is selected. If 3.3VTOL is grounded, a 10% tolerance is selected.
See Table 1.
The 3.3VTOL and 5VTOL tolerance select inputs should be tied to
ground or to the respective input supply voltage pin, 3.3VIN or 5VIN.
1834_10.eps
Figure 1. Timing Diagram: Power Up
VIN
tF
VINTP (Max)
VINTP
VINTP (Min)
> tRPD
RESET
VOH
RESET Slews
with VCC
VOL
RESET
(IMP1834D Only)
1834_09.eps
Figure 2. Timing Diagram: Power Down
4
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© 1999 IMP, Inc.
IMP183 4/A/D
Application Information
Table 1. Threshold Selection
3.3V Input
Tolerance Select
5V Input
TRIP Point (V)
3.3V
Tolerance
MIN
Nominal
—
—
—
5VTOL = 5VIN
5VTOL = GND
TRIP Point (V)
MAX
5V
Tolerance
MIN
Nominal
MAX
—
10%
4.25
4.38
4.49
—
—
—
—
5%
4.5
4.63
4.75
3.3VTOL = 3.3VIN
20%
2.47
2.55
2.64
—
—
—
—
3.3VTOL = GND
10%
2.80
2.88
2.97
—
—
—
—
1834_03t.eps
Manual Reset Operation
Pushbutton switch input, PBRST, allows the user to override the
internal trip point detection circuits and issue reset signals. The
pushbutton input is debounced and is pulled HIGH through a
40kΩ, internal pull-up resistor.
5V
3.3V
IMP1834
1
2
3
4
5VIN
3.3VIN
5VRESET 3.3VRESET
5VTOL
GND
tPB
PBRST
3.3VTOL
PBRST
tPDLY
8
6
tRST
RESET
5
Figure 3. Pushbutton Reset
VIH
VIL
7
1834_04.eps
© 1999 IMP, Inc.
When at least one of the reset outputs is not asserted, a pushbutton initiated reset signal can be issued by holding PBRST LOW for
at least 2ms. When PBRST is held LOW, both resets become active
and remain active for approximately 350ms after PBRST returns
HIGH. See Figure 3 and Figure 4.
VOH
RESET
(IMP1834D)
VOL
1834_05.eps
Figure 4. Timing Diagram: Pushbutton Reset
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5
IMP183 4/A/D
Application Information
Reset Output Signal
Reset output signals are valid as long as either voltage at 5VIN
or 3.3VIN is above 1.2V. In addition, the IMP1834 has push-pull
outputs that can remain valid below a 1.2V input level. To sink
current below 1.2V, a resistor should be connected from the reset
output to ground. This resistor guarantees a valid reset signal
down to 0V. A 100kΩ value is suggested.
IMP1834A
10kΩ
1
2
The IMP1834A open drain reset outputs require pull-up resistors
and must be low enough in value to pull the output into a HIGH
state. Resistor value is not critical in most applications and a value
of 10kΩ is suggested. See Figure 5 and Figure 6.
The IMP1834A open drain reset outputs can be connected to the
same potential through a single pull up resistor. In this configuration a failure on either supply will generate an active LOW reset.
If the outputs are pulled-up to different voltages, the reset outputs
(pin 2 and pin 7) should not be connected. See Figure 7.
3.3V
5V
3
4
5VIN
3.3VIN
5VRESET 3.3VRESET
5VTOL
3.3VTOL
GND
PBRST
10kΩ
7
6
5
1834_07.eps
Figure 6. IMP1834A Open Drain Output Pull-Up Resistor
5V
3.3V
5V or 3.3V
IMP1834A
µP
Input
RESET
8
1
100kΩ
2
1834_06.eps
3
4
Figure 5. IMP1834 RESET Valid to 0V
5VIN
3.3VIN
5VRESET 3.3VRESET
5VTOL
GND
3.3VTOL
PBRST
8
10kΩ
7
6
5
1834_08.eps
Figure 7. IMP1834A Wired “OR” Connection
6
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© 1999 IMP, Inc.
IMP183 4/A/D
Package
Dimensions
Absolute
Maximum
Ratings
MicroSO (8-Pin)
Inches
Millimeters
Min
a
Max
Min
Max
MicroSO (8-Pin)*
+
E1 E
L
D
C
A2
D
A
e
b
0.10mm
0.004in
MicroSO (8-Pin).eps
A
A1
A2
b
C
D
e
E
E1
L
a
–––––
0.0433
0.0020
0.0059
0.0295
0.0374
0.0098
0.0157
0.0051
0.0091
0.1142
0.1220
0.0256 BSC
0.193 BSC
0.1142
0.1220
0.0157
0.0276
0°
6°
A
A1
B
C
e
E
H
L
D
0.053
0.004
0.013
0.007
A1
––––
1.10
0.050
0.15
0.75
0.95
0.25
0.40
0.13
0.23
2.90
3.10
0.65 BSC
4.90 BSC
2.90
3.10
0.40
0.70
0°
6°
SO (8-Pin)**
SO (8-Pin)
0°– 8°
L
H
E
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
Plastic DIP (8-Pin)***
C
D
A
e
B
A1
SO (8-Pin).eps
Plastic DIP (8-Pin)
D1
E
D
E1
A A2
L A1
A
–––––
0.210
A1
0.015
–––––
A2
0.115
0.195
b
0.014
0.022
b2
0.045
0.070
b3
0.030
0.045
D
0.355
0.400
D1
0.005
–––––
E
0.300
0.325
E1
0.240
0.280
e
0.100
–––––
eA
0.300
–––––
eB
–––––
0.430
eC
–––––
0.060
L
0.115
0.150
*** JEDEC Drawing MO-187AA
*** JEDEC Drawing MS-112AA
*** JEDEC Drawing MS-001BA
––––
0.38
2.92
0.36
1.14
0.80
9.02
0.13
7.62
6.10
5.33
–––––
4.95
0.56
1.78
1.14
10.16
–––––
8.26
7.11
2.54
7.62
–––––
10.92
2.92
3.81
1834_t04.at3
0°–15°
e
C
b2
b
eA
eB
Plastic DIP (8-Pin)a.eps
© 1999 IMP, Inc.
408-432-9100/www.impweb.com
7
IMP183 4/A/D
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
Fax-on-Demand: 1-800-249-1614 (USA)
Fax-on-Demand: 1-303-575-6156 (International)
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.
© 1999 IMP, Inc.
Printed in USA
Publication #: 1009
Revision:
A
Issue Date:
07/02/99
Type:
Preliminary
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