M
FEATURES
MCP120/130
PACKAGES
TO-92 with
‘D’ Bondout
TO-92 with
‘F’ Bondout
Microcontroller Supervisory Circuit with Open Drain Output
• Holds microcontroller in reset until supply voltage
reaches stable operating level
• Resets microcontroller during power loss
• Precision monitoring of 3V, 3.3V, and 5V systems
• 7 voltage trip points available
• Active low RESET pin
• Open drain output
• Internal pullup resistor (5KΩ) for MCP130
• Holds RESET for 350 ms (typical)
• Guaranteed RESET to V
CC
= 1.0V
• Accuracy of ±125mV for 5V systems and ±75mV
for 3V systems over temperature
• 45 µA typical operating current
• Temperature range:
- Industrial (I): -40°C to +85°C
RST
V
DD
V
SS
V
SS
RST
V
DD
MCP120
MCP130
MCP130
MCP120 not offered in
this pinout
TO-92 with
‘G’ Bondout
TO-92 with
‘H’ Bondout
DESCRIPTION
The Microchip Technology Inc. MCP120/130 is a volt-
age supervisory device designed to keep a microcon-
troller in reset until the system voltage has reached the
proper level and stabilized. It also operates as protec-
tion from brown-out conditions when the supply voltage
drops below a safe operating level. Both devices are
available with a choice of seven different trip voltages
and both have open drain outputs. The MCP130 has an
internal 5KΩ pullup resistor. Both devices have active
low RESET pins. The MCP120/130 will assert the
RESET signal whenever the voltage on the V
DD
pin is
below the trip-point voltage.
V
DD
V
SS
RST
V
DD
RST
V
SS
MCP120
MCP130 not offered in
this pinout
MCP120
MCP130
SOT-23-3
150mil SOIC
1
2
3
4
8
7
6
5
RST
V
SS
V
DD
RST
V
DD
NC
V
SS
NC
NC
NC
NC
MCP120
MCP130
MCP120
MCP130
BLOCK DIAGRAM
V
DD
5KΩ internal
pull-up on
MCP130 only
comparator
+
-
Delay
Circuit
Output
Driver
RESET
Bandgap
Reference
©
1999 Microchip Technology Inc.
Preliminary
DS11184C-page 1
MCP120/130
1.0
1.1
ELECTRICAL CHARACTERISTICS
Maximum Ratings*
*Notice:
Stresses above those listed under “Maximum
Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of
the device at those or any other conditions above those
indicated in the operational listings of this specification
is not implied. Exposure to maximum rating conditions
for extended periods may affect device reliability.
V
DD
..................................................................................7.0V
All inputs and outputs w.r.t. V
SS
............... -0.6V to V
DD
+1.0V
Storage temperature ..................................... -65˚C to +150˚C
Ambient temp. with power applied ................ -65˚C to +125˚C
Soldering temperature of leads (10 seconds) ............. +300˚C
ESD protection on all pins
..................................................≥
2 kV
DC AND AC CHARACTERISTICS
All parameters apply at the
specified temp and voltage
ranges unless otherwise noted.
PARAMETER
Operating Voltage Range
V
DD
Value to Guarantee RESET
Operating Current
MCP1X0-270
MCP1X0-300
MCP1X0-315
MCP1X0-450
MCP1X0-460
MCP1X0-475
MCP1X0-485
MCP1X0-270
MCP1X0-300
MCP1X0-315
MCP1X0-450
MCP1X0-460
MCP1X0-475
MCP1X0-485
MCP130-XXX
(All V
TRIP
Points)
V
OL
V
DD
= 1.0 - 5.5V
Industrial (I):-40°C to +85°C
SYMBOL
V
DD
V
DD
MIN
I
DD
2.55
2.85
3.0
4.25
4.35
4.50
4.60
MIN
1.0
1.0
45
2.625
2.925
3.075
4.375
4.475
4.625
4.725
60
2.7
3.0
3.15
4.50
4.60
4.75
4.85
0.4
TYP
MAX
5.5
UNITS
V
V
µA
V
V
DD
= 5.5V (no load)
TEST CONDITIONS
V
DD
Trip Point
V
TRIP
V
RESET Low
Level Output
Voltage
I
OL
= 3.2mA,
V
DD
= V
TRIP
MIN
I
OL
= 8.5mA,
V
DD
= V
TRIP
MIN
0.6
RESET High
Level Output
Voltage
(MCP130 Only)
V
DD
-0.7
V
OH
V
I
OH
= 50µA,V
DD
> V
TRIP
MAX
Pullup Resistor (MCP130 Only)
Output Leakage (MCP120 Only)
Threshold Hysteresis
V
DD
Detect to RESET Inactive
V
DD
Detect to RESET
V
HYS
t
RPU
t
RPD
150
5
1
50
350
10
700
kΩ
µA
mV
ms
µs
V
DD
ramped from V
TRIP
MAX
+
250mV down to V
TRIP
MIN
-
250mV
Note:
Typical values are for 25˚C and V
DD
= 5.0V
©
1999 Microchip Technology Inc.
Preliminary
DS11184C-page 2
MCP120/130
V
TRIP
V
DD
t
RPU
t
RPD
RESET
V
OH
V
OH
FIGURE 1:
MCP120/130 Timing Diagram
2.0
2.1
APPLICATIONS INFORMATION
The Need for Supervisory Circuits
5V
SUPPLY VOLTAGE
V
TRIP
MAX
V
TRIP
MIN
(V
TRIP
MIN
-
V
DD
)
T
RANSIENT
D
URATION
For many of today’s microcontroller applications, care
must be taken to prevent low power conditions that can
cause many different system problems. The most com-
mon causes are brown-out conditions where the sys-
tem supply drops below the operating level momentar-
ily, and the second, is when a slowly decaying power
supply causes the microcontroller to begin executing
instructions without enough voltage to sustain SRAM
and producing indeterminate results.
V
DD
MICROCONTROLLER
bypass
capacitor
0
0
TIME
V
DD
10
MCP130
V
SS
T
A
= +25°C
TRANSIENT DURATION (µS)
V
DD
RST
MCLR
OR
RESET
8
6
Transients above the
curve will cause a reset
4
V
SS
2
Transients below
the curve will NOT
cause a reset
0
0
1
2
3
4
5
FIGURE 2-1:
Typical Application
2.2
Negative Going V
DD
Transients
V
TRIP
- V
DD
(V)
Many system designers implementing POR circuits are
concerned about the minimum pulse width required to
cause a reset. Figure 2-2 shows typical transient
voltage below the trip point (V
TRIP
- V
DD
) vs. transient
duration. It shows that the farther below the trip point
the transient pulse goes, the duration of the pulse
required to cause a reset gets shorter. A 0.1 µF bypass
cap mounted as close as possible to the V
DD
pin pro-
vides additional transient immunity.
FIGURE 2-2:
Typical Transient Response
©
1999 Microchip Technology Inc.
Preliminary
DS11184C-page 3
MCP120/130
2.3
NORMALIZED THRESHOLD* (V
TRIP
)
Effect of Temperature on Timeout
Period (t
RPU
)
1.002
The timeout period (t
RPU
) determines how long the
device remains in the reset condition. This is controlled
by an internal RC timer and is effected by both V
DD
and
temperature. The graph shown in Figure 2-3 shows
typical response for different V
DD
values and tempera-
tures.
1.000
0.998
0.996
0.994
700
0.992
TIMEOUT PERIOD (T
RPU
) (mS)
600
V
DD
= 6V
500
V
DD
= 5V
400
0.997
-40
-20
0
20
40
60
80
100
TEMPERATURE (˚C)
* Multiply value at 25˚C by this factor to
determine the value at temperature
300
V
DD
= 4V
200
V
DD
= 3V
FIGURE 2-5:
Normalized V
TRIP
vs. Temperature
800
100
-40
V
DD
= 2.5V
-20
0
20
40
60
80
100
700
V
DD
= 1.5V
600
V
OL
(mV)
V
DD
= 3.5V
TEMPERATURE (˚C)
FIGURE 2-3:
t
RPU
vs. Temperature
500
400
300
V
DD
= 4.5V
60
V
DD
= 5V
V
DD
= 5.5V
200
100
T
A
= +25°C
0
0
2
4
6
8
10
I
OL
12 14
(mA)
16
18
20
50
Operating Current (µA)
40
30
V
DD
= 4V
20
V
DD
= 3V
FIGURE 2-6:
V
OL
vs. I
OL
10
1.3
0
-40
-20
0
20
40
60
80
100
1.2
TEMPERATURE (˚C)
1.1
NORMALIZED I
OL
*
FIGURE 2-4:
I
DD
vs. Temperature
1.00
0.9
0.8
0.7
-40
-20
0
20
40
60
80
100
TEMPERATURE (˚C)
* Multiply value at 25˚C by this factor to
determine the value at temperature
FIGURE 2-7:
Normalized I
OL
vs. Temperature
DS11184C-page 4
Preliminary
©
1999 Microchip Technology Inc.
MCP120/130
MCP120/130 PRODUCT IDENTIFICATION SYSTEM
MCP120/130
— xxx b I /pp
Package
Temperature
Range
Bondout
Option
(TO-92 only)
TO = TO-92 (3-lead) [offered in bags only]
TT = SOT-23 (3-lead) [offered in tape & reel only]
SN = SOIC (8-lead, 150 mil Body)
I = –40˚C to +85˚C (only offered in I)
D
F
G
H
270
300
315
450
460
475
485
=
=
=
=
=
=
=
=
=
=
=
D Bond Option (see bond option diagrams)
F Bond Option
G Bond Option
H Bond Option
2.55
≤
V
TRIP
≤
2.70
2.85
≤
V
TRIP
≤
3.00
3.00
≤
V
TRIP
≤
3.15
4.25
≤
V
TRIP
≤
4.50
4.35
≤
V
TRIP
≤
4.60
4.50
≤
V
TRIP
≤
4.75
4.60
≤
V
TRIP
≤
4.85
RESET V
TRIP
Voltage
Device
MCP120 = Supervisor circuit with open drain output.
MCP120T = Supervisor circuit with open drain output
(tape & reel).
MCP130 = Supervisor circuit with open drain output and
internal pullup resistor.
MCP130T = Supervisor circuit with open drain output and
internal pullup resistor (tape & reel).
Product Identification Options for MCP120/130
TO-92 with
‘D’ Bondout
TO-92 with
‘F’ Bondout
TO-92 with
‘G’ Bondout
TO-92 with
‘H’ Bondout
SOT-23-3
150mil SOIC
RST
RST
V
DD
V
SS
V
SS
V
DD
V
DD
RST
V
DD
RST
MCP120-XXXH I/TO
MCP130-XXXH I/TO
MCP120-XXX I/TT
MCP130-XXX I/TT
V
DD
V
SS
V
SS
RST
V
DD
NC
V
SS
1
2
3
4
8
7
6
5
NC
NC
NC
NC
MCP120-XXXD I/TO
MCP130-XXXD I/TO
V
SS
RST
MCP130-XXXF I/TO MCP120-XXXG I/TO
MCP120 not offered MCP130 not offered
in this pinout
in this pinout
MCP120-XXX I/SN
MCP130-XXX I/SN
Example of Product Identification:
For the MCP130 (open drain output with internal pull up resistor) with
V
TRIP
range of 2.55V - 2.70V in T0-92 package with ‘F’ bond option in
industrial temp range, the part number would be: MCP130-270F I/TO.
Sales and Support
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-
mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1. Your local Microchip sales office
2. The Microchip Corporate Literature Center U.S. FAX: (602) 786-7277
3. The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
New Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
©
1999 Microchip Technology Inc.
Preliminary
DS11184C-page 5
Embedded System
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