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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP100 Datasheet

Microcontroller Supervisory Circuit with Push-Pull Output

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MCP100 pdf
MCP100/101
Microcontroller Supervisory Circuit with Push-Pull Output
FEATURES
• 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 (MCP100) or active high
RESET (MCP101)
• Push-pull output
• Holds RESET/RESET for 350 ms (typical)
• Guaranteed RESET/RESET to VDD = 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
DESCRIPTION
The Microchip Technology Inc. MCP100/101 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 push-pull outputs. The MCP100 has a
low active RESET pin and the MCP101 has a high
active RESET pin. The MCP100/101 will assert the
RESET/RESET signal whenever the voltage on the
VDD pin is below the trip-point voltage.
PACKAGES
TO-92 with
‘D’ Bondout
RST
OR
RSTVDD
VSS
MCP100
MCP101
TO-92 with
‘H’ Bondout
VDD
VSS
RST
OR
RST
MCP100
MCP101
SOT-23-3
RST
OR
RST
VDD
VSS
MCP100
MCP101
BLOCK DIAGRAM
VDD
Comparator
+
-
Delay
Circuit
Bandgap
Reference
Output
Driver
RESET
or
RESET
© 1999 Microchip Technology Inc.
Preliminary
DS11187D-page 1



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP100 Datasheet

Microcontroller Supervisory Circuit with Push-Pull Output

No Preview Available !

MCP100 pdf
MCP100/101
1.0 ELECTRICAL CHARACTERISTICS
1.1 Maximum Ratings*
VDD ..................................................................................7.0V
All inputs and outputs w.r.t. VSS............... -0.6V to VDD +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
*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.
DC AND AC CHARACTERISTICS
All parameters apply at the specified
temp and voltage ranges unless oth-
erwise noted.
VDD = 1.0 - 5.5V
Industrial (I):-40°C to +85°C
PARAMETER
SYMBOL MIN TYP MAX UNITS
TEST CONDITIONS
Operating Voltage Range
VDD Value to Guarantee RESET/
RESET
Operating current
VDD Trip Point
MCP10X-270
MCP10X-300
MCP10X-315
MCP10X-450
MCP10X-460
MCP10X-475
MCP10X-485
RESET Low Level
Output Voltage
(MCP100)
MCP100-270
MCP100-300
MCP100-315
MCP100-450
MCP100-460
MCP100-475
MCP100-485
RESET High Level MCP100-XXX
Output Voltage
(MCP100)
(All VTRIP Points)
RESET Low Level
Output Voltage
(MCP101)
MCP101-270
MCP101-300
MCP101-315
MCP101-450
MCP101-460
MCP101-475
MCP101-485
RESET High level MCP101-XXX
Output Voltage
(MCP101)
(All VTRIP Points)
Threshold Hysteresis
VDD Detect to RESET/RESET Inactive
VDD Detect to RESET/RESET
VDD
VDDMIN
IDD
VTRIP
VOL
VOH
VOL
VOH
VHYS
tRPU
tRPD
1.0 5.5
1.0
2.55
2.85
3.0
4.25
4.35
4.50
4.60
45 60
2.625
2.925
3.075
4.375
4.475
4.625
4.725
2.7
3.0
3.15
4.50
4.60
4.75
4.85
0.4
0.6
VDD-0.7
0.4
0.6
VDD-0.7
50
150 350 700
10
V
V
µA VDD = 5.5V (no load)
V
V IOL = 3.2mA, VDD = VTRIPMIN
IOL = 8.5mA, VDD = VTRIPMIN
V IOH = 3mA,VDD > VTRIPMAX
V IOL = 3.2mA, VDD > VTRIPMAX
IOL = 8.5mA, VDD > VTRIPMAX
V IOH = 3mA,VDD = VTRIPMIN
mV
ms
µs VDD ramped from VTRIPMAX +
250mV down to VTRIPMIN -
250mV
DS11187D-page 2
Preliminary
© 1999 Microchip Technology Inc.



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP100 Datasheet

Microcontroller Supervisory Circuit with Push-Pull Output

No Preview Available !

MCP100 pdf
MCP100/101
VDD
VTRIP
tRPU
RESET
(MCP100)
VOH
RESET
(MCP101)
VOL
tRPD
VOL
FIGURE 1-1: MCP100/101 Timing Diagram
2.0 APPLICATIONS INFORMATION
2.1 The Need for Supervisory Circuits
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
momentarily, and the second, is when a slowly decay-
ing power supply causes the microcontroller to begin
executing instructions without enough voltage to sus-
tain SRAM and producing indeterminate results.
VDD
MCP100
bypass
capacitor
VSS
VDD
RST
MICROCONTROLLER
VDD
MCLR
OR
RESET
VSS
FIGURE 2-1: Typical Application
2.2 Negative Going VDD Transients
Many system designers implementing POR circuits are
concerned about the minimum pulse width required to
cause a reset. Figure 2-2 shows typical transient dura-
tion vs. reset comparator overdrive for which the
MCP100/101 will not generate a reset pulse. 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 VDD pin provides additional
transient immunity.
5V
TRANSIENT
DURATION
0
0
VTRIPMAX
VTRIPMIN
(VTRIPMIN - VDD)
TIME
10
TA = +25°C
8
6
Transients above the
4 curve will cause a reset
2
Transients below
the curve will NOT
cause a reset
0
01
2
3
VTRIP - VDD (V)
4
5
FIGURE 2-2: Typical Transient Response
© 1999 Microchip Technology Inc.
Preliminary
DS11187D-page 3




Part Number MCP100
Description Microcontroller Supervisory Circuit with Push-Pull Output
Maker Microchip Technology
Total Page 8 Pages
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