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1999 Microchip Technology Inc. Preliminary DS11187D-page 1
MCP100/101
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 V
DD
= 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
V
DD
pin is below the trip-point voltage.
PACKAGES
BLOCK DIAGRAM
V
SS
V
DD
RST
VSS
V
DD
MCP100
MCP101
MCP100
MCP101
V
SS
V
DD
MCP100
MCP101
TO-92 with
‘D’ Bondout
TO-92 with
‘H’ Bondout
SOT-23-3
RST
OR
RST
RST
OR
RST
RST
OR
Bandgap
Reference
Delay
Circuit
Output
Driver
RESET
V
DD
+
-
Comparator
RESET
or
Microcontroller Supervisory Circuit with Push-Pull Output
11187d.book Page 1 Friday, September 10, 1999 8:52 AM
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