MCP121

Features:

• Ultra low supply current: 1.75 A (steady state max.)
• Precision monitoring options of:
- 1.90V, 2.32V, 2.63V, 2.93V, 3.08V, 4.38V and 4.63V
• Resets microcontroller in a power-loss event
•RST pin (Active-low):
- MCP121: Active-low, open-drain
- MCP131: Active-low, open-drain with internal pull-up resistor
- MCP102 and MCP103: Active-low, push-pull
• Reset Delay Timer (120 ms delay typical)
• Available in SOT23-3, TO-92 and SC70 packages
• Temperature Range:
- Extended: -40°C to +125°C
(except MCP1XX-195)
- Industrial: -40°C to +85°C (MCP1XX-195 only)
• Lead Free Packaging

Application

• Critical Microcontroller and Microprocessor Power Monitoring Applications
• Computers
• Intelligent Instruments
• Portable Battery-Powered Equipment




Pinout






Specifications

Parameter NameValueManual ResetNoWatchdog TimerNoTypical Reset Pulse Width (ms)120Reset TypeActive Low Typical Supply Current (uA)1Vcc Range Min (V)1Vcc Range Max (V)5.5OutputOpen-DrainTemp Range Min. (°C)-40Temp Range Max. (°C)125Nominal Reset Voltage (V)1.87, 2.29, 2.59, 2.86, 2.87, 3.03, 4.31, 4.56

Parameter Name	Value
Manual Reset	No
Watchdog Timer	No
Typical Reset Pulse Width (ms)	120
Reset Type	Active Low
Typical Supply Current (uA)	1
Vcc Range Min (V)	1
Vcc Range Max (V)	5.5
Output	Open-Drain
Temp Range Min. (°C)	-40
Temp Range Max. (°C)	125
Nominal Reset Voltage (V)	1.87, 2.29, 2.59, 2.86, 2.87, 3.03, 4.31, 4.56

Absolute Maximum Ratings†

V_DD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.0V
Input current (V_DD) . . . . . . . . . . . . . . . . . . . . . . . . . . .10 mA
Output current (RST) . . . . . . . . . . . . . . . . . . . . . . . . . .10 mA
Rated Rise Time of V_DD . . . . . . . . . . . . . . . . . . . . . . 100V/s
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 . . . . .40°C to + 125°C
Maximum Junction temp. with power applied . . . . . . ..150°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.

Description

The MCP121 Series of CMOS voltage detectors are well suited for many portable and consumer electrics applications due to the extremely low 1uA operating current and small surface-mount packaging. These devices are designed to hold the microcontroller in reset until the supply voltage reaches a predetermined operating level. These devices also protect against brownout conditions that occur as a result of the supply voltage dropping below a tolerable level.

The MCP121 Series of CMOS voltage detectors are well suited for many portable and consumer electrics applications due to the extremely low 1uA operating current and small surface-mount packaging. These devices are designed to hold the microcontroller in reset until the supply voltage reaches a predetermined operating level. These devices also protect against brownout conditions that occur as a result of the supply voltage dropping below a tolerable level.

The MCP102/103/121/131 are voltage supervisor devices designed to keep a microcontroller in reset until the system voltage has reached and stabilized at the proper level for reliable system operation. The table below shows the available features for these devices.