FM1233ADS3X

FM1233ADS3X Datasheet

FM1233A 3-Pin µC Supervisor Circuit

Part	Datasheet
FM1233ADS3X	FM1233ADS3X (pdf)

Related Parts	Information
FM1233ACS3X	FM1233ACS3X

PDF Datasheet Preview
FM1233A 3-Pin µC Supervisor Circuit November 2001 FM1233A 3-Pin µC Supervisor Circuit The FM1233A is a supervisor circuit that monitors a microprocessor power supply or other system voltage and issues a reset pulse when a fault condition exists. Several different threshold voltages are offered to accommodate 3V systems with different tolerances. The device features a precision temperature-compensated voltage reference and comparator. When VCC falls to the threshold voltage, a RESET pulse is issued, holding the output in the active state. When power rises above VTH, the reset remains for approximately 250 ms to allow the system clock and other circuits to stabilize. The reset output of FM1233A is of open-drain active low type. The FM1233A also can monitor a switch closure on its output, enabling it to recognize an external reset from a pushbutton switch or a µP. In the case of a switch, the closure will be debounced by circuitry internal to the FM1233A. Typical Operating Circuit I Precision monitoring of 3.3V and lower voltage microprocessor systems I VTH values of 2.88V, 2.72V I Automatic restart of microprocessor after power failure I 140ms min power-on RESET delay typ. 256ms I Internal pull-up resistor I Other reset choices available 32 to 128ms I Operating Temperature -40°C to +105°C I Monitors external pushbutton override I Internal switch debounce circuitry I SOT23-3 package FM1233A Controller /RESET Connection Diagram GND 1 FM1233A 3 VCC /RESET 2 SOT23-3 Package 2001 Fairchild Semiconductor Corporation FM1233A 3-Pin µC Supervisor Circuit Absolute Maximum Ratings Voltage on any pin relative to GND VCC /RESET Input Current Output Current /RESET -0.3V to +6.0V -0.3V to VCC + 0.3V 20mA 20mA Continuous Power Dissipation TA = 70°C SOT23 derate 4mW above 70°C Operating Temperature Range Storage Temperature Range Lead Temperature soldering, 10s 300mW -40°C to +105°C -65°C to +150°C +300°C These are stress ratings only, and functional operation is not implied for these levels or beyond. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Electrical Characteristics VCC = 3.3V TA = -40°C to +105°C unless otherwise noted Note 1 Parameter Symbol Conditions Max Units Operating Voltage Supply Current Reset Threshold Reset Threshold Reset Output Voltage Reset Output Voltage Reset Timeout Period Pushbutton Detect Pushbutton Release VCC ICC VTH VOH tRST PBVDET PBVREL Ordering Information FM1233ACS3X FM1233ADS3X Top Marking 3AC 3AD RESET Threshold V Output Type Open-Drain, active LOW Open-Drain, active LOW Package Type 3-Pin, SOT23 3-Pin, SOT23 Note 3 Devices listed above feature 250ms typical reset pulse width. Consult Fairchild Sales for other reset pulse width options. Packing Method 3000 units in T&R 3000 units in T&R FM1233A 3-Pin µC Supervisor Circuit Physical Dimensions inches millimeters unless otherwise noted 0.97REF 0.508REF SOT-23 Package Dimensions FS Pkg Code AU Life Support Policy Fairchild's products are not authorized for use as critical components in life support devices or systems without the express written approval of the President of Fairchild Semiconductor Corporation. As used herein: Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. Fairchild Semiconductor Americas Customer Response Center Tel. 1-888-522-5372 Fairchild Semiconductor Europe Fax +44 0 1793-856858 Deutsch Tel +49 0 8141-6102-0 English Tel +44 0 1793-856856 Français Tel +33 0 1-6930-3696 Italiano Tel +39 0 2-249111-1 Fairchild Semiconductor Hong Kong 8/F, Room 808, Empire Centre 68 Mody Road, Tsimshatsui East Kowloon. Hong Kong Tel +852-2722-8338 Fax +852-2722-8383 Fairchild Semiconductor Japan Ltd. 4F, Natsume Bldg. 2-18-6, Yushima, Bunkyo-ku Tokyo, 113-0034 Japan Tel 81-3-3818-8840 Fax 81-3-3818-8841 Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.

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FM1233A 3-Pin µC Supervisor Circuit

November 2001

FM1233A 3-Pin µC Supervisor Circuit

The FM1233A is a supervisor circuit that monitors a microprocessor power supply or other system voltage and issues a reset pulse when a fault condition exists. Several different threshold voltages are offered to accommodate 3V systems with different tolerances.

The device features a precision temperature-compensated voltage reference and comparator. When VCC falls to the threshold voltage, a RESET pulse is issued, holding the output in the active state. When power rises above VTH, the reset remains for approximately 250 ms to allow the system clock and other circuits to stabilize. The reset output of FM1233A is of open-drain active low type.

The FM1233A also can monitor a switch closure on its output, enabling it to recognize an external reset from a pushbutton switch or a µP. In the case of a switch, the closure will be debounced by circuitry internal to the FM1233A.

Typical Operating Circuit

I Precision monitoring of 3.3V and lower voltage microprocessor systems

I VTH values of 2.88V, 2.72V I Automatic restart of microprocessor after power failure I 140ms min power-on RESET delay typ. 256ms I Internal pull-up resistor I Other reset choices available 32 to 128ms I Operating Temperature -40°C to +105°C I Monitors external pushbutton override I Internal switch debounce circuitry I SOT23-3 package

FM1233A

Controller
/RESET

Connection Diagram

GND 1 FM1233A 3 VCC
/RESET 2

SOT23-3 Package
2001 Fairchild Semiconductor Corporation

FM1233A 3-Pin µC Supervisor Circuit

Absolute Maximum Ratings

Voltage on any pin relative to GND VCC /RESET

Input Current

Output Current /RESET
-0.3V to +6.0V -0.3V to VCC + 0.3V
20mA
20mA

Continuous Power Dissipation TA = 70°C SOT23 derate 4mW above 70°C

Operating Temperature Range

Storage Temperature Range

Lead Temperature soldering, 10s
300mW -40°C to +105°C -65°C to +150°C
+300°C

These are stress ratings only, and functional operation is not implied for these levels or beyond. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability.

Electrical Characteristics VCC = 3.3V TA = -40°C to +105°C unless otherwise noted Note 1

Parameter Symbol

Conditions

Max Units

Operating Voltage Supply Current Reset Threshold Reset Threshold Reset Output Voltage

Reset Output Voltage

Reset Timeout Period Pushbutton Detect Pushbutton Release

VCC ICC VTH VOH
tRST PBVDET PBVREL
Ordering Information

FM1233ACS3X FM1233ADS3X

Top Marking
3AC 3AD

RESET Threshold V

Output Type

Open-Drain, active LOW Open-Drain, active LOW

Package Type
3-Pin, SOT23 3-Pin, SOT23

Note 3 Devices listed above feature 250ms typical reset pulse width. Consult Fairchild Sales for other reset pulse width options.

Packing Method
3000 units in T&R 3000 units in T&R

FM1233A 3-Pin µC Supervisor Circuit

Physical Dimensions inches millimeters unless otherwise noted
0.97REF
0.508REF

SOT-23 Package Dimensions FS Pkg Code AU

Life Support Policy

Fairchild's products are not authorized for use as critical components in life support devices or systems without the express written approval of the President of Fairchild Semiconductor Corporation. As used herein:

Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.

A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

Fairchild Semiconductor Americas Customer Response Center Tel. 1-888-522-5372

Fairchild Semiconductor Europe

Fax +44 0 1793-856858 Deutsch Tel +49 0 8141-6102-0 English Tel +44 0 1793-856856 Français Tel +33 0 1-6930-3696 Italiano Tel +39 0 2-249111-1

Fairchild Semiconductor Hong Kong 8/F, Room 808, Empire Centre 68 Mody Road, Tsimshatsui East Kowloon. Hong Kong Tel +852-2722-8338 Fax +852-2722-8383

Fairchild Semiconductor Japan Ltd. 4F, Natsume Bldg. 2-18-6, Yushima, Bunkyo-ku Tokyo, 113-0034 Japan Tel 81-3-3818-8840 Fax 81-3-3818-8841

Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.

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Datasheet ID: FM1233ADS3X 514870