FM1233BDS3X FAIRCHILD [Fairchild Semiconductor], FM1233BDS3X Datasheet

no-image

FM1233BDS3X

Manufacturer Part Number
FM1233BDS3X
Description
3-Pin ?C Supervisor Circuit
Manufacturer
FAIRCHILD [Fairchild Semiconductor]
Datasheet
©2002 Fairchild Semiconductor Corporation
FM1233B Rev. D
FM1233B
3-Pin µC Supervisor Circuit
General Description
The FM1233B is a supervisor circuit that monitors a micropro-
cessor power supply or other system voltage and issues a reset
pulse when a fault condition exists. Several different threshold
voltages are offered to accommodate 5V systems with different
tolerances.
The device features a precision temperature-compensated volt-
age reference and comparator. When V
voltage, a RESET pulse is issued, holding the output in the
active state. When power rises above V
approximately 250 ms to allow the system clock and other cir-
cuits to stabilize. The reset output of FM1233B is of open-drain
active low type.
The FM1233B 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 FM1233B.
Typical Operating Circuit
Connection Diagram
GND
VCC
RESET
TH
CC
GND
, the reset remains for
falls to the threshold
FM1233B
1
1
2
SOT23-3 Package
3
FM1233B
2
1
RESET
Features
Precision monitoring of 5V and lower voltage microprocessor
systems
V
Automatic restart of microprocessor after power failure
140ms (min) power-on RESET delay (typ.: 256ms)
Internal 5k pull-up resistor
Other reset choices available: 32 to 128ms
Operating Temperature -40°C to +105°C
Monitors external pushbutton override
Internal switch debounce circuitry
SOT23-3 package
TH
values of 4.62V, 4.38V and 4.12V
3
VCC
Controller
February 2003
www.fairchildsemi.com

Related parts for FM1233BDS3X

FM1233BDS3X Summary of contents

Page 1

FM1233B 3-Pin µC Supervisor Circuit General Description The FM1233B is a supervisor circuit that monitors a micropro- cessor power supply or other system voltage and issues a reset pulse when a fault condition exists. Several different threshold voltages are offered ...

Page 2

Absolute Maximum Ratings Votage on any pin relative to GND V CC RESET Input Current Output Current (RESET) These are stress ratings only, and functional operation is not implied for these levels or beyond. Exposure to Absolute Maximum Rating conditions ...

Page 3

Pin Descriptions Pin Number Circuit Timing When operating properly with also be about 5V. When V starts to fall, RESET will follow it CC down as shown. When V drops below V CC ground ...

Page 4

General Description The FM1233B features a highly accurate voltage reference to which V is compared. Once threshold, it will drive the RESET line and continue to hold it low until V returns above the threshold and the ...

Page 5

... Ordering Information Part Top Number Marking FM1233BFS3X 3BF FM1233BDS3X 3BD FM1233BES3X 3BE Note 3 : Devices listed above feature 250ms typical reset pulse width. Consult Fairchild Sales for other reset pulse width options. FM1233B Rev. D RESET Threshold (V) Output Type 4.62 Open-Drain, active LOW 4.38 Open-Drain, active LOW 4 ...

Page 6

Physical Dimensions inches (millimeters) unless otherwise noted 0.021 0.015 0.120 0.105 0.079 0.071 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 ...

Related keywords