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FM1233B Schematic ( PDF Datasheet ) - Fairchild Semiconductor

Teilenummer FM1233B
Beschreibung 3-Pin C Supervisor Circuit
Hersteller Fairchild Semiconductor
Logo Fairchild Semiconductor Logo 




Gesamt 6 Seiten
FM1233B Datasheet, Funktion
February 2003
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 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 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.
Features
s Precision monitoring of 5V and lower voltage microprocessor
systems
s VTH values of 4.62V, 4.38V and 4.12V
s Automatic restart of microprocessor after power failure
s 140ms (min) power-on RESET delay (typ.: 256ms)
s Internal 5kpull-up resistor
s Other reset choices available: 32 to 128ms
s Operating Temperature -40°C to +105°C
s Monitors external pushbutton override
s Internal switch debounce circuitry
s SOT23-3 package
Typical Operating Circuit
VCC
GND
Connection Diagram
3
FM1233B
12
RESET
Controller
GND 1
FM1233B 3 VCC
RESET 2
SOT23-3 Package
©2002 Fairchild Semiconductor Corporation
FM1233B Rev. D
1
www.fairchildsemi.com






FM1233B Datasheet, Funktion
Physical Dimensions inches (millimeters) unless otherwise noted
0.021
0.015
0.055 0.098
0.047 0.083
0.120
0.105
0.079
0.071
0.040
0.031
0.004
0.001
PKG
CL
0.0059
0.0035
0.010
0.005
0-8˚
0.76
0.95
LAND PATTERN RECOMMENDATION
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:
1. 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 signicant
injury to the user.
1. 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.
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FM1233B Rev. D
6 www.fairchildsemi.com

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