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PDF FM1233B Data sheet ( Hoja de datos )
| Número de pieza | FM1233B | |
| Descripción | 3-Pin C Supervisor Circuit | |
| Fabricantes | Fairchild Semiconductor | |
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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 5kΩ pull-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
1 page  
Ordering Information
Part
Number
FM1233BFS3X
FM1233BDS3X
FM1233BES3X
Top
Marking
3BF
3BD
3BE
RESET
Threshold (V)
4.62
4.38
4.12
Output Type
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Package
Type
3-Pin, SOT23
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
3000 units in T&R
FM1233B Rev. D
5 www.fairchildsemi.com
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet FM1233B.PDF ] | |
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