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PDF FM1233D Data sheet ( Hoja de datos )
| Número de pieza | FM1233D | |
| Descripción | 3-Pin C Supervisor Circuit | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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February 2003
FM1233D
3-Pin µC Supervisor Circuit
General Description
The FM1233D 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 FM1233D is of open-drain
active low type.
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 SOT23-3 package
Typical Operating Circuit
VCC
GND
Connection Diagram
3
FM1233D
12
RESET
Controller
GND 1
FM1233D 3 VCC
RESET 2
SOT23-3 Package
©2002 Fairchild Semiconductor Corporation
FM1233D Rev. D
1
www.fairchildsemi.com
1 page  
General Description
The FM1233D features a highly accurate voltage reference to
which VCC is compared. Once VCC is below the specified
threshold, it will drive the RESET line and continue to hold it low
until VCC returns above the threshold and the time for the
RESET pulse duration has expired. The FM1233D is immune to
short negative going transients on the VCC line. The placement
of a 0.1µF bypass capacitor as close as possible to the VCC pin
provides additional transient immunity.
For a VCC value below 1.0V, the FM1233D does not sink very
much current on the RESET pin. This is not a problem in most
systems since common devices are not functional in this range.
If it is desired for the FM1233D reset to be functional below this
range, use a 100KΩ pull-down resistor between RESET and
VSS.
FM1233D Rev. D
5 www.fairchildsemi.com
5 Page | ||
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