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FM1233ABAS3X View Datasheet(PDF) - Fairchild Semiconductor

Part Name
Description
View to exact match
FM1233ABAS3X
Fairchild
Fairchild Semiconductor Fairchild
FM1233ABAS3X Datasheet PDF : 7 Pages
1 2 3 4 5 6 7
September 2004
FM1233A
3-Pin µC Supervisor Circuit
General Description
The FM1233A 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 3.3V and 3.0V systems
with different tolerances.
FM1233A 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
asserted for a minimum period (tRST) 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.
Features
Precision monitoring of 3.3V and lower voltage
microprocessor systems
VTH values of 3.08V, 2.88V and 2.72V
Automatic restart of microprocessor after power failure
Reset Timeout Period Choice:
– Options AC and AD: 140ms (min)/256ms (typ)
– Option ABA: 17ms (min)/32ms (typ)
– Available on request: 64ms (typ) and 128ms (typ)
Internal 5kpull-up resistor
Operating Temperature -40°C to +105°C
Monitors external pushbutton override
Internal switch debounce circuitry
SOT23-3 package
Typical Operating Circuit
VCC
GND
Connection Diagram
3
FM1233A
1
2
RESET
Controller
GND 1
FM1233A 3 VCC
RESET 2
SOT23-3 Package
©2004 Fairchild Semiconductor Corporation
1
FM1233A Rev. E
www.fairchildsemi.com
 

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