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參數(shù)資料
| 型號： | FMFFM1233AC |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | 3-Pin ?C Supervisor Circuit |
| 中文描述： | 3引腳？?監(jiān)電路 |
| 文件頁數(shù)： | 1/7頁 |
| 文件大小： | 66K |
| 代理商： | FMFFM1233AC |
2004 Fairchild Semiconductor Corporation
FM1233A Rev. E
1
www.fairchildsemi.com
September 2004
F
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 V
voltage, a RESET pulse is issued, holding the output in the
active state. When power rises above V
asserted for a minimum period (t
and other circuits to stabilize. The reset output of FM1233A is of
open-drain active low type.
CC
falls to the threshold
TH
, the reset remains
) to allow the system clock
RST
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
V
TH
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 5k
pull-up resistor
Operating Temperature -40°C to +105°C
Monitors external pushbutton override
Internal switch debounce circuitry
SOT23-3 package
■
■
■
■
■
■
■
■
Typical Operating Circuit
Connection Diagram
SOT23-3 Package
1
FM1233A
Controller
2
3
V
CC
GND
RESET
GND
V
CC
RESET
1
FM1233A
2
3
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