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부품번호 | FM1233A 기능 |
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기능 | 3-Pin C Supervisor Circuit | ||
제조업체 | Fairchild Semiconductor | ||
로고 | |||
전체 7 페이지수
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 5kΩ pull-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
12
RESET
Controller
GND 1
FM1233A 3 VCC
RESET 2
SOT23-3 Package
©2004 Fairchild Semiconductor Corporation
FM1233A Rev. E
1
www.fairchildsemi.com
Pin Descriptions
Pin Number
1
2
3
Name
GND
RESET
VCC
Circuit Timing (Ex: FM1233A)
3.3V
VTH
Function
GROUND
RESET remains LOW while VCC is below VTH, and for at least
the minimum Reset Timeout period after VCC rises above VTH.
VCC
1V
GND
3.3V
VTH
RESET
1V
GND
140ms
(min)
When operating properly with 3V VCC (for example), RESET will
also be about 3V. When VCC starts to fall, RESET will follow it
down as shown. When VCC drops below VTH, RESET drops to
ground (“issues a RESET”) and stays there unless VCC also
falls below its minimum operating voltage, approx. 1V. At this
point, the supervisor loses control, and its output may rise, only
to again follow VCC down to the ground.
When VCC begins to rise, RESET follows it until 1.0V or so is
reached, whereupon the device regains control, RESET is
pulled to ground, etc. When VCC rises above VTH, RESET
comes out of RESET after the minimum Reset Timeout period.
If it is required that a lower value than GND + 1.0V is needed
on RESET signal during VCC ≤ 1V, a 100K resistor may be used
on the device output to GND.
FM1233A Rev. E
4 www.fairchildsemi.com
4페이지 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 significant
injury to the user.
2. 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.
Fairchild Semiconductor
Americas
Customer Response Center
Tel. 1-888-522-5372
Fairchild Semiconductor
Europe
Fax: +44 (0) 1793-856858
Deutsch Tel: +49 (0) 8141-6102-0
English
Tel: +44 (0) 1793-856856
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Hong Kong
8/F, Room 808, Empire Centre
68 Mody Road, Tsimshatsui East
Kowloon. Hong Kong
Tel; +852-2722-8338
Fax: +852-2722-8383
Fairchild Semiconductor
Japan Ltd.
4F, Natsume Bldg.
2-18-6, Yushima, Bunkyo-ku
Tokyo, 113-0034 Japan
Tel: 81-3-3818-8840
Fax: 81-3-3818-8841
FM1233A Rev. E
7 www.fairchildsemi.com
7페이지 | |||
구 성 | 총 7 페이지수 | ||
다운로드 | [ FM1233A.PDF 데이터시트 ] |
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부품번호 | 상세설명 및 기능 | 제조사 |
FM1233A | 3-Pin C Supervisor Circuit | Fairchild Semiconductor |
FM1233A | 3-Pin C Supervisor Circuit | Fairchild Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |