概述
数据手册FM1233AC 概述
3-Pin C Supervisor Circuit 3 - C脚电压监控器
FM1233AC 数据手册
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PDF下载September 2004
FM1233A
3-Pin µC Supervisor Circuit
General Description
Features
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.
■ Precision monitoring of 3.3V and lower voltage
microprocessor systems
■ V values of 3.08V, 2.88V and 2.72V
TH
■ Automatic restart of microprocessor after power failure
■ Reset Timeout Period Choice:
FM1233A features a precision temperature-compensated volt-
– Options AC and AD: 140ms (min)/256ms (typ)
– Option ABA: 17ms (min)/32ms (typ)
age reference and comparator. When V falls to the threshold
CC
voltage, a RESET pulse is issued, holding the output in the
– Available on request: 64ms (typ) and 128ms (typ)
active state. When power rises above V , the reset remains
TH
■ Internal 5kΩ pull-up resistor
asserted for a minimum period (t
) to allow the system clock
RST
■ Operating Temperature -40°C to +105°C
■ Monitors external pushbutton override
■ Internal switch debounce circuitry
■ SOT23-3 package
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.
Typical Operating Circuit
V
CC
3
FM1233A
Controller
1
2
RESET
GND
Connection Diagram
GND
1
2
V
3
FM1233A
CC
RESET
SOT23-3 Package
©2004 Fairchild Semiconductor Corporation
FM1233A Rev. E
1
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Absolute Maximum Ratings
Voltage on any pin relative to GND
Continuous Power Dissipation (T = 70°C)
A
V
-0.3V to +6.0V
SOT23 (derate 4mW above 70°C)
Operating Temperature Range
Storage Temperature Range
300mW
-40°C to +105°C
-65°C to +150°C
+300°C
CC
RESET
-0.3V to (V + 0.3V)
CC
Input Current
20mA
20mA
Output Current (RESET)
Lead Temperature (soldering, 10s)
These are stress ratings only, and functional operation is not implied for these levels or beyond. Exposure to Absolute Maximum Rating
conditions for extended periods may affect device reliability.
Electrical Characteristics (V = 3.3V;T = -40°C to +105°C unless otherwise
CC
A
noted) (Note 1)
Parameter
Operating Voltage
Supply Current
Symbol
Conditions
Min
Typ
3.3
Max
5.5
Units
V
1.2
V
µA
V
CC
I
V
< 3.3V
3
6
CC
CC
Reset Threshold
Reset Threshold
Reset Threshold
Reset Output Voltage
V
V
V
V
FM1233AC
FM1233AD
FM1233ABA
2.70
2.58
2.97
2.88
2.72
3.08
2.97
2.86
3.19
0.4
TH
TH
TH
OL
V
V
I
= 1.2mA
V
SINK
V
= V (min)
CC
TH
Reset Timeout Period
t
t
FM1233AC,
FM1233AD
140
256
32
560
ms
RST
Reset Timeout Period
Pushbutton Detect
Pushbutton Release
FM1233ABA
17
64
2.0
1.5
ms
V
RST
PBV
PBV
V
= 3.3V
0.8
DET
CC
Note 2
0.3
V
REL
Note 1: Testing at production is done at 25°C only. Limits over temperature are guaranteed by design.
Note 2: C = 100pF, V = 3.3V. It is recommended to connect 100pF capacitor between the Reset pin and Ground pin if pushbutton reset is implemented.
CC
2
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FM1233A Rev. E
Typical Operating Characteristics
Supply Current Vs.Temperature
10
8
10
8
6
6
4
4
V
CC
= 3.3V
2
0
2
0
-55C
+25C
+110C
Temperature (C)
Power up Reset Timeout Vs.Temperature
600
500
400
300
200
600
500
400
300
200
100
100
-40C
+25C
+105C
Temperature (C)
3
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FM1233A Rev. E
Pin Descriptions
Pin Number
Name
GND
Function
1
2
GROUND
RESET
RESET remains LOW while V is below V , and for at least
CC
TH
the minimum Reset Timeout period after V rises above V
.
TH
CC
3
V
CC
Circuit Timing (Ex: FM1233A)
V
CC
3.3V
V
TH
1V
GND
RESET
3.3V
V
TH
1V
GND
140ms
(min)
When operating properly with 3V V (for example), RESET will
When V
begins to rise, RESET follows it until 1.0V or so is
CC
CC
also be about 3V. When V
starts to fall, RESET will follow it
reached, whereupon the device regains control, RESET is
pulled to ground, etc. When V rises above V , RESET
CC
down as shown. When V
drops below V , RESET drops to
CC
TH
CC
TH
ground (“issues a RESET”) and stays there unless V
also
comes out of RESET after the minimum Reset Timeout period.
CC
falls below its minimum operating voltage, approx. 1V. At this
point, the supervisor loses control, and its output may rise, only
If it is required that a lower value than GND + 1.0V is needed
on RESET signal during V ≤ 1V, a 100K resistor may be used
CC
to again follow V down to the ground.
CC
on the device output to GND.
4
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FM1233A Rev. E
Connecting an External Reset to the FM1233A
General Description
The FM1233A features a highly accurate voltage reference to
VCC
which V is compared. Once V is below the specified thresh-
CC
CC
old, it will drive the RESET line and continue to hold it low until
returns above the threshold and the time for the RESET
3
V
CC
pulse duration has expired. The FM1233A is immune to short
negative going transients on the V line. The placement of a
FM1233
Controller
CC
0.1µF bypass capacitor as close as possible to the V pin pro-
CC
vides additional transient immunity.
1
2
RESET
For a V
value below 1.0V, the FM1233A does not sink very
CC
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 FM1233A reset to be functional below this
range, use a 100KΩ pull-down resistor between RESET and
GND
100pF
PUSH
BUTTON
V
.
SS
Bi-Directional Reset
The FM1233A permits a pushbutton (or a signal) to initiate a
reset externally. Once this external reset is detected on the
reset pin, FM1233 also actively asserts the reset signal to main-
tain the Reset Timeout period when the external reset is not
present .
FM1233 internally debounces glitches seen during a typical
push button closure. For proper operation, the external switch
should be paralleled by an external capacitor of 100pF to
0.01µF.
5
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FM1233A Rev. E
Ordering Information
Part
Number
Top
RESET
Output
Type
Package
Type
Packing
Method
Marking Threshold (V)
FM1233ACS3X
FM1233ADS3X
FM1233ABAS3X
33AC
33AD
3ABA
2.88
2.72
3.08
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
3-Pin, SOT23
3-Pin, SOT23
3-PIN, SOT23
3000 units in T&R
3000 units in T&R
3000 units in T&R
Note 3: FM1233AC and FM1233AD feature 256ms (typ) Reset timeout while FM1233ABA features 32ms (typ) Reset Timeout. Consult Fairchild Sales for other reset pulse width
options.
6
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FM1233A Rev. E
Physical Dimensions inches (millimeters) unless otherwise noted
0.021
0.015
0.055
0.047
0.098
0.083
0.120
0.105
0.0059
0.0035
0.040
0.031
0.010
0.005
0.079
0.071
0.004
0.001
PKG
CL
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
Fairchild Semiconductor
Europe
Fairchild Semiconductor
Hong Kong
Fairchild Semiconductor
Japan Ltd.
Customer Response Center
Tel. 1-888-522-5372
Fax: +44 (0) 1793-856858
8/F, Room 808, Empire Centre
68 Mody Road, Tsimshatsui East
Kowloon. Hong Kong
Tel; +852-2722-8338
Fax: +852-2722-8383
4F, Natsume Bldg.
Deutsch
English
Français
Italiano
Tel: +49 (0) 8141-6102-0
Tel: +44 (0) 1793-856856
Tel: +33 (0) 1-6930-3696
Tel: +39 (0) 2-249111-1
2-18-6, Yushima, Bunkyo-ku
Tokyo, 113-0034 Japan
Tel: 81-3-3818-8840
Fax: 81-3-3818-8841
7
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FM1233A Rev. E
FM1233AC 相关器件
| 型号 | 制造商 | 描述 | 价格 | 文档 |
| FM1233ACE3 | FAIRCHILD | Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN | 获取价格 |
|
| FM1233ACF3 | FAIRCHILD | Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN | 获取价格 |
|
| FM1233ACH3 | FAIRCHILD | Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN | 获取价格 |
|
| FM1233ACS3 | FAIRCHILD | Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN | 获取价格 |
|
| FM1233ACS3X | FAIRCHILD | 3-Pin C Supervisor Circuit | 获取价格 |
|
| FM1233AD | FAIRCHILD | 3-Pin C Supervisor Circuit | 获取价格 |
|
| FM1233ADH3 | FAIRCHILD | Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN | 获取价格 |
|
| FM1233ADS3 | FAIRCHILD | Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN | 获取价格 |
|
| FM1233ADS3X | FAIRCHILD | 3-Pin C Supervisor Circuit | 获取价格 |
|
| FM1233B | FAIRCHILD | 3-Pin レC Supervisor Circuit | 获取价格 |
|
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