FM1233DFS3X [FAIRCHILD]
3-Pin レC Supervisor Circuit; 3引脚μC的监控电路
| 型号： | FM1233DFS3X |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | 3-Pin レC Supervisor Circuit |
| 文件： | 总7页 (文件大小：34K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
February 2003
FM1233D
3-Pin µC Supervisor Circuit
General Description
Features
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.
Precision monitoring of 5V and lower voltage microprocessor
systems
V values of 4.62V, 4.38V and 4.12V
TH
Automatic restart of microprocessor after power failure
140ms (min) power-on RESET delay (typ.: 256ms)
Internal 5kΩ pull-up resistor
The device features a precision temperature-compensated volt-
age reference and comparator. When V falls to the threshold
CC
Other reset choices available: 32 to 128ms
Operating Temperature -40°C to +105°C
SOT23-3 package
voltage, a RESET pulse is issued, holding the output in the
active state. When power rises above V , the reset remains for
TH
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.
Typical Operating Circuit
VCC
3
FM1233D
Controller
1
2
RESET
GND
Connection Diagram
1
2
GND
3
VCC
FM1233D
RESET
SOT23-3 Package
©2002 Fairchild Semiconductor Corporation
FM1233D Rev. D
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Absolute Maximum Ratings
Voltage on any pin relative to GND
ESD Rating:
V
-0.3V to +6.0V
Human Body Model
>2KV
CC
RESET
-0.3V to (V + 0.3V)
Machine Model
>200KV
CC
Input Current
20mA
20mA
Continuous Power Dissipation (T = 70°C)
A
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
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 = 5V;T = -40°C to +105°C unless otherwise noted)
CC
A
(Note 1)
Parameter
Symbol
Conditions
Min
Typ
5
Max
5.5
Units
Operating Voltage
Supply Current
V
4.5
V
µA
V
CC
I
V
< 5V
3
6
CC
CC
Reset Threshold
Reset Threshold
Reset Threshold
Reset Output Voltage
V
V
V
V
FM1233DF
FM1233DD
FM1233DE
FM1233D
4.40
4.16
3.91
4.63
4.38
4.12
4.86
4.55
4.32
0.4
TH
TH
TH
OL
V
V
Isink = 5mA
= V (min)
V
V
CC
TH
Reset Timeout Period
t
FM1233D
140
256
560
ms
RST
Note 1: Testing at production is done at 25°C only. Limits over temperature are guaranteed by design.
2
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FM1233D Rev. D
Typical Operating Characteristics
Supply Current Vs.Temperature
10
8
10
8
6
6
4
4
2
2
0
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)
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FM1233D Rev. D
Pin Descriptions
Pin Number
Name
GND
Function
1
2
GROUND
RESET
RESET remains LOW while V is below V , and
CC
TH
for at least 140ms after V rises above V
.
CC
TH
3
V
CC
Circuit Timing (Ex: FM1233D)
V
CC
5V
V
TH
1V
GND
RESET
5V
V
TH
1V
GND
140ms
When operating properly with 5V V (for example), RESET will
When V
begins to rise, RESET follows it until 1.0V or so is
CC
CC
also be about 5V. 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 140 ms later.
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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FM1233D Rev. D
General Description
The FM1233D features a highly accurate voltage reference to
which V
is compared. Once V
is below the specified
CC
CC
threshold, it will drive the RESET line and continue to hold it low
until V returns above the threshold and the time for the
CC
RESET pulse duration has expired. The FM1233D is immune to
short negative going transients on the V line. The placement
CC
of a 0.1µF bypass capacitor as close as possible to the V pin
CC
provides additional transient immunity.
For a V
value below 1.0V, the FM1233D 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 FM1233D reset to be functional below this
range, use a 100KΩ pull-down resistor between RESET and
V
.
SS
5
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FM1233D Rev. D
Ordering Information
RESET
Top Marking Threshold (V)
Package
Type
Packing
Method
Part Number
FM1233DFS3X
FM1233DDS3X
FM1233DES3X
Output Type
3DF
3DD
3DE
4.62
4.38
4.12
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 5: Devices listed above feature 250ms typical reset pulse width. Consult Fairchild Sales for other reset pulse width options.
6
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FM1233D Rev. D
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
0-8
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.
1. 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.
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7
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FM1233D Rev. D
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