FM1233DFES3 [FAIRCHILD]
Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN;
| 型号： | FM1233DFES3 |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN 光电二极管 |
| 文件： | 总7页 (文件大小：44K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PRELIMINARY
May 2001
FM1233D
3-Pin µC Supervisor Circuit
General Description
Features
The FM1233D is a supervisor circuit that monitors a microproces-
sor power supply or other system voltage and issues a reset pulse
when a fault condition exists. Several different threshold voltages
areofferedtoaccommodate5Vsystemswithdifferenttolerances.
I Precision monitoring of 5V and lower voltage microprocessor
systems
I VTH values of 4.62V, 4.38V and 4.12V
I Automatic restart of microprocessor after power failure
I 140ms (min) power-on RESET delay
I Internal 5kΩ pull-up resistor
The device 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 for approxi-
mately 250 ms to allow the system clock and other circuits to
stabilize. The reset output of FM1233D is of open-drain active low
type.
I Other reset choices available: 32 to 256ms
I Operating Temperature -40°C to +105°C
I SOT23-3 package
Typical Operating Circuit
VCC
3
FM1233D
Controller
1
2
/RESET
GND
Connection Diagram
1
2
GND
3
VCC
FM1233D
/RESET
SOT23-3 Package
1
© 2001 Fairchild Semiconductor Corporation
FM1233D Rev. A.1
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Absolute Maximum Ratings
Voltage on any pin relative to GND
VCC
Continuous Power Dissipation (TA = 70°C)
SOT23 (derate 4mW above 70°C)
-0.3V to +6.0V
300mW
-40°C to +105°C
-65°C to +150°C
+300°C
RESET, RESET
Input Current
Output Current (RESET, RESET)
-0.3V to (VCC + 0.3V)
Operating Temperature Range
Storage Temperature Range
Lead Temperature (soldering, 10s)
20mA
20mA
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 (VCC = 5V; TA = -40°C to +105°C unless otherwise noted) (Note 1)
Parameter
Operating Voltage
Supply Current
Symbol
VCC
Conditions
Min
Typ
Max
5.5
6
Units
V
4.5
5
3
ICC
VCC < 5V
µA
Reset Threshold
Reset Threshold
VTH
VTH
FM1233DD
FM1233DE
4.40
4.16
4.63
4.38
4.12
4.86
4.55
4.32
V
V
Reset Threshold
VTH
VOH
FM1233DF
FM1233D
3.91
V
V
Reset Output Voltage
ISOURCE = 150 µA
0.8VCC
VCC = VTH(max)
Reset Output Voltage
Reset Timeout Period
VOL
FM1233D
FM1233D
ISINK = 5mA
VCC = VTH(min)
0.4
V
tRST
140
256
560
ms
Note 1: Testing at production is done at 25°C only. Limits over temperature are guaranteed by design.
Note 2: C = 100pF, VCC = 3.3V. It is recommended to connect 100pF capacitor between the Reset pin and Ground pin if pushbutton reset is implemented.-
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FM1233D Rev. A.1
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
600
500
400
300
200
100
500
400
300
200
100
-40C
+25C
+105C
Temperature (C)
3
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FM1233D Rev. A.1
Pin Descriptions
Pin Number
Name
GND
Function
1
2
GROUND
/RESET
/RESET remains LOW while VCC is below
VTH, and for at least 140ms after VCC rises
above VTH
.
3
VCC
Circuit Timing (Ex: FM1233D)
V
CC
5V
V
TH
1V
GND
RESET
5V
V
TH
1V
GND
140ms
When operating properly with 5V VCC (for example), /RESET will
also be about 5V. 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
belowitsminimumoperatingvoltage, approx. 1V. Atthispoint, 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 140 ms later.
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.
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FM1233D Rev. A.1
General Description
The FM1233D features a highly accurate voltage reference to
which VCC is compared. Once VCC is below the specified thresh-
old, itwilldrivethe/RESETlineandcontinuetoholditlowuntilVCC
returns above the threshold and the time for the RESET pulse
duration has expired. The FM1233D is immune to short negative
going transients on the VCC line. The placement of a 0.1µF bypass
capacitor as close as possible to the VCC pin provides additional
transient immunity.
For a VCC value below 1.0V, the FM1233D does not sink very
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 VSS
.
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FM1233D Rev. A.1
Ordering Information
Part
Top
RESET
RESET Pulse
Width (ms)
256ms
Output
Package
Type
Number
Marking Threshold (V)
Type
FM1233DDS3
3DD
3DE
4.62
4.38
4.12
4.62
4.38
4.12
4.62
4.38
4.12
4.62
4.38
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
FM1233DES3
256ms
FM1233DFS3
3DF
256ms
FM1233DDES3 (Note 3)
FM1233DEES3 (Note 3)
FM1233DFES3 (Note 3)
FM1233DDFS3 (Note 3)
FM1233DEFS3 (Note 3)
FM1233DFFS3 (Note 3)
FM1233DDHS3 (Note 3)
FM1233DEHA3 (Note 3)
3DDE
3DEE
3DFE
3DDF
3DEF
3DFF
3DDH
3DEH
32ms
32ms
32ms
64ms
64ms
64ms
128ms
128ms
Note3: These devices are available upon special request only. Please contact Fairchild sales for availability and minimum ordering requirements.
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FM1233D Rev. A.1
Physical Dimensions inches (millimeters) unless otherwise noted
0.40 0.03
0.03~0.10
0.38 REF
+0.05
–0.023
0.40 0.03
0.12
0.96~1.14
2.90 0.10
0.95 0.03 0.95 0.03
1.90 0.03
0.508REF
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)areintendedforsurgicalimplantintothebody,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 ex-
pected to cause the failure of the life support device or system,
or to affect its safety or effectiveness.
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Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.
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FM1233D Rev. A.1
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