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FM1233D 3-Pin C Supervisor Circuit
February 2003
FM1233D 3-Pin C Supervisor Circuit
General Description
The FM1233D is a supervisor circuit that monitors a microprocessor 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. The device features a precision temperature-compensated voltage 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 approximately 250 ms to allow the system clock and other circuits to stabilize. The reset output of FM1233D is of open-drain active low type.
Features
s Precision monitoring of 5V and lower voltage microprocessor systems s VTH values of 4.62V, 4.38V and 4.12V s Automatic restart of microprocessor after power failure s 140ms (min) power-on RESET delay (typ.: 256ms) s s s s Internal 5k pull-up resistor Other reset choices available: 32 to 128ms Operating Temperature -40C to +105C SOT23-3 package
Typical Operating Circuit
VCC
3
FM1233D Controller
1
GND
2
RESET
Connection Diagram
GND
1
FM1233D
3 VCC
RESET
2
SOT23-3 Package
(c)2002 Fairchild Semiconductor Corporation
1
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FM1233D Rev. D
FM1233D 3-Pin C Supervisor Circuit
Absolute Maximum Ratings
Voltage on any pin relative to GND VCC RESET Input Current Output Current (RESET) ESD Rating: Human Body Model >2KV Machine Model >200KV Continuous Power Dissipation (TA = 70C) SOT23 (derate 4mW above 70C) 300mW 20mA Operating Temperature Range -40C to +105C Storage Temperature Range -65C to +150C Lead Temperature (soldering, 10s) +300C 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. -0.3V to +6.0V -0.3V to (VCC + 0.3V) 20mA
Electrical Characteristics (VCC = 5V; TA = -40C to +105C unless otherwise noted) (Note 1)
Parameter
Operating Voltage Supply Current Reset Threshold Reset Threshold Reset Threshold Reset Output Voltage Reset Timeout Period
Symbol
VCC ICC VTH VTH VTH VOL tRST VCC < 5V FM1233DF
Conditions
Min
4.5
Typ
5 3
Max
5.5 6 4.86 4.55 4.32 0.4
Units
V A V V V V ms
4.40 4.16 3.91 Isink = 5mA VCC = VTH(min) 140
4.63 4.38 4.12
FM1233DD FM1233DE FM1233D FM1233D
256
560
Note 1: Testing at production is done at 25C only. Limits over temperature are guaranteed by design.
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FM1233D 3-Pin C Supervisor Circuit
Typical Operating Characteristics
Supply Current Vs. Temperature
10 8 10 8 6 4 2 -55C +25C +110C 0
ICC (A)
6 4 2 0
Temperature (C)
Power up Reset Timeout Vs. Temperature
Power up Reset timeout (ms)
600 500 400 300 200 100 -40C +25C +105C 600 500 400 300 200 100
Temperature (C)
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FM1233D 3-Pin C Supervisor Circuit
Pin Descriptions
Pin Number
1 2 3
Name
GND RESET VCC GROUND
Function
RESET remains LOW while VCC is below VTH, and for at least 140ms after VCC rises above VTH.
Circuit Timing (Ex: FM1233D)
VCC 5V
VTH
1V
GND RESET 5V
VTH
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 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 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.
4 FM1233D Rev. D
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FM1233D 3-Pin C Supervisor Circuit
General Description
The FM1233D features a highly accurate voltage reference to which VCC is compared. Once VCC is below the specified threshold, it will drive the RESET line and continue to hold it low until VCC 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 0.1F 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 100K pull-down resistor between RESET and VSS.
5 FM1233D Rev. D
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FM1233D 3-Pin C Supervisor Circuit
Ordering Information
Part Number
FM1233DFS3X FM1233DDS3X FM1233DES3X
Top Marking
3DF 3DD 3DE
RESET Threshold (V)
4.62 4.38 4.12
Output Type
Open-Drain, active LOW Open-Drain, active LOW Open-Drain, active LOW
Package Type
3-Pin, SOT23 3-Pin, SOT23 3-Pin, SOT23
Packing Method
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.
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FM1233D 3-Pin C Supervisor Circuit
Physical Dimensions inches (millimeters) unless otherwise noted
0.021 0.015
0.055 0.047
0.098 0.083
0.120 0.105 0.040 0.031 0.079 0.071 0.0059 0.0035 0-8
0.004 0.001
PKG CL
0.010 0.005
0.76
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.
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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.
Fairchild Semiconductor Hong Kong 8/F, Room 808, Empire Centre 68 Mody Road, Tsimshatsui East Kowloon. Hong Kong Tel; +852-2722-8338 Fax: +852-2722-8383
2.29
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
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