fm803 Fairchild Semiconductor, fm803 Datasheet

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fm803

Manufacturer Part Number
fm803
Description
3-pin Usupervisor Device
Manufacturer
Fairchild Semiconductor
Datasheet

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© 2000 Fairchild Semiconductor International
FM803 Rev. C.3
FM803
3-Pin
General Description
The FM803 is a supervisory device designed to monitor power
supply or other system voltage. FM803 generates a reset pulse
whenever the voltage being monitored is out of tolerance. Once
asserted, the reset pulse is guaranteed to be valid for a minimum
of 140ms (256ms typical ). The reset output of FM803 is of active
low Open-Drain type and has an internal pull-up resistor.
Several threshold voltages are offered to accommodate 5.0V,
3.3V, 3.0V and 2.7V system voltages.
These devices are offered in space saving 3-pin SOT23 and SC70
packages.
Typical Operating Circuit
Connection Diagram
µ
C Supervisor Device
GND
V
CC
/RESET
1
GND
SC70-3 & SOT23-3 Packages
FM803
3
1
2
2
FM803
/RESET
1
Features
I Automatic reset generation on power-up
I Minimum 140 ms reset pulse
I Internal 5kΩ pull-up resistor
I Other reset pulse choices available: 32 - 256 ms
I Operating temperature
I Choice of Reset Thresholds: 4.63V, 4.38V, 4.00V, 3.08V,
I SOT23-3 and SC70-3 Packages
-40°C to + 105°C (SOT-23)
-40°C to +85°C (SC70)
2.93V, 2.63V
3
V
CC
Controller
www.fairchildsemi.com
www.fairchildsemi.com
October 2002

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fm803 Summary of contents

Page 1

... FM803 generates a reset pulse whenever the voltage being monitored is out of tolerance. Once asserted, the reset pulse is guaranteed to be valid for a minimum of 140ms (256ms typical ). The reset output of FM803 is of active low Open-Drain type and has an internal pull-up resistor. Several threshold voltages are offered to accommodate 5.0V, 3 ...

Page 2

... V TH Reset Threshold Tempco V to Reset Delay CC Reset Active Timout Period FM803 Output Low V OL Open-Drain Output Leakage Current Note 1: Testing in production is 25°C only. Limits over temperature are guaranteed by design. Note 2: Typical values are at 25°C. Note 3: Recommended minimum slew rate for the V FM803 Rev ...

Page 3

... CC TH SINK FM803J/L < 1.0V 50µA CC SINK V > V (max), /RESET = 3.3V for FM803T/S and for FM803R. Limits over temperature are guaranteed by design 100V/µ +70°C) A 174mW -40°C to +85°C -65°C to +150°C +300°C Min Typ Max Units (Note 2) 1 ...

Page 4

... Pin Descriptions Pin Number Circuit Timing (Ex: FM803) 3. GND 3. GND When operating properly with 5V V (for example), /RESET will CC also be about 5V. When V starts to fall, /RESET will follow it CC down as shown. When V drops below V CC ground (“issues a RESET”) and stays there unless V below its minimum operating voltage, approx ...

Page 5

... QMY FM803JP3X QJY FM803TP3X QTY FM803SP3X QSY FM803RP3X QRY Note 4: Devices listed above feature 250ms typical Reset Pulse width. Consult Fairchild sales for other reset pulse width options. FM803 Rev. C.3 RESET Output Threshold (V) Type 4.63 Open-Drain, active LOW 4.38 Open-Drain, active LOW 4.00 Open-Drain, active LOW 3 ...

Page 6

... Physical Dimensions inches (millimeters) unless otherwise noted 0.021 0.015 0.120 0.105 0.079 0.071 FM803 Rev. C.3 0.055 0.098 0.047 0.083 0.0059 0.0035 0.040 0.031 0.010 0.005 0.004 0.001 PKG C L 0.76 0.95 LAND PATTERN RECOMMENDATION SOT-23 Package Dimensions FS Pkg Code AU 6 0-8˚ www.fairchildsemi.com www.fairchildsemi.com ...

Page 7

... Deutsch English Français Italiano 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. FM803 Rev. C.3 .053 (1.35) .045 (1.15) .087 (2.2) .079 (2.0) ...

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