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FM803 3-Pin µC Supervisor Device
August 2004
FM803
3-Pin µC Supervisor Device
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 mini-
mum of 140ms (256ms typical ). The reset output of FM803 is of
active low Open-Drain type and has an internal pull-up resistor
(SOT23 package only).
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.
Features
■
Automatic reset generation on power-up
■
Minimum 140 ms reset pulse
■
Internal 5k
Ω
pull-up resistor (SOT23 Package)
■
Other reset pulse choices available: 32 - 256 ms
■
Operating temperature
-40°C to + 105°C (SOT23)
-40°C to +85°C (SC70)
■
Choice of Reset Thresholds: 4.63V, 4.38V, 4.00V, 3.08V,
2.93V, 2.63V
■
SOT23-3 and SC70-3 Packages
Typical Operating Circuit
V
CC
3
FM803
Controller
1
2
RESET
GND
Connection Diagram
GND 1
FM803 3 V
CC
RESET 2
SC70-3 & SOT23-3 Packages
©2004 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
FM803 Rev. C.4
FM803 3-Pin µC Supervisor Device
Absolute Maximum Ratings
Voltage on any terminal relative to GND
V
CC
RESET
Input Current
Output Current: RESET
-0.3V to +6.0V
-0.3V to +6.0V
20mA
20mA
Rate of Rise of V
CC
Continuous Power Dissipation (T
A
= +70°C)
SOT23-3 (derate 4mW/°C above +70°C)
Operating Temperature Range
100V/µs
320mW
-40°C to +105°C
Storage Temperature Range
-65°C to +150°C
Lead Temperature (soldering, 10s)
+300°C
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 SOT-23 Package (T
A
= 25°C unless otherwise noted)
V
CC
= full range, as noted under conditions. See Note 1.
Parameter
Operating Voltage
Supply Current
Symbol
V
CC
I
CC
Conditions
T
A
= -40°C to +105°C
T
A
= -40°C to +105°C, V
CC
< 5.5V
FM803J/L/M
T
A
= -40°C to +105°C, V
CC
< 3.6V
FM803R/S/T
Min
1.1
Typ
(Note 2) Max
5.5
5
3
10
6
4.86
4.52
4.18
3.19
3.00
2.70
Units
V
µA
Reset Threshold
V
TH
FM803L
FM803M
FM803J
FM803T
FM803S
FM803R
T
A
= -40°C to +105°C
T
A
= -40°C to +105°C
T
A
= -40°C to +105°C
T
A
= -40°C to +105°C
T
A
= -40°C to +105°C
T
A
= -40°C to +105°C
4.40
4.18
3.90
2.97
2.79
2.49
4.63
4.38
4.00
3.08
2.93
2.63
30
V
Reset Threshold Tempco
V
CC
to Reset Delay
Reset Active Timout Period
FM803 Output Low
V
OL
V
CC
= V
TH
to (V
TH
- 100mV)
TA = -40°C to +105°C
V
CC
= V
TH
(min), I
SINK
= 1.2mA,
FM803R/S/T
V
CC
= V
TH
(min), I
SINK
= 3.2mA,
FM803J/L/M
V
CC
= < 1.0V, I
SINK
= 50µA
Open-Drain Output Leakage Current
V
CC
> V
TH
(max), I
RESET
= 1
0.8V
CC
140
ppm/°C
µs
560
0.3
0.4
0.3
1
µA
ms
V
10
256
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
CC
rampup is 200mV/sec in the 0 to 2V range for the device to function properly.
2
FM803 Rev. C.4
www.fairchildsemi.com
FM803 3-Pin µC Supervisor Device
Absolute Maximum Ratings
Voltage on any terminal relative to GND
V
CC
RESET
Input Current
Output Current: RESET
-0.3V to +6.0V
-0.3V to (V
CC
+ 0.3V)
20mA
20mA
Rate of Rise of V
CC
Continuous Power Dissipation (T
A
= +70°C)
SC70-3
Operating Temperature Range
100V/µs
174mW
-40°C to +85°C
Storage Temperature Range
-65°C to +150°C
Lead Temperature (soldering, 10s)
+300°C
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 SC70 Package (T
A
= 25°C unless otherwise noted)
V
CC
= full range, as noted under conditions. See Note 1.
Parameter
Operating Voltage
Symbol
V
CC
I
CC
Conditions
T
A
= 0°C to +70°C
T
A
= -40°C to +85°C
T
A
= -40°C to +85°C, V
CC
< 5.5V
FM803J/L/M
T
A
= -40°C to +85°C, V
CC
< 3.6V
FM803R/S/T
Min
1.4
1.6
Typ
(Note 2)
Max
5.5
5.5
Units
V
Supply Current
9
6
4.40
2.97
2.79
2.49
4.63
3.08
2.93
2.63
30
15
10
4.86
3.19
3.00
2.70
µA
Reset Threshold
V
TH
FM803L
FM803T
FM803S
FM803R
T
A
= -40°C to +85°C
T
A
= -40°C to +85°C
T
A
= -40°C to +85°C
T
A
= -40°C to +85°C
V
Reset Threshold Tempco
V
CC
to Reset Delay (Note 2)
Reset Active Timout Period
FM803 Output Low
V
OL
V
CC
= V
TH
to (V
TH
- 100mV)
T
A
= -40°C to +85°C
V
CC
= V
TH
(min), I
SINK
= 1.2mA,
FM803R/S/T
V
CC
= V
TH
(min), I
SINK
= 3.2mA,
FM803L
V
CC
= < 1.0V, I
SINK
= 50µA
Open-Drain Output Leakage Current
V
CC
> V
TH
(max), RESET = 1
140
ppm/°C
µs
560
0.35
0.4
0.3
7
µA
ms
V
10
256
Note 1:
Testing in production is 25°C only. V
CC
= 5V for FM803L, V
CC
= 3.3V for FM803T/S and V
CC
= 3V for FM803R. Limits over temperature are guaranteed by design.
Note 2:
Typical values are at 25°C.
3
FM803 Rev. C.4
www.fairchildsemi.com
FM803 3-Pin µC Supervisor Device
Pin Descriptions
Pin Number
1
2
3
Name
GND
RESET
V
CC
GROUND
Function
RESET remains LOW while V
CC
is below V
TH
,
and for at least 140ms after V
CC
rises above V
TH
.
Circuit Timing (Ex: FM803)
V
CC
3.3V
V
TH
1V
GND
RESET
3.3V
V
TH
1V
GND
140ms
(min)
When operating properly with 5V V
CC
(for example), RESET will
also be about 5V. When V
CC
starts to fall, RESET will follow it
down as shown. When V
CC
drops below V
TH
, RESET drops to
ground (“issues a RESET”) and stays there unless V
CC
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 V
CC
down to the ground.
When V
CC
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 V
CC
rises above V
TH
, 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 V
CC
≤
1V, a 100K resistor may be used
on the device output to GND.
4
FM803 Rev. C.4
www.fairchildsemi.com
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