2002 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
October 2002
FM809/810 3-Pin C Super
visor Cir
cuits
FM809/810 Rev. F
FM809/810
3-Pin C Supervisor Circuits
General Description
The FM809/810 are supervisor circuits that monitor power
supply or other system voltages and issue 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). FM809xx offers active low push-pull
type of reset while FM810xx offers active high push-pull type.
Several threshold voltages are offered to accommodate 5.0V,
3.3V, 3.0V and 2.7V system voltages.
The low supply current (typically 2 A)recommends FM809/810
devices for portable designs or wherever power saving is
primary.
These devices are offered in space saving 3-pin SOT23 and
SC70 packages.
Features
I
V
TH
voltages of 4.63V, 4.38V, 4.00V, 3.08V, 2.93V and 2.63V
I
RESET (FM809) or RESET (FM810) output
I
140ms power-on RESET delay (minimum)
I
RESET operation guaranteed to 1.0V
I
Supply current only 2A
I
No external components
I
Operating Range
-40C to +105C (SOT23)
-40C to +85C (SC70)
I
SOT23-3 and SC70-3 packages
Applications
I
Microcontrollers and Microprocessors
I
Appliances
I
Power-Supply Monitoring
I
Portable Equipment
I
Automotive Systems
Typical Operating Circuit
Connection Diagram
FM809
C
GND
V
CC
V
CC
GND
RESET
I/P
RESET
V
CC
3
GND
RESET (809) or
RESET (810)
1
2
FM809/810
SOT23-3 & SC70-3Packages
FM809/810 3-Pin C Super
visor Cir
cuits
2
www.fairchildsemi.com
FM809/810 Rev. F
Absolute Maximum Ratings
Voltage on any terminal relative to GND
V
CC
-0.3V to +6.0V
RESET, RESET
-0.3V to (V
CC
+ 0.3V)
Input Current
20mA
Output Current: RESET, RESET
20mA
ESD Rating
Human Body Model
>2KV
Machine Model
>200KV
Rate of Rise of V
CC
100V/s
Continuous Power Dissipation (T
A
= +70C)
SOT23-3 (derate 4mW/C above +70C)
320mW
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.
Electrical Characteristics
SOT23 Package (T
A
= 25C unless otherwise noted)
V
CC
= full range, as noted under conditions. See Note 1.
Note 1:
Testing in production is 25C only. V
CC
= 5V for FM8xxL/M/J, V
CC
= 3.3V for FM8xxT/S and V
CC
= 3V for FM8xxR. Limits over temperature are guaranteed by design.
Note 2
: RESET output is for FM809. RESET output is for FM810.
Note 3
: Typical values are at 25C.
Note 4:
Recommended minimum slew rate for the V
CC
rampup is 200mV/sec in the 0 to 2V range for the device to function properly.
Parameter
Symbol
Conditions
Min
Typ
(Note 3) Max Units
Operating Voltage
V
CC
T
A
= 0C to +70C
1.0
5.5
V
T
A
= -40C to 105C
1.1
5.5
Supply Current
I
CC
T
A
= -40C to 105C, V
CC
< 5.5V
FM809J/L/M
5
10
A
T
A
= -40C to 105C, V
CC
< 3.6V
FM809R/S/T
2
6
Reset Threshold
V
TH
FM8xxL
T
A
= -40C to +105C
4.40
4.63
4.86
V
FM8xxM
T
A
= -40C to +105C
4.18
4.38
4.52
FM8xxJ
T
A
= -40C to +105C
3.90
4.00
4.18
FM8xxT
T
A
= -40C to +105C
2.97
3.08
3.19
FM8xxS
T
A
= -40C to +105C
2.79
2.93
3.00
FM8xxR
T
A
= -40C to +105C
2.49
2.63
2.70
Reset Threshold Tempco
30
ppm/C
V
CC
to Reset Delay (Note 2)
V
CC
= V
TH
to (V
TH
- 100mV)
10
15
s
Reset Active Timout Period
T
A
= -40C to +105C 140
256
560
ms
FM809 Output Low (RESET)
V
OL
V
CC
= V
TH
(min), I
SINK
= 1.2mA,
FM809R/S/T
0.3
V
V
CC
= V
TH
(min), I
SINK
= 3.2mA,
FM809J/L/M
0.4
V
CC
= < 1.0V, I
SINK
= 50A
0.3
FM809 Output High (RESET)
V
OH
V
CC
> V
TH
(max), I
SOURCE
= 500A (R/S/T)
0.8V
CC
V
V
CC
> V
TH
(max), I
SOURCE
= 800A (J/M/L)
V
CC
- 1.5V
FM810 Output Low (RESET)
V
OL
V
CC
= V
TH
(max), I
SINK
= 1.2mA,
FM810R/S/T
0.3
V
V
CC
= V
TH
(max), I
SINK
= 3.2mA,
FM810J/L/M
0.4
FM810 Output High (RESET)
V
OH
1.8V < V
CC
< V
TH
(min), I
SOURCE
= 150A
0.8V
CC
V
FM809/810 3-Pin C Super
visor Cir
cuits
3
www.fairchildsemi.com
FM809/810 Rev. F
Absolute Maximum Ratings
Voltage on any terminal relative to GND
V
CC
-0.3V to +6.0V
RESET, RESET
-0.3V to (V
CC
+ 0.3V)
Input Current
20mA
Output Current: RESET, RESET
20mA
ESD Rating
Human Body model
1.5KV
Machine model
>200KV
Rate of Rise of V
CC
100V/s
Continuous Power Dissipation (T
A
= +70C)
SC70-3
174mW
Operating Temperature Range
-40C to +85C
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.
Electrical Characteristics
SC70 Package (T
A
= 25C unless otherwise noted)
V
CC
= full range, as noted under conditions. See Note 1.
Note 1:
Testing in production is 25C only. V
CC
= 5V for FM8xxL/M/J, V
CC
= 3.3V for FM8xxT/S and V
CC
= 3V for FM8xxR. Limits over temperature are guaranteed by design.
Note 2:
RESET output is for FM809. RESET output is for FM810.
Note 3:
Typical values are at 25C.
Parameter
Symbol
Conditions
Min
Typ
(Note 3) Max Units
Operating Voltage
V
CC
T
A
= 0C to +70C
1.4
5.5
V
T
A
= -40C to 85C
1.6
5.5
Supply Current
I
CC
T
A
= -40C to 85C, V
CC
< 5.5V FM809J/L/M
9
15
A
T
A
= -40C to 85C, V
CC
< 3.6V FM809R/S/T
6
10
Reset Threshold
V
TH
FM8xxL
T
A
= -40C to +85C
4.40
4.63
4.86
V
FM8xxM
T
A
= -40C to +85C
4.18
4.38
4.52
FM8xxJ
T
A
= -40C to +85C
3.90
4.00
4.18
FM8xxT
T
A
= -40C to +85C
2.97
3.08
3.19
FM8xxS
T
A
= -40C to +85C
2.79
2.93
3.00
FM8xxR
T
A
= -40C to +85C
2.49
2.63
2.70
Reset Threshold Tempco
30
ppm/C
V
CC
to Reset Delay (Note 2)
V
CC
= V
TH
to (V
TH
- 100mV)
10
15
s
Reset Active Timout Period
T
A
= -40C to +85C
100
256
560
ms
FM809 Output Low (RESET)
V
OL
V
CC
= V
TH
(min), I
SINK
= 1.2mA, FM809R/S/T
0.35
V
V
CC
= V
TH
(min), I
SINK
= 3.2mA, FM809J/L/M
0.4
V
CC
= < 1.0V, I
SINK
= 50A
0.3
FM809 Output High (RESET)
V
OH
V
CC
> V
TH
(max), I
SOURCE
= 500A (R/S/T)
0.8V
CC
V
V
CC
> V
TH
(max), I
SOURCE
= 800A (J/M/L)
V
CC
- 1.5V
FM810 Output Low (RESET)
V
OL
V
CC
= V
TH
(max), I
SINK
= 1.2mA, FM810R/S/T
0.35
V
V
CC
= V
TH
(max), I
SINK
= 3.2mA, FM810J/L/M
0.4
FM810 Output High (RESET)
V
OH
1.8V < V
CC
< V
TH
(min), I
SOURCE
= 150A
0.8V
CC
V
FM809/810 3-Pin C Super
visor Cir
cuits
4
www.fairchildsemi.com
FM809/810 Rev. F
Pin Descriptions
* with overbar, FM809 (RESET); without, FM810 (RESET).
Circuit Timing
(e.g.: FM809)
When operating properly with 5V in (for example), V
OUT
will also
be about 5V. When V
IN
starts to fall, V
OUT
will follow it down as
shown. When V
IN
drops below V
TH
, V
OUT
drops to ground
("issues a RESET") and stays there unless V
IN
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
IN
down to the ground.
When V
IN
begins to rise, V
OUT
follows it until 1.0V or so is
reached, whereupon the device regains control, V
OUT
is pulled
to ground, etc. When V
IN
rises above V
TH
, V
OUT
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 for the FM809, to V
CC
for the
FM810).
Pin Number
Name
Function
1
GND
GROUND
2
RESET*
RESET (RESET) remains LOW (HIGH) while V
CC
is below V
TH
,
and for at least 140ms after V
CC
rises above V
TH
.
3
V
CC
5V
V
TH
1V
GND
5V
V
TH
1V
GND
INPUT
OUTPUT
140ms
FM809/810 3-Pin C Super
visor Cir
cuits
5
www.fairchildsemi.com
FM809/810 Rev. F
Ordering Information
(FM809)
Note 4: Devices listed above feature 250ms typical Reset Pulse width. Consult Fairchild sales for other reset pulse width options.
Part Number
Top Marking
RESET
Threshold (V)
Output Type
Package Type
Packing
Method
FM809LS3X
09L
4.63
Push-Pull, active LOW
3-Pin, SOT23
3000 units in T&R
FM809MS3X
09M
4.38
Push-Pull, active LOW
3-Pin, SOT23
3000 units in T&R
FM809JS3X
09J
4.00
Push-Pull, active LOW
3-Pin, SOT23
3000 units in T&R
FM809TS3X
09T
3.08
Push-Pull, active LOW
3-Pin, SOT23
3000 units in T&R
FM809SS3X
09S
2.93
Push-Pull, active LOW
3-Pin, SOT23
3000 units in T&R
FM809RS3X
09R
2.63
Push-Pull, active LOW
3-Pin, SOT23
3000 units in T&R
FM809LP3X
VLY
4.63
Push-Pull, active LOW
3-Pin, SC70
3000 units in T&R
FM809MP3X
VMY
4.38
Push-Pull, active LOW
3-Pin, SC70
3000 units in T&R
FM809JP3X
VJY
4.00
Push-Pull, active LOW
3-Pin, SC70
3000 units in T&R
FM809TP3X
VTY
3.08
Push-Pull, active LOW
3-Pin, SC70
3000 units in T&R
FM809SP3X
VSY
2.93
Push-Pull, active LOW
3-Pin, SC70
3000 units in T&R
FM809RP3X
VRY
2.63
Push-Pull, active LOW
3-Pin, SC70
3000 units in T&R
PDF 
ZIP