FM809/810 3-Pin µC Supervisor Circuits
August 2005
FM809/810
3-Pin µC 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 µA)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.
■
140ms power-on RESET delay (minimum)
■
RESET operation guaranteed to 1.0V
■
Supply current only 2µA
■
No external components
■
Operating Range
– -40°C to +105°C (SOT23)
– -40°C to +85°C (SC70)
■
SOT23-3 and SC70-3 packages
Applications
■
Microcontrollers and Microprocessors
■
Appliances
■
Power-Supply Monitoring
■
Portable Equipment
■
Automotive Systems
Features
■
V
TH
voltages of 4.63V, 4.38V, 4.00V, 3.08V, 2.93V and 2.63V
■
RESET (FM809) or RESET (FM810) output
Typical Operating Circuit
V
CC
V
CC
FM809
µC
RESET
RESET
I/P
GND
GND
Connection Diagram
GND
1
3
RESET (809) or
RESET (810)
2
V
CC
FM809/810
SOT23-3 & SC70-3Packages
©2005 Fairchild Semiconductor Corporation
1
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FM809/810 Rev. G
FM809/810 3-Pin µC Supervisor Circuits
Absolute Maximum Ratings
Voltage on any terminal relative to GND
V
CC
ESD Rating
Human Body Model
>2KV
RESET, RESET
-0.3V to (V
CC
+ 0.3V)
Machine Model
>200KV
Input Current
20mA
100V/µs
Rate of Rise of V
CC
Output Current: RESET, RESET
Continuous Power Dissipation (T
A
= +70°C)
20mA
SOT23-3 (derate 4mW/°C above +70°C)
320mW
Operating Temperature Range
-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.
-0.3V to +6.0V
Electrical Characteristics SOT23 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 105°C
T
A
= -40°C to 105°C, V
CC
< 5.5V
FM809J/L/M
T
A
= -40°C to 105°C, V
CC
< 3.6V
FM809R/S/T
Min
1.0
1.1
Typ
(Note 3) Max Units
5.5
5.5
5
2
10
6
4.86
4.52
4.18
3.19
3.00
2.70
ppm/°C
15
560
0.3
0.4
0.3
µs
ms
V
V
µA
V
Supply Current
Reset Threshold
V
TH
FM8xxL
FM8xxM
FM8xxJ
FM8xxT
FM8xxS
FM8xxR
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
Reset Threshold Tempco
V
CC
to Reset Delay (Note 2)
Reset Active Timout Period
FM809 Output Low (RESET)
V
OL
V
CC
= V
TH
to (V
TH
- 100mV)
T
A
= -40°C to +105°C
V
CC
= V
TH
(min), I
SINK
= 1.2mA,
FM809R/S/T
V
CC
= V
TH
(min), I
SINK
= 3.2mA,
FM809J/L/M
V
CC
= < 1.0V, I
SINK
= 50µA
FM809 Output High (RESET)
V
OH
V
OL
V
CC
> V
TH
(max), I
SOURCE
= 500µA (R/S/T)
V
CC
> V
TH
(max), I
SOURCE
= 800µA (J/M/L)
FM810 Output Low (RESET)
V
CC
= V
TH
(max), I
SINK
= 1.2mA,
FM810R/S/T
V
CC
= V
TH
(max), I
SINK
= 3.2mA,
FM810J/L/M
FM810 Output High (RESET)
V
OH
1.8V < V
CC
< V
TH
(min), I
SOURCE
= 150µA
0.8V
CC
0.8V
CC
V
CC
- 1.5V
140
10
256
V
0.3
0.4
V
V
Note 1:
Testing in production is 25°C 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 25°C.
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.
2
FM809/810 Rev. G
www.fairchildsemi.com
FM809/810 3-Pin µC Supervisor Circuits
Absolute Maximum Ratings
Voltage on any terminal relative to GND
V
CC
RESET, RESET
Input Current
Output Current: RESET, RESET
-0.3V to +6.0V
-0.3V to (V
CC
+ 0.3V)
20mA
ESD Rating
Human Body model
Machine model
1.5KV
>200KV
100V/µs
Rate of Rise of V
CC
20mA
Continuous Power Dissipation (T
A
= +70°C)
SC70-3
174mW
Operating Temperature Range
-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
V
TH
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 FM809J/L/M
T
A
= -40°C to 85°C, V
CC
< 3.6V FM809R/S/T
FM8xxL
FM8xxM
FM8xxJ
FM8xxT
FM8xxS
FM8xxR
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
T
A
= -40°C to +85°C
T
A
= -40°C to +85°C
Min
1.4
1.6
Typ
(Note 3) Max Units
5.5
5.5
9
6
15
10
4.86
4.52
4.18
3.19
3.00
2.70
ppm/°C
15
560
0.35
0.4
0.3
µs
ms
V
V
µA
V
Supply Current
Reset Threshold
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
Reset Threshold Tempco
V
CC
to Reset Delay (Note 2)
Reset Active Timout Period
FM809 Output Low (RESET)
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, FM809R/S/T
V
CC
= V
TH
(min), I
SINK
= 3.2mA, FM809J/L/M
V
CC
= < 1.0V, I
SINK
= 50µA
FM809 Output High (RESET)
V
OH
V
OL
V
OH
V
CC
> V
TH
(max), I
SOURCE
= 500µA (R/S/T)
V
CC
> V
TH
(max), I
SOURCE
= 800µA (J/M/L)
FM810 Output Low (RESET)
V
CC
= V
TH
(max), I
SINK
= 1.2mA, FM810R/S/T
V
CC
= V
TH
(max), I
SINK
= 3.2mA, FM810J/L/M
FM810 Output High (RESET)
1.8V < V
CC
< V
TH
(min), I
SOURCE
= 150µA
0.8V
CC
0.8V
CC
V
CC
- 1.5V
100
10
256
V
0.35
0.4
V
V
Note 1:
Testing in production is 25°C 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 25°C.
3
FM809/810 Rev. G
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FM809/810 3-Pin µC Supervisor Circuits
Pin Descriptions
Pin Number
1
2
3
Name
GND
RESET*
V
CC
GROUND
Function
RESET (RESET) remains LOW (HIGH) while V
CC
is below V
TH
,
and for at least 140ms after V
CC
rises above V
TH
.
* with overbar, FM809 (RESET); without, FM810 (RESET).
Circuit Timing
(e.g.: FM809)
INPUT
5V
V
TH
1V
GND
OUTPUT
5V
V
TH
1V
GND
140ms
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).
4
FM809/810 Rev. G
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FM809/810 3-Pin µC Supervisor Circuits
Ordering Information
(FM809)
Part Number
FM809LS3X
FM809MS3X
FM809JS3X
FM809TS3X
FM809SS3X
FM809RS3X
FM809LP3X
FM809MP3X
FM809JP3X
FM809TP3X
FM809SP3X
FM809RP3X
Top Marking
09L
09M
09J
09T
09S
09R
VLY
VMY
VJY
VTY
VSY
VRY
RESET
Threshold (V)
4.63
4.38
4.00
3.08
2.93
2.63
4.63
4.38
4.00
3.08
2.93
2.63
Output Type
Push-Pull, active LOW
Push-Pull, active LOW
Push-Pull, active LOW
Push-Pull, active LOW
Push-Pull, active LOW
Push-Pull, active LOW
Push-Pull, active LOW
Push-Pull, active LOW
Push-Pull, active LOW
Push-Pull, active LOW
Push-Pull, active LOW
Push-Pull, active LOW
Package Type
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SC70
3-Pin, SC70
3-Pin, SC70
3-Pin, SC70
3-Pin, SC70
3-Pin, SC70
Packing
Method
3000 units in T&R
3000 units in T&R
3000 units in T&R
3000 units in T&R
3000 units in T&R
3000 units in T&R
3000 units in T&R
3000 units in T&R
3000 units in T&R
3000 units in T&R
3000 units in T&R
3000 units in T&R
Note 4:
Devices listed above feature 250ms typical Reset Pulse width. Consult Fairchild sales for other reset pulse width options.
Note 5:
For the SC70 package, the third character of the top marking, identified as “Y” in the above table, identifies wafer lot code.
5
FM809/810 Rev. G
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