FM809/810 3-Pin
µ
C Supervisor Circuits
June 2001
FM809/810
3-Pin
µ
C Supervisor Circuits
General Description
The FM809/810 are supervisor circuits that monitor power supply
or other system voltages and issue reset pulses (FM809 =
RESET, FM810 = RESET) when a fault condition exists. Several
threshold voltages are offered to accommodate system voltages
of 5.0V, 3.3V, 3.0V and 2.7V with different tolerances.
The low supply current (typically 2µA) recommends the devices
for portable designs or wherever power saving is primary.
The minimum RESET delay is 140ms, but this may be changed to
a value between 32-256ms. Contact the factory for more informa-
tion.
I
140ms power-on RESET delay (minimum)
I
RESET operation guaranteed to 1.0V
I
Supply current only 2µA
I
No external components
I
-40°C to +105°C Operating Range
I
SOT23-3 package
Applications
I
Microcontrollers and Microprocessors
I
Appliances
I
Power-Supply Monitoring
I
Portable Equipment
I
Automotive Systems
Features
I
V
TH
voltages of 4.63V, 4.38V, 4.00V, 3.08V, 2.93V and
2.63V (contact factory for lower values of V
TH
)
I
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 Package
© 2001 Fairchild Semiconductor Corporation
FM809/810 Rev. C
1
www.fairchildsemi.com
FM809/810 3-Pin
µ
C Supervisor Circuits
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
Output Current: RESET, RESET
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
Storage Temperature Range
Lead Temperature (soldering, 10s)
100V/µs
320mW
-40°C to +105°C
-65°C to +150°C
+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
(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
= 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 +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
Min
1.0
1.1
Typ
(Note 3)
Max
5.5
5.5
Units
V
µA
5
2
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
10
6
4.86
4.52
4.18
3.19
3.00
2.70
Reset Threshold
V
TH
V
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
V
CC
> V
TH
(max), I
SOURCE
= 500µA
V
CC
> V
TH
(max), I
SOURCE
= 800µA
V
CC
= V
TH
(max), I
SINK
= 1.2mA,
FM810R/S/T
V
CC
= V
TH
(max), I
SINK
= 3.2mA,
FM810J/L/M
1.8V < V
CC
< V
TH
(min), I
SOURCE
= 150µA
0.8V
CC
0.8V
CC
V
CC
- 1.5V
140
ppm/°C
µs
560
0.3
0.4
0.3
V
0.3
0.4
V
V
ms
V
10
256
FM809 Output High (RESET)
FM810 Output Low (RESET)
V
OH
V
OL
FM810 Output High (RESET)
V
OH
Note 1:
Testing in production is 25°C only. 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.
2
FM809/810 Rev. C
www.fairchildsemi.com
FM809/810 3-Pin
µ
C Supervisor Circuits
Pin Descriptions
Pin Number
1
2
Name
GND
RESET*
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
.
3
* with overbar, FM809 (RESET); without, FM810 (RESET).
V
CC
Circuit Timing (Ex: 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).
3
FM809/810 Rev. C
www.fairchildsemi.com
FM809/810 3-Pin
µ
C Supervisor Circuits
Typical Operating Characteristics
Supply Current Vs. Temperature
10
8
V
CC
= 5V
10
8
6
I
CC
(µA)
6
V
CC
= 3.3V
4
2
0
-55C
+25C
Temperature (C)
+110C
4
2
0
Power up Reset Timeout Vs. Temperature
Power up Reset timeout (ms)
600
500
400
300
200
100
-40C
+25C
Temperature (C)
+105C
600
500
400
300
200
100
4
FM809/810 Rev. C
www.fairchildsemi.com
FM809/810 3-Pin
µ
C Supervisor Circuits
Ordering Information (FM809)
Part
Number
FM809LS3
FM809MS3
FM809JS3
FM809TS3
FM809SS3
FM809RS3
FM809LES3 (Note 4)
FM809MES3 (Note 4)
FM809JES3 (Note 4)
FM809TES3 (Note 4)
FM809SES3 (Note 4)
FM809RES3 (Note 4)
FM809LFS3 (Note 4)
FM809MFS3 (Note 4)
FM809JFS3 (Note 4)
FM809TFS3 (Note 4)
FM809SFS3 (Note 4)
FM809RFS3 (Note 4)
FM809LHS3 (Note 4)
FM809MHS3 (Note 4)
FM809JHS3 (Note 4)
FM809THS3 (Note 4)
FM809SHS3 (Note 4)
FM809RHS3 (Note 4)
Top
Marking
09L
09M
09J
09T
09S
09R
09LE
09ME
09JE
09TE
09SE
09RE
09LF
09MF
09JF
09TF
09SF
09RF
09LH
09MH
09JH
09TH
09SH
09RH
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
4.63
4.38
4.00
3.08
2.93
2.63
4.63
4.38
4.00
3.08
2.93
2.63
RESET Pulse
Width (ms)
256
256
256
256
256
256
32
32
32
32
32
32
64
64
64
64
64
64
128
128
128
128
128
128
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
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, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
3-Pin, SOT23
Note 4:
These devices are available upon special request only. Please contact Fairchild sales for availability and minimum ordering requirements.
5
FM809/810 Rev. C
www.fairchildsemi.com
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