Each FM809 device has the following Identifier (FM809yz) (Top Mark on devices will be 09yz)
Reset Characteristics
RESET THRESHOLD (V)
4.63
4.38
4.00
3.08
2.93
2.63
Identifier(y)
L
M
J
T
S
R
Fairchild Part Number
FM809Lz
FM809Mz
FM809Jz
FM809Tz
FM809Sz
FM809Rz
RESET PULSE DURATION (mS)
32
64
128
256
Identifier(z)
E
F
H
Blank
Fairchild Part Number
FM809yE*
FM809yF*
FM809yH*
FM809y
Note*:
These choices are available upon special request only. Please work with Fairchild Marketing to determine availability.
2
FM809 Rev. A.1
www.fairchildsemi.com
FM809 Precision Reset Generator Circuit
Product Specifications
Absolute Maximum Ratings
Ambient Storage Temperature
All Input or Output Voltages
with Respect to Ground
Lead Temperature (Soldering, 10 seconds)
ESD Rating
–65°C to +150°C
-0.3V to 6.5V
+300°C
2000V min.
Operating Conditions
Ambient Operating Temperature
Commercial
Industrial
0°C to +70°C
-40°C to +85°C
Electrical Characteristics
Parameter
V
CC
Range
I
ND
Supply Current
I
CC
Com
Symbol
Temp
Com
Conditions
Min
1.0
1.2
Typ
Max
5.5V
5.5
50
100
Units
V
V
µA
µA
V
V
V
V
V
V
V
V
V
V
V
V
V
V
Reset Threshold
V
TH
Com
Ind
Com
Ind
Com
Ind
Com
Ind
Com
Ind
Com
Ind
‘L’ Identifier
4.50
4.40
4.63
4.63
4.38
4.38
4.00
4.00
3.08
3.08
2.93
2.93
2.63
2.63
4.75
4.85
4.50
4.56
4.10
4.20
3.15
3.23
3.00
3.08
2.70
2.75
‘M’ Identifier
4.25
4.16
‘J’ Identifier
3.89
3.80
‘T’ Identifier
3.00
2.92
‘S’ Identifier
2.85
2.78
‘R’ Identifier
2.55
2.50
nRESET Output Voltage High
nRESET Output Voltage Low
Reset Timeout Period
V
OH
V
OL
T
RST
All
All
All
Isource = 150 mA
Isink = 1.2mA
0.8V
CC
0.4
175
240
375
ms
Note:
Production testing done at TA = +25°C, over temperature limits guaranteed by design only.
General Description
The FM809 features a highly accurate voltage reference against
which the Vcc is compared. Once the Vcc is below the specified
threshold, it will drive the RESET line and continue to hold it low
until the V
CC
returns above the threshold and the time for the
RESET pulse duration has expired. The FM809 is immune to short
negative going transients on the V
CC
line. The placement of a
0.1µF bypass capacitor as close as possible to the V
CC
pin
provides additional transient immunity.
For a V
CC
value below 1.0V-1.3V, the FM809 does not sink current
on the RESET pin.
This is not a problem in most systems since most common devices
are not functional in this range. If it is desired for the FM809 reset
to be functional below the range above, it is suggested to use a
100KΩ pull-down resistor between RESET and V
SS
.
Interfacing to Bidirectional reset pins
FM809 can be used with microprocessors with bidirectional reset
pins. In order to allow the microprocessor to drive the reset line, the
output of the FM809 must be connected to the microprocessor
through a 4.7kΩ resistor. This will ensure that the RESET line has
correct level at both the FM809 as well as the device end.
3
FM809 Rev. A.1
www.fairchildsemi.com
FM809 Precision Reset Generator Circuit
Typical Operating Characteristics
Supply Current Vs. Temperature (FM809R/S/T)
8
7
6
Icc (uA)
5
4
3
2
1
0
-60
-40
-20
0
V
V
20
40
60
80
100
Temperature (C)
Power up Reset Timeout Vs. Temperature FM809(R/S/T)
300
280
260
240
220
200
-60
-40
-20
0
20
40
60
80
100
Temperature (C)
Normalized Reset Threshold Vs. Temperature FM809(R/S/T)
1.050
1.025
1.000
0.975
0.950
-60
-40
-20
0
20
40
60
80
100
Temperature (C)
4
FM809 Rev. A.1
www.fairchildsemi.com
FM809 Precision Reset Generator Circuit
Physical Dimensions
inches (millimeters) unless otherwise noted
0.45~0.60
0.20 MIN
2.40
±0.10
0.40
±0.03
1.30
±0.10
0.03~0.10
0.38 REF
0.40
±0.03
0.96~1.14
2.90
±0.10
0.12
–0.023
+0.05
Dimensions in millimeters
0.97REF
0.95
±0.03
0.95
±0.03
1.90
±0.03
0.508REF
SOT-23 Package Dimensions
FS Pkg Code AU
Life Support Policy
Fairchild's products are not authorized for use as critical components in life support devices or systems without the express written
approval of the President of Fairchild Semiconductor Corporation. As used herein:
1. Life support devices or systems are devices or systems which,
(a) are intended for surgical implant into the body, or (b) support
or sustain life, and whose failure to perform, when properly
used in accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a significant
injury to the user.
Fairchild Semiconductor
Americas
Customer Response Center
Tel. 1-888-522-5372
Fairchild Semiconductor
Europe
Fax:
+44 (0) 1793-856858
Deutsch
Tel:
+49 (0) 8141-6102-0
English
Tel:
+44 (0) 1793-856856
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Tel:
+33 (0) 1-6930-3696
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Tel:
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2. A critical component is any component of a life support device
or system whose failure to perform can be reasonably ex-
pected to cause the failure of the life support device or system,
or to affect its safety or effectiveness.
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Hong Kong
8/F, Room 808, Empire Centre
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Kowloon. Hong Kong
Tel; +852-2722-8338
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Tokyo, 113-0034 Japan
Tel: 81-3-3818-8840
Fax: 81-3-3818-8841
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.
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