FM809JE [ETC]
Voltage Detector ; 电压检测器\n
| 型号： | FM809JE |
| 厂家： | 
ETC |
| 描述： | Voltage Detector
|
| 文件： | 总5页 (文件大小：54K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
August 2000
FM809
Precision Reset Generator Circuit
General Description
Features
The FM809 features comprehensive reset generation for
microcontroller/microprocessorbasedsystems. IfthesystemVCC
voltage level is determined to be in an out-of-tolerance state, the
device automatically generates a low-going reset signal. The
reset signal is held in the active state (low) for a specified duration
(minimum 140 ms) after the VCC returns to an in-tolerance state.
I Automatic reset generation on power-up
I Minimum 140 ms reset pulse — compatible with other similar
809 class devices
I Other reset pulse choices available: 32 - 256 ms
I Choice of commercial and extended temperature ranges
I Choice of Reset Thresholds: 4.63V, 4.38V, 4.00V, 3.08V,
2.93V, 2.63V
The FM809 is fabricated using CMOS technology. The FM809 is
available in the SOT-23 package.
I Package available: SOT-23
Block Diagram
VCC
Reset_out
(active low)
VCC Tolerance Detect
& Reset Monitor
Output
Stage
Temp. Compensated
Reference
Connection Diagram
1
1 = GND
2 = RESET'
3 = VCC
FM809
3
2
1
© 2000 Fairchild Semiconductor International
FM809 Rev. A.1
www.fairchildsemi.com
Each FM809 device has the following Identifier (FM809yz) (Top Mark on devices will be 09yz)
Reset Characteristics
RESET THRESHOLD (V) Identifier(y) Fairchild Part Number
4.63
4.38
4.00
3.08
2.93
2.63
L
M
J
FM809Lz
FM809Mz
FM809Jz
FM809Tz
FM809Sz
FM809Rz
T
S
R
RESET PULSE DURATION (mS) Identifier(z) Fairchild Part Number
32
64
E
F
FM809yE*
FM809yF*
FM809yH*
FM809y
128
256
H
Blank
Note*: These choices are available upon special request only. Please work with Fairchild Marketing to determine availability.
2
www.fairchildsemi.com
FM809 Rev. A.1
Product Specifications
Absolute Maximum Ratings
Ambient Storage Temperature
Operating Conditions
Ambient Operating Temperature
–65°C to +150°C
Commercial
Industrial
0°C to +70°C
-40°C to +85°C
All Input or Output Voltages
with Respect to Ground
-0.3V to 6.5V
+300°C
Lead Temperature (Soldering, 10 seconds)
ESD Rating
2000V min.
Electrical Characteristics
Parameter
Symbol
Temp
Conditions
Min
1.0
Typ
Max Units
VCC Range
Com
5.5V
5.5
V
V
IND
ICC
1.2
Supply Current
Com
50
µA
µA
V
100
Reset Threshold
VTH
Com
Ind
‘L’ Identifier
‘M’ Identifier
‘J’ Identifier
‘T’ Identifier
‘S’ Identifier
‘R’ Identifier
4.50
4.40
4.25
4.16
3.89
3.80
3.00
2.92
2.85
2.78
2.55
2.50
0.8VCC
0.4
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
V
Com
Ind
V
V
Com
Ind
V
V
Com
Ind
V
V
Com
Ind
V
V
Com
Ind
V
V
nRESET Output Voltage High
nRESET Output Voltage Low
Reset Timeout Period
VOH
VOL
All
Isource = 150 mA
Isink = 1.2mA
V
All
V
TRST
All
175
240
375
ms
Note: Production testing done at TA = +25°C, over temperature limits guaranteed by design only.
General Description
Thisisnotaprobleminmostsystemssincemostcommondevices
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
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 VCC returns above the threshold and the time for the
RESETpulsedurationhasexpired.TheFM809isimmunetoshort
negative going transients on the VCC line. The placement of a
0.1µF bypass capacitor as close as possible to the VCC pin
provides additional transient immunity.
100KΩ pull-down resistor between RESET and VSS
.
Interfacing to Bidirectional reset pins
FM809 can be used with microprocessors with bidirectional reset
pins.Inordertoallowthemicroprocessortodrivetheresetline,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.
ForaVCC valuebelow1.0V-1.3V, theFM809doesnotsinkcurrent
on the RESET pin.
3
www.fairchildsemi.com
FM809 Rev. A.1
Typical Operating Characteristics
Supply Current Vs. Temperature (FM809R/S/T)
8
7
6
5
4
3
2
1
0
-60
-40
-20
0
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
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FM809 Rev. A.1
Physical Dimensions inches (millimeters) unless otherwise noted
0.40 0.03
0.03~0.10
0.38 REF
+0.05
–0.023
0.40 0.03
0.12
0.96~1.14
2.90 0.10
Dimensions in millimeters
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)areintendedforsurgicalimplantintothebody,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.
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.
Fairchild Semiconductor
Americas
Fairchild Semiconductor
Europe
Fairchild Semiconductor
Hong Kong
Fairchild Semiconductor
Japan Ltd.
Customer Response Center
Tel. 1-888-522-5372
Fax:
Tel:
Tel:
Tel:
Tel:
+44 (0) 1793-856858
8/F, Room 808, Empire Centre
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Kowloon. Hong Kong
Tel; +852-2722-8338
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Deutsch
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+49 (0) 8141-6102-0
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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.
5
www.fairchildsemi.com
FM809 Rev. A.1
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