FM803RS3 [FAIRCHILD]
Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN;
| 型号： | FM803RS3 |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN 光电二极管 |
| 文件： | 总6页 (文件大小：45K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PRELIMINARY
August 2001
FM803
Precision Reset Generator Circuit
General Description
Features
The FM803 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
I Internal 5kΩ pull-up resistor
I Other reset pulse choices available: 32 - 256 ms
I Operating temperature -40°C to + 105°C
I Choice of Reset Thresholds: 4.63V, 4.38V, 4.00V, 3.08V,
2.93V, 2.63V
This device is fabricated using CMOS technology. This device is
available in the SOT-23 package.
I SOT23-3 Package
The FM803xx also can monitor a switch closure on its output,
enablingittorecognizeanexternalresetfromapushbuttonswitch
or a microprocessor. In the case of a switch, the closure will be
debounced by circuitry internal to the FM803xx.
Typical Operating Circuit
V
CC
3
FM803
Controller
1
2
/RESET
GND
Connection Diagram
1
GND
FM803 3 V
CC
/RESET
2
SOT23-3 Package
1
© 2001 Fairchild Semiconductor Corporation
FM803 Rev. A.3
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Rate of Rise of VCC
100V/µs
Absolute Maximum Ratings
Continuous Power Dissipation (TA = +70°C)
SOT23-3 (derate 4mW/°C above +70°C)
Voltage on any terminal relative to GND
320mW
-40°C to +105°C
-65°C to +150°C
+300°C
VCC
/RESET
-0.3V to +6.0V
-0.3V to +6.0V
Operating Temperature Range
Storage Temperature Range
Lead Temperature (soldering, 10s)
Input Current
20mA
20mA
Output Current: /RESET
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 (TA = 25°C unless otherwise noted)
VCC = full range, as noted under conditions. See Note 1.
Parameter
Symbol
Conditions
Min
Typ
Max
Units
(Note 2)
Operating Voltage
Supply Current
VCC
ICC
TA = -40°C to +135°C
1.1
5.5
10
V
TA = -40°C to +135°C, VCC < 5.5V
FM803J/L/M
TA = -40°C to +135°C, VCC < 3.6V
FM803R/S/T
5
3
µA
6
Reset Threshold
VTH
FM803L TA = -40°C to +105°C
FM803M TA = -40°C to +105°C
FM803J TA = -40°C to +105°C
FM803T TA = -40°C to +105°C
FM803S TA = -40°C to +105°C
FM803R TA = -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
4.86
4.52
4.18
3.19
3.00
2.70
V
Reset Threshold Tempco
VCC to Reset Delay
ppm/°C
µs
VCC = VTH to (VTH - 100mV)
10
Reset Active Timout Period
TA = -40°C to +105°C
140
256
560
0.3
ms
FM803 Output Low
VOL
VCC = VTH(min), ISINK = 1.2mA,
FM803R/S/T
V
VCC = VTH(min), ISINK = 3.2mA,
0.4
FM803J/L/M
VCC = < 1.0V, ISINK = 50µA
0.3
1
Open-Drain Output Leakage
Current
VCC > VTH(max), IRESET = 1
0.8VCC
µA
Pushbutton Detect
PBVDET
PBVREL
FM803L/M/J
1.8
0.8
3.3
V
FM803T/S/R
FM803L/M/J
2.0
1.5
Pushbutton Release
0.3
0.3
V
FM803T/S/R (Note 3)
1.5
Note 1: Testing in production is 25°C only. Limits over temperature are guaranteed by design.
Note 2: Typical values are at 25°C.
Note 3: It is recommended to connect a 100pF capacitor between the Reset pin and Ground pin if pushbutton reset is implemented.
2
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FM803 Rev. A.3
Pin Descriptions
Pin Number
Name
GND
Function
1
GROUND
2
/RESET
/RESET remains LOW while VCC is below
VTH, and for at least 140ms after VCC rises
above VTH
.
3
VCC
Circuit Timing (Ex: FM803)
V
CC
5V
V
TH
1V
GND
RESET
5V
V
TH
1V
GND
140ms
/Reset
PBRD
PBDV
tRST
When operating properly with 5V VCC (for example), /RESET will
also be about 5V. When VCC starts to fall, /RESET will follow it
down as shown. When VCC drops below VTH, /RESET drops to
ground ("issues a RESET") and stays there unless VCC also falls
belowitsminimumoperatingvoltage, approx. 1V. Atthispoint, the
supervisor loses control, and its output may rise, only to again
follow VCC down to the ground.
When VCC begins to rise, /RESET follows it until 1.0V or so is
reached, whereupon the device regains control, /RESET is pulled
to ground, etc. When VCC rises above VTH, /RESET 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 VCC ≤ 1V, a 100K resistor may be used on
the device output to GND.
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FM803 Rev. A.3
Typical Operating Characteristics
Supply Current Vs. Temperature
10
10
8
V
CC
= 5V
8
6
4
6
4
V
= 3.3V
CC
2
0
2
0
-55C
+25C
+110C
Temperature (C)
Power up Reset Timeout Vs. Temperature
600
600
500
400
300
200
100
500
400
300
200
100
-40C
+25C
+105C
Temperature (C)
Bi-Directional Reset
VCC
The FM803xx permits an external pushbutton to initiate a reset.
Such as connection to pin 2 will be debounced, RESET will go low
and recover in typically 250ms. For proper operation, the external
switch should be paralleled by an external capacitor of 100pF to
0.1F.
3
FM803
Controller
1
2
/RESET
GND
100pF
PUSH
BUTTON
4
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FM803 Rev. A.3
Ordering Information
Part
Top
RESET
RESET Pulse
Output
Package
Type
Number
Marking Threshold (V)
Width (ms)
256
256
256
256
256
256
32
Type
FM803LS3
03L
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
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
Open-Drain, active LOW
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
FM803MS3
03M
FM803JS3
03J
FM803TS3
03T
FM803SS3
03S
FM803RS3
03R
FM803LES3 (Note 4)
FM803MES3 (Note 4)
FM803JES3 (Note 4)
FM803TES3 (Note 4)
FM803SES3 (Note 4)
FM803RES3 (Note 4)
FM803LFS3 (Note 4)
FM803MFS3 (Note 4)
FM803JFS3 (Note 4)
FM803TFS3 (Note 4)
FM803SFS3 (Note 4)
FM803RFS3 (Note 4)
FM803LHS3 (Note 4)
FM803MHS3 (Note 4)
FM803JHS3 (Note 4)
FM803THS3 (Note 4)
FM803SHS3 (Note 4)
FM803RHS3 (Note 4)
03LE
03ME
03JE
03TE
03SE
03RE
03LF
03MF
03JF
03TF
03SF
03RF
03LH
03MH
03JH
03TH
03SH
03RH
32
32
32
32
32
64
64
64
64
64
64
128
128
128
128
128
128
Note 4: These devices are available upon special request only. Please contact Fairchild sales for availability and minimum ordering requirements.
5
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FM803 Rev. A.3
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
4F, Natsume Bldg.
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+49 (0) 8141-6102-0
+44 (0) 1793-856856
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Tokyo, 113-0034 Japan
Tel: 81-3-3818-8840
Fax: 81-3-3818-8841
Tel; +852-2722-8338
Fax: +852-2722-8383
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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FM803 Rev. A.3
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