MIC810MUTR [MICREL]
Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN;
| 型号： | MIC810MUTR |
| 厂家： | 
MICREL 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：283K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Microprocessor Reset Circuits
General Description
The MIC809 and MIC810 are inexpensive microprocessor
supervisory circuits that monitor power supplies in micro-
processor based systems.
• Precision voltage monitor for 3V, 3.3V or 5V power sup-
plies
• /RESET remains valid with V as low as 1.4V for SOT-
CC
23 packaged part
• /RESET remains valid with VCC as low as 1V for SC70
packaged part
• Typically less than15µA supply current for SOT-23 pack-
aged part
• 5µ typical supply current for SC70 packaged part
• 140ms minimum reset pulse widths available
• Available in 3-pin SOT-23 and SC-70 package
The function of these devices is to assert a reset if the power
supplydropsbelowadesignatedresetthresholdlevel.Several
differentresetthresholdlevelsareavailabletoaccommodate
3V, 3.3V or 5V powered systems.
The MIC809 has an active-low /RESET output, while the
MIC810offersanactive-highRESEToutput.Theresetoutput
is guaranteed to remain asserted for a minimum of 140ms
after V
has risen above the designated reset threshold
CC
level. Having a push-pull output stage, the MIC809/810 does
not require a pull-up resistor at the output. The MIC809/810
comes in a 3-pin SOT-23 and SC-70 package.
Applications
• Portable equipment
• Intelligent instruments
• Critical microprocessor power monitoring
• Printers/computers
The MIC809 is also available with a shorter reset timeout
(30ms min.). See the MIC809-5.
All support documentation can be found on Micrel’s web site
at www.micrel.com.
• Controllers
Typical Application
V
CC
V
V
CC
µP
RESET
CC
MIC809
RESET
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
M0450-041405
April 2005
1
MIC809/810
Micrel
Ordering Information
Part Number
Lead Finish
Threshold
Voltage
Operating
Temp. Range
Marking
3-lead SOT-23 Package3-lead SC-70 Package
MIC809LU
MIC809MU
MIC809JU
MIC809LBC3
MIC809MBC3
MIC809JBC3
MIC809TBC3
MIC809SBC3
MIC809RBC3
MIC810LBC3
MIC810MBC3
MIC810JBC3
MIC810TBC3
MIC810SBC3
MIC810RBC3
MIC809LYC3
MIC809MYC3
MIC809JYC3
MIC809TYC3
MIC809SYC3
MIC809RYC3
MIC810LYC3
MIC810MYC3
MIC810JYC3
MIC810TYC3
MIC810SYC3
MIC810RYC3
IL
IM
IJ
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
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Standard
Standard
Standard
Standard
Standard
Standard
Standard
Standard
Standard
Standard
Standard
Standard
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
MIC809TU
MIC809SU
MIC809RU
MIC810LU
MIC810MU
MIC810JU
IT
IS
IR
JL
JM
JJ
JT
JS
JR
IL
MIC810TU
MIC810SU
MIC810RU
MIC809LUY
MIC809MUY
MIC809JUY
MIC809TUY
MIC809SUY
MIC809RUY
MIC810LUY
MIC810MUY
MIC810JUY
MIC810TUY
MIC810SUY
MIC810RUY
IM
IJ
IT
IS
IR
JL
JM
JJ
JT
JS
JR
Note: Contact factory for SC70 packaged Pb-free options..
Pin Configuration
1
2
GND
1
2
GND
V
CC
V
CC
3
3
MIC809
MIC810
RESET
RESET
MIC809 3-Lead SOT23 MIC810 3-Lead SOT23
MIC809 3-Lead SC70 MIC810 3-Lead SC70
Pin Description
Pin Number
Pin Number
Pin Name
Pin Function
MIC809
MIC810
1
2
1
GND
IC Ground Pin.
N/A
/RESET
/RESET goes low if VCC falls below the reset threshold and remains as-
serted for one reset timeout period (140ms min.) after VCC exceeds the reset
threshold.
N/A
3
2
3
RESET
VCC
RESET goes high if VCC falls below the reset threshold and remains as-
serted for one reset timeout period (140ms min.) after VCC exceeds the reset
threshold.
Power Supply Input.
M0450-041405
2
April 2005
MIC809/810
Micrel
Absolute Maximum Ratings(1)
Operating Ratings(2)
Terminal Voltage (V
)
–0.3V to 6.0V
20mA
Operating Temperature Range
CC
MIC809
MIC810
–40°C to 85°C
–40°C to 85°C
Input Current (V
)
CC
Output Current (RESET, /RESET)
20mA
Power Dissipation (T = +70°C)
320mW
Lead Temperature (soldering, 10 sec.)
300°C
Storage Temperature (T )
–65°C to 150°C
S
Rate of Rise (V
)
100V/µs
3kV (SC70 Package)
CC
(3)
ESD Rating
Electrical Characteristics(4)
For typical values, VCC = 5V for MIC8_L/M/J, VCC = 3.3V for MIC8_S/T, VCC = 3V for MIC8_R; T= 25°C, bold values indicate –40°C
≤ T≤ +85°C; unless noted.
Symbol
Parameter
Condition
Min
1.4
1.6
1
Typ
Max
5.5
5.5
5.5
15
Units
V
VCC
Operating Voltage Range
T= 0°C to 70°C
T= –40°C to 85°C
T= –40°C to 85°C
SOT-23 package
SOT-23 package
SC70 package
V
V
ICC
Supply Current
MIC809L/M/J, MIC810L/M/J SOT-23 Package
9
5
µA
µA
For SC-70 Package: MIC809L/M/J,
MIC810L/M/J
15
VCC < 3.6V, MIC809R/S/T, MIC810R/S/T
SOT-23 package
6
10
µA
For SC-70 Package: V < 3.6V,
MIC809R/S/T, MIC810R/S/T
CC
5
10
µA
V
VTH
Reset Voltage Threshold
MIC809L, MIC810L
4.50
4.25
3.89
3.00
2.85
2.55
140
4.63
4.38
4.00
3.08
2.93
2.63
240
4.75
4.50
4.10
3.15
3.00
2.70
560
MIC809M, MIC810M
MIC809J, MIC810J
V
V
MIC809T, MIC810T
V
MIC809S, MIC810S
MIC809R, MIC810R
V
V
t
VOH
Reset Timeout Period
/RESET Output Voltage
MIC809
ms
V
ISOURCE = 800µA, MIC809L/M/J
ISOURCE = 500µA, MIC809R/S/T
CC
0.8 VCC
V
V
/RESET Output Voltage MIC809 VCC = VTH min., ISINK = 3.2mA, MIC809L/M/J
VCC = VTH min., ISINK = 1.2mA, MIC809R/S/T
0.4
0.3
0.3
0.3
V
V
VCC > 1.4V, ISINK = 50µA, T= 0°C to +70°C
V
`
For SC-70 Package: VCC = 1V, ISINK = 50µA
V
T= –40°C to 85°C
VCC > 1.6V, ISINK = 50µA, T= –40° to +85°C
RESET Output Voltage MIC810 1.8V < VCC < VTH min., ISOURCE = 150µA
RESET Output Voltage MIC810 ISINK = 3.2mA, MIC810L/M/J
ISINK = 1.2mA, MIC810R/S/T
0.3
V
V
V
V
VOH
V
0.8 VCC
0.4
0.3
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
4. Specification for packaged product only.
April 2005
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M0450-041405
MIC809/810
Micrel
Timing Diagram
VCC
VTH
VTH
tRST
tRST
/RESET
Reset Timing Diagram
Functional Diagram
V
(3)
CC
+
RESET (2)
RESET (MIC810)
RESET
GENERATOR
Reset
Threshold (V)
-
GND (1)
M0450-041405
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April 2005
MIC809/810
Micrel
Interfacing to Bidirectional Reset Pins
Applications Information
The MIC809/810 can interface with µPs with bidirectional
reset pins by connecting a 4.7kΩ resistor in series with the
MIC809/810 output and the µP reset pin.
Microprocessor Reset
The /RESET (or RESET) pin is asserted whenever V falls
below the reset threshold voltage. The /RESET pin remains
asserted for a period of 140ms after V
CC
/RESET Valid at Low Voltage
has risen above
CC
the reset threshold voltage. The reset function ensures the
microprocessor is properly reset and powers up in a known
condition after a power failure. /RESET will remain valid with
A resistor can be added from the /RESET pin to ground to
ensure the /RESET output remains low with V
down to
CC
0V. A 100kΩ resistor connected from the /RESET to ground
is recommended. The resistor should be small enough to
pull-down any stray leakage currents and large enough not
to load the reset output. See Figure below.
V
as low as 1.4V (1V for SC-70 package).
CC
V
Transients
CC
TheMIC809/810arerelativelyimmunetonegative-goingV
CC
V
CC
glitchesbelowtheresetthreshold.Typically,anegative-going
transient 125mV below the reset threshold with a duration of
20µs or less (SC70 package) will not cause a reset.
V
CC
V
CC
MIC809
µP
RESET
RESET
100K
Reset Valid to V = 0V
CC
April 2005
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M0450-041405
MIC809/810
Micrel
Package Information
1.40 (0.055) 2.50 (0.098)
1.19 (0.047) 2.10 (0.083)
C
L
C
L
2.36 (0.093)
2.28 (0.090)
DIMENSION:S
MM (INCH)
1.15 (0.045)
3.05 (0.120)
2.67 (0.105)
0.76 (0.030)
0.15 (0.006)
0.076 (0.0030)
8
0
0.10 (0.004)
0.013 (0.0005)
0.445 (0.0175) TYP 3 PLACES
0.41 (0.016)
0.13 (0.005)
3-Lead SC-70 (C3)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s
use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2005 Micrel, Incorporated.
M0450-041405
6
April 2005
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