MIC811UUY [MICROCHIP]
1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4;
| 型号： | MIC811UUY |
| 厂家： | 
MICROCHIP |
| 描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4 光电二极管 |
| 文件： | 总6页 (文件大小：97K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC811/812
Micrel, Inc.
MIC811/812
Microprocessor Reset Circuits
Final Information
General Description
Features
The MIC811 and MIC812 are inexpensive microprocessor
supervisory circuit that monitors power supplies in micropro-
cessor based systems.
• Precision voltage monitor for 3V, 3.3V or 5V power
supplies
• /RESET remains valid with V as low as 1.4V
CC
• <15µA supply current
The function of this device is to assert a reset if either the
power supply drops below a designated reset threshold level
or /MR is forced low. Several different reset threshold levels
are available to accommodate 3V, 3.3V or 5V powered
systems.
• 140ms minimum reset pulse width available
• Manual reset input
• Available in 4-pin SOT-143 package
Applications
The MIC811 has an active low /RESET output, while the
MIC812offersanactivehighRESEToutput.Theresetoutput
is guaranteed to remain asserted for a minimum of 140ms
• Portable equipment
• Intelligent instruments
• Critical microprocessor power monitoring
• Printers/computers
after V has risen above the designed reset threshold level.
CC
Having a push-pull output stage, MIC811/812 does not
require a pull-up resistor at the output. The MIC811/812
comes in a 4-pin SOT-143 package.
• Embedded controllers
If a microprocessor voltage supervisor with an open-drain
output stage is needed, see MIC6315.
Ordering Information
Standard
Pb-Free
Threshold
Operating
Part Number
Marking
KL
Part Number Marking
Voltage
4.63
4.38
4.00
3.00
3.08
2.93
2.63
4.63
4.38
4.00
3.00
3.08
2.93
2.63
Temp. Range
Package
MIC811LU
MIC811MU
MIC811JU
MIC811UU
MIC811TU
MIC811SU
MIC811RU
MIC812LU
MIC812MU
MIC812JU
MIC812UU
MIC812TU
MIC812SU
MIC812RU
MIC811LUY
MIC811MUY
MIC811JUY
MIC811UUY
MIC811TUY
MIC811SUY
MIC811RUY
MIC812LUY
MIC812MUY
MIC812JUY
MIC812UUY
MIC812TUY
MIC812SUY
MIC812RUY
KL
KM
KJ
KU
KT
KS
KR
LL
–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
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
4-lead SOT-143
KM
KJ
KU
KT
KS
KR
LL
LM
LJ
LM
LJ
LU
LU
LT
LS
LR
LT
LS
LR
*Under bar symbol (_) may not be to scale.
Typical Application
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
February 2005
1
MIC811/812
MIC811/812
Micrel, Inc.
Pin Configuration
MIC811 4-Lead SOT-143
MIC812 4-Lead SOT-143
Pin Description
Pin Number
Pin Number
MIC811
MIC812
1
Pin Name
GND
/RESET
Pin Function
IC Ground Pin
1
2
N/A
/RESET goes low if VCC falls below the reset threshold and remains
asserted for one reset timeout period (140ms min.) after VCC exceeds the
reset threshold
N/A
3
2
3
RESET
/MR
RESET goes high if VCC falls below the reset threshold and remains
asserted for one reset timeout period (140ms min.) after VCC exceeds the
reset threshold
Manual Reset Input. A logic low on /MR forces a reset. The reset will remain
asserted as long as /MR is held low and for one reset timeout period (140ms
min.) after /MR goes high. This input can be shorted to ground via a switch
or driven from CMOS or TTL logic. Float if unused.
4
4
VCC
Power Supply Input.
MIC811/812
2
February 2005
MIC811/812
Micrel, Inc.
Absolute Maximum Ratings(Note 1)
Operating Ratings(Note 2)
Terminal Voltage (V ) ............................... –0.3V to +6.0V
Operating Temperature Range
CC
MIC811..................................................... –40°C to 85°C
Input Current (V , /MR)............................................20mA
CC
MIC812..................................................... –40°C to 85°C
Output Current (/RESET, RESET) .............................20mA
Power Dissipation (T = +70°C)..............................320mW
A
Lead Temperature (soldering, 10 sec.) ..................... 300°C
Storage Temperature (T ) ......................... –65°C to 150°C
S
Rate of Rise (V ) ................................................. 100V/µs
CC
ESD Rating, Note 3
Electrical Characteristics
For typical values, VCC = 5V for MIC8_L/M/J, VCC = 3.3V for MIC8_S/T, VCC = 3V for MIC8_R; TA = 25°C, bold values indicate –40°C
≤ TA ≤ +85°C; unless noted
Symbol
VCC
Parameter
Operating Voltage Range
Condition
TA = 0°C to 70°C
TA = –40°C to 85°C
MIC811L/M/J, MIC812L/M/J:
VCC = 5.0V, no load
Min
1.4
1.6
Typ
Max
5.5
5.5
15
Units
V
V
ICC
Supply Current
9
6
µA
MIC811S/T, MIC812S/T
10
µA
VCC = 3.3V, no load
MIC811R, MIC812R: VCC = 3.0V, no load
MIC811L, MIC812L
MIC811M, MIC812M
MIC811J, MIC812J
MIC811T, MIC812T
6
10
µA
V
V
V
V
V
V
ms
V
VTH
Reset Voltage Threshold
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
MIC811S, MIC812S
MIC811R, MIC812R
tRST
VOH
Reset Timeout Period
/RESET Output Voltage
ISOURCE = 800µA, MIC811L/M/J
ISOURCE = 500µA, MIC811R/S/T
VCC–1.5V
0.8×VCC
V
VOL
/RESET Output Voltage
VCC = VTH min., ISINK = 3.2mA, MIC811L/M/J
VCC = VTH min., ISINK = 1.2mA, MIC811R/S/T
VCC > 1.4V, ISINK = 50µA, TA = 0°C to +70°C
VCC > 1.6V, ISINK = 50µA, TA = –40° to +85°C
1.8V < VCC < VTH min., ISOURCE = 150µA
ISINK = 3.2mA, MIC812L/M/J
0.4
0.3
0.3
0.3
V
V
V
V
V
V
V
VOH
VOL
RESET Output Voltage
RESET Output Voltage
0.8×VCC
0.4
0.3
ISINK = 1.2mA, MIC812R/S/T
/MR Minimum Pulse Width
/MR to Reset Delay
/MR Input Threshold
10
µs
µs
V
V
V
0.5
VIH
VIL
VCC > VTH max., MIC81_L/M/J
MIC81_R/S/T
VCC . VTH max., MIC81-L/M/_
2.3
0.7×VCC
/MR Input Threshold
0.8
MIC81_R/S/T
0.25
×
V
CC
/MR Pull-Up Resistance
/MR Glitch Immunity
10
20
100
30
kΩ
ns
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
February 2005
3
MIC811/812
MIC811/812
Micrel, Inc.
Timing Diagram
Reset Timing Diagram
Functional Diagram
MIC811/812
4
February 2005
MIC811/812
Micrel, Inc.
/RESET Valid at Low Voltage
Applications Information
A resistor can be added from the /RESET pin to ground to
Microprocessor Reset
ensure the /RESET output remains low with V down to 0V.
CC
The /RESET (or RESET) pin is asserted whenever V falls
CC
A 100kΩ resistor connected from the /RESET to ground is
recommended. The size of the resistor should be large
enough not to load the output excessively and small enough
to pull-down any stray leakage currents.
below the reset threshold voltage. The /RESET pin remains
asserted for a period of 140ms after V has risen above the
CC
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
V
CC
as low as 1.4V.
CC
V
Transients
The MIC811/812 are relatively immune to negative-going
V
glitches below the reset threshold. Typically, a negative-
CC
going transient 125mV below the reset threshold with a
duration of 50µs (25µs for MIC8_R/S/T) or less will not cause
a reset.
Interfacing to Bidirectional Reset Pins
The MIC811/812 can interface with µPs with bidirectional
reset pins by connecting a 4.7kΩ resistor in series with the
MIC811/812 output and the µP reset pin.
Reset Valid to V = 0V
CC
February 2005
5
MIC811/812
MIC811/812
Micrel, Inc.
Package Information
0.950 (0.0374) TYP
1.40 (0.055) 2.50 (0.098)
1.20 (0.047) 2.10 (0.083)
C
L
C
L
DIMENSIONS:
MM (INCH)
1.12 (0.044)
0.81 (0.032)
3.05 (0.120)
2.67 (0.105)
0.150 (0.0059)
0.089 (0.0035)
8°
0°
0.10 (0.004)
0.800 (0.031) TYP
0.41 (0.016)
0.013 (0.0005)
0.400 (0.016) TYP 3 PLACES
0.13 (0.005)
4-lead SOT-143 (M3)
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
This 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 a Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2003 Micrel, Incorporated.
MIC811/812
6
February 2005
相关型号：
MIC812JU
Power Supply Support Circuit, Fixed, 1 Channel, +4VV, CMOS, PDSO4, SOT-143, 4 PIN
MICROCHIP
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