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參數資料
| 型號： | MIC812UU |
| 廠商： | MICREL INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4 |
| 封裝： | SOT-143, SO-4 |
| 文件頁數： | 1/6頁 |
| 文件大小： | 99K |
| 代理商： | MIC812UU |
February 2005
1
MIC811/812
MIC811/812
Micrel, Inc.
MIC811/812
Microprocessor Reset Circuits
Final Information
General Description
The MIC811 and MIC812 are inexpensive microprocessor
supervisory circuit that monitors power supplies in micropro-
cessor based systems.
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.
The MIC811 has an active low /RESET output, while the
MIC812 offers an active high RESET output. The reset output
is guaranteed to remain asserted for a minimum of 140ms
after V
has risen above the designed reset threshold level.
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.
If a microprocessor voltage supervisor with an open-drain
output stage is needed, see MIC6315.
Ordering Information
Standard
Part Number
MIC811LU
MIC811MU
MIC811JU
MIC811UU
MIC811TU
MIC811SU
MIC811RU
MIC812LU
MIC812MU
MIC812JU
MIC812UU
MIC812TU
MIC812SU
MIC812RU
*Under bar symbol (_) may not be to scale.
Features
Precision voltage monitor for 3V, 3.3V or 5V power
supplies
/RESET remains valid with V
CC
as low as 1.4V
<15
A supply current
140ms minimum reset pulse width available
Manual reset input
Available in 4-pin SOT-143 package
Applications
Portable equipment
Intelligent instruments
Critical microprocessor power monitoring
Printers/computers
Embedded controllers
Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 http://www.micrel.com
Typical Application
Pb-Free
Threshold
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
Operating
Temp. Range
–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
Marking
KL
KM
KJ
KU
KT
KS
KR
LL
LM
LJ
LU
LT
LS
LR
Part Number
MIC811LUY
MIC811MUY
MIC811JUY
MIC811UUY
MIC811TUY
MIC811SUY
MIC811RUY
MIC812LUY
MIC812MUY
MIC812JUY
MIC812UUY
MIC812TUY
MIC812SUY
MIC812RUY
Marking
KL
KM
KJ
KU
KT
KS
KR
LL
LM
LJ
LU
LT
LS
LR
Package
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
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