ETC811 반도체 회로 부품 판매점
(ETC812) Microprocessor Reset Circuits
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 Micrel |
MIC811/812
MIC811/812
Microprocessor Reset Circuits
Final Information
Micrel
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 VCC has risen above the designed reset threshold level.
The MIC811/812 comes in a 4-pin SOT-143 package.
Features
• Precision voltage monitor for 3V, 3.3V or 5V power
supplies
• /RESET remains valid with VCC as low as 1.4V
• <15µA 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
Ordering Information
Part Number
MIC811LU
MIC811MU
MIC811JU
MIC811TU
MIC811SU
MIC811RU
MIC812LU
MIC812MU
MIC812JU
MIC812TU
MIC812SU
MIC812RU
Marking
KL
KM
KJ
KT
KS
KR
LL
LM
LJ
LT
LS
LR
Threshold
Voltage
4.63
4.38
4.00
3.08
2.93
2.63
4.63
4.38
4.00
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
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
Typical Application
VCC
VCC
MIC81 1
RESET
MR
VCC
µP
RESET
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
May 2003
1 MIC811/812
MIC811/812
Pin Configuration
GND 1
RESET 2
MIC81 1
4 VCC
3 MR
GND 1
RESET 2
MIC812
4 VCC
3 MR
MIC811 4-Lead SOT-143
MIC812 4-Lead SOT-143
Micrel
Pin Description
Pin Number
MIC811
1
2
Pin Number
MIC812
1
N/A
N/A 2
33
44
Pin Name
GND
/RESET
RESET
/MR
VCC
Pin Function
IC Ground Pin
/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
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.
Power Supply Input.
MIC811/812
2
May 2003
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ETC811 data
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국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
[ 홈페이지 ]
IGBT, TR 모듈, SCR, 다이오드모듈, 각종 전력 휴즈
( IYXS, Powerex, Toshiba, Fuji, Bussmann, Eaton )
전력반도체 문의 : 010-3582-2743
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