MIC706MY [MICROCHIP]
IC,POWER SUPPLY SUPERVISOR,SOP,8PIN,PLASTIC;
| 型号： | MIC706MY |
| 厂家： | 
MICROCHIP |
| 描述： | IC,POWER SUPPLY SUPERVISOR,SOP,8PIN,PLASTIC 光电二极管 |
| 文件： | 总10页 (文件大小：431K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC705/706/707/708
µP Supervisory Circuit
General Description
Features
The MIC705, MIC706, MIC707, and MIC708 are
inexpensive microprocessor supervisory circuits that
monitor power supplies in microprocessor-based systems.
• Debounced manual reset input is TTL/CMOS
compatible
• Reset pulse width: 200ms
The circuit functions include
a
watchdog timer,
• Watchdog timer: 1.6s (MIC705/706)
• 4.65V or 4.40V precision voltage monitor
• Early power-fail warning or low-battery detect
microprocessor reset, power-failure warning, and
debounced manual reset input.
a
The MIC705 and MIC706 offer a watchdog timer function
while the MIC707 and MIC708 have an active-high reset
output in addition to the active-low reset output.
Applications
• Automotive systems
• Intelligent systems
• Critical microprocessor power monitoring
• Battery-powered computers
• Computers
Supply voltage monitor levels of 4.65V and 4.4V are
available. The MIC705 and MIC707 have a nominal reset
threshold level of 4.65V while the MIC706 and MIC708
have a 4.4V nominal reset threshold level. When the
supply voltage drops below the respective reset threshold
level, /RESET is asserted.
• Controllers
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
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
Revision 2.1
September 15, 2014
Micrel, Inc.
MIC705/706/707/708
Ordering Information
Part Number
MIC705MY
MIC706MY
MIC707MY
MIC708MY
Threshold (V)
4.65
/RESET
RESET
WDI
√
Junction Temperature Range
−40°C to +85°C
Package
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
√
√
√
√
4.40
√
−40°C to +85°C
4.65
√
√
−40°C to +85°C
4.40
−40°C to +85°C
Pin Configuration
MIC705/706
MIC707/708
8-Pin SOIC (M)
(Top View)
8-Pin SOIC (M)
(Top View)
Pin Description
Pin Number
MIC706
Pin Number
MIC708
Pin Name Pin Name
Manual reset input forces /RESET to assert when pulled below 0.8V. An internal
pull-up current of 250µA on this input forces it high when left floating. This input
can also be driven from TTL or CMOS logic.
1
1
/MR
2
3
2
3
VCC
GND
Primary supply input, +5V.
IC ground pin, 0V reference.
Power-Fail Input: Internally-connected to the power-fail comparator which is
referenced to 1.25V. The power-fail output (/PFO) remains high if PFI is above
1.25V. PFI should be connected to GND or VCC if the power-fail comparator is not
used.
4
5
4
5
PFI
Power-Fail Output: The power-fail comparator is independent of all other function
on this device.
/PFO
Watchdog Input. The WDI input monitors microprocessor activity; an internal
watchdog timer resets itself with each transition on the watchdog input. If the WDI
pin is held high or low for longer than the watchdog timeout period, /WDO is forced
to active low. The watchdog function can be disabled by floating the WDI pin.
6
N/A
6
WDI
N/C
N/A
Not internally connected.
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MIC705/706/707/708
Pin Description (Continued)
Pin Number
MIC706
Pin Number
MIC708
Pin Name Pin Name
/RESET is asserted if either VCC goes below the reset threshold voltage or by low
signal on the manual reset input (/MR). /RESET remains asserted for one reset
timeout period (200ms) after VCC exceeds the reset threshold voltage or after the
manual reset pin transition from low to high. The watchdog timer will not assert
/RESET unless /WDO is connected to /MR.
7
7
/RESET
Output for the watchdog timer. The watchdog timer resets itself with each transition
to the watchdog input. If the WDI pin is held high or low for longer than the
watchdog timeout period, /WDO is forced low. /WDO will also be forced low if VCC
is below the reset threshold voltage and will remain low until VCC returns to a valid
level.
8
N/A
8
/WDO
RESET is the compliment of /RESET and is asserted if either VCC goes below the
reset threshold voltage or by a low signal on the manual reset input (/MR). RESET
is suitable for microprocessor systems that use active high reset.
N/A
RESET
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September 15, 2014
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Micrel, Inc.
MIC705/706/707/708
Absolute Maximum Ratings(1)
Operating Ratings(2)
Terminal Voltage
Operating Temperature Range...................–40°C to +85°C
Power Dissipation (SOP) .........................................400mW
Thermal Resistance
VCC ....................................................... −0.3V to +6.0V
All Other Inputs............................−0.3V to (VCC + 0.3V)
Input Current
8-Pin SOIC.......................................................150°C/W
VCC, GND ............................................................25mA
Output Current (All).....................................................20mA
Lead Temperature (soldering, 10s)............................ 300°C
Storage Temperature (TS).........................−65°C to +150°C
Electrical Characteristics(3)
VCC = 4.75V to 5.5V for MIC705/707; VCC = 4.5V to 5.5V for MIC706/708; TA = Operating Temperature Range,
bold values indicate –40°C ≤ TA ≤ +85°C, unless noted.
Parameter
Condition
Min.
Typ.
Max.
5.5
Units
V
Operating Voltage Range
Supply Current
1.4
60
µA
MIC705, MIC707
MIC706, MIC708
4.50
4.25
4.65
4.4
40
4.75
4.5
Reset Voltage Threshold
V
Reset Threshold Hysteresis
mV
ms
Reset Pulse Width (tRS
)
140
200
280
0.4
ISOURCE = 800µA
ISINK = 3.2mA
VCC − 1.5V
/RESET Output Voltage
V
V
I
SOURCE = 800µA
VCC − 1.5V
RESET Output Voltage
ISINK = 1.2mA
0.4
Watchdog Timeout Period (tWD
)
1.0
50
1.6
2.25
s
WDI Minimum Input Pulse (tWP
)
VIL = 0.4V, VIH = 80% of VCC
VIH, VCC = 5V
ns
3.5
WDI Threshold Voltage
V
VIL, VCC = 5V
0.8
WDI = 0V
−150
VCC − 1.5V
100
−50
WDI Input Current
µA
WDI = VCC
50
150
I
SOURCE = 800µA
WDO Output Voltage
V
ISINK = 1.2mA
/MR = 0V
0.4
/MR Pull-Up Current
250
600
µA
Notes:
1. Exceeding the absolute maximum ratings may damage the device.
2. The device is not guaranteed to function outside its operating ratings.
3. Specification for packaged product only
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Micrel, Inc.
MIC705/706/707/708
Electrical Characteristics(3) (Continued)
VCC = 4.75V to 5.5V for MIC705/707; VCC = 4.5V to 5.5V for MIC706/708; TA = Operating Temperature Range,
bold values indicate –40°C ≤ TA ≤ +85°C, unless noted.
Parameter
Condition
Min.
Typ.
Max.
Units
/MR Pulse Width (tMR
)
150
ns
VIL
VIH
0.8
/MR Input Threshold
V
2.0
/MR-to-Reset Output Delay (tMD
)
250
1.3
ns
V
PFI Input Threshold
VCC = 5V
1.2
1.25
0.01
PFI Input Current
+25
0.4
nA
−25
ISINK = 3.2mA
/PFO Output Voltage
V
VCC = 5V, ISOURCE = 800µA
VCC − 1.5V
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Micrel, Inc.
MIC705/706/707/708
Timing Diagram
Figure 1. Timing Diagram for Reset
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Micrel, Inc.
MIC705/706/707/708
Block Diagrams
MIC705/MIC706 Block Diagram
MIC707/MIC708 Block Diagram
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Micrel, Inc.
MIC705/706/707/708
Application Information
Microprocessor Reset
Watchdog Timer
The /RESET pin is asserted whenever VCC falls below the
reset threshold voltage or when /MR goes low. The reset
pin remains asserted for a period of 200ms after VCC has
risen above the reset threshold voltage and /MR goes
high. The reset function ensures the microprocessor is
properly reset and powers up into a known condition after
a power failure. /RESET will remain valid with VCC as low
as 1.4V.
The microprocessor can be monitored by connecting the
WDI pin (watchdog input) to a bus line or an I/O line. If a
transition doesn't occur on the WDI pin within the
watchdog timeout period, then /WDO will go low. A
minimum pulse of 50ns or any transition low-to-high or
high-to-low on the WDI pin will reset the watchdog timer.
The output of the watchdog timer (/WDO) will remain high
if WDI left floating. If VCC falls below the reset threshold
voltage, then /WDO goes low immediately regardless of
WDI.
Power-Fail Warning
An additional comparator which is independent of the
other functions on the MIC706/706/707/708 is provided
for early warning of power failure. An external voltage
divider can be used to compare unregulated DC to an
internal 1.25V reference. The voltage divider ratio on the
input of the power-fail comparator (PFI) can be chosen so
as to trip the power-fail comparator a few milliseconds
before VCC falls below the maximum reset threshold
voltage. The output of the power-fail comparator (/PFO)
can be used to interrupt the microprocessor when used in
this mode and execute shutdown procedures prior to
power loss. Hysteresis can be added to this comparator
with external resistors, as is commonly done with any
comparator.
Figure 2. Power-Fail Comparator
Revision 2.1
September 15, 2014
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Micrel, Inc.
MIC705/706/707/708
Package Information and Recommended Landing Pattern(4)
8-Pin SOIC (M)
Note:
4. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com.
Revision 2.1
September 15, 2014
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Micrel, Inc.
MIC705/706/707/708
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
Micrel, Inc. is a leading global manufacturer of IC solutions for the worldwide high performance linear and power, LAN, and timing & communications
markets. The Company’s products include advanced mixed-signal, analog & power semiconductors; high-performance communication, clock
management, MEMs-based clock oscillators & crystal-less clock generators, Ethernet switches, and physical layer transceiver ICs. Company
customers include leading manufacturers of enterprise, consumer, industrial, mobile, telecommunications, automotive, and computer products.
Corporation headquarters and state-of-the-art wafer fabrication facilities are located in San Jose, CA, with regional sales and support offices and
advanced technology design centers situated throughout the Americas, Europe, and Asia. Additionally, the Company maintains an extensive network
of distributors and reps worldwide.
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this datasheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right.
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
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© 2000 Micrel, Incorporated.
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