MIC706RMY [MICROCHIP]
2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8;
| 型号： | MIC706RMY |
| 厂家： | 
MICROCHIP |
| 描述： | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 输入元件 光电二极管 |
| 文件： | 总10页 (文件大小：442K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC706P/R/S/T, MIC708R/S/T
µP Supervisory Circuit
General Description
Features
The MIC706 and MIC708 are inexpensive microprocessor
supervisory circuits that monitor power supplies in 3.0V
and 3.3V microprocessor-based systems. The circuit
functions include a watchdog timer, microprocessor reset,
power-failure warning, and a debounced manual reset
input.
• Maximum supply current: 30µA
• Debounced manual reset input is TTL/CMOS
compatible
• Reset pulse width: 200ms
• Watchdog timer: 1.6s (MIC706)
• Precision supply voltage monitor
• Easy power-fail warning or low-battery detect
The MIC706 offers a watchdog timer function, while the
MIC708 has an active-high reset output in addition to the
active-low reset output.
Applications
The R, S, and T versions are similar in all respects except
for supply voltage reset threshold levels. The threshold
levels are 2.63, 2.93, and 3.08V, respectively. When the
supply voltage drops below the reset threshold level,
/RESET (and RESET for the MIC708) is asserted.
• Laptop and desktop computers
• Intelligent systems
• Critical microprocessor power monitoring
• Printers
The MIC706P is identical to the MIC706R, except that the
Reset output is asserted high.
• 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 2.0
May 28, 2014
Micrel, Inc.
MIC706P/R/S/, MIC708R/S/T
Ordering Information
Part Number
MIC706PMY
MIC706RMY
MIC706SMY
MIC706TMY
MIC708RMY
MIC708SMY
MIC708TMY
Threshold (V)
2.63
/RESET
RESET
WDI
Junction Temperature Range
Package
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
8-Pin SOIC
√
√
√
√
√
–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
2.63
√
√
√
√
√
√
2.93
3.08
2.63
√
√
√
2.93
3.08
Pin Configuration
MIC706
MIC708
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 outputs 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 VOUT 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.
Revision 2.0
May 28, 2014
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Micrel, Inc.
MIC706P/R/S/, MIC708R/S/T
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
8
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.
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.
7
RESET
(MIC706P)
Revision 2.0
May 28, 2014
3
Micrel, Inc.
MIC706P/R/S/, MIC708R/S/T
Absolute Maximum Ratings(1)
Operating Ratings(2)
Terminal Voltage
Operating Temperature Range...................–40°C to +85°C
Power Dissipation (SOP) .........................................400mW
Thermal Resistance
V
CC ......................................................... −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 = 2.70V to 5.5V for MIC70_P/R; VCC = 3.00V to 5.5V for MIC70_S; VCC = 3.15V to 5.5V for MIC70_T.
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
30
µA
MIC70_P/R
MIC70_S
MIC70_T
2.55
2.85
3.00
2.63
2.93
3.08
20
2.70
3.00
3.15
Reset Voltage Threshold
V
Reset Threshold Hysteresis
mV
ms
Reset Pulse Width (tRS
)
140
200
280
ISOURCE = 200µA
ISINK = 1.2mA
0.8 × VCC
/RESET Output Voltage (MIC70_R/S/T)
0.3
0.3
V
V
ISINK = 50µA, VCC = 1.4V
ISOURCE = 200µA
ISINK = 1.2mA
0.8 × VCC
0.8 × VCC
RESET Output Voltage (MIC706P)
0.3
ISOURCE = 200µA
ISINK = 500µA
RESET Output Voltage (MIC708R/S/T)
V
s
0.3
Watchdog Timeout Period (tWD
)
1.0
100
1.6
2.25
VIL = 0.4V, VIH = 80% of VCC
WDI Minimum Input Pulse (tWP
)
ns
50
VIL = 0.4V, VIH = 80% of VCC > 4.5V
VIH
0.7 × VCC
WDI Threshold Voltage
WDI Input Current
V
µA
V
VIL
0.6
1
WDI = 0V or VCC
ISOURCE = 200µA
ISINK = 500µA
/MR = 0V
−1
0.8 × VCC
WDO Output Voltage
0.3
/MR Pull-Up Current
20
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.
Revision 2.0
May 28, 2014
4
Micrel, Inc.
MIC706P/R/S/, MIC708R/S/T
Electrical Characteristics(3) (Continued)
VCC = 2.70V to 5.5V for MIC70_P/R; VCC = 3.00V to 5.5V for MIC70_S; VCC = 3.15V to 5.5V for MIC70_T.
TA = Operating Temperature Range, bold values indicate –40°C ≤ TA ≤ +85°C, unless noted.
Parameter
Condition
Min.
500
150
Typ.
Max.
Units
/MR Pulse Width (tMR
)
ns
VCC > 4.5V
VIL
VIH
0.6
/MR Input Threshold
V
0.7 × VCC
/MR-to-Reset Output Delay (tMD
)
750
1.3
ns
V
PFI Input Threshold
1.2
1.25
0.01
PFI Input Current
+25
0.3
nA
−25
ISINK = 1.2mA
/PFO Output Voltage
V
ISOURCE = 200µA
0.8 × VCC
Revision 2.0
May 28, 2014
5
Micrel, Inc.
MIC706P/R/S/, MIC708R/S/T
Timing Diagram
Figure 1. Timing Diagram for Reset
Revision 2.0
May 28, 2014
6
Micrel, Inc.
MIC706P/R/S/, MIC708R/S/T
Block Diagram
MIC706 Block Diagram
MIC708 Block Diagram
Revision 2.0
May 28, 2014
7
Micrel, Inc.
MIC706P/R/S/, MIC708R/S/T
Watchdog Timer
Application Information
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 in the
watchdog timeout period, then /WDO will go low. A
minimum pulse of 100ns 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 sees a valid transition within the watchdog period.
If VCC falls below the reset threshold voltage, then /WDO
goes low immediately regardless of WDI. /WDO can be
connected to /MR to generate a reset pulse upon
watchdog timeout.
An additional comparator which is independent of the
other functions on the MIC706P and MIC708 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.
Microprocessor Reset
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.
Figure 2. Power-Fail Comparator
Revision 2.0
May 28, 2014
8
Micrel, Inc.
MIC706P/R/S/, MIC708R/S/T
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 2.0
May 28, 2014
9
Micrel, Inc.
MIC706P/R/S/, MIC708R/S/T
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 makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. 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
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.
© 2000 Micrel, Incorporated.
Revision 2.0
May 28, 2014
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