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MIC809_U [MICREL]

Microprocessor Reset Circuits; 微处理器复位电路
MIC809_U
型号： MIC809_U
厂家： MICREL SEMICONDUCTOR    MICREL SEMICONDUCTOR
描述：

Microprocessor Reset Circuits
微处理器复位电路

微处理器 复位电路
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MIC809/MIC810 Microprocessor Reset Circuits  
MIC809/MIC810  
Microprocessor Reset Circuits  
Description  
Pin Configuration  
The MIC809/MIC810 are inexpensive microprocessor  
supervisory circuits that monitor power supplies in  
microprocessor based systems.  
Top View  
The function of these devices is to assert a reset if the  
power supply drops below a designated reset threshold  
level. Several different reset threshold levels are  
available to accomodate 3V, 3.3V or 5V powered  
systems.  
The MIC809 has an active low RESET output, while the  
MIC810 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 designated  
reset threshold level. The MIC809/MIC810 come in a 3-  
pin SOT-23 package.  
Features  
Typical Applications  
RESET Remains Valid with V  
as 1.4V  
as Low  
CC  
·
·
Portable Equipment  
·
Intelligent Instruments  
·
Precision Voltage Monitor for 3V, 3.3V  
or 5V Power Supplies  
Critical Microprocessor Power Monitoring  
·
Printers/Computers  
·
Available in 3-Pin SOT23 Package  
<15µA Supply Current  
·
·
·
·
Controllers  
·
Reset Threshold  
Voltage (V)  
Device  
Suffix  
140ms Minimum Reset Pulse Width  
No External Components Required  
4.63  
4.38  
4.00  
3.08  
2.93  
2.63  
L
M
J
T
S
R
Typical Operating Circuit  
Ordering Information  
Part  
Package  
Temp. Range  
-40°C to +85°C  
-40°C to +85°C  
MIC809_U  
MIC810_U  
3-Lead SOT23  
3-Lead SOT23  
Place the device suffix of desired reset threshold voltage from table above in  
blank to complete the part number.  
1
MIC809/MIC810 Microprocessor Reset Circuits  
Absolute Maximum Ratings  
Terminal Voltage  
. . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.0V  
Operating Temperature Range  
V
MIC809 U, MIC810 U . . . . . . . . . . . . . . . -40°C to 85°C  
CC  
-
-
Storage Temperature Range . . . . . . . . . . . . .-65°C to 150°C  
Lead Temperature (Soldering - 10 sec.) . . . . . . . . . . . 300°C  
Input Current, V , . . . . . . . . . . . . . . . . . . . . . . . 20mA  
CC  
Output Current, RESET, RESET . . . . . . . . . . . . . .20mA  
Power Dissipation (T = +70°C) . . . . . . . . . . . . . . . . 320mW  
A
Rate of Rise, V  
. . . . . . . . . . . . . . . . . . . . . . 100V/µs  
CC  
Stresses above those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent device failure. Functionality at or above these limits is not implied. Exposure to absolute  
maximum ratings for extended periods may affect device reliability. Operating ranges define those limits between which the functionality of the device is guaranteed.  
Electrical Characteristics  
V
= Operating Temperature Range, unless  
= 5V for MIC8--L/M/J, V = 3.3V for MIC8--S/T, V = 3V for MIC8--R, T  
CC  
CC  
CC  
A
otherwise noted.  
Parameter  
Conditions  
Min  
Typ  
Max  
Units  
Operating Voltage Range, V  
T
T
A
= 0°C to 70°C  
= -40°C to 85°C  
1.4  
1.6  
5.5  
5.5  
V
A
CC  
Supply Current, I  
MIC809L/M/J, MIC810L/M/J  
< 3.6V, MIC809R/S/T, MIC810R/S/T  
9
6
15  
10  
µA  
CC  
V
CC  
Reset Voltage Threshold, V  
MIC809L, MIC810L  
MIC809M, MIC810M  
MIC809J, MIC810J  
MIC809T, MIC810T  
MIC809S, MIC810S  
MIC809R, MIC810R  
4.50  
4.25  
3.89  
3.00  
2.85  
2.55  
4.63  
4.38  
4.00  
3.08  
2.93  
2.63  
4.75  
4.50  
4.10  
3.15  
3.00  
2.70  
V
TH  
Reset Timeout Period  
140  
240  
560  
ms  
V
RESET Output Voltage, V  
RESET Output Voltage, V  
I
I
= 800µA, MIC809L/M/J  
= 500µA, MIC809R/S/T  
V
- 1.5V  
CC  
OH  
Source  
Source  
0.8 X  
V
CC  
V
V
V
V
=V  
=V  
Min., I  
Min., I  
=3.2mA, MIC809L/M/J  
=1.2mA, MIC809R/S/T  
0.4  
0.3  
0.3  
0.3  
V
OL  
TH  
TH  
CC  
CC  
CC  
CC  
Sink  
Sink  
>1.4V, I  
>1.6V, I  
=50µA,  
=50µA,  
T
T
A
= 0°C to 70°C  
= -40°C to 85°C  
A
Sink  
Sink  
RESET Output Voltage, V  
RESET Output Voltage, V  
1.8V < V  
< V  
Min.,  
0.8 X  
V
V
V
OH  
OL  
TH  
CC  
CC  
I
= 150µA  
Source  
I
I
=3.2mA, MIC810L/M/J  
=1.2mA, MIC810R/S/T  
0.4  
0.3  
Sink  
Sink  
2
MIC809/MIC810 Microprocessor Reset Circuits  
Pin Functions  
Pin No.  
Pin Name  
GND  
MIC809  
MIC810  
1
2
1
IC Ground Pin.  
RESET  
N/A  
RESET goes low if V  
falls below the reset threshold and remains  
CC  
asserted for one reset timeout period (140ms min.) after V  
the reset threshold.  
exceeds  
CC  
RESET  
N/A  
3
2
3
RESET goes high if V  
asserted for one reset timeout period (140ms min.) after V  
the reset threshold.  
falls below the reset threshold and remains  
CC  
exceeds  
CC  
V
Power supply input, 3V, 3.3V or 5V.  
CC  
3
MIC809/MIC810 Microprocessor Reset Circuits  
Block Diagram  
Figure 1. MIC809/810 Block Diagram  
4
MIC809/MIC810 Microprocessor Reset Circuits  
Circuit Description  
Microprocessor Reset  
The RESET pin is asserted whenever V  
falls below  
CC  
the reset threshold voltage. The reset pin remains  
asserted for a period of 240ms after V has risen  
CC  
above the reset threshold voltage. 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 V  
as low as 1.4V.  
CC  
Figure 2. Reset Timing Diagram  
V
Transients  
CC  
The MIC809/MIC810 are relatively immune to negative-  
going V glitches below the reset threshold. Typically,  
CC  
a negative-going transient 125mV below the reset  
threshold with a duration of 50µs (25µs for  
MIC8__R/S/T) or less will not cause an unwanted reset.  
Interfacing to Bidirectional Reset Pins  
The MIC809/MIC810 can interface with µPs with  
bidirectional reset pins by connecting a 4.7KΩ resistor in  
series with the MIC809/MIC810 output and the µP reset  
pin.  
RESET Valid to 0V  
A resistor can be added from the RESET pin to ground  
to ensure the RESET output remains low with V  
CC  
down to 0V. A 100KΩ resistor connected from RESET  
to ground is recommended. The size of the resistor  
should be large enough to not load the RESET output  
and small enough to pull-down any stray leakage  
currents.  
Figure 3. RESET Valid to V  
CC  
= OV  
5
MIC809/MIC810 Microprocessor Reset Circuits  
Alternate Source Cross Reference Guide  
MIC Direct  
Industry P/N  
MAX809JEUR-T  
MAX809LEUR-T  
MAX809MEUR-T  
MAX809REUR-T  
MAX809SEUR-T  
MAX809TEUR-T  
MAX810JEUR-T  
MAX810LEUR-T  
MAX810MEUR-T  
MAX810REUR-T  
MAX810SEUR-T  
MAX810TEUR-T  
Replacement  
MIC809JU  
MIC809LU  
MIC809MU  
MIC809RU  
MIC809SU  
MIC809TU  
MIC810JU  
MIC810LU  
MIC810MU  
MIC810RU  
MIC810SU  
MIC810TU  
6
MIC809/MIC810 Microprocessor Reset Circuits  
Packaging Information  
U Package, 3-Pin SOT-23 Small-Outline Transistor Package  
Dimensions are in inches.  
Device Marking Information  
Lot Code  
IJXX = MIC809J  
ILXX = MIC809L  
IMXX = MIC809M  
IRXX = MIC809R  
ISXX = MIC809S  
ITXX = MIC809T  
JJXX = MIC810J  
JLXX = MIC810L  
JMXX = MIC810M  
JRXX = MIC810R  
JSXX = MIC810S  
JTXX = MIC810T  
7
MIC809/MIC810 Microprocessor Reset Circuits  
Packaging Information  
Tape and Reel Information  
Dimensions are in millimeters.  
8

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