MIC6315
Open-Drain Microprocessor Reset Circuit
Features
General Description
• Precision Voltage Monitor for 3V, 3.3V, or 5V
Power Supplies
• /RESET Remains Valid with VCC as Low as 1V
• 5 µA Supply Current
• 20 ms, 140 ms, or 1100 ms Minimum Reset Pulse
Widths Available
• Manual Reset Input
• Available in 4-Pin SOT-143 Package
The MIC6315 is an inexpensive reset generator circuit
that monitors power supplies in microprocessor-based
systems.
Applications
•
•
•
•
•
Portable Equipment
Intelligent Instruments
Critical Microprocessor Power Monitoring
Printers/Computers
Embedded Controllers
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 MIC6315 has an active low, open-drain /RESET
output. The reset output remains asserted for a
minimum of either 20 ms, 140 ms, or 1100 ms after
VCC has risen above the designed reset threshold
level. The MIC6315 is available in a 4-pin SOT-143
package.
Package Type
MIC6315
4-Lead SOT-143 (U)
(Top View)
2021 Microchip Technology Inc.
DS20006450A-page 1
MIC6315
Typical Application Circuit
Functional Block Diagram
DS20006450A-page 2
2021 Microchip Technology Inc.
MIC6315
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Terminal Voltage
(VCC, /RESET) ........................................................................................................................... –0.3V to +6.0V
(/MR) ................................................................................................................................ –0.3V to (VCC + 0.3V)
Rate of Rise (VCC) .............................................................................................................................................. 100V/µs
Input Current (VCC, /MR)........................................................................................................................................20 mA
Output Current (/RESET) ........................................................................................................................................20 mA
ESD Rating (Note 1) .................................................................................................................................................. 3 kV
Operating Ratings ‡
Input Voltage (/RESET)...............................................................................................................................GND to +5.5V
Power Dissipation (TA = +70°C)...........................................................................................................................320 mW
† Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at those or any other conditions above those indicated
in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended
periods may affect device reliability.
‡ Notice: The device is not guaranteed to function outside its operating ratings.
Note 1: Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5 kΩ in series
with 100 pF.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics: For typical values, VCC = 2.5V to 5.5V; TA = +25°C, bold values valid for –40°C ≤ TA ≤
+85°C, unless noted.
Parameter
Symbol
Min.
Typ.
Max.
Units
Operating Voltage Range
VCC
1
—
5.5
V
Supply Current
ICC
—
5
15
—
5
10
Reset Voltage Threshold
VTH
VTH – 2.5%
VTH
VTH + 2.5%
20
28
44
140
200
320
1100
1500
2500
—
—
0.4
—
—
0.3
—
—
0.3
Reset Timeout Period
/RESET Output Voltage
tRST
VOL
µA
V
Conditions
—
VCC = 5.5V, no load
VCC = 3.6V, no load
Note 1
D2U
ms
D3U
D4U
VCC ≥ 4.0V, ISNK = 3.2 mA
V
VCC ≥ 2.5V, ISNK = 1.2 mA
VCC ≥ 1.0V, ISNK = 50 µA
/RESET Output Leakage
—
—
—
1
µA
/RESET deasserted
/MR Minimum Pulse
Width
—
10
—
—
µs
—
/MR-to-Reset Delay
—
—
0.5
—
µs
—
/MR Input Threshold
VIH
2.3
—
—
0.7 x VCC
—
—
Note 1:
V
VTH > 4.0V
VTH < 4.0V
Various reset thresholds available. See the Product Identification System section or contact Microchip.
2021 Microchip Technology Inc.
DS20006450A-page 3
MIC6315
ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Characteristics: For typical values, VCC = 2.5V to 5.5V; TA = +25°C, bold values valid for –40°C ≤ TA ≤
+85°C, unless noted.
Parameter
Symbol
Min.
Typ.
Max.
—
—
0.8
—
—
0.25 x VCC
Units
V
Conditions
VTH > 4.0V
/MR Input Threshold
VIL
/MR Pull-Up Resistance
—
10
20
30
kΩ
—
/MR Glitch Immunity
—
—
100
—
ns
—
Note 1:
VTH < 4.0V
Various reset thresholds available. See the Product Identification System section or contact Microchip.
TEMPERATURE SPECIFICATIONS
Parameters
Sym.
Min.
Typ.
Max.
Units
Junction Temperature Range
TJ
–40
—
+125
°C
Conditions
Temperature Ranges
Note 1
Operating Temperature Range
TA
–40
—
+85
°C
—
Storage Temperature Range
TS
–65
—
+150
°C
—
Lead Temperature
—
—
—
+300
°C
Soldering, 10 sec.
Note 1:
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable
junction temperature and the thermal resistance from junction to air (i.e., TA, TJ, JA). Exceeding the
maximum allowable power dissipation will cause the device operating junction temperature to exceed the
maximum +125°C rating. Sustained junction temperatures above +125°C can impact the device reliability.
Timing Diagram
DS20006450A-page 4
2021 Microchip Technology Inc.
MIC6315
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin Number
Pin Name
1
GND
2
/RESET
/RESET goes low if VCC falls below the reset threshold and remains asserted for one
reset timeout period after VCC exceeds the reset threshold.
3
/MR
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 after /MR goes HIGH.
This input can be shorted to ground via a switch or be driven by TTL or CMOS logic.
Float if unused.
4
VCC
Power supply input.
2021 Microchip Technology Inc.
Description
IC Ground.
DS20006450A-page 5
MIC6315
3.0
APPLICATION INFORMATION
3.1
Microprocessor Reset
The /RESET pin is asserted whenever VCC falls below
the reset threshold voltage or if /MR (manual reset) is
forced low. The /RESET pin remains asserted for the
duration of the reset timeout period after VCC has risen
above the reset threshold or /MR has returned high.
The reset function ensures the microprocessor is
properly reset and powers up in a known condition after
a power failure. /RESET will remain valid with VCC as
low as 1V.
The /RESET output is a simple open-drain N-channel
MOSFET structure. A pull-up resistor must be used to
pull this output up to some voltage. For most
applications, this voltage will be the same power supply
that supplies VCC to the MIC6315. It is possible,
however, to tie this resistor to some other voltage. This
will allow the MIC6315 to monitor one voltage while
level-shifting the /RESET output to some other voltage.
The pull-up voltage must be limited to 6.0V or less
(absolute maximum) to avoid damage to the MIC6315.
The resistor must be small enough to supply current to
the inputs and leakage paths that are driven by the
/RESET output.
3.2
3.3
Wire OR’ing the /RESET Output
Because the RESET output is open-drain, several
reset sources can be wire-OR’ed, in parallel, to allow
resets from multiple sources.
3.4
VCC Transients
The MIC6315 is relatively immune to negative-going
VCC glitches below the reset threshold. Typically, a
negative-going transient 125 mV below the reset
threshold with duration of 20 μs or less will not cause
an unwanted reset. If additional transient immunity is
needed, a bypass capacitor can be placed a close as
possible to the MIC6315.
/RESET Valid at Low Voltage
As VCC drops to 0V, the MIC6315 will no longer be able
to pull the /RESET output low. At this point, the pull-up
resistor will pull the output high. The value of the pull-up
resistor and the voltage it is connected to will affect the
point at which this happens.
DS20006450A-page 6
FIGURE 3-1:
MIC6315 as Used in a
Multiple Supply System.
2021 Microchip Technology Inc.
MIC6315
4.0
PACKAGING INFORMATION
4.1
Package Marking Information
4-Lead SOT-143*
Example
XX
MNNN
NW
9016
Legend: XX...X
Y
YY
WW
NNN
e3
*
Product code or customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC® designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
●, ▲, ▼ Pin one index is identified by a dot, delta up, or delta down (triangle
mark).
Note:
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information. Package may or may not include
the corporate logo.
Underbar (_) and/or Overbar (‾) symbol may not be to scale.
2021 Microchip Technology Inc.
DS20006450A-page 7
MIC6315
TABLE 4-1:
MARKING CODES
Part Number
Marking Code
Nominal VTH
Minimum tRST
MIC6315-26D2UY
NY
2.63V
20 ms
MIC6315-29D2UY
NM
2.93V
20 ms
MIC6315-30D2UY
N2
3.00V
20 ms
MIC6315-31D2UY
NF
3.08V
20 ms
MIC6315-40D2UY
NW
4.00V
20 ms
MIC6315-41D2UY
N6
4.10V
20 ms
MIC6315-44D2UY
NG
4.38V
20 ms
MIC6315-46D2UY
NQ
4.63V
20 ms
MIC6315-26D3UY
NR
2.63V
140 ms
MIC6315-26D3UY
NP
2.93V
140 ms
MIC6315-30D3UY
N3
3.00V
140 ms
MIC6315-31D3UY
NU
3.08V
140 ms
MIC6315-40D3UY
N8
4.00V
140 ms
MIC6315-41D3UY
N5
4.10V
140 ms
MIC6315-42D3UY
05
4.20V
140 ms
MIC6315-44D3UY
NH
4.38V
140 ms
MIC6315-46D3UY
NX
4.63V
140 ms
MIC6315-26D4UY
NS
2.63V
1100 ms
MIC6315-29D4UY
NN
2.93V
1100 ms
MIC6315-30D4UY
N4
3.00V
1100 ms
MIC6315-31D4UY
2N
3.08V
1100 ms
MIC6315-40D4UY
M9
4.00V
1100 ms
MIC6315-41D4UY
M7
4.10V
1100 ms
MIC6315-44D4UY
NJ
4.38V
1100 ms
MIC6315-46D4UY
NZ
4.63V
1100 ms
DS20006450A-page 8
2021 Microchip Technology Inc.
MIC6315
4-Lead SOT-143 Package Outline and Recommended Land Pattern
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging.
2021 Microchip Technology Inc.
DS20006450A-page 9
MIC6315
NOTES:
DS20006450A-page 10
2021 Microchip Technology Inc.
MIC6315
APPENDIX A:
REVISION HISTORY
Revision A (February 2021)
• Converted Micrel document MIC6315 to Microchip data sheet template DS20006450A.
• Minor grammatical text changes throughout.
2021 Microchip Technology Inc.
DS20006450A-page 11
MIC6315
NOTES:
DS20006450A-page 12
2021 Microchip Technology Inc.
MIC6315
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office.
Examples:
Device
-XX
XX
X
X
-XX
Part No.
Nominal
VTH
Min. Reset
Time
Package
Temp.
Range
Media Type
Device:
MIC6315:
Nominal VTH:
26
29
30
31
40
41
42
44
46
=
=
=
=
=
=
=
=
=
2.63V
2.93V
3.00V
3.08V
4.00V
4.10V
4.20V (D3 Reset Time Only)
4.38V
4.63V
Minimum Reset
Time:
D2
D3
D4
=
=
=
20 ms
140 ms
1100 ms
Package:
U
=
4-Lead SOT-143
a) MIC6315-26D2UY-TR:
MIC6315, 2.63V Nominal VTH
20 ms Min. Reset Time,
4-Lead SOT-143,
–40°C to +85°C Range,
3000/Reel
b) MIC6315-30D3UY-TR:
MIC6315, 3.00V Nominal VTH
140 ms Min. Reset Time,
4-Lead SOT-143,
–40°C to +85°C Range,
3000/Reel
c) MIC6315-44D4UY-TR:
MIC6315, 4.38V Nominal VTH
1100 ms Min. Reset Time,
4-Lead SOT-143,
–40°C to +85°C Range,
3000/Reel
d) MIC6315-46D2UY-TR:
MIC6315, 4.63V Nominal VTH
20 ms Min. Reset Time,
4-Lead SOT-143,
–40°C to +85°C Range,
3000/Reel
e) MIC6315-42D3UY-TR:
MIC6315, 4.20V Nominal VTH
140 ms Min. Reset Time,
4-Lead SOT-143,
–40°C to +85°C Range,
3000/Reel
f) MIC6315-29D4UY-TR:
MIC6315, 2.93V Nominal VTH
1100 ms Min. Reset Time,
4-Lead SOT-143,
–40°C to +85°C Range,
3000/Reel
Open-Drain Microprocessor Reset Circuit
Operating Temp.
Range:
Y
=
–40°C to +85°C
Media Type:
TR
=
3000/Reel
Note 1:
2021 Microchip Technology Inc.
Tape and Reel identifier only appears in the
catalog part number description. This identifier is
used for ordering purposes and is not printed on
the device package. Check with your Microchip
Sales Office for package availability with the
Tape and Reel option.
DS20006450A-page 13
MIC6315
NOTES:
DS20006450A-page 14
2021 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specifications contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is secure when used in the intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods being used in attempts to breach the code protection features of the Microchip
devices. We believe that these methods require using the Microchip products in a manner outside the operating specifications
contained in Microchip's Data Sheets. Attempts to breach these code protection features, most likely, cannot be accomplished
without violating Microchip's intellectual property rights.
•
Microchip is willing to work with any customer who is concerned about the integrity of its code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of its code. Code protection does not
mean that we are guaranteeing the product is "unbreakable." Code protection is constantly evolving. We at Microchip are
committed to continuously improving the code protection features of our products. Attempts to break Microchip's code protection
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other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication is provided for the sole
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It is your responsibility to ensure that your application meets
with your specifications.
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2021 Microchip Technology Inc.
ISBN: 978-1-5224-7761-7
DS20006450A-page 15
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DS20006450A-page 16
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