MIC6315
Open-Drain µP Reset Circuit
General Description
The MIC6315 is an inexpensive reset generator circuit that
monitors power supplies in microprocessor-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 MIC6315 has an active low, open-drain /RESET
output. The reset output is guaranteed to remain asserted
for a minimum of either 20ms, 140ms, or 1100ms after V
CC
has risen above the designed reset threshold level. The
MIC6315 is available in a 4-pin SOT-143 package.
Datasheets and support documentation are available on
Micrel’s web site at:
www.micrel.com.
Features
•
Precision voltage monitor for 3V, 3.3V, or 5V power
supplies
•
/RESET remains valid with V
CC
as low as 1V
•
5μA supply current
•
20ms, 140ms, or 1100ms minimum reset pulse widths
available
•
Manual reset input
•
Available in 4-pin SOT-143 package
Applications
•
•
•
•
•
Portable equipment
Intelligent instruments
Critical microprocessor power monitoring
Printers/computers
Embedded controllers
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
October 17, 2014
Revision 2.0
Micrel, Inc.
MIC6315
Ordering Information
Part Number
(1,
2)
Marking
NY
NM
N2
NF
NW
N6
NG
NQ
NR
NP
N3
NU
N8
N5
05
NH
NX
NS
NN
N4
2N
M9
M7
NJ
NZ
(3)
Nominal V
TH
(V)
2.63
2.93
3.00
3.08
4.00
4.10
4.38
4.63
2.63
2.93
3.00
3.08
4.00
4.10
4.20
4.38
4.63
2.63
2.93
3.00
3.08
4.00
4.10
4.38
4.63
Minimum t
RST
(ms)
20
20
20
20
20
20
20
20
140
140
140
140
140
140
140
140
140
1100
1100
1100
1100
1100
1100
1100
1100
Operating
Temperature
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
–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
–40°C to +85°C
Package
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
4-Pin SOT-143
Lead Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
MIC6315-26D2UY
MIC6315-29D2UY
MIC6315-30D2UY
MIC6315-31D2UY
MIC6315-40D2UY
MIC6315-41D2UY
MIC6315-44D2UY
MIC6315-46D2UY
MIC6315-26D3UY
MIC6315-29D3UY
MIC6315-30D3UY
MIC6315-31D3UY
MIC6315-40D3UY
MIC6315-41D3UY
MIC6315-42D3UY
MIC6315-44D3UY
MIC6315-46D3UY
MIC6315-26D4UY
MIC6315-29D4UY
MIC6315-30D4UY
MIC6315-31D4UY
MIC6315-40D4UY
MIC6315-41D4UY
MIC6315-44D4UY
MIC6315-46D4UY
Note:
1. Ship format Tape and reel only (ordering part number add space TR example. MIC6315-26D2UY TR).
2. Standard reel quantity is 3000 pieces.
Reel diameter 7in. / Hub diameter 2in. / Width 8mm.
3. Underbar symbol ( _ ) may not be to scale.
October 17, 2014
2
Revision 2.0
Micrel, Inc.
MIC6315
Pin Configuration
4-Pin SOT-143 (U)
(Top View)
Pin Description
Pin Number
1
2
Pin Name
GND
/RESET
Pin Function
IC Ground.
/RESET goes low if V
CC
falls below the reset threshold and remains asserted for one reset
timeout period after V
CC
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 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.
Power Supply Input.
3
4
/MR
VCC
October 17, 2014
3
Revision 2.0
Micrel, Inc.
MIC6315
Absolute Maximum Ratings
(4)
Terminal Voltage
(VCC, /RESET). .....................................
−0.3V
to +6.0V
(/MR) ............................................
−0.3V
to (V
CC
+ 0.3V)
Rate-of-Rise (VCC) ................................................. 100V/µs
Input Current (VCC, /MR) ............................................ 20mA
Output Current (/RESET) ............................................ 20mA
Lead Temperature (soldering, 10s) ............................ 300°C
Storage Temperature (T
S
) .........................
−65°C
to +150°C
(6)
ESD Rating .................................................................. 3kV
Operating Ratings
(5)
Input Voltage (/RESET).................................... GND to 5.5V
Operating Temperature Range ................... –40°C to +85°C
Junction Temperature (T
J
) ........................ –40°C to +125°C
Power Dissipation (T
A
= +70°C) ............................... 320mW
Electrical Characteristics
For typical values, V
CC
= 2.5V to 5.5V; T
A
= +25°C,
bold
values indicate –40°C≤ T
A
≤ +85°C, unless noted.
Symbol
V
CC
I
CC
V
TH
Parameter
Operating Voltage Range
Supply Current
Reset Voltage Threshold
V
CC
= 5.5V, no load.
V
CC
= 3.6V, no load.
Note 7
D2U
t
RST
Reset Timeout Period
D3U
D4U
V
CC
≥ 4.0V, t
SINK
= 3.2mA
V
OL
/RESET Output Voltage
V
CC
≥ 2.5V, t
SINK
= 1.2mA
V
CC
≥ 1.0V, t
SINK
= 50µA
/RESET Output Leakage
/MR Minimum Pulse Width
/MR-to-Reset Delay
V
IH
/MR Input Threshold
V
TH
>
4.0V
V
TH
<
4.0V
V
TH
>
4.0V
V
TH
<
4.0V
10
20
100
2.3
0.7 × V
CC
0.8
0.25 × V
CC
30
V
kΩ
ns
V
/RESET de-asserted
10
0.5
V
TH
−
2.5%
20
140
1100
Condition
Min.
1
5
5
V
TH
28
200
1500
Typ.
Max.
5.5
15
10
V
TH
+ 2.5%
44
320
2500
0.4
0.3
0.3
1
µA
µs
µs
V
ms
Units
V
µA
V
V
IL
/MR Input Threshold
/MR Pull-Up Resistance
/MR Glitch Immunity
Notes:
4. Exceeding the absolute maximum ratings may damage the device.
5. The device is not guaranteed to function outside its operating ratings.
6. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
7. Various reset thresholds available. See
Ordering Information
or contact factory.
October 17, 2014
4
Revision 2.0
Micrel, Inc.
MIC6315
Timing Diagram
Functional Diagram
October 17, 2014
5
Revision 2.0
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