MIC826
Voltage Supervisor with Watchdog Timer,
Manual Reset, and Dual Outputs
In 1.6mm x 1.6mm TDFN
General Description
The MIC826 is a low-current, ultra-small, voltage
supervisor with manual reset input, watchdog timer, and
active-high and active-low push-pull outputs. The reset
outputs are asserted and held when the supply voltage
falls below the factory-programmed threshold voltage,
when the /MR pin is pulled low, or if the watchdog times
out. Reset is asserted for the reset timeout delay after the
supply voltage increases above the rising threshold
voltage or when manual reset input is asserted high.
The MIC826 features an integrated pull-up resistor on the
/MR. An active-low push-pull reset output (/RESET) and
an active-high reset output (RESET) provide flexibility
when interfacing with various microcontrollers, PMICs, or
load switches. The watchdog input can be left
unconnected for applications that do not require watchdog
monitoring.
The MIC826 consumes a quiescent current of only 3.8µA
and is offered in a tiny, space-saving, 6-pin 1.6mm x
1.6mm Thin DFN package. It is rated for the –40°C to
+125°C temperature range.
Datasheets and support documentation are available on
Micrel’s web site at:
www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Precision 1.8V to 5V power supply monitor
±0.5% threshold accuracy at T
A
= +25°C
±1.5% threshold accuracy from T
A
= –40°C to +125°C
3.8µA supply current (MIC826S/R/T/W/Y/Z)
4.8µA supply current (MIC826L/M)
Manual reset input
140ms (min.) reset timeout period
1.6s (typ.) watchdog timeout period
Float watchdog timer input to disable watchdog timer
Active-high and active-low push-pull outputs
Guaranteed reset output valid to VCC = 1V
−40°C
to +125°C junction temperature range
6-pin 1.6mm x 1.6mm x 0.5mm Thin DFN package
50% smaller version of
MAX823/MAX824/MAX825/ADM823/ADM824/ADM825
•
8x lower watchdog input current than competition
Applications
•
Microprocessor systems
•
Computers
•
Intelligent instruments
_________________________________________________________________________________________________________________________
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
February 4, 2013
Revision 1.0
Micrel, Inc.
MIC826
Ordering Information
Part Number
MIC826LYMT
MIC826MYMT
MIC826TYMT
MIC826SYMT
MIC826RYMT
MIC826ZYMT
MIC826YYMT
MIC826WYMT
Top
Marking
82L
82M
82T
82S
82R
82Z
82Y
82W
V
RST
: Nominal
Threshold
Voltage (V)
4.625
4.375
3.075
2.925
2.625
2.315
2.188
1.665
Package
6-Pin 1.6mm
×
1.6mm TDFN
6-Pin 1.6mm
×
1.6mm TDFN
6-Pin 1.6mm
×
1.6mm TDFN
6-Pin 1.6mm
×
1.6mm TDFN
6-Pin 1.6mm
×
1.6mm TDFN
6-Pin 1.6mm
×
1.6mm TDFN
6-Pin 1.6mm
×
1.6mm TDFN
6-Pin 1.6mm
×
1.6mm TDFN
Junction Temperature
Range
−40°C
to +125°C
−40°C
to +125°C
−40°C
to +125°C
−40°C
to +125°C
−40°C
to +125°C
−40°C
to +125°C
−40°C
to +125°C
−40°C
to +125°C
Lead
Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pin Configuration
6-Pin 1.6mm
×
1.6mm TDFN
(Top View)
Pin Description
Pin
Number
1
2
3
Pin Name
/RESET
GND
RESET
Pin Function
Active-Low Reset Output. Pulses low for 200ms when triggered, and remains low whenever VCC is below
the reset threshold or when /MR is a logic low. It remains low for 200ms after one of the following occurs:
VCC rises above the reset threshold, the watchdog triggers a reset, or /MR goes low to high.
Supply Ground.
Active-High Reset Output. Pulses high for 200ms when triggered, and remains high whenever VCC is
below the reset threshold or when /MR is a logic low. It remains high for 200ms after one of the following
occurs: VCC rises above the reset threshold, the watchdog triggers a reset, or /MR goes low to high.
RESET is the inverse of /RESET.
Watchdog Input. If WDI remains either high or low for longer than the watchdog timeout period, the internal
watchdog timer runs out and a reset is triggered. The internal watchdog timer clears whenever reset is
asserted, or whenever WDI sees a rising or falling edge. If WDI is left unconnected or is connected to a
three-stated buffer output, the watchdog feature is disabled.
Manual Reset Input. A logic low on /MR asserts reset. Reset remains asserted as long as /MR is held low
and for 200ms after /MR returns high. The active-low input has an internal 52kΩ pull-up resistor. It can be
driven from a CMOS logic line or shorted to ground with a switch. Leave open or connect to VCC if
unused.
Supply Voltage Pin. VCC is the input to the supply voltage monitor. When the supply voltage falls below
the reset threshold voltage, reset outputs (/RESET and RESET) are triggered immediately. When the
supply voltage rises above the reset threshold plus hysteresis voltage, the reset outputs remain asserted
for the duration of the reset timeout period. A decoupling ceramic capacitor (minimum 0.1μF) must be
connected between VCC and GND close to the pins.
Exposed Pad. Connect to GND.
4
WDI
5
/MR
6
VCC
EP
ePad
February 4, 2013
2
Revision 1.0
Micrel, Inc.
MIC826
Absolute Maximum Ratings
(1)
Supply Voltage (VCC) ..................................
−0.3V
to
+6.0V
/MR, WDI, RESET, /RESET................
−0.3V
to VCC + 0.3V
Input Current, All Pins except (RESET, /RESET) ....... 20mA
Output Current (RESET, /RESET) .............................. 20mA
Junction Temperature (T
J
) ........................
−40°C
to +150°C
Storage Temperature (Ts).........................
−65°C
to
+150°C
(3)
ESD Rating (Human Body Model) ........................... 1.5kV
(3)
ESD Rating (Machine Model) .................................... 200V
Operating Ratings
(2)
Supply Voltage (VCC) ..................................... +1V to +5.5V
Watchdog Input (WDI) ..................................... 0V to +VCC
Junction Temperature (T
J
) ........................
−40°C
to +125°C
Junction Thermal Resistance
1.6mm
×
1.6mm TDFN (θ
JA
) ........................... 92.4°C/W
1.6mm
×
1.6mm TDFN (θ
JC
)........................... 56.4°C/W
Electrical Characteristics
(4)
VCC = 4.7V to 5.5V for MIC826L, VCC = 4.5V to 5.5V for MIC826M, VCC = 3.15V to 3.6V for MIC826T, VCC = 3.0V to 3.6V for
MIC826S, VCC = 2.7V to 3.6V for MIC826R, VCC = 2.38V to 2.75V for MIC826Z, VCC = 2.25V to 2.75V for MIC826Y, VCC = 1.75V to
(5)
2.0V for MIC826W; T
J
= +25˚C,
bold
values indicate –40˚C ≤ T
J
≤ +125˚C, unless otherwise noted.
Parameter
Power Supply Input
Supply Voltage (VCC)
MIC826L/M (WDI and /MR unconnected)
Supply Current (I
VCC
)
Reset Threshold Voltage
L (falling) T
A
= 25°C
L (falling)
−40°C ≤
T
A
≤
+125°C
M (falling) T
A
= 25°C
M (falling) –40°C
≤
T
A
≤
+125°C
T (falling) T
A
= 25°C
T (falling) –40°C
≤
T
A
≤
+125°C
S (falling) T
A
= 25°C
Reset Threshold Voltage (V
RST
)
S (falling) –40°C
≤
T
A
≤
+125°C
R (falling) T
A
= 25°C
R (falling) –40°C
≤
T
A
≤
+125°C
Z (falling) T
A
= 25°C
Z (falling) –40°C
≤
T
A
≤
+125°C
Y (falling) T
A
= 25°C
Y (falling) –40°C
≤
T
A
≤
+125°C
W (falling) T
A
= 25°C
W (falling) –40°C
≤
T
A
≤
+125°C
Reset Threshold Hysteresis
Reset Threshold Tempco
L, M
T, S, R, Z, Y, W
4.602
4.556
4.353
4.309
3.060
3.029
2.910
2.881
2.612
2.586
2.303
2.280
2.177
2.155
1.657
1.640
10
5
40
1.665
2.188
2.315
2.625
2.925
3.075
4.375
4.625
4.648
4.694
4.397
4.441
3.090
3.121
2.940
2.969
2.638
2.664
2.327
2.350
2.199
2.221
1.673
1.690
mV
mV
ppm/˚C
V
MIC826T/S/R/Z/Y/W (WDI and /MR
unconnected)
1.0
4.8
3.8
5.5
14
µA
8.4
V
Conditions
Min.
Typ.
Max.
Units
February 4, 2013
3
Revision 1.0
Micrel, Inc.
MIC826
Electrical Characteristics
(4)
(Continued)
VCC = 4.7V to 5.5V for MIC826L, VCC = 4.5V to 5.5V for MIC826M, VCC = 3.15V to 3.6V for MIC826T, VCC = 3.0V to 3.6V for
MIC826S, VCC = 2.7V to 3.6V for MIC826R, VCC = 2.38V to 2.75V for MIC826Z, VCC = 2.25V to 2.75V for MIC826Y, V
CC
= 1.75V to
(5)
2.0V for MIC826W; T
A
= +25˚C,
bold
values indicate –40˚C ≤ T
A
≤ +125˚C, unless otherwise noted.
Parameter
Reset Timeout Period (t
RP
)
Reset Time
VCC to /RESET Delay (t
RD
)
Reset Outputs (/RESET, RESET)
L, M: VCC
=
V
RST (MAX)
, I
SOURCE
= 120µA
/RESET Output Voltage High (V
OH
)
T, S, R, Z, Y: VCC
=
V
RST (MAX)
,
I
SOURCE
= 30µA
W: VCC
=
V
RST (MAX)
, I
SOURCE
= 20µA
L, M: VCC
=
V
RST (MIN)
, I
SINK
= 3.2mA
/RESET Output Voltage Low (V
OL
)
T, S, R, Z, Y, W: VCC
=
V
RST (MIN)
,
I
SINK
= 1.2mA
T
A
= 0˚C to +70˚C, VCC = 1V, I
SINK
=50µA
VCC = 1.2V, I
SINK
=100µA
L, M: /RESET = 0V, VCC = 5.5V
/RESET Output Short-Circuit Current
RESET Output Voltage High (V
OH
)
RESET Output Voltage Low (V
OL
)
Watchdog Input (WDI)
(7)
(6)
Conditions
Min.
140
Typ.
200
Max.
280
Units
ms
10
µs
VCC – 1.5
0.8 × VCC
0.8 × VCC
0.4
0.3
0.3
0.3
800
400
0.8 × VCC
0.4
0.3
V
µA
V
V
V
T, S, R, Z, Y, W: /RESET = 0V,
VCC = 3.6V
VCC
>
1.6V, I
SOURCE
= 150µA
L, M: VCC
=
V
RST (MAX)
, I
SINK
= 3.2mA
T, S, R, Z, Y, W: VCC
=
V
RST (MAX)
,
I
SINK
= 1.2mA
Watchdog Timeout Period (t
WD
)
Watchdog Pulse Width
Watchdog Input Low Voltage (V
IL
)
Watchdog Input High Voltage (V
IH
)
Watchdog Input Current
WDI = VCC
WDI = 0V
1.12
50
1.60
2.40
s
ns
0.3
×
VCC
0.7
×
VCC
15
–20
–15
25
V
µA
February 4, 2013
4
Revision 1.0
Micrel, Inc.
MIC826
Electrical Characteristics
(4)
(Continued)
VCC = 4.7V to 5.5V for MIC826L, VCC = 4.5V to 5.5V for MIC826M, VCC = 3.15V to 3.6V for MIC826T, VCC = 3.0V to 3.6V for
MIC826S, VCC = 2.7V to 3.6V for MIC826R, VCC = 2.38V to 2.75V for MIC826Z, VCC = 2.25V to 2.75V for MIC826Y, V
CC
= 1.75V to
(5)
2.0V for MIC826W; T
A
= +25˚C,
bold
values indicate –40˚C ≤ T
A
≤ +125˚C, unless otherwise noted.
Parameter
Manual Reset Input (/MR)
Input Low Voltage (V
IL
)
Input High Voltage (V
IH
)
/MR Pulse Width
/MR Noise Immunity (pulse width with no
reset)
/MR to RESET Delay
/MR Internal Pull-Up Resistor
Notes:
1.
2.
3.
4.
5.
6.
7.
Exceeding the absolute maximum ratings may damage the device.
The device is not guaranteed to function outside its operating ratings.
Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
Specifications are for packaged product only.
Overtemperature limits are guaranteed by design and not product tested.
The /RESET short-circuit current is the maximum pull-up current when /RESET is driven low by µP bidirectional reset pin.
The WDI input is designed to drive a three-state output device with a 10µA maximum leakage current and a maximum capacitance of 200pF.
Conditions
Min.
Typ.
Max.
Units
0.3 ×
VCC
0.7 × VCC
1.0
100
500
35
52
75
V
V
µs
ns
ns
kΩ
February 4, 2013
5
Revision 1.0
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