MIC841/842
Comparator with 1.25% Reference
and Adjustable Hysteresis
General Description
The MIC841 and MIC842 are micropower, precision
voltage comparators with an on-chip voltage reference.
Both devices are intended for voltage monitoring
applications. External resistors are used to set the voltage
monitor threshold. When the threshold is crossed,
the outputs switch polarity.
The MIC842 incorporates a voltage reference and
comparator with fixed internal hysteresis; two external
resistors are used to set the switching threshold voltage.
The MIC841 provides a similar function with user
adjustable hysteresis; this part requires three external
resistors to set the upper and lower thresholds
(the difference between the threshold voltages being the
hysteresis voltage).
Both the MIC841 and MIC842 are available with push-pull
or open-drain output stage. The push-pull output stage is
configured either active high or active low; the open-drain
output stage is only configured active low.
Supply current is extremely low (1.5μA, typical), making it
ideal for portable applications.
The MIC841/2 is supplied in Micrel’s Teeny™ 5-pin
SC-70 package.
Data sheets and support documentation are found on the
Micrel web site:
www.micrel.com.
Features
•
•
•
•
•
•
•
•
1.5V to 5.5V operating range
1.5μA typical supply current
±1.25% voltage threshold accuracy
10nA max input leakage current over temperature
10µs propagation delay
Externally adjustable hysteresis (MIC841)
Internal 20mV hysteresis (MIC842)
Output options
- Push-pull, active high
- Push-pull, active low
- Open drain, active low
•
Open drain output can be pulled to 6V regardless of V
DD
•
Immune to brief input transients
•
Teeny™ 5-pin SC-70 package
Applications
•
•
•
•
Smart phones
PDAs
Precision battery monitoring
Battery chargers
______________________________________________________________________________________________________________________
Typical Application
Threshold Detection with
Adjustable Hysteresis
Teeny™ is a trademark of Micrel, Inc.
Threshold Detector with
Internal Fixed Hysteresis
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
April 2011
M9999-042711-C
Micrel, Inc.
MIC841/2
Pin Configuration
MIC841
SC-70-5 (C5)
MIC842
SC-70-5 (C5)
Pin Description MIC841
Pin Number
1
2
3
Pin Name
HTH
GND
LTH
OUT
4
OUT
OUT
5
V
DD
Pin Function
High Threshold Input. HTH and LTH monitor external voltages.
Ground.
Low Threshold Input. LTH and HTH monitor external voltages.
(“H” Version) Active-Low Push-Pull Output. OUT asserts low when V
LTH
<
V
REF
. OUT remains low until V
HTH
> V
REF
.
(“L” Version) Active-High Push-Pull output. OUT asserts high when V
LTL
<
V
REF
. OUT remains high until V
HTH
> V
REF
.
(“N” Version) Active-Low, Open-Drain Output. OUT asserts low when V
LTH
<
V
REF
. OUT remains low until V
HTH
> V
REF
.
Power Supply Input
Pin Description MIC842
Pin Number
1
2
3
Pin Name
INP
GND
NC
OUT
4
OUT
OUT
5
V
DD
Pin Function
Threshold Input. INP monitors an external voltage.
Ground
No Connect. Not internally connected.
(“H” Version) Active-Low, Push-Pull Output. OUT asserts low when V
INP
<
V
REF
. OUT remains low until V
INP
> (V
REF
+ V
HYST
).
(“L” Version) Active-High, Push-Pull Output. OUT asserts high when V
INP
<
V
REF
. OUT remains high until V
INP
> (V
REF
+ V
HYST
).
(“N” Version) Active-Low, Open-Drain Output. OUT asserts low when V
INP
<
V
REF
. OUT remains low until V
INP
> (V
REF
+ V
HYST
).
Power Supply Input
April 2011
3
M9999-042711-C
Micrel, Inc.
MIC841/2
Absolute Maximum Ratings
(1)
Supply Voltage (V
DD
)....................................... –0.3V to +7V
Input Voltage (V
INP,
V
LTH,
V
LTL
) .......................................+7V
Output Current (I
OUT
) .................................................±20mA
Storage Temperature (T
S
)........................ –65°C to +150°C
Junction Temperature (T
J
) ........................................ 150°C
ESD Rating,
Note 3
....................................................... 1kV
Operating Ratings
(2)
Supply Voltage (V
DD
)................................... +1.5V to +5.5V
Input Voltage (V
INP
V
LTH,
V
LTL
)........................... –0.3V to 6V
V
OUT
(‘H’ and ‘L’ versions)............................................... V
DD
V
OUT
(‘N’ version) ............................................................. 6V
Ambient Temperature Range (T
A
) ............. –40°C to +85°C
Package Thermal Resistance (θ
JA
).................... 256.5°C/W
Electrical Characteristics
(4)
1.5V
≤
V
DD
≤
5.5V; T
A
= +25°C,
bold
values indicate –40°C≤ T
A
≤
+85°C, unless noted.
Symbol
I
DD
I
INP
V
REF
V
HYST
t
D
Parameter
Supply Current
Input Leakage Current
Reference Voltage
Hysteresis Voltage,
(Note 5)
Propagation Delay
0°C to 85°C
–40°C to 85°C
MIC842 only
V
INP
= 1.352V to 1.128V
V
INP
= 1.143V to 1.367V
I
SINK
= 1.6mA, V
DD
≥
1.6V
I
SINK
= 100μA, V
DD
≥
1.2V
I
SOURCE
= 500μA, V
DD
≥
1.6V
I
SOURCE
= 50μA, V
DD
≥
1.2V
1.225
1.219
8
Condition
Output not asserted
Min
Typ
1.5
0.005
1.240
1.240
20
12
8
0.05
0.005
0.99V
DD
0.99V
DD
0.3
0.4
Max
3
10
1.256
1.261
35
Units
μA
nA
V
V
mV
μs
μs
V
V
V
V
Output Voltage-Low
V
OUT
(Note 6)
Output Voltage-High
Notes:
1.
2.
3.
4.
5.
6.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Specification for packaged product only.
V
HTH
= V
REF
+ V
HYST
.
V
DD
operating range is 1.5V to 5.5V. Output is guaranteed to be de-asserted down to V
DD
= 1.2V.
April 2011
4
M9999-042711-C
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