September 2004
1
MIC841/2
MIC841/2
Micrel
MIC841/842
Comparator with Reference
Typical Application
HTH
OUT
VDD
LTH
GND
MIC841
V
IN
R1
R2
R3
V
OUT
V
DD
V
LTH
> V
HTH
V
REF
= 1.24V
1.5V
V
DD
5.5V
5
3
1
4
2
Threshold Detection with Hysteresis Set by a Third
External Resistor
Features
Optimized for PDAs, cellular telephones, pagers,
and other battery-powered devices
Output can be pulled up to 6V regardless of supply
voltage (841NBC5 only)
High
1.25% voltage threshold accuracy
Built in hysteresis for noise suppression
(MIC842)
Extremely low 1.5
A typical supply current
Immune to brief input transients
TeenyTM 5-lead SC-70 package
Applications
PDAs
Pagers
Cordless phones
Consumer electronics
Embedded controllers
Personal electronics
Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 http://www.micrel.com
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 re-
quires 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 config-
ured either active high or active low; the open-drain output stage
is only configured active high.
Supply current is extremely low (1.5
A, typical), making it ideal
for portable applications.
The MIC841/2 is supplied in Micrel's TeenyTM 5-lead SC-70
package.
Data sheets and support documentation can be found on
Micrel's web site at www.micrel.com.
TeenyTM is a trademark of Micrel, Inc.
INP
OUT
VDD
GND
MIC842
V
IN
R1
R2
V
OUT
V
DD
V
REF
= 1.24V
1.5V
V
DD
5.5V
4
2
1
5
Threshold Detector with Internal Fixed Hysteresis
TeenyTM
MIC841/2
Micrel
MIC841/2
2
September 2004
Ordering Information
Hysteresis
Output
Output
Part Number
Marking
Adjustment
Stage
Function
Temperature Range
Package
MIC841HBC5
B13
External
Push Pull
Active High
40
C to +85
C
SC-70-5
MIC841LBC5
B14
External
Push Pull
Active Low
40
C to +85
C
SC-70-5
MIC841NBC5
B15
External
Open Drain
Active High
40
C to +85
C
SC-70-5
MIC842HBC5
B16
Internal
Push Pull
Active High
40
C to +85
C
SC-70-5
MIC842LBC5
B17
Internal
Push Pull
Active Low
40
C to +85
C
SC-70-5
MIC842NBC5
B18
Internal
Open Drain
Active High
40
C to +85
C
SC-70-5
MIC841HYC5
B13
External
Push Pull
Active High
40
C to +85
C
SC-70-5
Pb-Free
MIC841LYC5
B14
External
Push Pull
Active Low
40
C to +85
C
SC-70-5
Pb-Free
MIC841NYC5
B15
External
Open Drain
Active High
40
C to +85
C
SC-70-5
Pb-Free
MIC842HYC5
B16
Internal
Push Pull
Active High
40
C to +85
C
SC-70-5
Pb-Free
MIC842LYC5
B17
Internal
Push Pull
Active Low
40
C to +85
C
SC-70-5
Pb-Free
MIC842NYC5
B18
Internal
Open Drain
Active High
40
C to +85
C
SC-70-5
Pb-Free
September 2004
3
MIC841/2
MIC841/2
Micrel
Pin Configuration
HTH
VDD
OUT
LTH
1
3
4
5
2
GND
Bxx
MIC841
SC-70-5 (C5)
INP
VDD
OUT
NC
1
3
4
5
2
GND
Bxx
MIC842
SC-70-5 (C5)
Pin Description MIC841
Pin Number
Pin Name
Pin Function
1
HTH
High-Voltage Threshold (Input): Analog input to a comparator. This is the
voltage input assigned to detect a high-voltage condition. When the level on
this pin exceeds V
REF
, OUT is asserted and the condition is latched until
V
LTH
< V
REF
.
2
GND
Ground.
3
LTH
Low-Voltage Threshold (Input): Analog input to a comparator. This is the
voltage input assigned to detect a low voltage condition. When the level on
this pin falls below V
REF
, OUT is de-asserted and the condition is latched
until V
HTH
> V
REF
.
4
OUT ("N" Version)
Output: Active-high, open-drain output. This output is de-asserted and
latched when V
LTH
<V
REF
, indicating a low voltage condition. This state
remains latched until V
HTH
> V
REF
.
OUT ("H" Version)
Output: Push-pull output. This output is de-asserted and latched when V
LTH
< V
REF
, indicating a low voltage condition. This state remains latched until
V
HTH
> V
REF
.
OUT ("L" Version)
Output: Push-pull output. This output is asserted and latched when
V
LTH
< V
REF
, indicating a low voltage condition. This state remains latched
until V
HTH
> V
REF
.
5
V
DD
Power Supply (Input): Independent supply input for internal circuitry.
Pin Description MIC842
Pin Number
Pin Name
Pin Function
1
INP
Input: Analog input to the comparator. When V
INP
> V
REF
+ V
HYST
, V
OUT
is
asserted, and the condition is held until V
INP
< V
REF
.
2
GND
Ground.
3
NC
No Connect.
4
OUT ("N" Version)
Output: Active-high, open-drain output. This output is de-asserted when
V
INP
< V
REF
, indicating a low voltage input. The output is asserted when
V
INP
> V
REF
+ V
HYST
.
OUT ("H" Version)
Output: Push-pull output. This output is de-asserted and latched when
V
INP
< V
REF
, indicating a low voltage condition. This state remains latched
until V
INP
> V
REF
+ V
HYST
.
OUT ("L" Version)
Output: Push-pull output. This output is asserted and latched when
V
INP
< V
REF
, indicating a low voltage condition. This state remains latched
until V
INP
> V
REF
+ V
HYST
.
5
V
DD
Power Supply (Input): Independent supply input for internal circuitry.
MIC841/2
Micrel
MIC841/2
4
September 2004
Absolute Maximum Ratings
(1)
Supply Voltage (V
DD
) ..................................... 0.3V to +7V
Input Voltage (V
INP
) ...................................................... +7V
Output Current (I
OUT
) ................................................. 20mA
Storage Temperature (T
S
) ....................... 65
C to +150
C
ESD Rating, Note 3 ...................................................... 1kV
Operating Ratings
(2)
Supply Voltage (V
DD
) .................................. +1.5V to +5.5V
Input Voltage (V
INP
) ......................................... 0.3V to 6V
Ambient Temperature Range (T
A
) ............. 40
C to +85
C
Junction Temperature (T
J
) ....................... Internally Limited
Package Thermal Resistance (
JA
) ...................... 450
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
Parameter
Condition
Min
Typ
Max
Units
I
DD
Supply Current
output not asserted
1.5
3
A
I
INP
Input Leakage Current
0.005
10
nA
V
REF
Reference Voltage
0
C to 85
C
1.225
1.240
1.256
V
40
C to 85
C
1.219
1.240
1.261
V
V
HYST
Hysteresis Voltage, (Note 5)
MIC842 only
8
20
35
mV
t
D
Propagation Delay
V
INP
= 1.352V to 1.128V
12
s
V
INP
= 1.143V to 1.367V
8
s
V
OUT
Output Voltage-Low
I
SINK
= 1.6mA, V
DD
1.6V
0.05
0.3
V
(Note 6)
I
SINK
= 100
A, V
DD
1.2V
0.005
0.4
V
Output Voltage-High
I
SOURCE
= 500
A, V
DD
1.6V
0.99V
DD
V
I
SOURCE
= 50
A, V
DD
1.2V
0.99V
DD
V
Notes:
1.
Exceeding the absolute maximum rating may damage the device.
2.
The device is not guaranteed to function outside its operating rating.
3.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
4.
Specification for packaged product only.
5.
V
HTH
= V
REF
+ V
HYST
.
6.
V
DD
operating range is 1.5V to 5.5V. Output is guaranteed to be de-asserted down to V
DD
= 1.2V.
September 2004
5
MIC841/2
MIC841/2
Micrel
Block Diagrams
GND
V
DD
OUT
1.24V
Bandgap
Reference
Low-Voltage
Detect
High-Voltage
Detect
R
S
Q
Q
LTH
HTH
V
LTH
V
HTH
MIC841H
V
DD
V
IN
3
1
2
4
5
GND
V
DD
OUT
1.24V
Bandgap
Reference
Low-Voltage
Detect
High-Voltage
Detect
R
S
Q
Q
LTH
HTH
V
LTH
V
HTH
MIC841L
V
DD
V
IN
3
1
2
4
5
GND
V
DD
OUT
1.24V
Bandgap
Reference
Low-Voltage
Detect
High-Voltage
Detect
R
S
Q
Q
LTH
HTH
V
LTH
V
HTH
MIC841N
V
DD
V
IN
3
1
2
4
5
GND
V
IN
1.24V
Bandgap
Reference
High-Voltage
Detect
INP
V
TH
MIC842H
2
1
5
V
DD
V
DD
OUT
4
GND
V
IN
1.24V
Bandgap
Reference
High-Voltage
Detect
INP
V
TH
MIC842L
2
1
5
V
DD
V
DD
OUT
4
GND
V
IN
OUT
1.24V
Bandgap
Reference
High-Voltage
Detect
INP
V
TH
MIC842N
4
2
1
5
V
DD
V
DD
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