MIC841NBC5 Micrel Inc, MIC841NBC5 Datasheet

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MIC841NBC5

Manufacturer Part Number
MIC841NBC5
Description
Manufacturer
Micrel Inc
Datasheet

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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 Teeny™ 5-lead SC-70
package.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Typical Application
Teeny™ is a trademark of Micrel, Inc.
September 2004
MIC841/2
Threshold Detection with Hysteresis Set by a Third
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
R1
R2
R3
V
IN
V
DD
External Resistor
5
3
1
VDD
LTH
HTH
MIC841
GND
OUT
4
2
V
V
V
1.5V
OUT
LTH
REF
> V
= 1.24V
V
HTH
DD
5.5V
1
Features
• Optimized for PDAs, cellular telephones, pagers,
• Output can be pulled up to 6V regardless of supply
• High 1.25% voltage threshold accuracy
• Built in hysteresis for noise suppression
• Extremely low 1.5 A typical supply current
• Immune to brief input transients
• Teeny™ 5-lead SC-70 package
Applications
• PDAs
• Pagers
• Cordless phones
• Consumer electronics
• Embedded controllers
• Personal electronics
and other battery-powered devices
voltage (841NBC5 only)
(MIC842)
Threshold Detector with Internal Fixed Hysteresis
Comparator with Reference
R1
R2
V
IN
V
MIC841/842
DD
5
1
VDD
INP
MIC842
GND
OUT
4
2
V
V
1.5V
OUT
REF
= 1.24V
Teeny™
V
DD
MIC841/2
5.5V
Micrel

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MIC841NBC5 Summary of contents

Page 1

MIC841/2 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, ...

Page 2

... MIC841/2 Ordering Information Hysteresis Part Number Marking Adjustment MIC841HBC5 B13 MIC841LBC5 B14 MIC841NBC5 B15 MIC842HBC5 B16 MIC842LBC5 B17 MIC842NBC5 B18 MIC841HYC5 B13 MIC841LYC5 B14 MIC841NYC5 B15 MIC842HYC5 B16 MIC842LYC5 B17 MIC842NYC5 B18 MIC841/2 Output Output Stage Function External Push Pull Active High ...

Page 3

MIC841/2 Pin Configuration LTH GND HTH Bxx 4 5 OUT VDD MIC841 SC-70-5 (C5) Pin Description MIC841 Pin Number Pin Name 1 HTH 2 GND 3 LTH 4 OUT (“N” Version) OUT (“H” Version) OUT (“L” Version) ...

Page 4

MIC841/2 Absolute Maximum Ratings Supply Voltage (V ) ..................................... –0.3V to +7V DD Input Voltage (V ) ...................................................... +7V INP Output Current (I ) ................................................. 20mA OUT Storage Temperature (T ) ....................... – +150 C S ESD Rating, ...

Page 5

MIC841/2 Block Diagrams Low-Voltage Detect LTH V LTH 3 High-Voltage HTH Detect V HTH 1 1.24V Bandgap Reference 2 GND Low-Voltage Detect LTH V LTH 3 ...

Page 6

MIC841/2 Applications Information Output The MIC841N and MIC842N outputs are an open-drain MOSFET, so most applications will require a pull-up resistor. The value of the resistor should not be too large or leakage effects may dominate. 470k is the maximum ...

Page 7

MIC841/2 Input Transients The MIC841/2 is inherently immune to very short negative- going “glitches.” Very brief transients may exceed the V threshold without tripping the output. As shown in Figure 3, the narrower the transient, the deeper the threshold overdrive ...

Page 8

MIC841/2 Package Information 0.65 (0.0256) BSC 2.20 (0.087) 1.80 (0.071) 0.30 (0.012) 0.15 (0.006) MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL The information furnished by Micrel in this datasheet is believed to ...

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