MIC2775-44BM5 TR Micrel Inc, MIC2775-44BM5 TR Datasheet - Page 6
![IC SUPERVISOR MICROPOWER SOT23-5](/photos/6/57/65771/576-sot-23-5_sml.jpg)
MIC2775-44BM5 TR
Manufacturer Part Number
MIC2775-44BM5 TR
Description
IC SUPERVISOR MICROPOWER SOT23-5
Manufacturer
Micrel Inc
Type
Simple Reset/Power-On Resetr
Datasheet
1.MIC2775-29YM5_TR.pdf
(7 pages)
Specifications of MIC2775-44BM5 TR
Number Of Voltages Monitored
1
Output
Complementary
Reset
Active High/Active Low
Reset Timeout
140 ms Minimum
Voltage - Threshold
4.43V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SOT-23-5, SC-74A, SOT-25
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
MIC2775-44BM5TR
MIC2775-44BM5TR
MIC2775-44BM5TR
Application Information
Ensuring Proper Operation at Low Supply
At levels of V
not turn on sufficiently to produce a valid logic-low on /RST.
In this situation, circuits driven by /RST could be allowed to
float, causing undesired operation. (In most cases, however,
it is expected that the circuits driven by the MIC2775 will be
similarly inoperative at V
If a given application requires that /RST be valid below V
= 1.2V, this can be accomplished by adding a pull-down re-
sistor to the /RST output. A value of 100kΩ is recommended
as this is usually an acceptable compromise of quiescent
current and pull-down current. The resistor’s value is not
critical, however. See Figure 1.
The statements above also apply to the MIC2775’s RST
output. That is, to ensure valid RST signal levels at V
1.2V, a pull-up resistor (as opposed to a pull-down) should
be added to the RST output. A value of 100kΩ is typical for
this application as well. See Figure 2.
MIC2775
V
V
CC
CC
Manual
Reset
Figure 1. MIC2775 Valid /Reset Below 1.2V
Figure 2. MIC2775 Valid Reset Below 1.2V
Manual
Reset
DD
below 1.2V, the MIC2775’s /RST output can-
MIC2775-XX
VDD
/MR
VDD
/MR
MIC2775-XX
/RST
GND
RST
DD
/RST
GND
RST
≤ 1.2V.)
100k
100k
MICROPROCESSOR
MICROPROCESSOR
VCC
/RESET
VCC
/RESET
GND
GND
DD
DD
<
6
Transient response
The MIC2775 is inherently immune to very short negative-
going “glitches.” Very brief transients may exceed the voltage
threshold without tripping the output.
As shown in Figure 3, in general the narrower the transient,
the deeper the threshold overdrive that will be ignored by
the MIC2775. The graph represents the typical allowable
transient duration for a given amount of threshold overdrive
that will not generate a reset.
Figure 3. Typical V
RESET COMP. OVERDRIVE, V
100
80
60
40
20
0
0
Transient Response
500
Typical V
DD
1000
Transient Response
DD
1500
REF
–V
2000
DD
(mV)
June 2009