MIC1815-20U TR Micrel Inc, MIC1815-20U TR Datasheet - Page 5

• Manufacturer Part Number: MIC1815-20U TR
• Description: IC RESET CIRCUIT 2.55V SOT23-3
• Manufacturer: Micrel Inc
• Type: Simple Reset/Power-On Resetr

Specifications of MIC1815-20U TR

• Number Of Voltages Monitored: 1
• Reset: Active Low
• Reset Timeout: 100 ms Minimum
• Voltage - Threshold: 2.55V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-3, TO-236-3, Micro3™, SSD3, SST3
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Output: -
• Other names: MIC1815-20UTR; MIC1815-20UTR

Applications Information
Microprocessor Reset
The /RESET pin is asserted whenever V
reset threshold voltage. The reset pin remains asserted for a
period of t
voltage. The reset function ensures the microprocessor is
properly reset and powers up into a known condition after
a power failure. /RESET will remain valid with V
as 1V.
V
The MIC1815 is relatively immune to negative-going V
glitches below the reset threshold. Typically, a negative-going
transient 125mV below the reset threshold with a duration of
20µs or less will not cause an unwanted reset.
July 2005
MIC1815
CC
Transients
RST
after V
CC
has risen above the reset threshold
CC
falls below the
CC
as low
CC
5
/RESET Valid at Low Voltage
A resistor can be added from the /RESET pin-to-ground to
ensure the /RESET output remains low with V
0V. A 100kΩ resistor connected from /RESET-to-ground is
recommended. The resistor should be large enough not to
load the /RESET output and small enough to pull-down any
stray leakage currents. See Figure below.
MIC1815
V CC
RESET
/RESET Valid to V
V CC
100K
CC
RESET
= 0V
V CC
µP
CC
MIC1815
down to
Micrel