MIC809-5
Micrel
MIC809-5
Microprocessor Reset Circuit
General Description
The MIC809-5 is a power supply supervisor that provides
under-voltage monitoring and power-on reset generation in
an industry standard 3-pin SOT package and SC-70 pack-
age. The reset output is asserted at power-on and any time
the input voltage drops below the programmed threshold. It
remains asserted for 30ms (min.) after the input subsequently
rises back above the threshold boundary. The MIC809-5 has
an active-low reset output.
The MIC809-5 is inherently immune to brief power supply
transients. Typical supply current is a low 5µA. For those
applications that require a manual reset function, see the
MIC811/812. For those applications that require a longer
reset timeout, see the MIC809/810. (The MIC809-5 is identi-
cal to the industry-standard MIC809 with the exception of a
shorter reset timeout).
Features
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Under-voltage monitor
Power-on reset generation (30ms minimum)
Choice of threshold voltages
Active-low reset output
No external components required
Rejects brief input transients
Industry standard package and pinout
3-pin IttyBitty™ SOT23-3 package and SC-70 package
PDAs, hand-held PCs
Embedded controllers
Telecommunications systems
Power supplies
Wireless/cellular systems
Networking hardware
Applications
Ordering Information
Part Number
MIC809-5SU
MIC809-5SBC3
MIC809-5SUY
MIC809-5SYC3
Marking
IX
IX
IX
IX
Typical
Application
Voltage*
3.3V±5%
3.3V±5%
3.3V±5%
3.3V±5%
Nominal
Threshold
Voltage
2.93
2.93
2.93
2.93
t
RST
(ms)
30
30
30
30
Operating
Temp. Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package
SOT23-3
SC70-3
SOT23-3
SC70-3
Pb-Free
No
No
Yes
Yes
*Other voltages available. Contact Micrel for details. Minimum order may apply.
Typical Application
V
CC
VCC
VCC
µP
MIC809-5
/RESET
/RESET
IttyBitty is a trademark of Micrel, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
July 2005
1
M9999-071305
MICREL [ MICREL SEMICONDUCTOR ]
