MIC809-5 Datasheet, PDF (1/6 Pages) Micrel Semiconductor – Microprocessor Reset Circuit

MIC809-5
MIC809-5
Microprocessor Reset Circuit
Micrel
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
• 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
Applications
• PDAs, hand-held PCs
• Embedded controllers
• Telecommunications systems
• Power supplies
• Wireless/cellular systems
• Networking hardware
Ordering Information
Part Number
Marking
Typical
Application
Voltage*
Nominal
Threshold
Voltage
MIC809-5SU
IX
3.3V±5%
2.93
MIC809-5SBC3
IX
3.3V±5%
2.93
MIC809-5SUY
IX
3.3V±5%
2.93
MIC809-5SYC3
IX
3.3V±5%
2.93
*Other voltages available. Contact Micrel for details. Minimum order may apply.
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
Typical Application
V_CC
VCC
MIC809-5
/RESET
VCC
µP
/RESET
IttyBitty is a trademark of Micrel, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
July 2005
1
M9999-071305