CM3403
Micropower Supply Voltage Supervisor (SVS)
Features
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Precision voltage sensor
Two threshold options: 2.93V or 4.63V
Stable over temperature
Valid output logic while V
CC
= 0V.
Power-on reset pulse width of
140ms (min.) to 460ms (max.)
Low quiescent current (40µA typ.)
No external components required
3-pin SOT23 package
"809" compatible pinout
Lead-free versions available
Product Description
The CM3403 is a micropower low voltage supply
supervisor designed to provide the necessary power-
on reset control for microprocessors and memory
applications. An internal pull-down resistor on the
RESET output ensures the output remains valid under
all supply conditions.
During either a cold-start power-up or a complete
power-down sequence, the RESET output will remain
at 0V while the V
CC
input voltage is between the
threshold level and ground.
When the V
CC
input exceeds the preset threshold volt-
age, an internal timer is triggered and the RESET out-
put remains active for a minimum of 140ms, at which
point the output is taken inactive.
In the event of a "brown-out" condition and the V
CC
voltage collapses below the threshold the RESET out-
put is immediately asserted.
Both the trigger threshold and the precision delay pulse
are internally controlled eliminating the requirement for
external components.
The CM3403 is housed in a 3-pin SOT23 package and
is available with optional lead-free finishing.
Applications
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Critical µP and µC power monitoring
PCI applications
Memory integrity during "brownouts"
Typical Application Circuit
Simplified Electrical Schematic
V
IN
CM3403
V
CC
Microprocessor
V
CC
+
-
RESET
GND
RESET
GND
GND
Rising Edge
Delay
RESET
R
PULLDOWN
V
CC
Threshold
Reference
©
2004 California Micro Devices Corp. All rights reserved.
10/29/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
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Tel: 408.263.3214
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Fax: 408.263.7846
●
www.calmicro.com
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CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
