CM3403 Просмотр технического описания (PDF) - California Micro Devices Corp
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CM3403 Datasheet PDF : 6 Pages
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Micropower Supply Voltage Supervisor (SVS)
CM3403
Features
• Precision voltage sensor
• Two threshold options: 2.93V or 4.63V
• Stable over temperature
• Valid output logic while VCC = 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
Applications
• Critical µP and µC power monitoring
• PCI applications
• Memory integrity during "brownouts"
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 VCC input voltage is between the
threshold level and ground.
When the VCC 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 VCC
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.
Typical Application Circuit
Simplified Electrical Schematic
VIN
CM3403
Microprocessor
VCC
+
VCC RESET
RESET VCC
-
Threshold
Reference
GND
GND
GND
Rising Edge
Delay
RESET
RPULLDOWN
© 2004 California Micro Devices Corp. All rights reserved.
10/29/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com 1
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