171CMD Ver la hoja de datos (PDF) - California Micro Devices Corp
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171CMD Datasheet PDF : 9 Pages
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CM3400
Micropower, Universal Supply Voltage Supervisor (SVS)
Features
• Temperature stable 1.0V trigger reference
• User adjustable reset threshold
• User adjustable reset delay time > 25msec
• Complimentary outputs (RESET, RESET)
• Integrated pull-up/down resistors
• Manual reset (MR) control input
• Low operating current (40µA typ.)
• 8-lead MSOP and SOIC package
Applications
• Critical power monitoring
• Power-up sequencing
• Memory integrity during "brownouts"
Product Description
The CM3400 is a universal supply voltage supervisory
(SVS) controller for critical power monitoring and power
sequencing applications. During an initial power-up,
both complimentary outputs (RESET, RESET) remain
active. Once the supply voltage being monitored
exceeds the user programmed reset threshold, the out-
puts will remain active for an additional timeout interval
which is also user controlled. Both outputs become
inactive once the delay interval has expired.
The user controlled reset threshold is determined by
two external resistors as follows:
Reset Threshold [V] = (R1 + R2) / R2
The delay time is set by an external capacitor CT, as
follows (where CT is in [nF]):
Reset Delay [ms] = (375 x CT[nF]) + 25 [ms]
During a brown-out condition, both outputs will immedi-
ately become active and remain active until the supply
being monitored has been restored for a period
exceeding the delay pulse. During a complete power-
down situation, both outputs will continually "hug" their
respective rails. This is achieved by the use of inte-
grated pull-up/down resistors.
The CM3400 is available in a low profile MSOP-8 and a
SOIC-8 package.
Typical Application Circuit
Simplified Electrical Schematic
R1
+
R2
-
VDD
CM3400
VDD
SENSE
RESET
MR
RESET
CT
GND
MR
uP or
Memory
Control
VTH
SENSE
CT
CT
GND
GND
1µA
+
EN
-
Falling Edge Delay
tDELAY
100K
RESET
RESET
200K
© 2003 California Micro Devices Corp. All rights reserved.
10/06/03 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 L Tel: 408.263.3214 L Fax: 408.263.7846 L www.calmicro.com
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