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CM3400-00SN Datasheet(PDF) 1 Page - California Micro Devices Corp |
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CM3400-00SN Datasheet(HTML) 1 Page - California Micro Devices Corp |
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1 / 9 page  © 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 1 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 (40 µA 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. Simplified Electrical Schematic Typical Application Circuit SENSE MR RESET GND + - CT CT R1 GND CM3400 RESET VDD uP or Memory Control R2 SENSE VTH + GND - Falling Edge Delay RESET 200K tDELAY CT 100K RESET MR VDD EN 1 µA |
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