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CM3400 Datasheet(PDF) 2 Page - California Micro Devices Corp

Part # CM3400
Description  Micropower, Universal Supply Voltage Supervisor (SVS)
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Manufacturer  CALMIRCO [California Micro Devices Corp]
Direct Link  http://www.calmicro.com
Logo CALMIRCO - California Micro Devices Corp

CM3400 Datasheet(HTML) 2 Page - California Micro Devices Corp

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© 2003 California Micro Devices Corp. All rights reserved.
2
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
L Tel: 408.263.3214
L Fax: 408.263.7846 L www.calmicro.com
10/06/03
CM3400
PIN DESCRIPTIONS
PIN(S)
NAME
DESCRIPTION
1
N.C.
No connect.
2MR
Active-Low manual reset control input. Whenever this input is taken logic low (grounded),
the device will immediately force a reset condition. Upon releasing from ground the reset
will remain active for the duration of the reset delay timing TDELAY interval. This contains
an internal pull-up current source and may be left unconnected if not used.
3CT
Capacitor timing control input. The timeout delay interval produced by the external timing
capacitor is 25ms/nF. A temperature stable internal current source (0.2
µA) is used to
accurately control the user programmable delay interval. If no external timing capacitor is
present, the delay timeout interval is 25ms.
4
GND
Negative reference for all voltages.
5
RESET
Active-low reset output. Whenever VOUT falls below the Reset threshold, the logic output
immediately is driven low (to GND). Upon VOUT rising above the Reset threshold, the
logic output remains low (at GND) for an additional delay time duration Td, after which it
is driven to a logic high level (set by VOUT). The power-on reset circuitry remains enabled
under all conditions and produces a valid output logic, even when VCC is not present.
6
RESET
Active-high reset output. Inverse of RESET.
7
SENSE
Positive input voltage to the accurate 1.0 volt threshold comparator. Whenever this input
is below the trigger threshold (1.0V) both logic outputs are immediately held in their
respective Active state. When this input signal rises past the trigger threshold voltage,
the delay timer will start and both logic outputs will still remain Active. Once the delay
time has been reached both logic outputs will toggle to their respective Inactive state.
8VDD
Input power source for the device. The device is designed to operate with supply voltage
of 2.5V or greater. Whenever the supply voltage is below 2.5V (i.e during power-up /
power-down) an internal undervoltage lockout circuit is activated which prevents any
false triggering on the RESET logic outputs. This feature ensures the logic outputs will
"hug" their respective rail and produce valid outputs under all supply conditions. (Con-
ventional Supervisory circuits can generate undefined output conditions during initial
power-up sequences)
PACKAGE / PINOUT DIAGRAM
Note: This drawing is not to scale.
8-pin MSOP
1
2
3
4
8
7
6
5
N.C.
MR
CT
GND
VDD
SENSE
RESET
RESET
Top View
8-pin SOIC
1
2
3
4
8
7
6
5
N.C.
MR
CT
GND
VDD
SENSE
RESET
RESET
Top View


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