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
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] = (R
1
+ R
2
) / R
2
The delay time is set by an external capacitor C
T
, as
follows (where C
T
is in [nF]):
Reset Delay [ms] = (375 x C
T
[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.
Applications
•
•
•
Critical power monitoring
Power-up sequencing
Memory integrity during "brownouts"
Typical Application Circuit
Simplified Electrical Schematic
V
DD
CM3400
R
1
+
R
2
-
C
T
GND
CT
GND
GND
C
T
1µA
V
DD
SENSE
RESET
MR
RESET
uP or
Memory
Control
MR
Falling Edge Delay
100K
V
TH
+
EN
t
DELAY
RESET
RESET
200K
SENSE
-
© 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
PACKAGE / PINOUT DIAGRAM
Top View
N.C.
MR
C
T
GND
1
2
3
4
8
7
6
5
Top View
VDD
SENSE
RESET
RESET
N.C.
MR
C
T
GND
1
2
3
4
8
7
6
5
VDD
SENSE
RESET
RESET
8-pin SOIC
Note: This drawing is not to scale.
8-pin MSOP
PIN DESCRIPTIONS
PIN(S)
1
2
NAME
N.C.
MR
DESCRIPTION
No connect.
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 T
DELAY
interval. This contains
an internal pull-up current source and may be left unconnected if not used.
Capacitor timing control input. The timeout delay interval produced by the external timing
capacitor is 25ms/nF. A temperature stable internal current source (0.2µA) is used to
accurately control the user programmable delay interval. If no external timing capacitor is
present, the delay timeout interval is 25ms.
Negative reference for all voltages.
Active-low reset output. Whenever V
OUT
falls below the Reset threshold, the logic output
immediately is driven low (to GND). Upon V
OUT
rising above the Reset threshold, the
logic output remains low (at GND) for an additional delay time duration T
d
, after which it
is driven to a logic high level (set by V
OUT
). The power-on reset circuitry remains enabled
under all conditions and produces a valid output logic, even when V
CC
is not present.
Active-high reset output. Inverse of RESET.
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.
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)
3
C
T
4
5
GND
RESET
6
7
RESET
SENSE
8
V
DD
© 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
Ordering Information
PART NUMBERING INFORMATION
Pins
8
8
Package
MSOP-8
SOIC-8
Ordering Part Number
2
CM3400-00MS
CM3400-00SN
Part Marking
171CMD
CMPWR171SN
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER
ESD Protection (HBM)
Pin Voltages
V
DD
, SENSE, MR, C
T
Inputs
RESET, RESET Outputs
Storage Temperature Range
Operating Temperature Range
Ambient
RATING
+1500
[GND - 0.5] to +6.5
[GND - 0.5] to [V
DD
+ 0.5]
-40 to +150
-40 to +125
UNITS
V
V
V
°C
°C
STANDARD OPERATING CONDITIONS
PARAMETER
V
DD
Supply
SENSE Input
C
T
Timing Capacitor
Ambient Operating Temperature Range
VALUE
2.5 to 5.5
0 to 5.5
0 to 3.3
0 to +70
UNITS
V
V
nF
°C
© 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
3
CM3400
Specifications (cont’d)
ELECTRICAL OPERATING CHARACTERISTICS
1
SYMBOL
V
TH
I
SENSE
I
CT
T
DELAY
PARAMETER
SENSE Threshold Trigger Level
SENSE Input Bias Current
Timing Current Source
Timing Capacitor Delay (applies
to RESET & RESET outputs)
C
T
not connected (default)
C
T
= 0.1nF
C
T
= 1nF
I
GND
t
PHL
Ground Current
Propagation Delay When Assert-
ing RESET
No load.
SENSE < (V
TH
- 50mV)
0.10
15
35
225
0.16
25
55
325
40
0.5
CONDITIONS
MIN
0.95
TYP
1.00
MAX
1.05
1
0.25
35
75
425
70
5
UNITS
V
µA
µA
mS
mS
mS
µA
µS
RESET Pin
R
PULLUP
R
PULLDOWN
RESET Pull-up Impedance
RESET Pull-down Impedance
V
DD
< 1.0V
V
DD
> 2.5V
100
0.5
0.5
500
3
3
kΩ
kΩ
kΩ
RESET Pin
R
PULLDOWN
R
PULLUP
RESET Pull-down Impedance
RESET Pull-up Impedance
V
DD
< 1.0V
V
DD
> 2.5V
200
0.5
0.5
500
3
3
kΩ
kΩ
kΩ
MR Pin
I
MR
V
IH MR
V
IL MR
t
MR
Internal Pull-up Current
High Detect Input Level
Low Detect Input Level
Propagation Delay
0.5
1.5
0.3
2
2
5
µA
V
V
µS
Note 1: Electrical Operating Characteristics are specified over the Standard Operating Conditions unless specified otherwise.
© 2003 California Micro Devices Corp. All rights reserved.
4
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
Performance Information
CM3400 Typical Transient Characteristics (nominal conditions unless specified otherwise)
Transient Operation Description (V
DD
> 2.5V)
Actual Transient Operation
Threshold Trigger Voltage vs. Supply
1100
1000
THRESHOLD [mV]
RESET Comparator Response With Overdrive
4
900
800
700
600
500
2.0
2.5
3.0
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE [V]
RESPONSE [us]
3
2
1
0
0
50
100
OVERDRIVE [mV]
150
200
Timeout Delay With CT Capacitance
1000
TIMEOUT DELAY [ms]
100
10
0.01
0.10
CT [nF]
1.00
© 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
5
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