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
A 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] = (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.
Simplified Electrical Schematic
Typical Application Circuit
SENSE
MR
RESET
GND
+
-
C
T
CT
R
1
GND
CM3400
RESET
V
DD
uP or
Memory
Control
R
2
SENSE
V
TH
+
GND
-
Falling Edge Delay
RESET
200K
t
DELAY
C
T
100K
RESET
MR
V
DD
EN
1
A
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.
2
MR
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.
3
C
T
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
A) 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 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.
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.
8
V
DD
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
C
T
GND
VDD
SENSE
RESET
RESET
Top View
8-pin SOIC
1
2
3
4
8
7
6
5
N.C.
MR
C
T
GND
VDD
SENSE
RESET
RESET
Top View
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
Ordering Information
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
Specifications
PART NUMBERING INFORMATION
Pins
Package
Ordering Part Number
2
Part Marking
8
MSOP-8
CM3400-00MS
171CMD
8
SOIC-8
CM3400-00SN
CMPWR171SN
ABSOLUTE MAXIMUM RATINGS
PARAMETER
RATING
UNITS
ESD Protection (HBM)
+1500
V
Pin Voltages
V
DD
, SENSE, MR, C
T
Inputs
RESET, RESET Outputs
[GND - 0.5] to +6.5
[GND - 0.5] to [V
DD
+ 0.5]
V
V
Storage Temperature Range
-40 to +150
C
Operating Temperature Range
Ambient
-40 to +125
C
STANDARD OPERATING CONDITIONS
PARAMETER
VALUE
UNITS
V
DD
Supply
2.5 to 5.5
V
SENSE Input
0 to 5.5
V
C
T
Timing Capacitor
0 to 3.3
nF
Ambient Operating Temperature Range
0 to +70
C
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
Specifications (cont'd)
RESET Pin
RESET Pin
MR Pin
Note 1: Electrical Operating Characteristics are specified over the Standard Operating Conditions unless specified otherwise.
ELECTRICAL OPERATING CHARACTERISTICS
1
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
TH
SENSE Threshold Trigger Level
0.95
1.00
1.05
V
I
SENSE
SENSE Input Bias Current
1
A
I
CT
Timing Current Source
0.10
0.16
0.25
A
T
DELAY
Timing Capacitor Delay (applies
to RESET & RESET outputs)
C
T
not connected (default)
15
25
35
mS
C
T
= 0.1nF
35
55
75
mS
C
T
= 1nF
225
325
425
mS
I
GND
Ground Current
No load.
40
70
A
t
PHL
Propagation Delay When Assert-
ing RESET
SENSE < (V
TH
- 50mV)
0.5
5
S
R
PULLUP
RESET Pull-up Impedance
V
DD
< 1.0V
V
DD
> 2.5V
100
0.5
500
3
k
k
R
PULLDOWN
RESET Pull-down Impedance
0.5
3
k
R
PULLDOWN
RESET Pull-down Impedance
V
DD
< 1.0V
V
DD
> 2.5V
200
0.5
500
3
k
k
R
PULLUP
RESET Pull-up Impedance
0.5
3
k
I
MR
Internal Pull-up Current
0.5
2
5
A
V
IH MR
High Detect Input Level
1.5
V
V
IL MR
Low Detect Input Level
0.3
V
t
MR
Propagation Delay
2
S
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
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
500
600
700
800
900
1000
1100
2.0
2.5
3.0
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE [V]
THRESHOLD [mV]
RESET Comparator Response With Overdrive
0
1
2
3
4
0
50
100
150
200
OVERDRIVE [mV]
RESPONSE [us]
Timeout Delay With CT Capacitance
10
100
1000
0.01
0.10
1.00
CT [nF]
TIMEOUT DELAY [ms
]
PDF 
ZIP