2004 California Micro Devices Corp. All rights reserved.
10/29/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
Tel: 408.263.3214
Fax: 408.263.7846
www.calmicro.com
1
CM3403
Micropower Supply Voltage Supervisor (SVS)
Features
Precision voltage sensor
Two threshold options: 2.93V or 4.63V
Stable over temperature
Valid output logic while V
CC
= 0V.
Power-on reset pulse width of
140ms (min.) to 460ms (max.)
Low quiescent current (40A typ.)
No external components required
3-pin SOT23 package
"809" compatible pinout
Lead-free versions available
Applications
Critical P and C power monitoring
PCI applications
Memory integrity during "brownouts"
Product Description
The CM3403 is a micropower low voltage supply
supervisor designed to provide the necessary power-
on reset control for microprocessors and memory
applications. An internal pull-down resistor on the
RESET output ensures the output remains valid under
all supply conditions.
During either a cold-start power-up or a complete
power-down sequence, the RESET output will remain
at 0V while the V
CC
input voltage is between the
threshold level and ground.
When the V
CC
input exceeds the preset threshold volt-
age, an internal timer is triggered and the RESET out-
put remains active for a minimum of 140ms, at which
point the output is taken inactive.
In the event of a "brown-out" condition and the V
CC
voltage collapses below the threshold the RESET out-
put is immediately asserted.
Both the trigger threshold and the precision delay pulse
are internally controlled eliminating the requirement for
external components.
The CM3403 is housed in a 3-pin SOT23 package and
is available with optional lead-free finishing.
Simplified Electrical Schematic
Typical Application Circuit
V
CC
Threshold
+
GND
-
Rising Edge
RESET
Delay
Reference
R
PULLDOWN
V
CC
RESET
GND
Microprocessor
V
IN
V
CC
RESET
GND
CM3403
2004 California Micro Devices Corp. All rights reserved.
2
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
Tel: 408.263.3214
Fax: 408.263.7846
www.calmicro.com
10/29/04
CM3403
Ordering Information
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
PIN DESCRIPTIONS
PIN(S)
NAME
DESCRIPTION
1
GND
Negative reference for all signals.
2
RESET
Active low reset output. When the sense threshold has been exceeded, the RESET signal will
remain active for an additional 140ms (min.) after which it becomes inactive. During a "brownout"
condition, RESET will immediately become active. Internal circuitry ensures RESET will remain
active even when the supply voltage is as low as 0V.
3
V
CC
Supply input signal which is monitored by the sense comparator. This input is compared to the
2.93V (CM3403-29ST/SO) or 4.63 (CM3403-46ST/SO) reference to determine the state of the out-
put.
PACKAGE / PINOUT DIAGRAM
Note: This drawing is not to scale.
3-pin SOT23
GND
RESET
V
CC
1
2
3
Top View
17xx
PART NUMBERING INFORMATION
Pins
Threshold
Voltage
Package
Standard Finish
Lead-free Finish
Ordering Part
Number
1
Part Marking
Ordering Part
Number
1
Part Marking
3
2.93V
SOT23-3
CM3403-29ST 172Y
CM3403-29SO 172R
3
4.63V
SOT23-3
CM3403-46ST
174Y
CM3403-46SO
174R
2004 California Micro Devices Corp. All rights reserved.
10/29/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
Tel: 408.263.3214
Fax: 408.263.7846
www.calmicro.com
3
CM3403
Specifications
Note 1: Electrical Operating Characteristics are specified over the Standard Operating Conditions unless specified otherwise.
ABSOLUTE MAXIMUM RATINGS
PARAMETER
RATING
UNITS
Pin Voltages
V
CC
RESET
[GND - 0.5] to +6.5
[GND - 0.5] to [V
CC
+ 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
CC
0 to 6.0
V
Ambient Operating Temperature Range
0 to +70
C
ELECTRICAL OPERATING CHARACTERISTICS
(SEE NOTE 1)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
TH
Sense Threshold
CM3403-29, T
A
=25C
2.89
2.93
2.96
V
CM3403-29
2.85
2.93
3.00
V
CM3403-46, T
A
=25C
4.56
4.63
4.7
V
CM3403-46
4.5
4.63
4.75
V
I
CC
Supply Current
No load, V
CC
=5V
40
80
A
T
DELAY
Reset Release Delay
140
460
mS
t
PHL
Propagation Delay when assert-
ing RESET
V
CC
< (V
TH
- 50mV)
0.2
5
S
R
PULLDOWN
RESET Pull-Down Resistance
V
CC
> 1.5V
0.5
3
k
R
PULLUP
RESET Pull-Up Resistance
V
CC
> V
TH
and t > T
DELAY
0.5
3
k
2004 California Micro Devices Corp. All rights reserved.
4
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
Tel: 408.263.3214
Fax: 408.263.7846
www.calmicro.com
10/29/04
CM3403
Performance Information
CM3403 Typical Characteristics (nominal conditions unless specified otherwise)
Reset Response with Overdrive
0
1
2
3
4
0
50
100
150
200
Reset Threshold Overdrive [mV]
Transient
Duration
[us]
Ground Current vs. Voltage
0
10
20
30
40
50
0
1
2
3
4
5
SUPPLY VOLTAGE [V]
GROUND
CURRENT
[uA]
Below Trigger RESET* Pull-down
0
1
10
100
1000
0
1
2
3
SUPPLY VOLTAGE [V]
PULL
DOWN
RESISTANCE
[k
]
Above Trigger RESET* Pull-up
0.0
0.1
0.2
0.3
0.4
0.5
0.6
2
3
4
5
6
SUPPLY VOLTAGE [V]
PULL
UP
RESISTANCE
[k
]
2004 California Micro Devices Corp. All rights reserved.
10/29/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
Tel: 408.263.3214
Fax: 408.263.7846
www.calmicro.com
5
CM3403
Performance Information (cont'd)
CM3403 Typical Thermal Characteristics (nominal conditions unless specified otherwise)
RESET Propagation Delay vs. Temperature
180
185
190
195
200
205
210
215
220
25
50
75
100
125
Temperature [
o
C]
t
PHL
-
Reset
Propogation
Delay
[ns]
RESET Release Delay vs. Temperature
300
350
400
450
500
550
600
25
50
75
100
125
Temperature [
o
C]
T
DELAY
-
Reset
Release
Delay
[ms]
Ground Current vs. Temperature
0
5
10
15
20
25
30
35
40
25
50
75
100
125
Temperature [
o
C]
I GND
[uA]
Threshold variation vs. Temperature
-20
-15
-10
-5
0
5
10
15
20
25
50
75
100
125
Temperature [
o
C]
Reset
Threshold
Change
[mV]
2004 California Micro Devices Corp. All rights reserved.
6
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
Tel: 408.263.3214
Fax: 408.263.7846
www.calmicro.com
10/29/04
CM3403
Mechanical Details
SOT23-3 Mechanical Specifications
Dimensions for CM3403 devices packaged in 3-lead
SOT23 packages are presented below.
For complete information on the SOT23-3 package,
see the California Micro Devices SOT23 Package
Information document.
Package Dimensions for SOT23-3.
PACKAGE DIMENSIONS
Package
SOT23-3
JEDEC No.
TO-236 (Var. AB)
Pins/Leads
3
Dimensions
Millimeters
Inches
Min
Max
Min
Max
A
0.89
1.12
0.0350
0.0441
A1
0.01
0.10
0.0004
0.0039
b
0.30
0.50
0.0118
0.0197
c
0.08
0.20
0.0031
0.0079
D
2.80
3.04
0.1102
0.1197
E
2.10
2.64
0.0827
0.1039
E1
1.20
1.40
0.0472
0.0551
e
0.95 BSC
0.0374 BSC
e1
1.90 BSC
0.0748 BSC
L
0.40
0.60
0.0157
0.0236
L1
0.54 REF
0.0213 REF
# per tape
and reel
3000 pieces
Controlling dimension: millimeters
Mechanical Package Diagrams
TOP VIEW
e
E1 E
A
SIDE VIEW
L1
END VIEW
D
A1
c
1
2
e1
b
L
3
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