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 (40µA typ.)
No external components required
3-pin SOT23 package
"809" compatible pinout
Lead-free versions available
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.
Applications
•
•
•
Critical µP and µC power monitoring
PCI applications
Memory integrity during "brownouts"
Typical Application Circuit
Simplified Electrical Schematic
V
IN
CM3403
V
CC
Microprocessor
V
CC
+
-
RESET
GND
RESET
GND
GND
Rising Edge
Delay
RESET
R
PULLDOWN
V
CC
Threshold
Reference
©
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
PACKAGE / PINOUT DIAGRAM
Top View
GND
1
17xx
RESET
2
3
V
CC
3-pin SOT23
Note: This drawing is not to scale.
PIN DESCRIPTIONS
PIN(S)
1
2
NAME
GND
RESET
DESCRIPTION
Negative reference for all signals.
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.
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.
3
V
CC
Ordering Information
PART NUMBERING INFORMATION
Standard Finish
Pins
3
3
Threshold
Voltage
2.93V
4.63V
Package
SOT23-3
SOT23-3
Ordering Part
Number
1
CM3403-29ST
CM3403-46ST
Part Marking
172Y
174Y
Lead-free Finish
Ordering Part
Number
1
CM3403-29SO
CM3403-46SO
Part Marking
172R
174R
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
©
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
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Pin Voltages
V
CC
RESET
Storage Temperature Range
Operating Temperature Range
Ambient
RATING
[GND - 0.5] to +6.5
[GND - 0.5] to [V
CC
+ 0.5]
-40 to +150
-40 to +125
UNITS
V
V
°C
°C
STANDARD OPERATING CONDITIONS
PARAMETER
V
CC
Ambient Operating Temperature Range
VALUE
0 to 6.0
0 to +70
UNITS
V
°C
ELECTRICAL OPERATING CHARACTERISTICS
(SEE NOTE 1)
SYMBOL
V
TH
PARAMETER
Sense Threshold
CONDITIONS
CM3403-29, T
A
=25°C
CM3403-29
CM3403-46, T
A
=25°C
CM3403-46
I
CC
T
DELAY
t
PHL
R
PULLDOWN
R
PULLUP
Supply Current
Reset Release Delay
Propagation Delay when assert-
ing RESET
RESET Pull-Down Resistance
RESET Pull-Up Resistance
V
CC
< (V
TH
- 50mV)
V
CC
> 1.5V
V
CC
> V
TH
and t > T
DELAY
No load, V
CC
=5V
140
0.2
0.5
0.5
MIN
2.89
2.85
4.56
4.5
TYP
2.93
2.93
4.63
4.63
40
MAX
2.96
3.00
4.7
4.75
80
460
5
3
3
UNITS
V
V
V
V
µA
mS
µS
kΩ
kΩ
Note 1: Electrical Operating Characteristics are specified over the Standard Operating Conditions unless specified otherwise.
©
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
Performance Information
CM3403 Typical Characteristics (nominal conditions unless specified otherwise)
Reset Response with Overdrive
4
GROUND CURRENT [uA]
Ground Current vs. Voltage
50
40
30
20
10
0
Transient Duration [us]
3
2
1
0
0
50
100
150
Reset Threshold Overdrive [mV]
200
0
1
2
3
4
5
SUPPLY VOLTAGE [V]
Below Trigger RESET* Pull-down
1000
PULL DOWN RESISTANCE [kΩ ]
PULL UP RESISTANCE [kΩ]
Above Trigger RESET* Pull-up
0.6
0.5
0.4
0.3
0.2
0.1
0.0
100
10
1
0
0
1
2
SUPPLY VOLTAGE [V]
3
2
3
4
SUPPLY VOLTAGE [V]
5
6
©
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 (cont’d)
CM3403 Typical Thermal Characteristics (nominal conditions unless specified otherwise)
RESET Propagation Delay vs. Temperature
t
PHL - Reset Propogation Delay [ns]
TDELAY - Reset Release Delay [ms]
RESET Release Delay vs. Temperature
600
550
500
450
400
350
300
25
50
75
Temperature [
o
C]
100
125
220
215
210
205
200
195
190
185
180
25
50
75
100
o
Temperature [ C]
125
Ground Current vs. Temperature
40
Reset Threshold Change [mV]
Threshold variation vs. Temperature
20
15
10
5
0
-5
-10
-15
-20
35
30
IGND [uA]
25
20
15
10
5
0
25
50
75
100
Temperature [
o
C]
125
25
50
75
100
Temperature [
o
C]
125
©
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
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