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Date: 6/14/04 SP730 Microprocessor Supervisory Circuit
Copyright 2004 Sipex Corporation
Microprocessor Supervisory
Circuit with Pull Up Resistor
SP730
DESCRIPTION
FEATURES
Holds Microcontroller in Reset
Reset Microcontroller during power loss
4.375 Voltage Trip Point
Active Low RESET Pin
Internal Pull-up Resistor
Holds RESET for 350ms (typical)
RESET valid down to V
DD
1.0V
45A Typical Operating Current
Offered in a 3 Pin SOT-23 Package
The SP730 is a voltage supervisory device designed to keep a microcontroller in reset until the
system voltage has reached the proper level and stabilized. It also operates as protection from
brown-out conditions when the supply voltage drops below a safe operating level. The SP730
has an internal 5k pull-up resistor. The device has an active low RESET pin and will assert the
RESET signal whenever the voltage on the V
DD
pin is below the trip-point voltage. The part is
available in a small 3 pin SOT-23 package. Contact factory for other trip voltage options.
TYPICAL APPLICATION CIRCUIT
VDD
SP730
RESET
VDD
Microcontroller
GND
MCLR
RESET
or
Bypass
Capacitor
GND
VDD
SP730
3 Pin SOT-23
RESET
V
DD
GND
APPLICATIONS
Portable Electronic Devices
Electrical Power Meter
Computer System Board
Modem
Now Available in Lead Free Packaging
2
Date: 6/14/04 SP730 Microprocessor Supervisory Circuit
Copyright 2004 Sipex Corporation
V
DD
................................................................................................. 6.0V
All inputs and outputs w.r.t. GND ............................... -0.6 to V
DD
+ 1.0V
Storage Temperature .................................................. -65C to +150C
Ambient Temperature with power applied.....................-65C to +125C
ESD Protection on all pins ............................................................ 2kV
These are stress ratings only and functional operation of the device at
these ratings or any other above those indicated in the operation sections
of the specifications below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may affect reliability.
ELECTRICAL CHARACTERISTICS
V
DD
= 1.0V - 5.5V ; -40C to 85C.
The
denotes the specifications which apply over the full operating temperature range, unless otherwise
specified.
ABSOLUTE MAXIMUM RATINGS
r
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m
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5
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7
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5
=
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(
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)
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m
0
5
2
-
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I
M
P
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R
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)
V
m
0
5
2
3
Date: 6/14/04 SP730 Microprocessor Supervisory Circuit
Copyright 2004 Sipex Corporation
5k Internal pull
up resistor
Delay Circuit
Output Driver
Bandgap
Reference
V
DD
Comparator
RESET
FUNCTIONAL DIAGRAM
TIMING DIAGRAM
Figure 1: SP730 Timing Diagram
RESET
V
DD
tRPU
V
TRIP
V
OH
V
OH
tRPD
PIN NUMBER
PIN NAME
3 PIN SOT-23 DESCRIPTION
1
RESET
Active Low. This pin goes low whenever V
DD
falls below the reset
threshold.
2
V
DD
Supply input.
3
GND
Ground.
PIN DESCRIPTION
4
Date: 6/14/04 SP730 Microprocessor Supervisory Circuit
Copyright 2004 Sipex Corporation
Idd vs Temperature
0
10
20
30
40
50
60
-40
-20
0
20
40
60
80
100
Temperature ('C)
Operating Current (uA)
Idd
tRPU vs Temperature
100
200
300
400
500
600
700
-40
-20
0
20
40
60
80
100
Temperature ('C)
Timeout Period (mS)
tRPU
TYPICAL PERFORMANCE CHARACTERISTICS
5
Date: 6/14/04 SP730 Microprocessor Supervisory Circuit
Copyright 2004 Sipex Corporation
Normalized VTRIP vs Temperature
0.9900
0.9920
0.9940
0.9960
0.9980
1.0000
1.0020
-40
-20
0
20
40
60
80
100
Temperature ('C)
Normalized Threshold
VOL vs IOL
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
0
1
2
3.2
4
5
6
7
8.5
9
10
11
12
13
14
15
16
17
18
19
20
IOL (mA)
VOL (mV)
Vdd=4.25V
Vdd=3.5V
Vdd=2.5V
Temp = 25'C
TYPICAL PERFORMANCE CHARACTERISTICS
6
Date: 6/14/04 SP730 Microprocessor Supervisory Circuit
Copyright 2004 Sipex Corporation
3 PIN SOT-23
A
A2
A1
SIDE VIEW
A
A
Seating Plane
C
c
WITH PLATING
BASE METAL
b
E
E1
e
e1
D
b
1
2
3
L1
L
L2
Gauge Plane
VIEW C
SEE VIEW C
B
B
0.89 - 1.12
0.01 - 0.10
Dimensions in (mm)
3 PIN SOT-23
JEDEC TO-236
(AB) Variation
0.88 .95 1.02
0.30 - 0.50
0.08 - 0.20
0.30 0.45 0.60
0.54 REF
0 - 8
A
A1
A2
b
c
D
E
E1
L
L1
MIN NOM MAX
2.80 2.90 3.04
2.10 - 2.64
1.20 1.30 1.40
3 PIN SOT-23
7
Date: 6/14/04 SP730 Microprocessor Supervisory Circuit
Copyright 2004 Sipex Corporation
Corporation
ANALOG EXCELLENCE
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
ORDERING INFORMATION
Part number Top Mark Temperature Package
SP730EK-4.375...............V3WW................-40-85..............................3 Pin SOT-23
SP730EK-4.375/TR.........V3WW................-40-85..............................3 Pin SOT-23
Contact factory for other trip voltage options.
/TR = Tape and Reel
Pack quantity is 2500 for SOT-23.
Available in lead free packaging. To order add "-L" suffix to part number.
Example: SP730EK-4.375/TR = standard; SP730EK-4.375-L/TR = lead free
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