SP730
®
Microprocessor Supervisory
Circuit with Pull Up Resistor
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 VDD1.0V
■ 45µA Typical Operating Current
■ Offered in a 3 Pin SOT-23 Package
GND
SP730
3 Pin SOT-23
RESET
VDD
Now Available in Lead Free Packaging
APPLICATIONS
■ Portable Electronic Devices
■ Electrical Power Meter
■ Computer System Board
■ Modem
DESCRIPTION
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 VDD 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
Microcontroller
SP730
VDD
Bypass
Capacitor
VDD
GND
MCLR
or
RESET
RESET
GND
Date: 6/14/04
SP730 Microprocessor Supervisory Circuit
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© Copyright 2004 Sipex Corporation
ABSOLUTE MAXIMUM RATINGS
VDD ................................................................................................. 6.0V
All inputs and outputs w.r.t. GND ............................... -0.6 to VDD+ 1.0V
Storage Temperature .................................................. -65°C to +150°C
Ambient Temperature with power applied.....................-65°C to +125°C
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
VDD = 1.0V - 5.5V ; -40°C to 85°C. The ♦ denotes the specifications which apply over the full operating temperature range, unless otherwise
specified.
Parameter
Operating Voltage Range
VDD Value to RESET
Operating Current
Symbol
Min.
VDD
1.0
VDDMIN
1.0
Typ.
5.5
IDD
VDD Trip Point
VTRIP
Threshold Hysteresis
VHYS
RESET Low Level Output
Voltage
VOL
RESET High Level Output
Voltage
VOH
4.25
VDD Detect to RESET
Date: 6/14/04
V
4.375
4.50
♦
V
♦
mV
♦
V
IOL = 8.5mA, VDD =
VTRIP MIN
♦
V
IOH = 50µA, VDD >
VTRIP MAX
350
700
10
SP730 Microprocessor Supervisory Circuit
2
♦
µA
VDD-.7
tRPD
V
♦
0.6
150
♦
Conditions
60
5
tRPU
Units
45
50
Pull up Resistor
VDD Detect to RESET Inactive
Max.
♦
K
♦
ms
♦
µS
VDD = 5.5V (no load)
VDD ramped from
VTRIP MAX (VTRIP MAX +
250mV) to (VTRIP MIN 250mV)
© Copyright 2004 Sipex Corporation
FUNCTIONAL DIAGRAM
VDD
5kΩ Internal pull
up resistor
Comparator
Delay Circuit
Output Driver
RESET
Bandgap
Reference
TIMING DIAGRAM
VTRIP
VDD
tRPU
tRPD
VOH
RESET
VOH
Figure 1: SP730 Timing Diagram
PIN DESCRIPTION
PIN NUMBER
PIN NAME
1
RESET
2
VDD
3
GND
Date: 6/14/04
3 PIN SOT-23 DESCRIPTION
Active Low. This pin goes low whenever VDD falls below the reset
threshold.
Supply input.
Ground.
SP730 Microprocessor Supervisory Circuit
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© Copyright 2004 Sipex Corporation
TYPICAL PERFORMANCE CHARACTERISTICS
Idd vs Temperature
60
Operating Current (uA)
50
40
30
Idd
20
10
0
-40
-20
0
20
40
60
80
100
Temperature ('C)
tRPU vs Temperature
700
600
Timeout Period (mS)
500
400
tRPU
300
200
100
-40
-20
0
20
40
60
80
100
Temperature ('C)
Date: 6/14/04
SP730 Microprocessor Supervisory Circuit
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© Copyright 2004 Sipex Corporation
TYPICAL PERFORMANCE CHARACTERISTICS
Normalized VTRIP vs Temperature
1.0020
1.0000
Normalized Threshold
0.9980
0.9960
0.9940
0.9920
0.9900
-40
-20
0
20
40
60
80
100
Temperature ('C)
VOL vs IOL
1200
1100
1000
900
800
VOL (mV)
700
Vdd=4.25V
Vdd=3.5V
Vdd=2.5V
600
500
400
300
200
Temp = 25'C
100
0
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)
Date: 6/14/04
SP730 Microprocessor Supervisory Circuit
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© Copyright 2004 Sipex Corporation
3 PIN SOT-23
D
b
B
3
B
E1
1
SEE VIEW C
E
2
e
Gauge Plane
e1
L2
L
L1
VIEW C
Dimensions in (mm)
3 PIN SOT-23
JEDEC TO-236
(AB) Variation
MIN NOM MAX
A
0.89
A1
0.01
A2
-
1.12
-
0.88
.95
-
0.50
c
0.08
-
0.20
2.80
2.10
E1
1.20
L
0.30
A
3.04
-
2.64
C
A1
SIDE VIEW
b
WITH PLATING
1.40
0.45
0.60
c
L1
Ø
2.90
1.30
Seating Plane
1.02
0.30
E
A2
A
0.10
b
D
A
0.54 REF
0º
-
8º
BASE METAL
3 PIN SOT-23
Date: 6/14/04
SP730 Microprocessor Supervisory Circuit
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© Copyright 2004 Sipex Corporation
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.
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
/TR = Tape and Reel
Pack quantity is 2500 for SOT-23.
Corporation
ANALOG EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
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.
Date: 6/14/04
SP730 Microprocessor Supervisory Circuit
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© Copyright 2004 Sipex Corporation