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SP730
Microprocessor Supervisory Circuit with Pull Up Resistor
FEATURES Holds Microcontroller in Reset Reset Microcontroller during power loss 4.375 and 3.075 Voltage Trip Points Active Low Pin Internal Pull-up Resistor Holds RESET for 350ms (typical) RESET valid down to VDD1.0V 45A 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 GND RESET
Bypass Capacitor
VDD
MCLR or RESET GND
Date: 11/15/05
SP730 Microprocessor Supervisory Circuit
(c) Copyright 2005 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
VDD ................................................................................................. 6.0V All inputs and outputs w.r.t. GND ............................... -0.6 to VDD+ 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
VDD = 1.0V - 5.5V ; -40C to 85C. 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 VDD VDDMIN IDD
Min. 1.0 1.0
Typ.
Max. 5.5

Units V V A
Conditions
45 3.0 3.075 4.375 50
60 3.15 4.50

VDD = 5.5V (no load)
VDD Trip Point
VTRIP 4.25
V

Threshold Hysteresis RESET Low Level Output Voltage RESET High Level Output Voltage Pull up Resistor VDD Detect to RESET Inactive
VHYS VOL VOH VDD-.7
mV V V K ms VDD ramped from VTRIP MAX (VTRIP MAX + 250mV) to (VTRIP MIN 250mV) IOL = 8.5mA, VDD = VTRIP MIN IOH = 50A, VDD > VTRIP MAX
0.6

5 tRPU 150 350 700

VDD Detect to RESET
tRPD
10
S
PIN DESCRIPTION
PIN NUMBER 1 2 3 PIN NAME RESET VDD GND 3 PIN SOT-23 DESCRIPTION Active Low. This pin goes low whenever VDD falls below the reset threshold. Supply input. Ground.
Date: 11/15/05
SP730 Microprocessor Supervisory Circuit
(c) Copyright 2005 Sipex Corporation
2
FUNCTIONAL DIAGRAM
VDD Comparator Delay Circuit Output Driver RESET Bandgap Reference 5k Internal pull up resistor
TIMING DIAGRAM
VTRIP VDD
tRPU tRPD
VOH
RESET
VOH
Figure 1: SP730 Timing Diagram
Date: 11/15/05
SP730 Microprocessor Supervisory Circuit
(c) Copyright 2005 Sipex Corporation
3
TYPICAL PERFORMANCE CHARACTERISTICS
Idd vs Temperature
60
50
Operating Current (uA)
40
30
Idd
20
10
0 -40 -20 0 20 Temperature ('C) 40 60 80 100
tRPU vs Temperature
700
600
500
Timeout Period (mS)
400
tRPU
300
200
100 -40
-20
0
20 Temperature ('C)
40
60
80
100
Date: 11/15/05
SP730 Microprocessor Supervisory Circuit
(c) Copyright 2005 Sipex Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS
Normalized VTRIP vs Temperature
1.0020
1.0000
0.9980
Normalized Threshold
0.9960
0.9940
0.9920
0.9900 -40 -20 0 20 Temperature ('C) 40 60 80 100
VOL vs IOL
1200 1100 1000 900 800 700
VOL (mV)
600 500 400 300 200
Vdd=4.25V Vdd=3.5V Vdd=2.5V
Temp = 25'C
100 0 0 1 2 3.2 4 5 6 7 8.5 9 10 IOL (mA) 11 12 13 14 15 16 17 18 19 20
Date: 11/15/05
SP730 Microprocessor Supervisory Circuit
(c) Copyright 2005 Sipex Corporation
5
3 PIN SOT-23
D b
3
SIDE VIEW
E1
E
A
A2 Seating Plane
A1
1 2
(L1)
e e1
TOP VIEW
FRONT VIEW
Gauge Plane L2 o L Seating Plane c
3 Pin SOT-23
SYMBOL
JEDEC TO-236
Variation AB Dimensions in Inches Conversion Factor: 1 Inch = 25.40 mm MIN 0.012 0.003 0.110 0.083 0.047 NOM 0.114 0.051 0.038 BSC 0.075 BSC 0.020 0.021 REF 0.010 BSC 0.037 MAX 0.020 0.008 0.120 0.104 0.055
Dimensions in Millimeters: Controlling Dimension MIN 0.30 0.08 2.80 2.10 1.20 NOM MAX 0.50 0.20 2.90 3.04 2.64 1.30 1.40 0.95 BSC 1.90 BSC 0.50 0.60 0.54 REF 0.25 BSC 8 1.12 0.10 0.95 1.02 Signoff Date/Rev:
b c D E E1 e e1 L L1 L2 O A A1 A2
0.40
0.016
0.024
0 0.89 0.01 0.88 SIPEX Pkg
0 0.035 0.000 0.035
8 0.044 0.004 0.040
JL Oct25-05 / Rev A
Date: 11/15/05
SP730 Microprocessor Supervisory Circuit
(c) Copyright 2005 Sipex Corporation
6
ORDERING INFORMATION Part number Top Mark Temperature Vout Package
SP730EK-4-375...............V3WW................-40-85................4.375V...........3 Pin SOT-23 SP730EK-4-375/TR.........V3WW................-40-85................4.375V...........3 Pin SOT-23 SP730EK-3-075...............M4WW................-40-85...............3.075V...........3 Pin SOT-23 SP730EK-3-075/TR.........M4WW................-40-85................3.075V...........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-L-4-375/TR = lead free /TR = Tape and Reel Pack quantity is 2500 for SOT-23.
Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
Solved By SipexTM
Date: 11/15/05
SP730 Microprocessor Supervisory Circuit
(c) Copyright 2005 Sipex Corporation
7

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