®
Preliminary
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 to V
DD
=1.0V
■
45µA Typical Operating Current
■
Offered in a 3 Pin SOT-23 Package
APPLICATIONS
■
Networking
■
Computer
■
Industrial Process Control
GND
SP730
3 Pin SOT-23
RESET
V
DD
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. TThe SP730
has an internal 5k pull-up resistor. Both devices have active low RESET pins. The SP730 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 volatage options. Contact factory for other trip voltage options.
TYPICAL APPLICATION CIRCUIT
VDD
VDD
Microcontroller
VDD
®
Bypass
Capacitor
GND
SP730
RESET
MCLR
or
RESET
GND
Rev:A Date: 01/22/04
SP730 Microprocessor Supervisory Circuit
© Copyright 2004 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
V
DD
................................................................................................. 6.0V
All inputs and outputs w.r.t. GND .............................. -0.6 to V
DD
+ 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
V
DD
= 1.0V - 5.0V ; T
AMB =
-40°C to 85°C.
The
♦
denotes the specifications which apply over the full operating temperature range, unless
otherwise specified.
Parameter
Operating Voltage Range
V
DD
Value to RESET
Operating Current
V
DD
Trip Point
Threshold Hysteresis
RESET Low Level Output Voltage
RESET High Level Output Voltage
Pull up Resistor
V
DD
Detect to RESET Inactive
Symbol
V
DD
V
DDMIN
I
DD
V
TRIP
V
HYS
V
OL
V
OH
Min.
1.0
1.0
Typ.
Max.
5.5
♦
♦
Units
V
V
µA
V
mV
V
V
K
Ω
ms
Conditions
I
OH
= 50µA
V
DD
= 5.5V (no load)
45
4.25
4.375
50
60
4.50
♦
♦
♦
0.6
V
DD
-.7
5
♦
I
OL
= 8.5mA, V
DD
=
V
TRIP MIN
I
OH
= 50µA, V
DD
>
V
TRIP MAX
♦
♦
t
RUP
150
350
700
♦
V
DD
Detect to RESET
t
RPD
10
♦
V
DDC
ramped from
V
TRIP MAX
(V
TRIP MAX +
250mV) to (V
TRIP MIN -
250mV)
Rev:A Date: 01/22/04
SP730 Microprocessor Supervisory Circuit
© Copyright 2004 Sipex Corporation
2
FUNCTIONAL DIAGRAM
V
DD
Comparator
Delay Circuit
Output Driver
RESET
Bandgap
Reference
5kΩ Internal pull
up resistor
TIMING DIAGRAM
V
TRIP
V
DD
tRPU
tRPD
V
OH
RESET
V
OH
Figure 1: SP730 Timing Diagram
PIN DESCRIPTION
PIN NUMBER
1
2
3
PIN NAME
RESET
V
DD
GND
5 PIN SOT-23 DESCRIPTION
Active Low. This pin goes low whenever V
DD
falls below the reset
threshold.
Supply input.
Ground.
Rev:A Date: 01/22/04
SP730 Microprocessor Supervisory Circuit
© Copyright 2004 Sipex Corporation
3
3 PIN SOT-23
D
b
3
B
B
E1
E
SEE VIEW C
1
e
2
e1
L
L1
Gauge Plane
L2
VIEW C
3 PIN SOT-23
JEDEC TO-236
(AB) Variation
MIN NOM MAX
0.89
0.01
0.88
0.30
0.08
2.80
2.10
1.20
0.30
-
-
.95
-
-
2.90
-
1.30
0.45
0.54 REF
0º
-
8º
1.12
0.10
1.02
0.50
0.20
3.04
2.64
1.40
0.60
A
A1
Dimensions in (mm)
A
A
A2
Seating Plane
C
A
A1
A2
b
c
D
E
E1
L
L1
Ø
SIDE VIEW
b
WITH PLATING
c
BASE METAL
3 PIN SOT-23
Rev:A Date: 01/22/04
SP730 Microprocessor Supervisory Circuit
© Copyright 2004 Sipex Corporation
4
ORDERING INFORMATION
Part number
Package Type
SP730M-2.625 ......................................................................................... 3 Pin SOT-23
SP730M-2.925 ......................................................................................... 3 Pin SOT-23
SP730M-3.075 ......................................................................................... 3 Pin SOT-23
SP730M-4.375 ......................................................................................... 3 Pin SOT-23
SP730M-4.475 ......................................................................................... 3 Pin SOT-23
SP730M-4.625 ......................................................................................... 3 Pin SOT-23
SP730M-4.725 ......................................................................................... 3 Pin 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
Sales Office
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: sales@sipex.com
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.
Rev:A Date: 01/22/04
SP730 Microprocessor Supervisory Circuit
© Copyright 2004 Sipex Corporation
5
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