SP809 / SP810
3 Pin Microprocessor Supervisor Circuit
February 2011
Rev. 2.0.0
GENERAL DESCRIPTION
The
SP809/SP810
are
low
power
microprocessor (μP) supervisory circuits used
to monitor power supplies in
μP
and digital
systems.
They provide applications with benefits of
circuit reliability and low cost by eliminating
external components. If the VCC supply
voltage falls below preset threshold then a
reset signal is asserted for at least 140ms
after V
CC
has risen above the reset threshold.
Both the SP809 and SP810 were designed with
a reset comparator to help identify invalid
signals, which last less than 140ms. The only
difference between them is that they have an
active-low
RESET
output and active-high
RESET output, respectively. Low supply
current (1μA) makes SP809/SP810 ideal for
portable equipment.
The devices are available in 3 pin SOT-23
package.
APPLICATIONS
•
Portable Electronic Devices
•
Electrical Power Meters
•
Digital Still Cameras
•
µP Power Monitoring
FEATURES
•
Ultra Low Supply Current 1µA (typ)
•
Guaranteed Reset valid to V
CC
= 0.9V
•
140ms Power-On Reset Pulse Width
•
Internally Fixed Threshold
2.3V, 2.6V, 2.9V, 3.1V, 4.4V, 4.6V
•
1.5% Voltage Threshold Tolerance
•
3 Pin SOT-23 Package
Part Number
SP809N
SP809
SP810
Output Type
Open Drain Active Low
Push-Pull Low
Push-Pull Active High
TYPICAL APPLICATION DIAGRAM
Fig. 1: SP809 / SP810 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
SP809 / SP810
3 Pin Microprocessor Supervisor Circuit
ABSOLUTE MAXIMUM RATINGS
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.
V
CC
.......................................................... -0.3V to 6.5V
RESET,
RESET
.................................... -0.3V to V
CC
+0.3V
Output Current (RESET,
RESET)
............................. 20mA
Power Dissipation (T
A
=70°C) .............................. 320mW
Junction Temperature .......................................... 125°C
Storage Temperature .............................. -65°C to 150°C
OPERATING RATINGS
Input Voltage Range V
CC
................................ 0.9V to 6V
Junction Temperature Range ..................... -40°C to 85°C
ELECTRICAL SPECIFICATIONS
Specifications with standard type are for an Operating Temperature of T
A
= 25°C only; limits applying over the full
Operating Temperature range are denoted by a “•”. Minimum and Maximum limits are guaranteed through test, design, or
statistical correlation. Typical values represent the most likely parametric norm at T
A
= 25°C, and are provided for reference
purposes only. Unless otherwise indicated, T
A
= 25°C.
Parameter
Operating Voltage Range V
CC
Supply Current I
CC
2.265
2.254
2.561
2.548
2.857
Reset Threshold V
TH
2.842
3.054
3.038
4.334
4.312
4.531
4.508
V
CC
Reset Delay V
TRIP
Reset Active Timeout Period T
RP
RESET Output Voltage V
OH
RESET Output Voltage V
OL
RESET
Output Voltage V
OH
RESET
Output Voltage V
OL
0.8V
CC
0.3
140
100
0.8V
CC
0.3
20
230
560
1030
4.6
4.4
3.1
2.9
2.6
Min.
0.9
1.0
2.3
Typ.
Max.
6.0
3.0
2.335
2.346
2.639
2.652
2.944
2.958
3.147
3.162
4.466
4.488
4.669
4.692
µs
ms
V
V
•
•
•
V
•
•
•
•
Units
V
µA
V
CC
=V
TH
+0.1V
T
A
=+25°C
T
A
=-40°C to 85°C
T
A
=+25°C
T
A
=-40°C to 85°C
T
A
=+25°C
T
A
=-40°C to 85°C
T
A
=+25°C
T
A
=-40°C to 85°C
T
A
=+25°C
T
A
=-40°C to 85°C
T
A
=+25°C
T
A
=-40°C to 85°C
V
CC
=V
TH
to (V
TH
+ 0.1V), V
TH
=3.1V
T
A
=+25°C
T
A
=-40°C to 85°C
V
CC
=V
TH
- 0.1V, I
SOURCE
= 1.2mA
V
CC
=V
TH
+ 0.1V, I
SINK
= 1.2mA
V
CC
=V
TH
+ 0.1V, I
SOURCE
= 1.2mA
V
CC
=V
TH
- 0.1V, I
SINK
= 1.2mA
Conditions
Note 1:
RESET
output is for SP809; RESET output is for SP810.
© 2011 Exar Corporation
2/8
Rev. 2.0.0
SP809 / SP810
3 Pin Microprocessor Supervisor Circuit
BLOCK DIAGRAM
Fig. 2: SP809 / SP810 Block Diagram
PIN ASSIGNMENT
Fig. 3: SP809 / SP810 Pin Assignment
PIN DESCRIPTION
Name
GND
RESET
2
RESET
V
CC
3
Pin Number
1
Ground Signal
Active Low Output Pin.
RESET
Output remains high while VCC is below the reset threshold
Active High Output Pin.
RESET Output remains high while VCC is below the reset threshold
Supply Voltage
Description
© 2011 Exar Corporation
3/8
Rev. 2.0.0
SP809 / SP810
3 Pin Microprocessor Supervisor Circuit
ORDERING INFORMATION
Part Number
SP809EK-L-2-3/TR
SP809EK-L-2-6/TR
SP809EK-L-2-9/TR
SP809EK-L-3-1/TR
SP809EK-L-4-6/TR
Temperature
Range
-40°C≤T
A
≤+85°C
-40°C≤T
A
≤+85°C
-40°C≤T
A
≤+85°C
-40°C≤T
A
≤+85°C
-40°C≤T
A
≤+85°C
Marking
N4WW
P4WW
Q4WW
R4WW
U4WW
V4WW
X4WW
Y4WW
C5WW
E5WW
J5WW
SOT23-3
2.5K/Tape & Reel Lead Free
Package
Packing
Quantity
Note 1
Note 2
SP809NEK-L-2-3/TR -40°C≤T
A
≤+85°C
SP809NEK-L-2-9/TR -40°C≤T
A
≤+85°C
SP809NEK-L-3-1/TR -40°C≤T
A
≤+85°C
SP809NEK-L-4-6/TR -40°C≤T
A
≤+85°C
SP810EK-L-2-6/TR
SP810EK-L-4-4/TR
-40°C≤T
A
≤+85°C
-40°C≤T
A
≤+85°C
“YY” = Year – “WW” = Work Week – “X” = Lot Number; when applicable.
© 2011 Exar Corporation
4/8
Rev. 2.0.0
SP809 / SP810
3 Pin Microprocessor Supervisor Circuit
TYPICAL PERFORMANCE CHARACTERISTICS
All data taken at T
A
= 25°C, unless otherwise specified - Schematic and BOM from Application Information section of this
datasheet.
Fig. 4: Supply Current versus Temperature
Fig. 5: Power-Down Reset Delay versus Temperature
Fig. 6: Power-Down Reset Delay versus Temperature
Fig. 7: Power-Down Reset Delay versus Temperature
Fig. 8: Normalized Reset Threshold versus Temperature
Fig. 9: Power-Up Reset Time-out versus Temperature
© 2011 Exar Corporation
5/8
Rev. 2.0.0
PCB设计
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