APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
Features
•
•
•
•
•
•
•
•
•
Precision Monitor of(2.5V/3.0V/3.3V/5.0V) power
supply voltage
Full specified over temperature
Manual reset input
Available in four output configuration
Push-pull
RESET
Active low(APX811)
Push-pull RESET Active high(APX812)
Power-on reset generator with fixed delay time 200ms
SOT143: Available in “Green” Molding Compound
(No Br, Sb)
Lead Free Finish/RoHS Compliant (Note 1)
General Description
The APX811/812 are used for microprocessor supervisory circuit
to monitor the power supplies in These circuit perform a single
function: they assert a reset signal whenever the Vcc supply
voltage declines below a preset threshold, keeping it asserted for
at least 240ms after Vcc has risen above the reset threshold.
Reset thresholds suitable for operation with a variety of supply
voltages are available. The APX811/812 have push-pull outputs.
The APX811 has an active low
RESET
output, while the
APX812 has an active high RESET output.
The APX811/812 devices incorporate a manual reset input,
MR
.
A low level at
MR
causes RESET to become active.
The APX811/2 are targeted at 2.5V, 3V, 3.3V and 5V powered
systems and are available with different threshold voltages to
meet the exact needs of the system. They are available in the
space saving SOT143 package and operate over the whole
industrial temperature range, -40 to 85°C.
Applications
•
•
•
•
•
•
Computers
Controllers
Intelligent Instruments
Critical uP and UC power Monitoring
Portable/Battery powered Equipment
Automotive
Typical Application Circuit
Vcc
Vcc
Vcc
APX811/APX812
MR
(Manual Reset)
Push Botton
GND
RESET
(RESET)
MCU
RESET Input
GND
APX811/812 Rev. 2
DS31960
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Diodes Incorporated
APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
Ordering Information
APX 8 XX - XX U G - 7
Enable
11 : Active-Low
12 : Active-High
Voltage
46
44
40
31
29
26
23
: 4.63
: 4.38
: 4.00
: 3.08
: 2.93
: 2.63
: 2.25
Package
U : SOT143
Green
G : Green
Packing
7 : Tape & Reel
Device
APX811-XXUG-7
APX812-XXUG-7
Notes:
Package
Code
U
U
Packaging
(Note 2)
SOT143
SOT143
7” Tape and Reel
Quantity
Part Number Suffix
3000/Tape & Reel
3000/Tape & Reel
-7
-7
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
Pin Assignments
( Top View )
1
4
Vcc
GND
RESET (RESET)
2
SOT143
3
MR
Pin Descriptions
Pin Name
GND
RESET
(RESET)
VCC
MR
Description
Ground
Reset output Pin
L: for APX811
H: for APX812
Operating Voltage Input
Manual reset (Active Low)
APX811/812 Rev. 2
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APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
Block Diagram
Vcc
Vref
Driver
Delay Circuit
RESET
MR
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
ESD HBM Human Body Model ESD protection
ESD MM
V
CC
V
RESET
I
CC
I
O
P
D
Machine Model ESD Protection
Supply voltage
RESET
Input Current, Vcc
Output current
Power dissipation
3
500
-0.3~7
-0.3 to (Vcc+0.3)
20
20
320
kV
V
V
V
mA
mA
mW
Recommended Operating Conditions
Symbol
V
CC
V
IN
T
A
Parameter
Min
1.1
0
-40
Max
5.5
(V
CC
+0.3)
85
Unit
V
V
o
C
Supply Voltage
Input Voltage
Operating Ambient Temperature
APX811/812 Rev. 2
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APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
Electrical Characteristics
(T
A
= 25ºC)
T
A
= -40 to 85
o
C unless otherwise note. Typical values are at T
A
=+25
o
C.
Symbol
Parameter
Test Conditions
V
CC
V
CC
Range
I
CC
Supply Current
V
th
+ 0.2V
Min
1.0
Typ.
30
2.22
2.59
2.89
2.25
2.63
2.93
3.08
4.00
4.38
4.63
20
Max
5.5
40
Unit
V
µA
2.28
2.67
2.98
3.13
4.06
4.45
4.70
0.3
0.4
0.3
V
V
V
V
V
V
V
µs
V
V
th
Reset threshold
T
A
=
25
o
C.
3.03
3.94
4.31
4.56
t
s
V
OL
V
OH
V
OL
V
OH
θ
JA
θ
JC
Notes:
V
CC
= V
th
to (V
th
– 100mV)
V
CC
= V
th
-0.2, I
SINK
= 1.2mA
RESET
Output Voltage Low
V
CC
= V
th
-0.2, I
SINK
= 3.2mA
(APX811)
V
CC
> 1.0V, I
SINK
= 50uA
V
CC
> V
th
+0.2,
RESET Output Voltage-High I
SOURCE
= 500uA
(APX811)
V
CC
> V
th
+0.2,
I
SOURCE
= 800uA
V
CC
= V
th
+0.2, I
SINK
= 1.2mA
RESET Output Voltage-Low
(APX812)
V
CC
= V
th
+0.2, I
SINK
= 3.2mA
RESET Output Voltage-High 1.8V < V
CC
< V
th
-0.2,
(APX812)
I
SOURCE
= 150uA
Thermal Resistance
SOT143 (Note 3)
Junction-to-Ambient
Thermal Resistance
SOT143 (Note 3)
Junction-to-Case
Set-up Time
0.8V
CC
V
V
CC
–1.5
0.3
0.4
0.8 V
CC
240
71
o
V
V
C/W
C/W
o
3. Test condition for SOT143: Device mounted on FR-4 substrate, 1"*1", 2oz, copper, single-sided, PC boards.
Timing requirements
Symbol
Parameter
(T
A
=25
o
C)
Test Conditions
Min Typ. Max Unit
t
W
Pulse Width
at MR
V
CC
> V
th
-
+0.2V, V
IL
=0.3
×
V
CC
, V
IH
=0.7
×
V
CC
100
-
-
ns
APX811/812 Rev. 2
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APX811/812
4-Pin Microprocessor Supervisor With Manual Reset
Switching Characteristics
Symbol
(T
A
=25
o
C)
Parameter
Test Conditions
Min Typ. Max Unit
t
d
Delay Time
APX811/812
t
PHL
MR to
RESET
Propagation (Delay) Time, delay (APX811/812)
High-to-low-level Output
V
CC
to
RESET
delay
MR
to RESET delay
Propagation (Delay) Time, (APX811/812)
Low-to-high-level Output
V
CC
to RESET delay
(APX811/812)
t
PLH
V
CC
> V
th
-
+0.2V,
See timing diagram
V
CC
> V
th
-
+0.2V,
V
IL
=0.3
×
V
CC
,
V
IH
=0.7
×
V
CC
V
IL
= V
th
-
-0.2V,
V
IH
= V
th
-
+0.2V
V
CC
> V
th
-
+0.2V,
V
IL
=0.3
×
V
CC
,
V
IH
=0.7
×
V
CC
V
IL
= V
th
-
-0.2V,
V
IH
= V
th
-
+0.2V
140
-
-
-
-
200
-
-
-
-
280
0.1
25
0.1
25
ms
µs
µs
µs
µs
Timing Diagram
RESET vs. Vcc Timing Diagram
Vth
Vcc
Vth
t
d
t
d
/RESET
Vth
t
d
t
d
RESET
RESET vs. /MR Timing Diagram
Vth
Vcc
/MR
t
d
/RESET
t
d
APX811/812 Rev. 2
DS31960
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OCTOBER 2009
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Diodes Incorporated
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