Halogen and Antimony Free. “Green” Device (Note 3)
SOT23 (SR Package)
Applications
Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery Powered Equipment
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
A microprocessor’s (µP’s) reset input starts the µP in a known state. The APX809/810 assert reset to prevent code-execution errors during power-
up, power-down, or brownout conditions. They assert a reset signal whenever the V
CC
supply voltage declines below a preset threshold, keeping it
asserted for at least 240ms after V
CC
has risen above the reset threshold. The APX809/810 have a push-pull output stage.
Ensuring a Valid Reset Output
Down to V
CC
= 0
RESET
is guaranteed to be a logic low for V
CC
> 1V. Once V
CC
exceeds the reset threshold, an internal timer keeps
RESET
low for the
reset timeout period; after this interval,
RESET
goes high. If a brownout condition occurs (V
CC
dips below the
RESET
reset threshold),
RESET
remains low for the reset timeout period.
RESET
goes low. Any time V
CC
goes below the reset threshold, the internal timer resets to zero, and
RESET
goes low. The internal timer
starts after V
CC
returns above the reset threshold, and
When V
CC
falls below 1V, the APX809
CMOS logic inputs connected to
RESET
output no longer sinks current — it becomes an open circuit. Therefore, high-impedance
RESET
can drift to undetermined voltages.
This presents no problem in most applications since most µP and other circuitry is inoperative with V
CC
below 1V. However, in applications where
RESET
must be valid down to 0V, adding a pull down resistor to
RESET
causes any stray leakage currents to flow to ground, holding
RESET
low. R1’s value is not critical; 100k are large enough not to load
RESET
and small enough to pull
RESET
to ground. For the
APX810 if
RESET
is required to remain valid for V
CC
< 1V.
Benefits of Highly Accurate Reset Threshold
Most µP supervisor ICs has reset threshold voltages between 5% and 10% below the value of nominal supply voltages. This ensures a reset will
not occur within 5% of the nominal supply, but will occur when the supply is 10% below nominal. When using ICs rated at only the nominal supply
±5%, this leaves a zone of uncertainty where the supply is between 5% and 10% low, and where the reset may or may not be asserted.
Ordering Information
APX 8 XX - XX XX G - 7
Enable
09 : Active-Low
10 : 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
SA/SR : SOT23
Green
G : Green
Packing
7 : Tape & Reel
Part Number
APX809-XXSAG-7
APX810-XXSAG-7
APX809-XXSRG-7
APX810-XXSRG-7
Note:
Package Code
SA
SA
SR
SR
Packaging
(Note 5)
SOT23
SOT23
SOT23
SOT23
7” Tape and Reel
Quantity
3000/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
3000/Tape & Reel
Part Number Suffix
-7
-7
-7
-7
5. Pad layout as shown in Diodes Incorporated’s package outline PDFs, which can be found on our website at http://www.diodes.com/package-outlines.html.
Monitoring chip type: Simple Reset/Power-On Reset Voltage threshold: 3.08V Number of monitoring voltage groups: 1 Output structure: Push-Pull, Totem Pole Effective reset level: Active Low MCU reset IC
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