APX809-29SAG-7 Diodes Inc, APX809-29SAG-7 Datasheet - Page 4

• Manufacturer Part Number: APX809-29SAG-7
• Description: IC MPU RESET CIRC 2.93V SOT23-3
• Manufacturer: Diodes Inc
• Type: Simple Reset/Power-On Resetr

Specifications of APX809-29SAG-7

• Number Of Voltages Monitored: 1
• Output: Push-Pull, Totem Pole
• Reset: Active Low
• Reset Timeout: 140 ms Minimum
• Voltage - Threshold: 2.93V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-3, TO-236-3, Micro3™, SSD3, SST3
• Monitored Voltage: 2.5 V, 3 V, 3.3 V, 5 V
• Undervoltage Threshold: 2.86 V
• Overvoltage Threshold: 3 V
• Output Type: Active Low, Push-Pull
• Manual Reset: Not Resettable
• Watchdog: No Watchdog
• Battery Backup Switching: No Backup
• Power-up Reset Delay (typ): 200 ms
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1.1 V
• Supply Current (typ): 30 uA
• Maximum Power Dissipation: 400 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: APX809-29SAGDITR

Typical Application Circuit
Functional Description
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
declines below a preset threshold, keeping it asserted for at least
240ms after V
APX809/810 have a push-pull output stage.
Ensuring a Valid Reset Output
Down to V
exceeds the reset threshold, an internal timer keeps
low for the reset timeout period; after this interval,
goes high. If a brownout condition occurs (V
V
zero, and
V
low for the reset timeout period.
When V
longer sinks current—it becomes an open circuit. Therefore,
APX809/810 Rev. 4
RESET
RESET
CC
CC
goes below the reset threshold, the internal timer resets to
returns above the reset threshold, and
CC
CC
reset threshold),
is guaranteed to be a logic low for V
falls below 1V, the APX809
RESET
= 0
CC
has risen above the reset threshold. The
goes low. The internal timer starts after
100nF
RESET
C
IN
V
CC
goes low. Any time
APX8XX
RESET
RESET
CC
V
GND
CC
CC
CC
> 1V. Once V
supply voltage
dips below the
(RESET)
RESET
www.diodes.com
RESET
RESET
output no
remains
4 of 9
CC
3-PIN MICROPROCESSOR RESET CIRCUITS
high-impedance CMOS logic inputs connected to
drift to undetermined voltages.
This presents no problem in most applications since most µP and
other circuitry is inoperative with V
applications where
pull down resistor to
currents to flow to ground, holding
not critical; 100k are large enough not to load
small enough to pull
RESET
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.
is required to remain valid for V
INPUT
RESET
Microprocessor
V
RESET
GND
CC
RESET
RESET
must be valid down to 0V, adding a
APX809/810
to ground. For the APX810 if
RESET
causes any stray leakage
CC
below 1V. However, in
CC
FEBRUARY 2009
< 1V.
©
Diodes Incorporated
low. R1’s value is
RESET
RESET
and
can