ACE ACE809 3-pin microprocessor reset circuit Datasheet

ACE809
Technology
3-Pin Microprocessor Reset Circuits
Description
The ACE809 microprocessor supervisory circuits can be used to monitor the power supplies in
microprocessor and digital systems. They provide s reset to the microprocessor during power-up,
power-down and brown-out conditions.
The function of the ACE809 is to monitor the VCC supply voltage, and assert a reset signal whenever this
voltage declines below the factory-programmed reset threshold. The reset signal remains asserted for
240ms after VCC rises above the threshold. The ACE809 has an active-low RESET output. The output of
the ACE809 is guaranteed valid down to VCC =1V. The device is available in a SOT-23-3L package.
The ACE809 is optimized to reject fast transient glitches on the VCC line. Low supply current of 25µA,
(VCC=3.3V) makes these devices suitable for battery powered applications.
Features
•
•
•
•
•
•
Precision Vcc Monitor for 3.0V,3.3V and 5.0V Supplies
140ms Guaranteed Minimum RESET Output Duration
RESET Output Guaranteed to Vcc=1.0V
Low 25μA Supply Current.
Vcc Transient Immunity.
No External Components.
Application
•
•
•
•
Embedded systems
Computers
Critical μP Power Supply Monitoring
Battery Powered equipment
Absolute Maximum Ratings
Parameter
Symbol
Max
Unit
Supply Voltage
VCC
5.5
V
Output Voltage
RESET -0.3 to (Vcc+0.3) V
Input Current
20
mA
Output Current
IOUT
20
mA
Power Dissipation
PD
Internally Limited
Thermal resistance junction to ambient
℃/W
230
SOT-23-3
θJA
Operating junction temperature range
TJ
0 to 125
℃
Storage temperature range
TSTG
-60 to 150
℃
Note 1: Exceeding these rating could cause damage to the device. All voltages are with respect to Ground. Currents are positive
into, negative out of the specified terminal.
Note 2: Voltage values are with respect to the anode terminal unless otherwise noted.
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ACE809
Technology
3-Pin Microprocessor Reset Circuits
Packaging Type
SOT-23-3
3
1
2
Pin No
1
Symbol
GND
2
RESET
3
Vcc
Description
Ground
RESET output remains low while Vcc is below the reset voltage threshold and for
240msec(typ.) after Vcc rises above reset threshold
Supply Voltage (typ.)
Ordering information
Selection Guide
ACE809
X XX +
H
Halogen - free
Pb - free
BM: SOT-23-3
Vout Volts :
L : 4.63V
M : 4.38V
J : 4.00V
T : 3.08V
S : 2.93V
R : 2.63V
Power Dissipation Table
Package
BM
TA≤ 25 OC
TA=70 OC
TA= 85 OC
θJA Df(mW/℃)
( C /W ) TA≧25℃ Power rating(mW) Power rating(mW) Power rating (mW)
230
3.5
543
348
283
O
Note:1.Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into
Thermal shutdown.
2.TJ: Junction Temperature Calculation TJ = TA + ( PD x θJA )
The θJA numbers are guidelines for the thermal performance of the device/PC-board system. All of the above assume no
Ambient airflow.
3.θJA : Thermal Resistance-Junction to Ambient, DF: Derating factor, Po: Power consumption
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ACE809
Technology
3-Pin Microprocessor Reset Circuits
Recommended Work Conditions
Item
Input Voltage (Vin)
Junction Temperature (TJ)
Min
2.0
Typ.
Max
5.5
0~125
Unit
V
℃
Electrical Characteristics
Parameter
Symbol
Input Voltage
Supply Current
Vcc
Icc
Reset Threshold
Reset Threshold Temperature Coefficient
(Note)
Vcc to Reset Delay Vcc=VTH to
(VTH-100mV)
Reset Active Timeout Period
RESET Output Voltage Low
RESET Output Voltage High
Typical
VTH
VOL
VOH
Test
Conditions
Min.
Typ. Max.
2.0
ACE809-4.63
ACE809-4.38
ACE809-4.00
ACE809-3.08
ACE809-2.93
ACE809-2.63
ISINK=3mA
ISOURCE=800uA
4.54
4.29
3.92
3.02
2.87
2.58
18
4.63
4.38
4.00
3.08
2.93
2.63
5.5
25
4.72
4.47
4.08
3.14
2.99
2.68
V
uA
V
30
ppm/
℃
20
usec
240
msec
V
V
0.4
0.8Vcc
Unit
Applications
Vcc
C=0.1uF
Vcc
ACE809
RESET
GND
Vcc
Processor
RESET Input
GND
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ACE809
Technology
3-Pin Microprocessor Reset Circuits
Typical Performance Characteristics
Supply Current VS. Temperature
Temperature (℃)
Power-Down Reset Delay VS. Temperature
Temperature (℃)
Normalized Threshold VS. Temperature
Temperature (℃)
Power-Up Reset Timeout VS. Temperature
Temperature (℃)
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ACE809
Technology
3-Pin Microprocessor Reset Circuits
Packing Information
SOT-23-3
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ACE809
Technology
3-Pin Microprocessor Reset Circuits
Notes
ACE does not assume any responsibility for use as critical components in life support devices or systems
without the express written approval of the president and general counsel of ACE Electronics Co., LTD.
As sued herein:
1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and shoes failure to perform when properly used in
accordance with instructions for use provided in the labeling, can be reasonably expected to result in
a significant injury to the user.
2. A critical component is any component of a life support device or system whose failure to perform can
be reasonably expected to cause the failure of the life support device or system, or to affect its safety
or effectiveness.
ACE Technology Co., LTD.
http://www.ace-ele.com/
VER 1.2
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