Advanced Power
Electronics Corp. APE6809_6812
3PIN MICROPROCESSOR RESET CIRCUIT
FEATURES DESCRIPTION
Precision Monitoring of +2.5,+3V, +3.3V,
and +5V Power-Supply Voltages
Fully Specified Over Temperature
Available in Three Output Configurations
Push-Pull RESET Low Output(APE6809/APE6811)
Push-Pull RESET High Output(APE6810/APE6812)
200ms (Typ.)min Power-On Reset Pulse Width
25µA Supply Current
Guaranteed Reset Valid to VCC = +1.0V
Power Supply Transient Immunity
No External Components
Available in the 3-Pin Pb-Free SOT-23
and SC-70 Package
Halogen-Free Product
Data and specifications subject to change without notice
200905251
TYPICAL APPLICATION
PACKAGE ORDERING INFORMATION
1
The APE6809_6812 are used for microprocessor (µP)
supervisory circuits to monitor the power supplies in µP and
digital systems. They provide excellent circuit reliability and
low cost by eliminating external components and
adjustments when used with +5V, +3.3V, +3.0V, +2.5V
powered circuits.
These circuits 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 200ms after
VCC has risen above the reset threshold. Reset thresholds
suitable for operation with a variety of supply voltages are
available. The APE6809_6812 have push pull outputs. The
A
PE6809/APE6811 have an active low RESET output, while
the APE6810_6812 has an active high RESET output. The
reset comparator is designed to ignore fast transients on
VCC, and the outputs are guaranteed to be in the correct
logic state for VCC down to 1.0V. Low supply current makes
the APE6809_6812 ideal for use in portable equipment. The
A
PE6809_6812 is available in a 3-pin SOT-23 and SC-70
package.
(Top View)
1
2
GND
VCC
SOT-23/SC-70
APE6809
APE6810
2
3
(Top View)
1
2
GND
VCC
SOT-23/SC-70
APE6811
APE6812
2
3
(RESET)
RESET
(RESET)
RESET
APE68XX
GND
RESET
(RESET)
VCC Microprocessor
VCC
GND
RESET
INPUT
VCC
APE68XX X - X - HF
Enable
09 : Active-Low
10 : Active-High A: 4.63
B: 4.38
C: 4.00
D: 3.08
E: 2.93
F: 2.63
G: 2.25
H: 2.70
I : 4.25
Package
N : SOT-23
U : SC-70
11 : Active-Low
12 : Active-High
Voltage Halogen-Free
Advanced Power
Electronics Corp. APE6809_6812
MARKING INFORMATION
APPENDIX
2
Pa rt Number Identification
Co d e P art Nu m b er Identification
Code
APE6809N-A CA APE6811N-A CO
APE6809N-B CB APE6811N-B CP
APE6809N-C CC APE6811N-C CQ
APE6809N-D CD APE6811N-D CR
APE6809N-E CE APE6811N-E CS
APE6809N-F CF APE6811N-F CT
APE6809N-G CG APE6811N-G CU
APE6809N-H Ca APE6811N-H Cf
APE6809N-I Cb APE6811N-I Cg
APE6810N-A CH APE6812N-A C1
APE6810N-B CI APE6812N-B C2
APE6810N-C CJ APE6812N-C C3
APE6810N-D CK APE6812N-D C4
APE6810N-E CL APE6812N-E C5
APE6810N-F CM APE6812N-F C6
APE6810N-G CN APE6812N-G C7
APE6810N-H Cd APE6812N-H Ch
APE6810N-I Ce APE6812N-I Cm
APE6809U-A CA APE6811U-A CO
APE6809U-B CB APE6811U-B CP
APE6809U-C CC APE6811U-C CQ
APE6809U-D CD APE6811U-D CR
APE6809U-E CE APE6811U-E CS
APE6809U-F CF APE6811U-F CT
APE6809U-G CG APE6811U-G CU
APE6809U-H Ca APE6811U-H Cf
APE6809U-I Cb APE6811U-I Cg
APE6810U-A CH APE6812U-A C1
APE6810U-B CI APE6812U-B C2
APE6810U-C CJ APE6812U-C C3
APE6810U-D CK APE6812U-D C4
APE6810U-E CL APE6812U-E C5
APE6810U-F CM APE6812U-F C6
APE6810U-G CN APE6812U-G C7
APE6810U-H Cd APE6812U-H Ch
APE6810U-I Ce APE6812U-I Cm
XXYW
Part number : Identification Code
WW : 01~26(A~Z)
27~52(a~z)
Year : 7 = 2007
A = 2010
Advanced Power
Electronics Corp. APE6809_6812
ABSOLUTE MAXIMUM RATINGS (at TA=25°C)
VCC PIN Voltage (VCC) ----------------------------------
-
GND - 0.3V to GND + 6.5V
RESET, RESET(Push-Pull) PIN Voltage (VRESET) -
-
GND - 0.3V to VCC + 0.3V
Input Current, VCC (ICC) ----------------------------------- 20mA
Output Current, RESET, RESET (IO) -----------------
-
5mA
Power Dissipation(PD) ------------------------------------
-
( TJ-TA ) / Rthja
Storage Temperature Range(TST) --------------------- -60°C To 150°C
Operating Temperature Range(TOP) ------------------ -40°C To 85°C
Junction Temperature(TJ) -------------------------------
-
-40°C To 150°C
110oC/W
250oC/W
Note. RthJA is measured with the PCB copper area of approximately 1 in2(Multi-layer). that need connect to VSS pin.
ELECTRICAL SPECIFICATIONS
(VDD=2.75V, TA=25℃, unless otherwise specified)
Parameter SYM TEST CONDITION MIN TYP MAX UNITS
Operating Vcc Range VRange 1-6V
Supply Current ICC VCC = VTH+1.0V - 25 35 µA
APE6809_6812A 4.54 4.63 4.71
APE6809_6812B 4.29 4.38 4.46
APE6809_6812I 4.16 4.25 4.33
APE6809_6812C 3.92 4 4.08
APE6809_6812D 3.02 3.08 3.15
APE6809_6812E 2.87 2.93 3
APE6809_6812H 2.64 2.7 2.75
APE6809_6812F 2.57 2.63 2.69
APE6809_6812G 2.2 2.25 2.3
Reset Threshold Tempco VTHT TA = 0oC to +85oC - 50 - ppm/oC
Set-up Time TSVCC = 0 to (VTH – 100mV) 1 - - µs
Vcc to Reset Delay TRD Vcc=VTH to (VTH-100mV) - 20 - µs
Reset Active Timeout Period TDELAY TA = 0oC to +85oC 160 200 260 ms
RESET 1.8V<VCC < VTH(min), ISINK = 1.2mA
Output Voltage 1.2V < VCC < 1.8V, ISINK = 50uA
(APE6809/APE6811) VOH VCC > VTH (max), ISOURCE = 500uA, 0.8VCC -- V
RESET VOL VCC > VTH (max), ISINK = 1.2mA, - - 0.3 V
Output Voltage 1.8V < VCC < VTH (min), ISOURCE = 500uA
(APE6810/APE6812) 1.2V < VCC < 1.8V, ISOURCE = 150uA
Hysteresis at VCC VHys Input voltage - 40 - mV
3
Thermal Resistance from Junction to case(RthJC)
Thermal Resistance from Junction to Ambient(RthJA)
VTH V
VOL
V
Reset Threshold TA=25oC
VOH 0.8 VCC --
- - 0.3 V
Advanced Power
Electronics Corp. APE6809_6812
PIN DESCRIPTIONS
PIN SYMBOL PIN DESCRIPTION
VCC Operating voltage input
GND Ground
Reset output pin
L: for APE6809/APE6811
H: for APE6810/APE6812
BLOCK DIAGRAM
FUNCTION DESCRIPTION
APPLICATION INFORMATION
Negative-Going VCC Transients
4
RESET/(RESET)
VREF
Delay
Circuit RESET
/ RESET
GND
VCC
+
-
P-MOS
N-MOS
A microprocessor’s (µP’s) reset input starts the µP in a known state. The
A
PE6809_6812 asserts reset to prevent code-execution errors during power-up,
power-down, or brownout conditions. They assert a reset signal whenever the VCC
supply voltage declines below a preset threshold, keeping it asserted for at least
200ms after VCC has risen above the reset threshold. The APE6809_6812 has a
push-pull output stage.
In addition to issuing a reset to the µP during power-up, power-down, and
brownout conditions, the APE6809_6812 is relatively immune to short-duration
negative-going VCC transients (glitches).
The APE6809_6812 does not generate a reset pulse. The graph was generated
using a negative going pulse applied to VCC, starting 0.5V above the actual reset
threshold and ending below it by the magnitude indicated (reset comparator
overdrive). The graph indicates the maximum pulse width a negative going VCC
transient can have without causing a reset pulse. As the magnitude of the transient
increases (goes farther below the reset threshold), the maximum allowable pulse width
decreases. Typically, a VCC transient that goes 50mV below the reset threshold A 0.1
µF bypass capacitor mounted as close as possible to the VCC pin provides additional
transient immunity.
Advanced Power
Electronics Corp. APE6809_6812
APPLICATION INFORMATION
Ensuring a Valid Reset Output Down to VCC = 0
Ensuring a Valid Reset Output Down to VCC = 0
5
RESET is guaranteed to be a logic low for VCC > 1.0V. Once VCC 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 (VCC dips below the
reset threshold), RESET goes low. Any time VCC goes below the reset threshold, the
internal timer resets to zero, and RESET goes low. The internal timer starts after VCC
returns above the reset threshold, and RESET remains low for the reset timeout
period.
When VCC falls below 1.0V, the APE6809/APE6811 RESET output no longer sinks
current—it becomes an open circuit. Therefore, high-impedance CMOS logic inputs
connected to RESET can drift to undetermined voltages.
This presents no problem in most applications since most µP and other circuitry is
inoperative with VCC below 1.0V. However, in applications where RESET must be
valid down to 0V, adding a pull down resistor to causes any stray leakage currents to
flow to ground, holding RESET low. R1’s value is not critical; 100k is large enough not
to load RESET and small enough to pull RESET to ground. For the
PE6810/APE6812 if RESET is required to remain valid for VCC < 1.0V.
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.
Advanced Power
Electronics Corp. APE6809_6812
TYPICAL PERFORMANCE CHARACTERISTICS
6
2.9
2.91
2.92
2.93
2.94
2.95
2.96
-50 -25 0 25 50 75 100
Threshold Voltage (V)
Temperature (℃)
Temperature Vs Threshold Voltage
VTH=2.93V
150
160
170
180
190
200
210
220
230
240
250
-50 -25 0 25 50 75 100
Reset Active Timeout Period (ms)
Temperature (℃)
Temperature Vs Reset Active Timeout Period
20
22
24
26
28
30
32
34
-50 -25 0 25 50 75 100
Reset AcSupply Current (uA)
Temperature (℃)
Temperature Vs Supply Current
V
TH
=2.93V
20
22
24
26
28
30
32
34
2.25 2.63 2.93 3.08 4 4.38 4.63
Supply Current (uA)
Threshold Voltage (V)
Threshold Voltage Vs Supply Current
V
CC
=V
TH
+1V
0
5
10
15
20
25
30
35
40
45
50
-50-250 255075100
Temperature Vs Power-Down Reset Delay
Power-Down Reset Delay (uS)
Temperature (℃)
V
TH
=2.25V
V
OD
=V
TH
-V
CC
V
OD
=50mV V
OD
=100mV
V
OD
=200mV
0
5
10
15
20
25
30
35
40
45
50
-50 -25 0 25 50 75 100
Temperature Vs Power-Down Reset Delay
Power-Down Reset Delay (uS)
Temperature (℃)
V
TH
=2.93V
V
OD
=V
TH
-V
CC
V
OD
=100mV
V
OD
=50mV
V
OD
=200mV
Advanced Power
Electronics Corp. APE6809_6812
TYPICAL PERFORMANCE CHARACTERISTICS
TIMING DIAGRAM
7
0
10
20
30
40
50
60
70
80
90
100
-50 -25 0 25 50 75 100
Temperature Vs Power-Down Reset Delay
Power-Down Reset Delay (uS)
Temperature (℃)
V
TH
=4.63V
V
OD
=V
TH
-V
CC
V
OD
=50mV
V
OD
=200mV
V
OD
=100mV
Giltch Immunity
3000
900
270 140 90 70 58 50 50 48 48
0
500
1000
1500
2000
2500
3000
3500
0 100 200 300 400 500 600 700 800 900 1000 1100
RESET COMPARATOR OVERDRIVE(mV)
Maximum Transient
Duration(us)
PACKAGE OUTLINE
(1) Package Type: SOT-23
L
e
E
HE
D
A2
A1
b(3x)
A
VIEW C
L1
1(4x)
2(4x)
e1
GAUGE PLANE
C
SEE VIEW C
θ
θ
θ
Dimensions In Millimeters Dimensions In Inches
Symbol Min. Nom. Min. Nom.
A 1.05 - A 1.05 - A
A1 0.05 - A1 0.05 - A1
A2 1.00 1.10 A2 1.00 1.10 A2
b 0.25 - b 0.25 - b
C 0.08 - C 0.08 - C
D 2.70 2.90 D 2.70 2.90 D
E 1.50 1.60 E 1.50 1.60 E
HE 2.60 2.80 HE 2.60 2.80 HE
L 0.30 - L 0.30 - L
L1 0.50 0.60 L1 0.50 0.60 L1
e 1.80 1.90 e 1.80 1.90 e
e1 0.85 0.95 e1 0.85 0.95 e1
θ 0
o 5
o θ 0
o 5
o θ
θ1 3o 5
o θ1 3o 5
o θ1
θ2 6o 8
o θ2 6o 8
o θ2
Electronics Corp.
Advanced Power APE6809_6812
(2) Package Type: SC-70
e
E
HE
b
D
A
A1
Dimensions In Millimeters Dimensions In Inches
Symbol Min. Nom. Max. Min. Nom. Max.
A 0.80 0.95 1.10 0.032 0.039 0.043
A1 0.02 0.06 0.10 0.001 0.0025 0.004
D 1.80 2.00 2.20 0.070 0.079 0.087
HE 1.80 2.20 2.40 0.070 0.087 0.094
E 1.15 1.25 1.35 0.045 0.049 0.053
b 0.20 0.30 0.40 0.008 0.012 0.016
e 0.65 Bsc. 0.026 Bsc.
Electronics Corp.
Advanced Power APE6809_6812