Power APE6809U-A 3pin microprocessor reset circuit Datasheet

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
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
APE6809/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
APE6809_6812 is available in a 3-pin SOT-23 and SC-70
package.
TYPICAL APPLICATION
VCC
VCC
VCC
Microprocessor
APE68XX
RESET
(RESET)
RESET
INPUT
GND
GND
PACKAGE / ORDERING INFORMATION
APE68XX X - X
Enable
09 : Active-Low
10 : Active-High
11 : Active-Low
12 : Active-High
(Top View)
(Top View)
Package
Voltage
U : SC-70
N : SOT-23
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
Data and specifications subject to change without notice
GND
RESET
(RESET)
1
APE6809
APE6810
RESET
(RESET)
APE6811
APE6812
3 VCC
GND
2
SOT-23/SC-70
1
3 VCC
2
SOT-23/SC-70
1
201102212
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
Thermal Resistance from Junction to case(RthJC)
o
110 C/W
Thermal Resistance from Junction to Ambient(Rth JA)Note
o
250 C/W
Note. RthJA is measured with the PCB copper area of approximately 1 in2(Multi-layer). that need connect to GND pin.
ELECTRICAL SPECIFICATIONS
(VDD=2.75V, TA=25℃, unless otherwise specified)
Parameter
Operating Vcc Range
Supply Current
Reset Threshold TA=25oC
Reset Threshold Tempco
MIN
1
TYP
-
MAX
6
UNITS
-
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
TA = 0 C to +85 C
-
50
-
ppm/oC
SYM
VRange
ICC
VTH
VTHT
TEST CONDITION
VCC = VTH+1.0V
o
o
V
V
Set-up Time
TS
VCC = 0 to (VTH – 100mV)
1
-
-
μs
Vcc to Reset Delay
TRD
Vcc=VTH to (VTH-100mV)
-
20
-
μs
160
200
260
ms
-
-
0.3
V
0.8 VCC
-
-
V
-
-
0.3
V
0.8 VCC
-
-
V
-
40
-
mV
Reset Active Timeout Period
RESET
Output Voltage
TDELAY
VOL
o
o
TA = 0 C to +85 C
1.8V<VCC < VTH(min), ISINK = 1.2mA
1.2V < VCC < 1.8V, ISINK = 50uA
(APE6809/APE6811)
VOH
VCC > VTH (max), ISOURCE = 500uA,
RESET
VOL
VCC > VTH (max), ISINK = 1.2mA,
Output Voltage
(APE6810/APE6812)
Hysteresis at VCC
VOH
VHys
1.8V < VCC < VTH (min), ISOURCE = 500uA
1.2V < VCC < 1.8V, ISOURCE = 150uA
Input voltage
2
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Electronics Corp.
APE6809_6812
PIN DESCRIPTIONS
PIN SYMBOL
VCC
PIN DESCRIPTION
Operating voltage input
GND
Ground
Reset output pin
RESET/(RESET)
L: for APE6809/APE6811
H: for APE6810/APE6812
BLOCK DIAGRAM
VCC
P-MOS
+
VREF
Delay
Circuit
RESET
/ RESET
N-MOS
GND
FUNCTION DESCRIPTION
A microprocessor’s (µP’s) reset input starts the µP in a known state. The
APE6809_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.
APPLICATION INFORMATION
Negative-Going VCC Transients
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 0.1µF bypass
capacitor mounted as close as possible to the VCC pin provides additional transient
immunity.
3
Advanced Power
Electronics Corp.
APE6809_6812
APPLICATION INFORMATION
Ensuring a Valid Reset Output Down to VCC = 0
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
APE6810/APE6812 if RESET is required to remain valid for VCC < 1.0V.
Ensuring a Valid Reset Output Down to VCC = 0
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.
4
Advanced Power
Electronics Corp.
APE6809_6812
TYPICAL PERFORMANCE CHARACTERISTICS
Temperature Vs Threshold Voltage
Temperature Vs Reset Active Timeout Period
Reset A ctive Tim eout P eriod (m s)
Threshold V oltage (V )
2.96
2.95
2.94
2.93
2.92
2.91
VTH=2.93V
2.9
-50
-25
0
25
50
75
250
240
230
220
210
200
190
180
170
160
150
100
-50
-25
0
Temperature (℃)
34
34
32
32
S upply Current (uA )
Reset A cS upply Current (uA )
50
75
100
Threshold Voltage Vs Supply Current
Temperature Vs Supply Current
30
28
26
24
22
30
28
26
24
22
VTH=2.93V
20
VCC=VTH+1V
20
-50
-25
0
25
50
75
100
2.25
2.63
Temperature (℃)
2.93
3.08
4
4.38
4.63
Threshold Voltage (V)
Temperature Vs Power-Down Reset Delay
Temperature Vs Power-Down Reset Delay
50
45
VTH=2.25V
40
VOD=VTH-VCC
Power-Down Reset Delay (uS)
50
Power-Down Reset Delay (uS)
25
Temperature (℃)
35
30
25
VOD=50mV
VOD=100mV
20
15
10
VOD=200mV
5
0
VTH=2.93V
45
VOD=VTH-VCC
40
35
VOD=50mV
30
25
20
15
VOD=200mV
VOD=100mV
10
5
0
-50
-25
0
25
50
Temperature (℃)
75
100
-50
-25
0
25
50
75
100
Temperature (℃)
5
Advanced Power
Electronics Corp.
APE6809_6812
TYPICAL PERFORMANCE CHARACTERISTICS
Temperature Vs Power-Down Reset Delay
Power-Down Reset Delay (uS)
100
90
VTH=4.63V
80
VOD=VTH-VCC
70
VOD=100mV
60
VOD=50mV
50
40
30
20
VOD=200mV
10
0
-50
-25
0
25
50
75
100
Temperature (℃)
TIMING DIAGRAM
Giltch Immunity
Maximum Transient
Duration(us)
3500
3000
2500
3000
2000
1500
1000
500
900
270
0
0
100
200
140
300
90
400
70
500
58
600
50
700
50
800
48
48
900 1000 1100
RESET COMPARATOR OVERDRIVE(mV)
6
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Electronics Corp.
APE6809_6812
MARKING INFORMATION
SOT-23
APPENDIX-1
Part Number
&&YWS
Part Number : && (see Appendix-1)
Week:
A~Z : 01~26
a~z : 27~52
ID Code : Internal
Year :
A = 2010
1 = 2011
:
:
SC-70
Identification
Identification
Code
Part Number
Code
APE6809N-A
CA
APE6811N-A
APE6809N-B
CB
APE6811N-B
CO
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
APPENDIX-2
Part Number
&YW
Part Number : & (see Appendix-2)
Week:
A~Z : 01~26
a~z : 27~52
Year :
A = 2010
1 = 2011
:
:
Identification
Identification
Code
Part Number
Code
APE6809U-A
a
APE6811U-A
APE6809U-B
b
APE6811U-B
o
p
APE6809U-C
c
APE6811U-C
q
APE6809U-D
d
APE6811U-D
r
APE6809U-E
e
APE6811U-E
s
APE6809U-F
f
APE6811U-F
t
APE6809U-G
g
APE6811U-G
u
APE6809U-H
3
APE6811U-H
7
APE6809U-I
4
APE6811U-I
8
APE6810U-A
h
APE6812U-A
v
APE6810U-B
i
APE6812U-B
w
APE6810U-C
j
APE6812U-C
x
APE6810U-D
k
APE6812U-D
y
APE6810U-E
l
APE6812U-E
z
APE6810U-F
m
APE6812U-F
1
APE6810U-G
n
APE6812U-G
2
APE6810U-H
5
APE6812U-H
9
APE6810U-I
6
APE6812U-I
0
7
Advanced Power
Electronics Corp.
APE6809_6812
PACKAGE OUTLINES
SOT-23-3L
D
E
E1
C
GAUGE PLANE
L
θ
L1
e1
VIEW C
A1
A
A2
e
SEE VIEW C
b
Symbol
A
A1
A2
b
C
D
E
E1
L
L1
e
e1
θ
Dimensions in Millimeters
Min.
Nom.
Max.
1.05
1.45
0.05
0.15
0.90
1.10
1.30
0.30
0.50
0.08
0.20
2.70
2.90
3.10
2.60
2.80
3.00
1.40
1.60
1.80
0.30
0.60
0.50
0.60
0.70
1.80
1.90
2.00
0.85
1.00
1.15
o
o
0
5
10o
Dimensions in Inches
Min.
Nom.
Max.
0.041
0.057
0.002
0.006
0.035
0.043
0.051
0.012
0.020
0.003
0.008
0.106
0.114
0.122
0.102
0.110
0.118
0.055
0.063
0.071
0.012
0.024
0.020
0.024
0.028
0.071
0.075
0.079
0.033
0.039
0.045
o
o
0
5
10o
Advanced Power
Electronics Corp.
APE6809_6812
SC-70-3L
Symbol
A
A1
A2
b
C
D
E
E1
e
L
L2
y
θ
θ
Dimensions in Millimeters
Min.
Nom.
Max.
0.80
1.10
0.00
0.10
0.70
0.90
1.00
0.25
0.40
0.08
0.22
1.80
2.00
2.20
1.95
2.10
2.25
1.15
1.25
1.35
1.30
0.26
0.36
0.46
0.15
0.10
0º
4º
8º
4º
12º
Dimensions in Inches
Min.
Nom.
Max.
0.031
0.043
0.000
0.004
0.280
0.035
0.039
0.010
0.016
0.003
0.009
0.071
0.079
0.087
0.077
0.083
0.089
0.045
0.049
0.053
0.051
0.010
0.014
0.018
0.006
0.004
0º
4º
8º
4º
12º
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