AP1701/2/3/4
NOT RECOMMENDED FOR NEW
DESIGN, USE (APX809/810)
3-PIN MICROPROCESSOR RESET CIRCUITS
AP1701/2/3/4 Rev. 2 1 of 10 JANUARY 2007
www.diodes.com © Diodes Incorporated
AP170 X
X
X
X
X
Voltage Package Packing
A:4.63
B:4.38
C:4.00
D:3.08
E:2.93
F:2.63
G:2.25
W : SC59 -7 : Taping
Enable
1 : Active-Low
2:Active-High
3 : Active-Low
4:Active-High
Lead Free
L : Lead Free
G:Green
SA : SOT23
Features General Description
The AP1701/2/3/4 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 powered circuits.
• Precision Monitoring of +2.5V, +3V, +3.3V, and +5V
Power-Supply Voltages
• Fully Specified Over Temperature
• Available in three Output Configurations
• Push-PullRESET Low Output (AP1701/3)
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 240ms after VCC has
risen above the reset threshold. Reset thresholds suitable for
operation with a variety of supply voltages are available. The
AP1701/2/3/4 have push pull outputs. The AP1701/3 have an
active low RESET output, while the AP1702/4 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 1V. Low supply current
makes the AP1701/2/3/4 ideal for use in portable equipment. The
AP1701/2/3/4 is available in a 3-pin SC59 package.
• Push-Pull RESET High Output (AP1702/4)
• 200ms Min. Power-On Reset Pulse Width
• 20µA Supply Current (Typ.)
• Guaranteed Reset Valid to VCC = +1V
• Power Supply Transient Immunity
• No External Components
• Green Packages: SC59-3L and SOT23
• Lead Free Finish / RoHS Compliant (Note 1)
Applications
• Computers
• Controllers
• Intelligent Instruments
• Critical µP and µC Power Monitoring
• Portable/Battery Powered Equipment
• Automotive
Ordering Information
Notes: 1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.
7” Tape and Reel
Device Package
Code Packaging
(Note 2) Quantity Part Number Suffix
AP170XXW W SC59 3000/Tape & Reel -7
AP170XXSA SA SOT23 3000/Tape & Reel -7
Notes: 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
AP1701/2/3/4
NOT RECOMMENDED FOR NEW
DESIGN, USE (APX809/810)
3-PIN MICROPROCESSOR RESET CIRCUITS
AP1701/2/3/4 Rev. 2 2 of 10 JANUARY 2007
www.diodes.com © Diodes Incorporated
(Top View)
1
2
GND
VCC
AP1703
AP1704
2
3
(RESET)RESET
(Top View)
1
2
GND
(RESET)
VCC
AP1701
AP1702
2
3
RESET
SC59-3L SC59-3L
Pin Assignments
SOT23
ANODE 1
2 CATHODE
3REF
Pin Descriptions
Name Description
GND Ground
RESET
(RESET)
Reset Output Pin
L: for AP1701/3
H: for AP1702/4
VCC Operating Voltage Input
AP1701/2/3/4
NOT RECOMMENDED FOR NEW
DESIGN, USE (APX809/810)
3-PIN MICROPROCESSOR RESET CIRCUITS
AP1701/2/3/4 Rev. 2 3 of 10 JANUARY 2007
www.diodes.com © Diodes Incorporated
Absolute Maximum Ratings
Symbol Parameter Rating Unit
VCC Terminal Voltage (with respect to GND) -0.3 to +6.0 V
VRESET RESET, RESET (push-pull) -0.3 to (VCC + 0.3) V
ICC Input Current, VCC 20 mA
IO Output Current, RESET, RESET 20 mA
PD Continuous Power Dissipation (TA = +70°C),
de-rate 4mW/°C above +70°C 320 mW
TOP Operating Junction Temperature Range -40 to +105 °C
TST Storage Temperature Range -65 to +150 °C
Electrical Characteristics (TA = 25ºC)
Symbol Parameter Conditions Min. Typ. Max. Unit
VCC V
CC Range TA = 0oC to +70oC 1.0 5.5 V
ICC Supply Current VTH + 1.0V 20 30 μA
AP1701/2/3/4A 4.54 4.63 4.72
AP1701/2/3/4B 4.29 4.38 4.47
AP1701/2/3/4C 3.92 4.00 4.08
AP1701/2/3/4D 3.02 3.08 3.14
AP1701/2/3/4E 2.87 2.93 2.99
AP1701/2/3/4F 2.57 2.63 2.68
Reset Threshold
TA = 25ºC
AP1701/2/3/4G 2.20 2.25
V
2.30
VTH
Reset Threshold
Tempco 30
ppm/
oC
TS Set-up Time VCC = 0 to (VTH – 100mV) 100 μs
TDELAY Reset Active
Timeout Period TA = 0oC to +70oC 100 240 600 ms
VCC = VTH min, ISINK = 1.2mA, AP1701/3 0.3
VCC = VTH min, ISINK = 3.2mA 0.4
TRESE Output
Voltage Low VCC > 1.0V, ISINK = 50uA V VOL 0.3
VCC > VTH max, ISOURCE = 500uA, AP1701/3 0.8VCC
VOH TRESE Output
Voltage-High VCC > VTH max, ISOURCE = 800uA VCC –1.5 V
VCC = VTH max, ISINK = 1.2mA, AP1702/4 0.3
VOL RESET Output
Voltage-Low VCC = VTH max, ISINK = 3.2mA V
0.4
VOH RESET Output
Voltage-High 1.8V < VCC < VTH min, ISOURCE = 150uA,
AP1702/4 0.8 VCC V
AP1701/2/3/4
NOT RECOMMENDED FOR NEW
DESIGN, USE (APX809/810)
3-PIN MICROPROCESSOR RESET CIRCUITS
AP1701/2/3/4 Rev. 2 4 of 10 JANUARY 2007
www.diodes.com © Diodes Incorporated
Typical Application Circuit
AP170X
GND
RESET
(RESET)
VCC
Microprocessor
VCC
GND
RESET
INPUT
VCC
Cin
0.1uF
Function Description
A microprocessor’s (µP’s) reset input starts the µP in a
known state. The AP1701/2/3/4 assert 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 240ms after VCC has risen above the reset
threshold. The AP1701/2/3/4 have a push-pull output stage.
Applications Information
Negative-Going V CC Transients
In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, the AP1701/2/3/4 are
relatively immune to short-duration negative-going VCC transients
(glitches).
The AP1701/2/3/4 do 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 V CC
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 100mV below the reset
threshold and lasts 100µs or less will not cause a reset pulse. A
0.1µF bypass capacitor mounted as close as possible to the VCC
pin provides additional transient immunity.
Ensuring a Valid Reset Output
Down to VCC = 0
RESET is guaranteed to be a logic low for VCC > 1V.
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 1V, the AP1701/3 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 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 AP1702/4 if
RESET is required to remain valid for VCC < 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.
RESET
AP1701/2/3/4
NOT RECOMMENDED FOR NEW
DESIGN, USE (APX809/810)
3-PIN MICROPROCESSOR RESET CIRCUITS
AP1701/2/3/4 Rev. 2 5 of 10 JANUARY 2007
www.diodes.com © Diodes Incorporated
Block Diagram
V
REF
Delay Circuit Driver RESET
/ RESET
Performance Characteristics
-50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120
Iq
24
20
16
12
8
4
0
Temp ( C )
Iq vs. Temp
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
Threshold
Temp
2.92
2.922
2.924
2.926
2.928
Threshold vs. Temp
AP1701/2/3/4
NOT RECOMMENDED FOR NEW
DESIGN, USE (APX809/810)
3-PIN MICROPROCESSOR RESET CIRCUITS
AP1701/2/3/4 Rev. 2 6 of 10 JANUARY 2007
www.diodes.com © Diodes Incorporated
Timing Diagram
VTH
TS
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)
TDELAY
VCC
TDELAY
Active Low
Active High TDELAY T
DELAY
AP1701/2/3/4
NOT RECOMMENDED FOR NEW
DESIGN, USE (APX809/810)
3-PIN MICROPROCESSOR RESET CIRCUITS
AP1701/2/3/4 Rev. 2 7 of 10 JANUARY 2007
www.diodes.com © Diodes Incorporated
Marking Information
(1) SC59-3L
1 2
3
XX Y M X
(Top View)
XX : Identification code
Y : Year 0-9
M: Month A~L
L : Lead Free Package
G : Green Package
(2) SOT23
:
(Top View)
XX
Y
M
X
Marking Code
YYear
M: Month (A~L)
X : L : Lead Free
G :Green
AP1701/2/3/4
3-PIN MICROPROCESSOR RESET CIRCUITS
AP1701/2/3/4 Rev. 2 8 of 10 JANUARY 2007
www.diodes.com © Diodes Incorporated
NOT RECOMMENDED FOR NEW
DESIGN, USE (APX809/810)
Marking Information (Continued)
Device Package (Note 3) Identification Code
AP1701ASA SOT23
AP1701BSA SOT23
AP1701CSA SOT23
AP1701DSA SOT23
AP1701ESA SOT23
AP1701FSA SOT23
AP1701GSA SOT23
AP1702ASA SOT23
AP1702BSA SOT23
AP1702CSA SOT23
AP1702DSA SOT23
AP1702ESA SOT23
AP1702FSA SOT23
AP1702GSA SOT23
AP1703ASA SOT23
AP1703BSA SOT23
AP1703CSA SOT23
AP1703DSA SOT23
AP1703ESA SOT23
AP1703FSA SOT23
AP1703GSA SOT23
AP1704ASA SOT23
AP1704BSA SOT23
AP1704CSA SOT23
AP1704DSA SOT23
AP1704ESA SOT23
AP1704FSA SOT23
AP1704GSA SOT23
AP1701AW SC59 EA
AP1701BW SC59 EB
AP1701CW SC59 EC
AP1701DW SC59 ED
AP1701EW SC59 EE
AP1701FW SC59 EF
AP1701GW SC59 W1
AP1702AW SC59 E0
AP1702BW SC59 E2
AP1702CW SC59 E3
AP1702DW SC59 E4
AP1702EW SC59 E5
AP1702FW SC59 E6
AP1702GW SC59 W2
AP1703AW SC59 EG
AP1703BW SC59 EH
AP1703CW SC59 EI
AP1703DW SC59 EJ
AP1703EW SC59 EK
AP1703FW SC59 EL
AP1703GW SC59 W3
AP1704AW SC59 E7
AP1704BW SC59 E8
AP1704CW SC59 E9
AP1704DW SC59 EM
AP1704EW SC59 EN
AP1704FW SC59 EP
AP1704GW SC59 W4
Notes: 3. For Packaging Details, go to our website at http://www.diodes.com/datasheets/ap02007.pdf.
AP1701/2/3/4
NOT RECOMMENDED FOR NEW
DESIGN, USE (APX809/810)
3-PIN MICROPROCESSOR RESET CIRCUITS
AP1701/2/3/4 Rev. 2 9 of 10 JANUARY 2007
www.diodes.com © Diodes Incorporated
Package Information (All Dimensions in mm)
(1) Package Ty pe: SC59-3L
0.35/0.50
0.10/0.20
0.013/0.10 0.35/0.55
0.95
2.70/
3.00
2.90/3.10
1.00/
1.30
1.50/
1.70
1.90
TOP VIEW
0°/8°
(2) Package Type: SOT23
0.37/0.51
0º/8º
0.45/0.60
0.013/
0.10 0.45/0.61
TOP VIEW
0.085/0.180
1.20/1.40
2.30/2.50
2.80/3.00
0.89/
1.03
0.903/
1.10
1.80/2.00
AP1701/2/3/4
NOT RECOMMENDED FOR NEW
DESIGN, USE (APX809/810)
3-PIN MICROPROCESSOR RESET CIRCUITS
AP1701/2/3/4 Rev. 2 10 of 10 JANUARY 2007
www.diodes.com © Diodes Incorporated
IMPORTANT NOTICE
LIFE SUPPORT
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further
notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither
does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will
agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages.
Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the
President of Diodes Incorporated.
