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AP1701/2/3/4
3-PIN MICROPROCESSOR RESET CIRCUITS
Features
* * * * * * * * * * * * Precision Monitoring of +2.5V, +3V, +3.3V, and +5V Power-Supply Voltages Fully Specified Over Temperature Available in three Output Configurations Push-Pull RESET Low Output (AP1701/3) Push-Pull RESET High Output (AP1702/4) 200ms Min. Power-On Reset Pulse Width 20A Supply Current (Typ.) Guaranteed Reset Valid to VCC = +1V Power Supply Transient Immunity No External Components Green Package: SC59-3L Lead Free Finish / RoHS Compliant (Note1)
General Description
The AP1701/2/3/4 are used for microprocessor (P) supervisory circuits to monitor the power supplies in P 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. 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.
Applications
* * * * * * Computers Controllers Intelligent Instruments Critical P and C Power Monitoring Portable/Battery Powered Equipment Automotive
Ordering Information
AP170X X X X X
Enable
1 2 3 4 : Active-Low : Active-High : Active-Low : Active-High
Voltage
A B C D E F G : 4.63 : 4.38 : 4.00 : 3.08 : 2.93 : 2.63 : 2.25
Package
W : SC59
Lead Free
L : Lead Free G : Green
Packing
-7 : Taping
Notes: 1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.
Device
AP170XXW
Package Packaging Code (Note 2)
W SC59
Quantity
7" Tape and Reel Part Number Suffix
-7
3000/Tape & Reel
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.
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AP1701/2/3/4
3-PIN MICROPROCESSOR RESET CIRCUITS
Pin Assignments
(Top View) (Top View)
GND
1 AP1701 AP1702 3 VCC
RESET (RESET)
1 AP1703 AP1704 3 VCC
RESET (RESET)
2
GND
2
SC59-3L Pin Descriptions
SC59-3L
Name GND RESET (RESET) VCC
Description Ground Reset Output Pin L: for AP1701/3 H: for AP1702/4 Operating Voltage Input
Absolute Maximum Ratings
Symbol VCC VRESET ICC IO PD TOP TST Parameter Terminal Voltage (with respect to GND) RESET, RESET (push-pull) Input Current, VCC Output Current, RESET, RESET Continuous Power Dissipation (TA = +70C), de-rate 4mW/C above +70C Operating Junction Temperature Range Storage Temperature Range Rating -0.3 to +6.0 -0.3 to (VCC + 0.3) 20 20 320 -40 to +105 -65 to +150 Unit V V mA mA mW C C
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Electrical Characteristics
Symbol Parameter VCC VCC Range ICC Supply Current
(TA = 25C)
VTH
TS TDELAY VOL VOH VOL VOH
Conditions TA = 0oC to +70oC VTH + 1.0V AP1701/2/3/4A AP1701/2/3/4B AP1701/2/3/4C Reset Threshold AP1701/2/3/4D TA = 25C AP1701/2/3/4E AP1701/2/3/4F AP1701/2/3/4G Reset Threshold Tempco Set-up Time VCC = 0 to (VTH - 100mV) Reset Active TA = 0oC to +70oC Timeout Period VCC = VTH min, ISINK = 1.2mA, AP1701/3 RESET Output V = V min, I CC TH SINK = 3.2mA Voltage Low VCC > 1.0V, ISINK = 50uA RESET Output VCC > VTH max, ISOURCE = 500uA, AP1701/3 VCC > VTH max, ISOURCE = 800uA Voltage-High RESET Output VCC = VTH max, ISINK = 1.2mA, AP1702/4 Voltage-Low VCC = VTH max, ISINK = 3.2mA RESET Output 1.8V < VCC < VTH min, ISOURCE = 150uA, Voltage-High AP1702/4
Min. 1.0 4.54 4.29 3.92 3.02 2.87 2.57 2.20
Typ. 20 4.63 4.38 4.00 3.08 2.93 2.63 2.25 30
Max. 5.5 30 4.72 4.47 4.08 3.14 2.99 2.68 2.30
Unit V A
V
100 100 240 600 0.3 0.4 0.3 0.8VCC VCC -1.5 0.3 0.4 0.8 VCC
ppm/ o C s ms V V V V
Typical Application Circuit
V CC Cin
0.1uF
V CC
V CC
AP170X
RESET (RESET)
Microprocessor
RESET INPUT
GND
GND
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Function Description
A microprocessor's (P's) reset input starts the P 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 VCC Transients In addition to issuing a reset to the P 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 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 100mV below the reset threshold and lasts 100s or less will not cause a reset pulse. A 0.1F bypass capacitor mounted as close as possible to the VCC pin provides additional transient immunity. Ensuring a Valid Reset Output Down to VCC = 0 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 for the reset timeout period.
RESET
remains low
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 P and other circuitry is inoperative with VCC below 1V. However, in
applications where pull down resistor to
RESET must be valid down to 0V, adding a 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 small enough to pull
RESET
and
RESET to ground. For the AP1702/4 if RESET is required to remain valid for VCC < 1V.
RESET is guaranteed to be a logic low for VCC > 1V. Once VCC exceeds the reset threshold, an internal timer keeps RESET RESET RESET
low for the reset timeout period; after this interval, goes high. If a brownout condition occurs (VCC dips
Benefits of Highly Accurate Reset Threshold Most P 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.
Block Diagram
Driver Delay Circuit VREF RESET / RESET
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Performance Characteristics
Threshold
2.928
24 20 16 Iq 12 8
2.926
2.924
2.922
4 0 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120
2.92
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90
Temp ( C )
Iq vs. Temp
Temp
Threshold vs. Temp
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Timing Diagram
VTH
VCC TDELAY Active Low TS TDELAY
Active High
TDELAY
TDELAY
Giltch Immunity
3500 Maximum Transient Duration(us) 3000 2500 2000 1500 1000 500 0 0 100 900 270 200 140 90 70 500 58 600 50 700 50 800 48 48 3000
300
400
900 1000 1100
RESET COMPARATOR OVERDRIVE(mV)
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Marking Information
(1) SC59-3L
(Top View) 3 XX Y M X 1 2 XX : Identification code : Year 0-9 Y : Month A~L M L : Lead Free Package G : Green Package
Device AP1701AW AP1701BW AP1701CW AP1701DW AP1701EW AP1701FW AP1701GW AP1702AW AP1702BW AP1702CW AP1702DW AP1702EW AP1702FW AP1702GW AP1703AW AP1703BW AP1703CW AP1703DW AP1703EW AP1703FW AP1703GW AP1704AW AP1704BW AP1704CW AP1704DW AP1704EW AP1704FW AP1704GW
Package
(Note 3)
Identification Code EA EB EC ED EE EF W1 E0 E2 E3 E4 E5 E6 W2 EG EH EI EJ EK EL W3 E7 E8 E9 EM EN EP W4
SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59 SC59
Notes:
3. For Packaging Details, go to our website at http://www.diodes.com/datasheets/ap02007.pdf.
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3-PIN MICROPROCESSOR RESET CIRCUITS
Package Information
(1) Package Type: SC59-3L
(All Dimensions in mm)
0.35/0.50
1.50/ 1.70
TOP VIEW
2.70/ 3.00
1.90 2.90/3.10 1.00/ 1.30 0.10/0.20
0.013/0.10
0.95
0.35/0.55 0/8
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3-PIN MICROPROCESSOR RESET CIRCUITS
IMPORTANT NOTICE 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. LIFE SUPPORT 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.
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