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| AME, Inc. AME8510 / 8520 / 8530 Micropower P Watch Dog Timer n General Description The AME8510/8520/8530 family allows the user to customize the CPU monitoring function without any external components. The user has a large choice of reset voltage thresholds and output driver configurations, all of which are preset at the factory. Each wafer is trimmed to the customer's specifications. These circuits will ignore fast negative going transients on VDD. The state of the reset output is guaranteed to be correct down to 1V. After VDD crosses above a factory preset threshold, the AME8510/8520/8530 assert a reset signal. After a predetermined time (the "reset" interval) the reset is deasserted. If VDD ever drops below the threshold voltage a reset is asserted immediately. In addition to a supply monitoring function the AME8510/8520 also monitor transitions at the watch dog (WDI) input. If a logic transition does not occur at the WDI pin within a certain time interval (the "watchdog" interval) then a reset is asserted. The reset deasserts after the reset interval, as explained earlier. The AME8510/8530 can both assert a reset manually by pulling the MRB input to ground. Space saving SOT-25 packages and micropower quiescent current make this family a natural for portable battery powered equipment. n Applications l l l l l Motherboards Computer peripherals Portable electronics Applications using CPUs Consumer electronics n Pin Configuration SOT-25 Top View 5 4 AME8510 AME8510 1. Reset/ResetB 2. GND 3. MRB 4. WDI 5. V DD 1 2 3 SOT-25 Top View 5 4 n Features l Small packages: SOT-25 l 7 voltage threshold options l Tight voltage threshold tolerance ---1.50% l 12 output driver configuration options l Wide temperature range -------- -40oC to 85oC l Low temperature coefficient --- 100ppm/o(max) l Low quiescent current < 3.0A l 3 bonding options AME8520 AME8520 1. Reset/ResetB 2. GND 3. ResetB/Reset 4. WDI 5. VDD 1 2 3 SOT-25 Top View 5 4 AME8530 AME8530 1. Reset/ResetB 2. GND 3. ResetB/Reset 4. MRB 5. V DD 1 2 3 1 AME, Inc. AME8510 / 8520 / 8530 Micropower P Watch Dog Timer n Pin Description Pin # Pin Name AME8510 AME8520 AME8530 This pin may be either RESET or RESETB. RESETB is active low. In the case of the AME8520 and AME8530 this pin will always be the opposite polarity from pin 3. This pin can be push/pull or open drain. Pin Description 1 1 1 RESET/ RESETB 2 2 2 GND Ground N/A 3 3 RESET/ RESETB This pin may be either RESETB or RESET. RESET is active high. In the case of the AME8520 and AME8530 this pin will always be the opposite polarity from pin 1. This pin can be either push/pull or open drain. Manual Reset. Active low. Pulling this pin low forces a reset. After a low to high transition reset remains asserted for exactly one reset timeout period. This pin is internally pulled high. If this function is unused then float this pin or tie it to VDD . 3 N/A 4 MRB 4 4 N/A WDI Watch Dog Input. Any transition on this pin will reset the watch dog timer. If this pin remains high or low for longer than the watch dog interval then a reset is asserted. Float or tristate this pin to disable the watch dog feature. Positive power supply. A reset is asserted after this voltage drops below a predetermined level. After VDD rises above that level reset remains asserted until the end of the reset timeout period. 5 5 5 VDD 2 AME, Inc. AME8510 / 8520 / 8530 Micropower P Watch Dog Timer n Ordering Information AME8510 x x x x x x x x Special Feature VDD Threshold Voltage (VTH) Reset Time (TD2NOM) Output Driver Option Number of Pins Package Type Operating Temperature Range Pin Configuration Operating Temperature Range VDD Package Number Output Driver Reset Time Wach Dog Threshold of Type Option (TD2NOM) Interval Voltage (V TH ) Pins V: 5 PIN1 F: TD= 210ms E: 1760 ms A: RESETB/PP X: without B: RESETB/OD WDI C: RESET/PP option D: RESET/OD E: RESETB/PP F: RESETB/PP G: RESETB/OD H: RESETB/OD I: RESET/PP J: RESET/PP K: RESET/OD L: RESET/OD PIN3 E: RESET/PP F: RESET/OD G: RESET/PP H: RESET/OD I: RESETB/PP J: RESETB/OD K: RESETB/PP L: RESETB/OD (RESET = Active High) (RESETB = Active Low) (PP = Push pull out) (OD = Open drain output polarity) Pin Configuration Special Feature A: 1. Reset/ ResetB 2. GND 3. MRB 4. WDI 5. VDD E: -40OC to 85OC E: SOT-2X 22: VTH= 23: VTH= 26: VTH= 29: VTH= 31: VTH= 44: VTH= 46: VTH= 2.19V L: Low profile 2.32V Y: Lead free & 2.63V Low profile 2.93V Z: Lead free 3.08V 4.38V 4.63V 3 AME, Inc. AME8510 / 8520 / 8530 Micropower P Watch Dog Timer n Ordering Information AME8520 x x x x x x x x Special Feature VDD Threshold Voltage (VTH) Reset Time (TD2NOM) Output Driver Option Number of Pins Package Type Operating Temperature Range Pin Configuration Operating Temperature Range Package Number Output Driver Reset Time of Type Option (TD2NOM) Pins V: 5 Watch Dog Interval VDD Threshold Voltage (VTH ) 22: VTH= 23: VTH= 26: VTH= 29: VTH= 31: VTH= 44: VTH= 46: VTH= Pin Configuration Special Feature A: 1. Reset/ ResetB 2. GND 3. Reset/ ResetB 4. WDI 5. VDD E: -40OC to 85OC E: SOT-2X F: TD = 210ms E: 1760 ms PIN1 A: RESETB/PP X: without B: RESETB/OD WDI C: RESET/PP option D: RESET/OD E: RESETB/PP F: RESETB/PP G: RESETB/OD H: RESETB/OD I: RESET/PP J: RESET/PP K: RESET/OD L: RESET/OD PIN3 E: RESET/PP F: RESET/OD G: RESET/PP H: RESET/OD I: RESETB/PP J: RESETB/OD K: RESETB/PP L: RESETB/OD (RESET = Act ive High) (RESETB = Act ive Low) (PP = Push pull out ) (OD = Open drain out put polarit y) 2.19V L: Low profile 2.32V Y: Lead free & 2.63V Low profile 2.93V Z: Lead free 3.08V 4.38V 4.63V 4 AME, Inc. AME8510 / 8520 / 8530 Micropower P Watch Dog Timer n Ordering Information AME8530 x x x x x x x x Special Feature VDD Threshold Voltage (VTH) Reset Time (TD2NOM) Output Driver Option Number of Pins Package Type Operating Temperature Range Pin Configuration Pin Configuration Operating Temperature Range Package Type Number Output Driver of Option Pins V: 5 Reset Time (TD2NOM) Watch Dog Interval VDD Threshold Voltage (V TH ) 22: VTH= 23: VTH= 26: VTH= 29: VTH= 31: VTH= 44: VTH= 46: VTH= Special Feature A: 1. Reset/ ResetB 2. GND 3. Reset/ ResetB 4. MRB 5. VDD E: -40OC to 85OC E: SOT-2X F: TD= 210ms E: 1760 ms PIN1 A: RESETB/PP X: without B: RESETB/OD WDI C: RESET/PP option D: RESET/OD E: RESETB/PP F: RESETB/PP G: RESETB/OD H: RESETB/OD I: RESET/PP J: RESET/PP K: RESET/OD L: RESET/OD PIN3 E: RESET/PP F: RESET/OD G: RESET/PP H: RESET/OD I: RESETB/PP J: RESETB/OD K: RESETB/PP L: RESETB/OD (RESET = Act ive High) (RESETB = Active Low) (PP = Push pull out ) (OD = Open drain out put polarit y) 2.19V L: Low profile 2.32V Y: Lead free & 2.63V Low profile 2.93V Z: Lead free 3.08V 4.38V 4.63V 5 AME, Inc. AME8510 / 8520 / 8530 Micropower P Watch Dog Timer n Ordering Information Part Number AME8510AEEVAFE26 AME8510AEEVAFE29 AME8510AEEVAFE31 AME8510AEEVBDD29 AME8510AEEVEFE31 AME8520AEEVEFE26 AME8520AEEVEFE29 AME8520AEEVEFE31 AME8520AEEVEFE44 AME8530AEEVAFX29 AME8530AEEVAFX31 AME8530AEEVEFX29 AME8530AEEVEFX29Z AME8530AEEVEFX31 Marking ATGww ATXww ASMww ARXww ATUww ATCww ATVww ATLww ATWww AVEww AVFww AUSww AUSww ATNww VTH Voltage 2.63V 2.93V 3.08V 2.93V 3.08V 2.63V 2.93V 3.08V 4.38V 2.93V 3.08V 2.93V 2.93V 3.08V Package SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 SOT-25 Operating Temp. Range - 40oC to + 85oC - 40oC to + 85oC - 40oC to + 85oC - 40oC to + 85oC - 40oC to + 85oC - 40oC to + 85oC - 40oC to + 85oC - 40oC to + 85oC - 40oC to + 85oC - 40oC to + 85oC - 40oC to + 85oC - 40oC to + 85oC - 40oC to + 85oC - 40oC to + 85oC Please consult AME sales office or authorized Rep./Distributor for other RESET TIME interval and Watch Dog time interval. 6 AME, Inc. AME8510 / 8520 / 8530 Micropower P Watch Dog Timer n Absolute Maximum Ratings Parameter Supply Voltage ESD Classification Maximum 6 B Unit V Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device n Recommended Operating Conditions Parameter Supply Voltage Ambient Temperature Range Junction Temperature Rating 0.9 - 5 - 40 to + 85 - 40 to + 125 Unit V o C C o n Thermal Information Parameter Thermal Resistance (SOT-25) Maximum Junction Temperature Maximum Lead Temperature (10 Sec) Maximum 256 150 300 Unit o C/W o C C o 7 AME, Inc. AME8510 / 8520 / 8530 Micropower P Watch Dog Timer n Electrical Specifications TA = 25OC unless otherwise noted Parameter VDD Range Supply Current Reset Threshold* ResetB Output Voltage Hgh Reset Output Voltage Hgh ResetB Output Voltage Low Reset Output Voltage Low VDD to Reset Delay Reset Timeout Period* Watch Dog Timeout Period* WDI Pulse Width TD1 TD2 TWD TWDI WDIIL WDI Input Threshold WDIIH WDI Input Current IIL IIH MRBIL MRB Input Threshold MRBIH MRB Pulse Width MRB Noise Immunity (pulse width with no reset) MRB to Reset Delay MRB Pull Up Resistance TDMRB 80 TWMRB V DD = VTH x 1.2 0.8 VDD 1 100 500 120 WDI = 0V WDI = VDD = 5.0V V DD = VTH x 1.2 0.8 VDD -15 -8 8 15 0.7 V Symbol V RANGE IDD VTH VDD >VTH max VDD VOH V ISNK=1.2mA, TA= -40~85oC 40 210 0.5 V S 280 mS mS nS 0.7 V V A 1120 1760 2400 50 S nS nS K ohm * See the chart on page 3 for available values of this parameter. 8 AME, Inc. AME8510 / 8520 / 8530 Micropower P Watch Dog Timer n Detailed Description The AME8510/8520/8530 are designed to interface with the reset input of a microprocessor and to prevent CPU execution errors due to power up, power down, and other power supply errors. The AME8510/8520 also monitor the CPU health by checking for signal transitions from the CPU at the WDI input. Reset Output Each output pin in the family can be configured to be either push/pull or open drain. In addition each output may be either active high or active low with the condition that parts with two outputs must have opposite polarities. Active high reset outputs are denoted as RESET. Active low reset outputs are denoted as RESETB. The selection guide on page 3 of this data sheet shows all possible combinations of output driver configuration. A reset will be asserted if any of three things happen: 1) VDD drops below the threshold (VTH) 2) The MRB pin is pulled low. 3) The WDI pin does not detect a transition within the watch dog interval (TWD). The reset will remain asserted for the prescribed reset interval after: 1) VDD rises above the threshold (VTH) 2) MRB goes high 3) The watch dog timer has timed out causing the reset to assert. Manual Reset Input The AME8510 and AME8530 feature a manual reset feature (MRB). A logic low on the MRB pin asserts a reset. The reset remains asserted as long as the MRB pin remains low. After the MRB pin transitions to a high state the reset remains asserted for the prescribed reset interval (TD2). The MRB pin is internally pulled up to VDD by a 100K resistor. It is internally debounced to reject switching transients. The MRB pin is ESD protected by diodes connected to VDD and GND. So the MRB pin should never be driven higher than VDD or lower than GND. Watchdog Input The AME8510 and AME8520 are equipped with a watchdog input (WDI). If the microprocessor does not produce a valid logic edge at the the watchdog input (WDI) within the prescribed watchdog interval (TWD) then a reset asserts. The reset remains asserted for the required reset interval (TD2) At the end of the reset interval the reset is deasserted and the watchdog interval timer starts again from zero. If the watchdog input is left unconnected or is connected to a tri-stated buffer the watchdog function is disabled. As soon as the WDI input is driven either low or high the watchdog function resumes with the watchdog timer set to zero. VRelease VTH VTH VDD VDD TD1 RESET TD2 50% 50% RESETB TD2 TWD TD2 TD2 RESETB TD1 50% 50% WDI Reset Timing Diagram Watchdog Timing Diagram 9 AME, Inc. AME8510 / 8520 / 8530 Micropower P Watch Dog Timer n Detailed Description(contd.) Watchdog Input Current The watchdog input pin (WDI) typically sources/sinks 8A when driven high or low. So from a power dissipation point of view the duty cycle of the waveform at WDI is unimportant. When the WDI pin is floating or tri-stated the power supply current falls to less than 3.0A. Glitch Rejection The AME8510/8520/8530 family will reject negative going transients on the VDD line to some extent. The smaller the duration of the transient the larger its amplitude may be without triggering a reset. The "Glitch Rejection" chart in the graphs section of this datasheet shows the relation between glitch amplitude and allowable glitch duration to avoid unintended resets. Accurate Output State at Low VDD With VDD voltage on the order of the MOS transistor threshold (<1.0V) the outputs of the AME8510/8520/8530 may become undefined. For parts with active low output (RESETB) a resistor placed between RESETB and GND on the order of 100K will ensure that the RESETB output stays low when VDD is lower than the threshold voltage of the part. In a like manner a resistor on the order of 100K when placed between RESET and VDD will ensure parts with active high output (RESET) will remain high when VDD is lower than the threshold voltage of the part. 10 AME, Inc. AME8510 / 8520 / 8530 Glitch Rejection 140 120 220 Micropower P Watch Dog Timer Reset Time vs. Temperature 215 Glitch Duration (S) 100 Reset Time (mS) 210 80 60 40 20 0 0.01 0.1 1 205 Vth=2.63V 200 195 190 -45 -5 25 55 85 115 Glitch Amplitude (V) Temperature ( oC) IDD vs. Temperature 2.35 2.650 2.648 Reset VTH vs. Temperature Supply Current @ 5V (uA) 2.30 2.646 2.644 2.25 Reset Vth (V) 2.642 2.640 2.638 2.636 2.634 2.632 2.20 Vth=2.63V Vth=2.63V 2.15 2.10 -45 -5 25 55 85 115 2.630 -45 -5 25 55 85 115 Temperature (oC) Temperature (oC) Reset VOL vs. Temperature 0.265 0.260 Reset VOL @ 0.8mA (V) 0.255 0.250 0.245 0.240 0.235 0.230 0.225 0.220 -45 Vth=2.63V -5 25 55 85 115 Temperature ( oC) 11 AME, Inc. AME8510 / 8520 / 8530 Micropower P Watch Dog Timer n Package Dimension SOT-25 Top View D L Side View SYMBOLS A A1 b D E e H L e1 A MILLIMETERS MIN 0.00 0.30 2.70 1.40 INCHES MIN 0.0000 0.0118 0.1063 0.0551 MAX 0.15 0.55 3.10 1.80 MAX 0.0059 0.0217 0.1220 0.0709 1.20REF 0.0472REF H E S1 e c 1 1.90 BSC 2.60 3.00 0.07480 BSC 0.10236 0.11811 0.0146BSC 0o 10o 0.37BSC 0o 10o Front View S1 0.95BSC 0.0374BSC b 12 A1 www.ame.com.tw E-Mail: sales@ame.com.tw Life Support Policy: These products of AME, Inc. are not authorized for use as critical components in life-support devices or systems, without the express written approval of the president of AME, Inc. AME, Inc. reserves the right to make changes in the circuitry and specifications of its devices and advises its customers to obtain the latest version of relevant information. (c) AME, Inc. , June 2003 Document: 2007-DS8510/8520/8530-C Corporate Headquarter AME, Inc. 2F, 189 Kang-Chien Road, Nei-Hu Dist. Taipei 114 Taiwan, R.O.C. Tel: 886 2 2627-8687 Fax: 886 2 2659-2989 U.S.A. Subsidiary Analog Microelectronics, Inc. 3100 De La Cruz Blvd. Suite 201 Santa Clara, CA. 95054-2046 Tel : (408) 988-2388 Fax: (408) 988-2489 |
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