AME, Inc. Micropower µP Watch Dog Timer AME8510 / 8520 / 8530 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 Features l Small packages: SOT-25 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 1 2 AME8510 1. Reset/ResetB 2. GND 3. MRB 4. WDI 5. V DD 3 SOT-25 Top View 5 4 AME8520 1 2 AME8520 1. Reset/ResetB 2. GND 3. ResetB/Reset 4. WDI 5. VDD 3 l 7 voltage threshold options SOT-25 Top View l Tight voltage threshold tolerance ---±1.50% l 12 output driver configuration options l Wide temperature range -------- -40oC to 85oC 5 4 l Low temperature coefficient --- 100ppm/o(max) l Low quiescent current < 3.0µA AME8530 l 3 bonding options 1 2 AME8530 1. Reset/ResetB 2. GND 3. ResetB/Reset 4. MRB 5. V DD 3 1 AME, Inc. Micropower µP Watch Dog Timer AME8510 / 8520 / 8530 n Pin Description Pin # Pin Name Pin Description 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. AME8510 AME8520 AME8530 1 1 1 RESET/ RESETB 2 2 2 GND 3 RESET/ RESETB N/A 3 4 5 2 3 N/A 4 5 4 N/A 5 Ground 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. MRB 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 . 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. VDD 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. AME, Inc. Micropower µP Watch Dog Timer AME8510 / 8520 / 8530 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 Pin Configuration A: 1. Reset/ ResetB 2. GND 3. MRB 4. WDI 5. VDD Operating Temperature Range VDD Package Number Output Driver Reset Time Wach Dog Threshold of Type Option (TD2NOM) Interval Voltage (V TH ) Pins E: -40OC to 85OC E: SOT-2X 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 22: VTH= 23: VTH= 26: VTH= 29: VTH= 31: VTH= 44: VTH= 46: VTH= Special Feature 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 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) 3 AME, Inc. Micropower µP Watch Dog Timer AME8510 / 8520 / 8530 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 Pin Configuration A: 1. Reset/ ResetB 2. GND 3. Reset/ ResetB 4. WDI 5. VDD Operating Temperature Range Package Number Output Driver Reset Time of Type Option (TD2NOM) Pins E: -40OC to 85OC E: SOT-2X V: 5 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) 4 Watch Dog Interval VDD Threshold Voltage (VTH ) 22: VTH= 23: VTH= 26: VTH= 29: VTH= 31: VTH= 44: VTH= 46: VTH= Special Feature 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 AME, Inc. Micropower µP Watch Dog Timer AME8510 / 8520 / 8530 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 A: 1. Reset/ ResetB 2. GND 3. Reset/ ResetB 4. MRB 5. VDD Operating Temperature Range Package Type E: -40OC to 85OC E: SOT-2X Number Output Driver of Option Pins V: 5 Reset Time (TD2NOM) Watch Dog Interval 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 VDD Threshold Voltage (V TH ) 22: VTH= 23: VTH= 26: VTH= 29: VTH= 31: VTH= 44: VTH= 46: VTH= Special Feature 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 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) 5 AME, Inc. Micropower µP Watch Dog Timer AME8510 / 8520 / 8530 n Ordering Information Part Number Marking VTH Voltage Package Operating Temp. Range AME8510AEEVAFE26 ATGww 2.63V SOT-25 - 40oC to + 85oC AME8510AEEVAFE29 ATXww 2.93V SOT-25 - 40oC to + 85oC AME8510AEEVAFE31 ASMww 3.08V SOT-25 - 40oC to + 85oC AME8510AEEVBDD29 ARXww 2.93V SOT-25 - 40oC to + 85oC AME8510AEEVEFE31 ATUww 3.08V SOT-25 - 40oC to + 85oC AME8520AEEVEFE26 ATCww 2.63V SOT-25 - 40oC to + 85oC AME8520AEEVEFE29 ATVww 2.93V SOT-25 - 40oC to + 85oC AME8520AEEVEFE31 ATLww 3.08V SOT-25 - 40oC to + 85oC AME8520AEEVEFE44 ATWww 4.38V SOT-25 - 40oC to + 85oC AME8530AEEVAFX29 AVEww 2.93V SOT-25 - 40oC to + 85oC AME8530AEEVAFX31 AVFww 3.08V SOT-25 - 40oC to + 85oC AME8530AEEVEFX29 AUSww 2.93V SOT-25 - 40oC to + 85oC AME8530AEEVEFX29Z AUSww 2.93V SOT-25 - 40oC to + 85oC AME8530AEEVEFX31 ATNww 3.08V SOT-25 - 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. Micropower µP Watch Dog Timer AME8510 / 8520 / 8530 n Absolute Maximum Ratings Parameter Maximum Unit Supply Voltage 6 V ESD Classification B Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device n Recommended Operating Conditions Parameter Supply Voltage Rating Unit 0.9 - 5 V Ambient Temperature Range - 40 to + 85 o Junction Temperature - 40 to + 125 o C C n Thermal Information Parameter Maximum Unit o Thermal Resistance (SOT-25) 256 Maximum Junction Temperature 150 o C Maximum Lead Temperature (10 Sec) 300 o C C/W 7 AME, Inc. Micropower µP Watch Dog Timer AME8510 / 8520 / 8530 n Electrical Specifications TA = 25OC unless otherwise noted Parameter VDD Range Symbol Test Condition V RANGE Supply Current IDD Reset Threshold* VTH ResetB Output Voltage Hgh VOH Typ 1 WDI and MRB unconnected 3 VTH -1.5% VDD >VTH max Reset Output Voltage Hgh VDD <VTH min ResetB Output Voltage Low VDD <VTH min VOL Reset Output Voltage Low Min VDD >VTH max VDD to Reset Delay TD1 VDD = VTH - 100mV Reset Timeout Period* TD2 TA= -40~85oC Watch Dog Timeout Period* TWD WDI Pulse Width TWDI ISOURCE=0.5mA, TA= -40~85oC Version F Version E 140 VTH +1.5% V 210 280 WDI = 0V IIH WDI = VDD = 5.0V 0.8 VDD -15 mS mS nS 0.7 IIL V µS 50 V V -8 8 15 µA 0.7 V DD = VTH x 1.2 MRBIH 0.8 VDD TWMRB 1 TDMRB MRB Pull Up Resistance * See the chart on page 3 for available values of this parameter. 8 µA 1120 1760 2400 MRB Noise Immunity (pulse width with no reset) MRB to Reset Delay 10.0 40 MRBIL MRB Pulse Width V 0.5 TA= -40~85oC V DD = VTH x 1.2 MRB Input Threshold 5.5 V ISNK=1.2mA, WDIIH WDI Input Current Units 0.8VDD WDIIL WDI Input Threshold Max 80 V µS 100 nS 500 nS 120 K ohm AME, Inc. Micropower µP Watch Dog Timer AME8510 / 8520 / 8530 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. 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 100KΩ 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 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 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. 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. 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. VTH VRelease VTH VDD VDD TD1 RESET TD2 50% TD2 50% TD1 50% RESETB TD2 TWD TD2 50% WDI RESETB Reset Timing Diagram Watchdog Timing Diagram 9 AME, Inc. AME8510 / 8520 / 8530 n Detailed Description(contd.) Watchdog Input Current The watchdog input pin (WDI) typically sources/sinks 8µA 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 3.0µA. 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 100KΩ 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 100KΩ 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 Micropower µP Watch Dog Timer AME, Inc. Micropower µP Watch Dog Timer AME8510 / 8520 / 8530 Glitch Rejection Reset Time vs. Temperature 140 220 215 100 Reset Time (mS) Glitch Duration (µ µ S) 120 80 60 40 210 Vth=2.63V 205 200 195 20 0 0.01 0.1 190 -45 1 -5 Glitch Amplitude (V) 25 55 85 115 Temperature ( oC) IDD vs. Temperature Reset VTH vs. Temperature 2.650 2.35 2.646 2.30 2.644 Reset Vth (V) Supply Current @ 5V (uA) 2.648 2.25 Vth=2.63V 2.20 2.15 2.642 2.640 2.638 Vth=2.63V 2.636 2.634 2.632 2.10 -45 -5 25 55 85 115 Temperature (oC) 2.630 -45 -5 25 55 85 115 Temperature (oC) Reset VOL vs. Temperature 0.265 Reset VOL @ 0.8mA (V) 0.260 0.255 0.250 0.245 0.240 0.235 Vth=2.63V 0.230 0.225 0.220 -45 -5 25 55 85 115 Temperature ( oC) 11 AME, Inc. Micropower µP Watch Dog Timer AME8510 / 8520 / 8530 n Package Dimension SOT-25 Top View Side View SYMBOLS D E H L MIN £ c 1 S1 A A1 MAX 0.0472REF 0.15 0.0000 0.0059 b 0.30 0.55 0.0118 0.0217 D 2.70 3.10 0.1063 0.1220 E 1.40 1.80 0.0551 0.0709 e è1 A 12 MIN 0.00 L Front View MAX 1.20REF INCHES A1 H e b MILLIMETERS S1 1.90 BSC 2.60 3.00 0.37BSC 0o 10o 0.95BSC 0.07480 BSC 0.10236 0.11811 0.0146BSC 0o 10o 0.0374BSC www.ame.com.tw E-Mail: [email protected] 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. AME, Inc. , June 2003 Document: 2007-DS8510/8520/8530-C Corporate Headquarter U.S.A. Subsidiary AME, Inc. Analog Microelectronics, Inc. 2F, 189 Kang-Chien Road, Nei-Hu Dist. Taipei 114 Taiwan, R.O.C. 3100 De La Cruz Blvd. Suite 201 Santa Clara, CA. 95054-2046 Tel: 886 2 2627-8687 Fax: 886 2 2659-2989 Tel : (408) 988-2388 Fax: (408) 988-2489