AME8570AEET

AME, Inc. AME8570 n General Description The AME8570 family allows the user to customize the CPU reset function without any external components. The user has serveral choice of reset voltage thresholds, reset time intervals, and output driver configurations, all of which are preset at the factory. These circuits monitor the power supply voltage of µP based systems. When the power supply voltage drops below the voltage threshold a reset is asserted immediately ( within an interval TD1 ). The reset remains asserted after the supply voltage rises above the voltage threshold for a time interval, TD2. The reset output may be either active high ( RESET ) or active low ( RESETB ). The reset output may be configured as either push/pull or open drain. The state of the reset output is guaranteed to be correct only when supply voltage is greater than 1V. The AME8570 also provide a reset manually by pulling the MRB input to ground. Space saving SC-70 package and micropower quiescent current ( < 5.0µA ) make this family a natural for portable battery powered equipment. GND µProcessor Supervisory n Functional Block Diagram AME8570 Push-Pull RESET/ RESETB IN R1 I1 Delay R2 GND VREF N1 P1 RESET/ RESETB AME8570 Open-Drain RESET/RESETB IN R1 I1 Delay RESET/ RESETB N1 R2 VREF n Features l Small Packages : SC-70, SOT-23 l Tight Voltage Threshold Tolerance : ± 1.50% l W ide Temperature Range : -40OC to 85OC l Low Quiescent Current < 5.0 µA l Manual Reset Input Option l All AME's Lead Free Products Meet RoHS Standards AME8570 Push-Pull RESET/ RESETB with MRB MRB IN R1 I1 Delay R2 GND VREF N1 P1 RESET/ RESETB AME8570 Open-Drain RESET/ RESETB with MRB n Applications l Portable Electronics l Power Supplies l Computer Peripherals l Data Acquisition Systems l Applications using CPUs l Consumer Electronics 1 MRB IN R1 I1 Delay R2 GND VREF N1 RESET/ RESETB Rev. A.01 AME, Inc. AME8570 n Typical Operating Circuit µProcessor Supervisory VIN R*PULL-UP VIN µP PUSH BUTTON RESET / RESETB SWITCH MRB GND RESET INPUT GND Note: * External pull-up resistor is required if open-drain output is used. 10KΩ is recommended. n Pin Configuration SC-70-3 Top View 3 SOT-23 Top View AME8570AEIT 1. GND 2. RESET/RESETB 3 AME8570AEET 1. GND 2. RESET/RESETB AME8570 3. IN AME8570 3. IN 1 2 1 2 * Die Attach: Non-Conductive Epoxy SC-70-4 Top View 4 3 * Die Attach: Non-Conductive Epoxy AME8570AEIU 1. GND 2. RESET/RESETB AME8570 3. MRB 4. IN 1 2 * Die Attach: Non-Conductive Epoxy 2 Rev. A.01 AME, Inc. AME8570 n Pin Description AME8570AEIT / AME8570AEET µProcessor Supervisory Pin Number 1 2 Pin Name GND RESET/RESETB Ground Pin Description This pin can be ordered as RESET or RESETB. Reset is active high. RESETB is active low. It is also available with an open-drain or push-pull output. Positive power supply. A reset is asserted after this voltage drops below a predetermined level. After VIN rises above that level the reset output remains asserted until the end of the reset timeout period. 3 IN AME8570AEIU Pin Number 1 2 Pin Name GND RESET/RESETB Ground Pin Description This pin can be ordered as RESET or RESETB. Reset is active high. RESETB is active low. It is also available with an open-drain or push-pull output. 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. The pin is floating or tied to VIN , if it is unused. Positive power supply. A reset is asserted after this voltage drops below a predetermined level. After VIN rises above that level the reset output remains asserted until the end of the reset timeout period. 3 MRB 4 IN 3 Rev. A.01 AME, Inc. AME8570 n Ordering Information AME8570 x x x x x x xx x Special Feature VIN Threshold Voltage (VTH) Reset Time (TD2NOM) Output Driver Option Number of Pins Package Type Operating Ambient Temperature Range Pin Configuration µProcessor Supervisory Pin Configuration Operating Ambient Temperature Range Package Type Number of Pins T: 3 U: 4 Output Options Reset Time (T D2NOM) VIN Threshold Voltage (VTH) 23: V TH=2.32V 26: V TH=2.63V 29: V TH=2.93V 31: V TH=3.08V 46: V TH=4.63V Special Feature E: -40OC to 85OC 1. G ND (SOT-23 ) 2. RESET/ (SC-70 -3) R ESETB 3. IN A A (SC-70 -4) E: SOT-2X I: SC-70 A: B: C: D: RESETB/PP RESETB/OD RESET/PP RESET/OD F: 210ms Z: Lead free 1. GND 2. RESET/ R ESE T B 3. MRB 4. IN (RESET=Active High) (RESETB=Active Low) (PP=Push-pull out) (OD=Open-Drain 4 Rev. A.01 AME, Inc. AME8570 n Ordering Information Part Number AME8570AEETAF23Z AME8570AEITAF23Z AME8570AEIUAF23Z AME8570AEETAF26Z AME8570AEITAF26Z AME8570AEIUAF26Z AME8570AEETAF29Z AME8570AEITAF29Z AME8570AEIUAF29Z AME8570AEETCF29Z AME8570AEITCF29Z AME8570AEIUCF29Z AME8570AEETAF31Z AME8570AEITAF31Z AME8570AEIUAF31Z AME8570AEETBF31Z AME8570AEITBF31Z AME8570AEIUBF31Z AME8570AEETAF46Z AME8570AEITAF46Z AME8570AEIUAF46Z AME8570AEETCF46Z AME8570AEITCF46Z AME8570AEIUCF46Z µProcessor Supervisory Marking* BJOww BJPw BJQw BJRww BJSw BJTw BJUww BJVw BJWw BJXww BJYw BJZw BKAww BKBw BKCw BKDww BKEw BKFw BKGww BKHw BKIw BKJww BKKw BKLw Output Voltage 2.32V 2.32V 2.32V 2.63V 2.63V 2.63V 2.93V 2.93V 2.93V 2.93V 2.93V 2.93V 3.08V 3.08V 3.08V 3.08V 3.08V 3.08V 4.63V 4.63V 4.63V 4.63V 4.63V 4.63V Package SOT-23 SC-70-3 SC-70-4 SOT-23 SC-70-3 SC-70-4 SOT-23 SC-70-3 SC-70-4 SOT-23 SC-70-3 SC-70-4 SOT-23 SC-70-3 SC-70-4 SOT-23 SC-70-3 SC-70-4 SOT-23 SC-70-3 SC-70-4 SOT-23 SC-70-3 SC-70-4 Operating Ambient Temperature 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 -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 Note: ww & w represents the date code and pls refer to the Date Code Rule on Package Dimension. * A line on top of the first letter represents lead free plating such as BJOww. Pls consult AME sales office or authorized Rep./Distributor for the availability of output voltage or package type. 5 Rev. A.01 AME, Inc. AME8570 n Absolute Maximum Ratings Parameter Supply Voltage Input Current, VIN 20 Output Current, RESET, RESETB ESD Classification B* mA µProcessor Supervisory Maximum 6 Unit V Note: Caution: Stress above the listed in absolute maximum ratings may cause permanent damage to the device. * HBM B: 2000V ~ 3999V n Recommended Operating conditions Parameter Ambient Temperature Range Junction Temperature Range Storage Temperature Range Symbol TA TJ TSTG Rating - 40 to 85 - 40 to 125 - 65 to 150 Unit O C n Thermal Information Parameter Thermal Resistance* (Junction to Case) Thermal Resistance (Junction to Ambient) Internal Power Dissipation Solder Iron (10 Sec) ** Package SOT-23 Die Attach Symbol Maximum θJC 140 Unit o C/W SOT-23 Non-Conductive Epoxy θJA PD 280 SOT-23 400 350 mW o C * Measure θJC on center of molding compound if IC has no tab. ** MIL-STD-202G 210F 6 Rev. A.01 AME, Inc. AME8570 n Electrical Specifications TA = 25OC unless otherwise noted. Parameter VIN Range Supply Current Symbol VRANGE IIN Test Condition TA = -40oC to 85oC VIN = VTH x1.10, TA = -40 C to 85 C MRB unconnected VTH -1.5% TA = -40 C to 85 C Hysteresis Range RESETB Output Voltage High VOH RESET Output Voltage High RESETB Output Voltage Low RESET Output Voltage Low VIN to RESET Delay RESET Timeout Period MRB Input Threshold MRB Pulse Width MRB Noise Immunity (pulse width with no reset) MRB to RESET Delay MRB Pull Up Resistance 80 VIN < VTH (MIN) VHYST VRelease - VTH ISOURCE = 0.5mA, VIN > VTH (MAX) VIN > 1.8V ISOURCE = 0.15mA, 1.8V >= VIN > 1.0V ISOURCE = 0.5mA, VIN > 1.8V ISOURCE = 0.15mA, 1.8V >= VIN > 1.0V VOL TD1 TD2 MRB I L MRB IH VIN < VTH (MIN) VIN > VTH (MAX) TA = -40oC to 85oC ISINK = 1.2mA, TJ = -40oC to 85oC 40 140 210 600 0.7 0.8V IN 1 100 500 120 0.5 V µS mS V µS nS nS KΩ 0.8V IN V o o o o µProcessor Supervisory Min 1 Typ Max 5.5 Units V µA 5 10 VTH +1.5% VTH +2% RESET Threshold VTH VTH -2% 10 30 V 60 mV VIN = VTH -100mV; TA = -40oC to 85oC Version F VIN = VTH x 1.2 7 Rev. A.01 AME, Inc. AME8570 n Timing Diagram VRelease VTH µProcessor Supervisory VIN TD2 50% RESET TD1 50% TD2 50% RESETB TD1 50% n Applications Information Supply Transients These devices have a certain immunity to fast negative going transients. In the following pages the graph titled "Glitch Rejection" indicates the maximum allowable glitch amplitude and duration to avoid triggering an unintended reset. As shown in the graph shorter transients can have larger amplitudes without triggering resets. Glitch Rejection 140 120 600 550 500 Reset Time vs. Temperature Glitch Duration (µS) 100 80 60 40 20 0 0.01 0.1 1 Reset Time (ms) 450 400 350 300 250 200 150 -45 -35 -25 -15 -5 5 15 25 35 45 55 65 75 85 95 105 115 Glitch Amplitude (V) Temperature (oC) 8 Rev. A.01 AME, Inc. AME8570 n Detailed Description The AME8570 are designed to interface with the reset input of a microprocessor and to prevent code-execution errors due to power up, power down, and other power supply errors. 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. Active high reset outputs are denoted as RESET. Active low reset outputs are denoted as RESETB. The selection guide on this data sheet shows all possible combinations of output driver configuration. A reset will be asserted if any of two things happen: 1) VIN drops below the threshold (VTH) 2) The MRB pin is pulled low. Manual Reset Input The AME8570 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 VIN by a 100K resistor. It is internally debounced to reject switching transients. The MRB pin is ESD protected by diodes connected to VIN and GND. So the MRB pin should never be driven higher than VIN or lower than GND. µProcessor Supervisory Glitch Rejection The AME8570 family will reject negative going transients on the VIN 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 VIN W ith VIN voltage on the order of the MOS transistor threshold (