AS705 ALSC | Alldatasheet

Document overview

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  • PDF pages: 16

Technical content

Features

  • Precision power supply monitor
  • 4.65V threshold (ASM705/707/813L)
  • 4.40V threshold (ASM706/708)
  • Debounced manual reset input
  • Voltage monitor
  • 1.25V threshold
  • Battery monitor / Auxiliary supply monitor
  • Watchdog timer (ASM705/706/813L)
  • 200ms reset pulse width
  • Active HIGH reset out put (ASM707/708/813L)
  • MicroSO package

Applications

  • Computers and embedded controllers
  • Portable/Battery-operated systems
  • Intelligent instruments
  • Wireless communication systems
  • PDAs and hend-held equipment
  • Automative Systems
  • Safety Systems

Notice: The information in this document is subject to change without notice Low Power µP Supervisor Circuits ASM813L rev 1.5 February 2005 Block Diagrams Pin Configuration Transition Watchdog Timebase RESET WDI WDO RESET (RESET) ASM813L MR VCC PFI PFO GND Detector Timer Generator VCC 0.25mA ASM705 1.25V ASM813L 4.65V (ASM705/813L) 4.40V (ASM706) ASM706 RESET RESETMR VCC PFI PFO GND Generator VCC ASM707 1.25V RESET 4.65V (ASM707) 4.40V (ASM708) 0.25mA ASM708 MR VCC GND PFI RESET RESET NC PFO 4 5 MR VCC GND PFI (RESET) PFO 4 5

8 WDI

(RESET) ASM706 (ASM813L) ASM707 ASM708 ASM705 ASM706 (ASM813L) ASM707 ASM708

Notice: The information in this document is subject to change without notice Low Power µP Supervisor Circuits ASM813L rev 1.5 February 2005 Pin Description Pin Number Name FunctionASM705/706 ASM707/708 ASM813L DIP/ SO MicroSO DIP/ SO MicroSO DIP/ SO MicroSO 131313M R Manual reset input. The active LOW input triggers a reset pulse. A 250 µA pull-up current allows the pin to be driven by TTL/CMOS logic or shorted to ground with a switch. 242424 V CC +5V power supply input. 353535 G N D G r o u n d r e f e r e n c e f o r a l l s i gnals. 464646P F I Power-fail input voltage monitor. With PFI less than 1.25V, PFO goes LOW. Connect PFI to Ground or VCC when not in use. 575757 P F O Power-fail output. The output is active LOW and sinks current when PFI is less than 1.25V. 68- -68 W D I Watchdog input. WDI controls the internal watchdog timer. A HIGH or LOW signal for 1.6sec at WDI allows the internal timer to run-out, setting WDO LOW. The watchdog function is disabled by floating WDI or by con- necting WDI to a high impedance three-state buffer. The internal watchdog timer clears when: RESET is asserted; WDI is three-stated ; or WDI sees a rising or falling edge. - - 6 8 - - NC Not Connected 7 1 7 1 - - RESET Active LOW reset output. Pulses LOW for 200ms when triggered, and stays LOW whenever VCC is below the reset threshold. RESET remains LOW for 200ms after VCC rises above the reset threshold or MR goes from LOW to HIGH. A watchdog timeout will not trigger RESET unless WDO is connected to MR. 82- -82 W D O Watchdog output. WDO goes LOW when the 1.6 second internal watchdog timer times-out and does not go HIGH until the watchdog is cleared. In addition, when VCC falls below the reset threshold, WDO goes LOW. Unlike RESET, WDO does not have a minimum pulse width and as soon as VCC exceeds the reset threshold, WDO goes HIGH with no delay. - - 8 2 7 1 RESET Active HIGH reset output. The inverse of RESET. The ASM813L only has a RESET output.

Notice: The information in this document is subject to change without notice Low Power µP Supervisor Circuits ASM705 / 706 / 707 / 708 ASM813L rev 1.5 February 2005 Detailed Description A proper reset input enables a microprocessor / microcontroller to start in a known state. ASM70X and ASM813L assert reset to prevent code execution errors during power-up, power-down and brown-out conditions. RESET/RESET Timing The RESET/RESET signals are designed to start a µP/µC in a known state or return the system to a known state. The ASM707/708 have two reset outputs, one active-HIGH RESET and one active-LOW RESET output. The ASM813L has only an active -HIGH output. RESET is simply the complement of RESET. RESET is guaranteed to be LOW with V CC above 1.2V. During a power-up sequence, RESET remains low until the supply rises above the threshold level, either 4.65V or 4.40V. RESET goes high approximately 200ms after crossing the threshold. During power-down, RESET goes LOW as V CC falls below the threshold level and is guaranteed to be under 0.4V with VCC above 1.2V. In a brownout situation where V CC falls below the threshold level, RESET pulses low. If a brown-out occurs during an already initiated reset, the pulse will continue for a minimum of 140ms. Power Failure Detection With Auxiliary Comparator All devices have an auxiliary comparator with 1.25V trip point and uncommitted output (PFO ) and noninverting input (PFI). This comparator can be used as a supply voltage monitor with an external resistor voltage divider. The attenuated voltage at PFI should be set just below the 1.25 threshold. As the supply level falls, PFI is reduced causing the PFO output to transit LOW. Normally PFO interrupts the processor so the system can be shut down in a controlled manner. Manual Reset (MR) The active-LOW manual reset input is pulled high by a 250µA pull-up current and can be driven low by CMOS/TTL logic or a mechanical switch to ground. An external debounce circuit is unnecessary since the 140ms minimum reset time will debounce mechanical pushbutton switches. By connecting the watchdog output (WDO ) and MR , a watchdog timeout forces RESET to be generated. The ASM813L should be used w hen an active-HIGH RESET is required. Watchdog Timer The watchdog timer available on the ASM705/706/813L monitors µP/µC activity. An output line on the processor is used to toggle the WDI line. If this line is not toggled within 1.6 seconds, the internal timer puts the watchdog output, WDO , into a LOW state. WDO will remain LOW until a toggle is detected at WDI. If WDI is floated or connected to a three-stated circuit, the watchdog function is disabled, m eaning, it is cleared and not counting. The watchdog timer is also disabled if RESET is asserted. When RESET becomes inactive and the WDI input sees a high or low transition as short as 50ns, the watchdog timer will begin a 1.6 second countdown. Additional Figure 1: WDI Three-state operation VCC RESET MR WDO MR externally set low tMD tMR tRS VRT tRS

Notice: The information in this document is subject to change without notice Low Power µP Supervisor Circuits ASM705 / 706 / 707 / 708 ASM813L rev 1.5 February 2005 Monitoring a Negative Voltage The Power-Fail circuitry can also monitor a negative supply rail. When the negative rail is OK, PFO will be LOW, and when the negative rail is failing (not negative enough), PFO goes HIGH (the opposite of when positive voltages are monitored). To trigger a reset, these outputs need to be inverted: adding the resistors and transistor as shown achieves this. The RESET output will then have the same sense as for positive voltages: good = HIGH, bad = LOW. It should be noted that this circuit’s accuracy depends on the V CC line, the PFI threshold tolerance, and the resistors. VCC PFI MR PFO VCC ASM70x RESETGND To µP Figure 5: Monitoring a negative voltage 2N3904 VCC - 1.25 1.25 - VTRIP R2Negative Input Voltage

Notice: The information in this document is subject to change without notice Low Power µP Supervisor Circuits ASM813L rev 1.5 February 2005 Absolute Maximum Ratings Parameter Min Max Unit Pin Terminal Voltage with Respect to Ground VCC -0.3 6.0 V All other inputs 1 -0.3 VCC + 0.3 V Input Current at VCC and GND 20 mA Output Current: All outputs 20 mA Rate of Rise at VCC 100 V/µs Plastic DIP Power Dissipation (Derate 9mW/°C above 70°C) 700 mV SO Power Dissipation (Derate 5.9mW/°C above 70°C) 470 mW‘ MicroSO Power Dissipation (Derate 4.1mW/°C above 70°C) 330 mW Operating Temperature Range ASM705E/706E/707E/708E/813LE -40 +85 °C ASM705C/706C/707C/708C/813LC 0 70 °C Storage Temperature Range -65 160 °C Lead Temperature (Soldering 10sec) 300 °C ESD rating HBM MM 200 KV V Note: 1. The input voltage limits of PFI and MR can be exceeded if the input current is less than 10mA. These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for pro- longed time periods may affect device reliability.

Notice: The information in this document is subject to change without notice Low Power µP Supervisor Circuits ASM813L rev 1.5 February 2005

Electrical Characteristics

Unless otherwise noted, spec ifications are over the operating temperature range and V CC supply voltages are 2.7V to 5.5V (ASM706P, Parameter Symbol Conditions Min Typ Max Unit Operating Voltage Range VCC ASM705/6/7/8C 1.2 5.5 VASM813L 1.1 5.5 ASM705/6/7/8E, ASM813E 1.2 5.5 Supply Current ICC ASM705/706C/813LC 75 140 µA ASM705E/706E/813LE 75 140 ASM707C/708C 50 140 ASM707E/708E 50 140 RESET Threshold VRT ASM705/707/813L, Note 1 4.50 4.65 4.75 V ASM706/708 Note 1 4.25 4.40 4.50 RESET Threshold Hysteresis Note 1 40 mV RESET Pulse Width tRS Note 1 140 200 280 ms MR Pulse Width tMR 0.15 µs MR to RESET Out Delay tMD Note 1 0.25 µs MR Input Threshold VIH 2.0 V VIL 0.8 MR Pullup current MR = 0V 100 250 600 µA RESET Output Voltage ISOURCE = 800µA V CC - 1.5 VISINK = 3.2mA 0.4 ASM705/6/7/8, VCC = 1.2V, ISINK = 100µA 0.3 RESET Output Voltage ASM707/8/813L, ISOURCE = 800µA V CC-1.5 V ASM707/8, ISINK = 1.2mA 0.4 ASM813L, ISINK =3.2mA 0.4 ASM813L, VCC = 1.2V, ISOURCE = 4µA 0.9

Notice: The information in this document is subject to change without notice Low Power µP Supervisor Circuits ASM813L rev 1.5 February 2005 Notes 1: RESET (ASM705/6/7/8), RESET(ASM707/8, ASM813L) Watchdog Timeout Period tWD ASM705/6/813L 1.00 1.60 2.25 s WDI Pulse Width tWP VIL = 0.4V, VIH=0.8VCC, 50 ns WDI Input Threshold VIH ASM705/706/813L, VCC = 5V 3.5 V VIL 0.8 WDI Input Current ASM705/6/813L, WDI = VCC 50 150 µA ASM705/6/813L, WDI = 0V -150 -50 WDO Output Voltage VOH ASM705/6/813L, ISOURCE = 800µA V CC - 1.5 V VOL ASM705/6/813L, ISINK = 1.2mA 0.4 PFI Input Threshold VCC = 5V 1.2 1.25 1.3 V PFI Input Current -25 0.01 25 nA PFO Output Voltage VOH ISOURCE = 800µA V CC - 1.5 V VOL ISINK = 3.2mA 0.4 Parameter Symbol Conditions Min Typ Max Unit

Notice: The information in this document is subject to change without notice Low Power µP Supervisor Circuits ASM813L rev 1.5 February 2005 Package Dimensions 8-Pin MicroSO Inches Millimeteres Min Max Min Max A 0.032 0.044 0.81 1.10 A1 0.002 0.006 0.05 0.15 A2 0.030 0.038 0.76 0.97 b 0.012 BSC 0.30 BSC C 0.004 0.008 0.10 0.20 D 0.114 0.122 2.90 3.10 e 0.0256 BSC 0.65 BSC E 0.184 0.200 4.67 5.08 E1 0.114 0.122 2.90 3.10 L 0.016 0.026 0.41 0.66 S 0.0206 BSC 0.52 BSC a 0 °6 °0 °6 ° E1 E D A e b C L a 0.10mm 0.004in S

Notice: The information in this document is subject to change without notice Low Power µP Supervisor Circuits ASM813L rev 1.5 February 2005 Package Dimensions (contd) Plastic DIP (8-Pin) Symbol Dimensions Inches Millimeters Min Max Min Max A 0.210 5.33 A1 0.015 0.38 A2 0.115 0.195 2.92 4.95 b 0.014 0.022 0.36 0.56 b2 0.045 0.070 1.14 1.78 C 0.008 0.014 0.20 0.36 D 0.355 0.400 9.02 10.16 E 0.300 0.325 7.62 8.26 E1 0.240 0.280 6.10 7.11 e 0.10 BSC 2.54 BSC eB 0.430 10.92 L 0.115 0.150 2.92 3.81

Notice: The information in this document is subject to change without notice Low Power µP Supervisor Circuits ASM813L rev 1.5 February 2005 Package Dimensions (contd) SO (8-Pin) Symbol Dimensions Inches Millimeters Min Max Min Max A1 0.004 0.010 0.10 0.25 A 0.053 0.069 1.35 1.75 A2 0.049 0.059 1.25 1.50 B 0.012 0.020 0.31 0.51 C 0.007 0.010 0.18 0.25 D 0.193 BSC 4.90 BSC E 0.154 BSC 3.91 BSC e 0.050 BSC 1.27 BSC H 0.236 BSC 6.00 BSC L 0.016 0.050 0.41 1.27 θ 0° 8° 0° 8° D E H D A2 A θ L C B e

Notice: The information in this document is subject to change without notice Low Power µP Supervisor Circuits ASM813L rev 1.5 February 2005 Ordering Codes Part Number Reset Threshold Temperature Pins-Package Package Marking TIN - LEAD DEVICES ASM705 Active LOW Reset, Watchdog Output And Manual RESET ASM705CPA 4.65 0°C to +70 °C 8-Plastic DIP ASM705CPA ASM705CSA 4.65 0°C to +70 °C 8-SO ASM705CSA ASM705CUA 4.65 0°C to +70 °C 8-MicroSO ASM705CUA ASM705EPA 4.65 -40°C to +85° C 8-Plastic DIP ASM705EPA ASM705ESA 4.65 -40°C to +85°C 8-SO ASM705ESA ASM705EUA 4.65 -40°C to +85°C 8-MicroSO ASM705EUA ASM706 Active LOW Reset, Watchdog Output And Manual RESET ASM706CPA 4.40 0°C to +70 °C 8-Plastic DIP ASM706CPA ASM706CSA 4.40 0°C to +70 °C 8-SO ASM706CSA ASM706CUA 4.40 0°C to +70 °C 8-MicroSO ASM706CUA ASM706EPA 4.40 -40°C to +85° C 8-Plastic DIP ASM706EPA ASM706ESA 4.40 -40°C to +85°C 8-SO ASM706ESA ASM707 Active LOW & HIGH Reset with Manual RESET ASM707CPA 4.65 0°C to +70 °C 8-Plastic DIP ASM707CPA ASM707CSA 4.65 0°C to +70 °C 8-SO ASM707CSA ASM707CUA 4.65 0°C to +70 °C 8-MicroSO ASM707CUA ASM707EPA 4.65 -40°C to +85° C 8-Plastic DIP ASM707EPA ASM707ESA 4.65 -40°C to +85°C 8-SO ASM707ESA ASM708Active LOW & HIGH Reset with Manual RESET ASM708CPA 4.40 0°C to +70 °C 8-Plastic DIP ASM708CPA ASM708CSA 4.40 0°C to +70 °C 8-SO ASM708CSA ASM708CUA 4.40 0°C to +70 °C 8-MicroSO ASM708CUA ASM708EPA 4.40 -40°C to +85° C 8-Plastic DIP ASM708EPA ASM708ESA 4.40 -40°C to +85°C 8-SO ASM708ESA ASM813L Active HIGH Reset, Watchdog Output And Manual RESET ASM813LCPA 4.65 0°C to +70 °C 8-Plastic DIP ASM813LCPA ASM813LCSA 4.65 0°C to +70 °C 8-SO ASM813LCSA ASM813LCUA 4.65 0°C to +70 °C 8-MicroSO ASM813LCUA ASM813LEPA 4.65 -40°C to +85°C 8-Plastic DIP ASM813LEPA ASM813LESA 4.65 -40°C to +85°C 8-SO ASM813LESA

Notice: The information in this document is subject to change without notice Low Power µP Supervisor Circuits ASM813L rev 1.5 February 2005 Ordering Codes Note: For parts to be packed in Tape and Reel, add “-T” at the end of the part number. Part Number Reset Threshold Temperature Range Pins-Package Package Marking LEAD FREE DEVICES ASM705 Active LOW Reset, Watchdog Output And Manual RESET ASM705CPAF 4.65 0°C to +70 °C 8-Plastic DIP ASM705CPAF ASM705CSAF 4.65 0°C to +70 °C 8-SO ASM705CSAF ASM705CUAF 4.65 0°C to +70 °C 8-MicroSO ASM705CUAF ASM705EPAF 4.65 -40°C to +85°C 8-Plastic DIP ASM705EPAF ASM705ESAF 4.65 -40°C to +85°C 8-SO ASM705ESAF ASM705EUAF 4.65 -40°C to +85°C 8-MicroSO ASM705EUAF ASM706 Active LOW Reset, Watchdog Output And Manual RESET ASM706CPAF 4.40 0°C to +70 °C 8-Plastic DIP ASM706CPAF ASM706CSAF 4.40 0°C to +70 °C 8-SO ASM706CSAF ASM706CUAF 4.40 0°C to +70 °C 8-MicroSO ASM706CUAF ASM706EPAF 4.40 -40°C to +85°C 8-Plastic DIP ASM706EPAF ASM706ESAF 4.40 -40°C to +85°C 8-SO ASM706ESAF ASM707 Active LOW & HIGH Reset with Manual RESET ASM707CPAF 4.65 0°C to +70 °C 8-Plastic DIP ASM707CPAF ASM707CSAF 4.65 0°C to +70 °C 8-SO ASM707CSAF ASM707CUAF 4.65 0°C to +70 °C 8-MicroSO ASM707CUAF ASM707EPAF 4.65 -40°C to +85°C 8-Plastic DIP ASM707EPAF ASM707ESAF 4.65 -40°C to +85°C 8-SO ASM707ESAF ASM708Active LOW & HIGH Reset with Manual RESET ASM708CPAF 4.40 0°C to +70 °C 8-Plastic DIP ASM708CPAF ASM708CSAF 4.40 0°C to +70 °C 8-SO ASM708CSAF ASM708CUAF 4.40 0°C to +70 °C 8-MicroSO ASM708CUAF ASM708EPAF 4.40 -40°C to +85°C 8-Plastic DIP ASM708EPAF ASM708ESAF 4.40 -40°C to +85°C 8-SO ASM708ESAF ASM813L Active HIGH Reset, Watchdog Output And Manual RESET ASM813LCPAF 4.65 0°C to +70 °C 8-Plastic DIP ASM813LCPAF ASM813LCSAF 4.65 0°C to +70 °C 8-SO ASM813LCSAF ASM813LCUAF 4.65 0°C to +70 °C 8-MicroSO ASM813LCUAF ASM813LEPAF 4.65 -40°C to +85°C 8-Plastic DIP ASM813LEPAF ASM813LESAF 4.65 -40°C to +85°C 8-SO ASM813LESAF

Notice: The information in this document is subject to change without notice Low Power µP Supervisor Circuits ASM813L rev 1.5 February 2005 Feature Summary ASM705 ASM706 ASM707 ASM708 ASM813L Power fail detector ‹‹‹‹‹ Power-up/down RESET ‹‹‹‹‹ Watchdog Timer ‹‹ ‹ Active HIGH RESET output ‹‹‹ Active LOW RESET output ‹‹‹‹

Alliance Semiconductor Corporation 2575, Augustine Drive, Santa Clara, CA 95054 Tel: 408 - 855 - 4900 Fax: 408 - 855 - 4999 www.alsc.com Copyright © Alliance Semiconductor All Rights Reserved Part Number:ASM705 / 706 / 707 / 708 ASM813L Document Version: 1.5 © Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are tr ademarks or registered trademarks of Alliance. All other brand and product names may be the trademarks of their respective companies. Allia nce reserves the right to make changes to this document and its products at any time without notice. Alliance assumes no responsibility for any errors that may appear in this document. The data contained herein represents Al liance's best data and/or estimates at the time of issuance. Al liance reserves the right to change or correct this data at any time, without notice. If the product described herein is under development, signifi cant changes to these specifications are possible. The information in this product data sheet is intended to be general descriptive information for p otential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or customer. Alliance does not assume any responsibility or liability arising out of the application or use of any prod uct described herein, and disclaims any express or implied warran ties related to the sale and/or use of Alliance products including liability or warrant ies related to fitness for a particular purpose, merchantability, or infringement of any intellectual property rights, except as express agreed to in Al liance's Terms and Conditions of Sale (which are available from Alliance). All sales of Alliance products are made exclusively accord ing to Alliance's Terms and Conditions of Sale. The purchase of products from Alli ance does not convey a license under any patent rights, copyrights; mask work s rights, trademarks, or any other intellectual property rights of Alliance or third parties. Alliance does not authorize its products for use as crit ical components in life-supporti ng systems where a malfunction or failure may reasonably be expected to result in significant injury to the user, and the inclusio n of Alliance products in such life-support ing systems implies that the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use. ASM705 / 706 / 707 / 708 ASM813L