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PHILIPS PCF1252-X family Threshold detector reset generator Data Sheet

1. typ 0 6 V gt ay POWF A 4 __ ov undefined output gt reset lt reset lt RESET SELECT Vss A m OV undefined TE pA a aa tp i MGC917 output tr reset time duration of reset pulse ts save time time between assertion of POWF and assertion of the reset output This time can be used for storing of critical data and orderly system shut down Vhys hysteresis voltage prevents oscillation around VyRip Fig 3 Timing diagram 1998 Apr 16 6 Philips Semiconductors Threshold detector and reset generator Typical performance characteristics Product specification PCF1252 X family MGC918 Vpp 5 V COMIN Vpp 80 120 Tamb C Fig 4 Supply current as a function of temperature MGC919 12 IDD WA VTRIP 8 2 55 V 4 75V 4 0 0 2 4 8 Vpp V Fig 5 Supply current as a function of the supply voltage Tamb 25 C MGC920 output voltage 40 lo Vop mA 6V 30 20 4 0 V 10 2 5V 0 0 2 4 6 8 Vo W Fig 6 Output sink current as a function of the MGC921 40 lo VDD 6V mA 30 20 4 0 V 10 2 5 V 0 0 2 6 Fig 7 Output source current as a function of the output voltage 199
2. DEFINITIONS Data sheet status Objective specification This data sheet contains target or goal specifications for product development Preliminary specification This data sheet contains preliminary data supplementary data may be published later Product specification This data sheet contains final product specifications Limiting values Limiting values given are in accordance with the Absolute Maximum Rating System IEC 134 Stress above one or more of the limiting values may cause permanent damage to the device These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied Exposure to limiting values for extended periods may affect device reliability Application information Where application information is given it is advisory and does not form part of the specification LIFE SUPPORT APPLICATIONS These products are not designed for use in life support appliances devices or systems where malfunction of these products can reasonably be expected to result in personal injury Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale 1998 Apr 16 13 Philips Semiconductors Product specification Threshold detector and reset generator PCF1252 X family NOTES
3. MICROPROCESSOR Vss Vss V SS I MGC925 1 For external reset application the SELECT input must be debounced Fig 11 Data retention circuit with external switchable reset for systems with a single voltage supply 1998 Apr 16 9 Philips Semiconductors Product specification Threshold detector and reset generator PCF1252 X family PACKAGE OUTLINES DIP8 plastic dual in line package 8 leads 300 mil SOT97 1 seating plane 5 scale DIMENSIONS inch dimensions are derived from the original mm dimensions A A2 1 1 max in max by b2 D E UNIT 9 8 6 48 9 2 6 20 0 39 0 26 0 36 0 24 mm 4 2 3 2 inches 0 17 0 13 Note 1 Plastic or metal protrusions of 0 25 mm maximum per side are not included OUTLINE REFERENCES EUROPEAN VERSION IEC JEDEC EIAJ PROJECTION SOT97 1 050G01 MO 001AN E cas J ISSUE DATE 1998 Apr 16 10 Philips Semiconductors Product specification Threshold detector and reset generator PCF1252 X family SO8 plastic small outline package 8 leads body width 3 9 mm SOT96 1 pin 1 index f n a gt detail X 2 5 scale DIMENSIONS inch d
4. 1998 Apr 16 14 Philips Semiconductors Product specification Threshold detector and reset generator PCF1252 X family NOTES 1998 Apr 16 15 Philips Semiconductors Argentina see South America Australia 34 Waterloo Road NORTH RYDE NSW 2113 Tel 61 2 9805 4455 Fax 61 2 9805 4466 Austria Computerstr 6 A 1101 WIEN P O Box 213 Tel 43 160 1010 Fax 43 160 101 1210 Belarus Hotel Minsk Business Center Bld 3 r 1211 Volodarski Str 6 220050 MINSK Tel 375 172 200 733 Fax 375 172 200 773 Belgium see The Netherlands Brazil see South America Bulgaria Philips Bulgaria Ltd Energoproject 15th floor 51 James Bourchier Blvd 1407 SOFIA Tel 359 2 689 211 Fax 359 2 689 102 Canada PHILIPS SEMICONDUCTORS COMPONENTS Tel 1 800 234 7381 China Hong Kong 501 Hong Kong Industrial Technology Centre 72 Tat Chee Avenue Kowloon Tong HONG KONG Tel 852 2319 7888 Fax 852 2319 7700 Colombia see South America Czech Republic see Austria Denmark Prags Boulevard 80 PB 1919 DK 2300 COPENHAGEN S Tel 45 32 88 2636 Fax 45 31 57 0044 Finland Sinikalliontie 3 FIN 02630 ESPOO Tel 358 9 615800 Fax 358 9 61580920 France 51 Rue Carnot BP317 92156 SURESNES Cedex Tel 33 1 40 99 6161 Fax 33 1 40 99 6427 Germany Hammerbrookstra e 69 D 20097 HAMBURG Tel 49 40 23 53 60 Fax 49 40 23 536 300 Greece No 15 25th March Street GR 17778 TAVROS ATHENS Tel 30 1 4894 339
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6. C WAVE SOLDERING Wave soldering techniques can be used for all SO packages if the following conditions are observed e A double wave a turbulent wave with high upward pressure followed by a smooth laminar wave soldering technique should be used e The longitudinal axis of the package footprint must be parallel to the solder flow e The package footprint must incorporate solder thieves at the downstream end During placement and before soldering the package must be fixed with a droplet of adhesive The adhesive can be applied by screen printing pin transfer or syringe dispensing The package can be soldered after the adhesive is cured Maximum permissible solder temperature is 260 C and maximum duration of package immersion in solder is 10 seconds if cooled to less than 150 C within 6 seconds Typical dwell time is 4 seconds at 250 C A mildly activated flux will eliminate the need for removal of corrosive residues in most applications REPAIRING SOLDERED JOINTS Fix the component by first soldering two diagonally opposite end leads Use only a low voltage soldering iron less than 24 V applied to the flat part of the lead Contact time must be limited to 10 seconds at up to 300 C When using a dedicated tool all other leads can be soldered in one operation within 2 to 5 seconds between 270 and 320 C Philips Semiconductors Product specification Threshold detector and reset generator PCF1252 X family
7. 40 27 82785 Fax 31 40 27 88399 New Zealand 2 Wagener Place C P O Box 1041 AUCKLAND Tel 64 9 849 4160 Fax 64 9 849 7811 Norway Box 1 Manglerud 0612 OSLO Tel 47 22 74 8000 Fax 47 22 74 8341 Pakistan see Singapore Philippines Philips Semiconductors Philippines Inc 106 Valero St Salcedo Village P O Box 2108 MCC MAKATI Metro MANILA Tel 63 2 816 6380 Fax 63 2 817 3474 Poland UI Lukiska 10 PL 04 123 WARSZAWA Tel 48 22 612 2831 Fax 48 22 612 2327 Portugal see Spain Romania see Italy Russia Philips Russia Ul Usatcheva 35A 119048 MOSCOW Tel 7 095 755 6918 Fax 7 095 755 6919 Singapore Lorong 1 Toa Payoh SINGAPORE 319762 Tel 65 350 2538 Fax 65 251 6500 Slovakia see Austria Slovenia see Italy South Africa S A PHILIPS Pty Ltd 195 215 Main Road Martindale 2092 JOHANNESBURG P O Box 7430 Johannesburg 2000 Tel 27 11 470 5911 Fax 27 11 470 5494 South America Al Vicente Pinzon 173 6th floor 04547 130 SAO PAULO SP Brazil Tel 55 11 821 2333 Fax 55 11 821 2382 Spain Balmes 22 08007 BARCELONA Tel 34 3 301 6312 Fax 34 3 301 4107 Sweden Kottbygatan 7 Akalla S 16485 STOCKHOLM Tel 46 8 5985 2000 Fax 46 8 5985 2745 Switzerland Allmendstrasse 140 CH 8027 ZURICH Tel 41 1 488 2741 Fax 41 1 488 3263 Taiwan Philips Semiconductors 6F No 96 Chien Kuo N Rd Sec 1 TAIPEI Taiwan Tel 886 2 2134 2865 Fax 886 2 2134 2874
8. 8 Apr 16 Philips Semiconductors Product specification Threshold detector and reset generator PCF1252 X family 103 MGCS2 402 ta tg 2 ms ms 10 10 10 1 1 107 1071 107 1078 107 107 1 10 10 10 external capacitor nF 1 tR typ 0 1 Cort ms 2 tg typ 0 01 0 1 Cet ms Fig 8 Reset and save times as a function of the external capacitor Cor APPLICATION INFORMATION VDD 5 V PCF1252 x VDD COMIN MICROCONTROLLER RESET MICROPROCESSOR SELECT MGC923 Vss 0 V Hi Fig 9 Typical power on reset circuit for a microcontroller microprocessor system when not used COMIN must be connected to Vpp 1998 Apr 16 8 Philips Semiconductors Product specification Threshold detector and reset generator PCF1252 X family 12V VOLTAGE REGULATOR 6 MQ PCF1252 x VDD VoD RESET INT MICROCONTROLLER MICROPROCESSOR lt 1 MQ Vss addres data bus l RAM A CHIP ie DECODING a LOGIC MGC924 77 Fig 10 Data retention circuit for memory back up systems VDD VDD external reset _ RESET A input signal 1 MICROCONTROLLER RAN
9. ER DESCRIPTION VERSION PCF1252 XP plastic dual in line package 8 leads 300 mil SOT97 1 PCF1252 XT plastic small outline package 8 leads body width 3 9 mm SOT96 1 Note 1 X 0 to 9 depending on threshold voltage BLOCK DIAGRAM 1998 Apr 16 Vpp COMIN Yy ae 2 iy gt gt ise comparator 1 PCF1252 X H gt 7 gt POWF gt RESET MGC915 Vss CT SELECT Fig 1 Block diagram Philips Semiconductors Threshold detector and reset generator PINNING Product specification PCF1252 X family SYMBOL PIN DESCRIPTION connection for the external capacitor select polarity or external reset input COMIN comparator input Vss ground 0 V COMOUT 5 comparator output POWF 7 power failure signal output VDpp 8 supply voltage U CT VDD SELECT POWF PCF1252 X COMIN RESET Vss COMOUT MGC916 Fig 2 Pinning diagram FUNCTIONAL DESCRIPTION see Fig 1 The PCF1252 X contains e A precise factory programmed voltage reference e Two comparators e A delay circuit The PCF1252 X family is comprised of 10 versions with different factory programmed voltage trip points VTRIP see Chapter Characteristics Supply The supply voltage Vpp is internally divided before being compared via comparator 1 with the internal reference voltage POWF see Fig 3 The POWF output is e LOW
10. O O PCF1252 X family O 0 INTEGRATED CIRCUITS DATA SHEET PCF1252 X family Threshold detector and reset generator Product specification 1998 Apr 16 Supersedes data of 1996 Jan 23 File under Integrated Circuits 1C11 Philips PHILIPS Semiconductors DH LI p Philips Semiconductors Product specification Threshold detector and reset generator PCF1252 X family FEATURES GENERAL DESCRIPTION e Very low current consumption typically 10 uA The PCF1252 Xs are low power CMOS voltage threshold e 10 factory programmed threshold voltages available detectors designed especially for supervision of _ covering trip voltages from 4 75 to 2 55 V microcontroller microprocessor systems for detection of Variable RESET delay RESET pulse polarity selection Defined outputs at 0 6 V typ e g overvoltage detection Advance warning of power fail ORDERING INFORMATION 50 mV trip point accuracy over full temperature range power on off conditions and generation of a system reset pulse The PCF1252 X also provides a POWF power fail output which is activated at a precise factory programmed trip point A system RESET output has a built in delay with duration determined by an external capacitor Cer Comparator for second level detection A second comparator comparator 2 has been included to enable the possibility of a second monitoring point in the system Operating temperature range 40 to 85 C PACKAGE TYPE NUMB
11. TYP MAX 2 4 6 0 Tamb 25 C note 1 Tamb 25 C Voo Vtrip 0 5 V COMIN Vpp see Figs 4 and 5 100 x 10 6 400 x 10 6 lt lt lt lt cc cccc 1998 Apr 16 voltage trip point hysteresis 30 50 Philips Semiconductors Product specification Threshold detector and reset generator PCF1252 X family SYMBOL PARAMETER CONDITIONS COMIN COMIN switch point Tamb 25 C note 1 1 28 Vsp AVsp COMIN switch point temperature note 2 0 1 0 5 mV K coefficient SELECT Vit LOW level input voltage 0 3Vpp Vin HIGH level input voltage 0 7Vpp SELECT and COMIN lu LOW level leakage input current 1 0 POWF RESET and COMOUT output sink current output source current us Cint CT internal capacitance 100 pF Notes 1 Long time stability of COMIN switch point Vsp and voltage trip point Vtpip within 10 years of continuous operation at Vppimax and an average operating temperature of 55 C the drift of Vsp will not exceed 10 mV The maximum drift for Vtpip will not exceed VTRIP typ VsP typ 10 mV 2 Values given per degree Kelvin tested on a sample basis 3 Conformance to these specifications is only guaranteed if the slew rate of Vpp is less than 25 V ms 1998 Apr 16 5 Philips Semiconductors Product specification Threshold detector and reset generator PCF1252 X family supply voltage
12. Thailand PHILIPS ELECTRONICS THAILAND Ltd 209 2 Sanpavuth Bangna Road Prakanong BANGKOK 10260 Tel 66 2 745 4090 Fax 66 2 398 0793 Turkey Talatpasa Cad No 5 80640 GULTEPE ISTANBUL Tel 90 212 279 2770 Fax 90 212 282 6707 Ukraine PHILIPS UKRAINE 4 Patrice Lumumba str Building B Floor 7 252042 KIEV Tel 380 44 264 2776 Fax 380 44 268 0461 United Kingdom Philips Semiconductors Ltd 276 Bath Road Hayes MIDDLESEX UB3 5BxX Tel 44 181 730 5000 Fax 44 181 754 8421 United States 811 East Arques Avenue SUNNYVALE CA 94088 3409 Tel 1 800 234 7381 Uruguay see South America Vietnam see Singapore Yugoslavia PHILIPS Trg N Pasica 5 v 11000 BEOGRAD Tel 381 11 625 344 Fax 381 11 635 777 Internet http www semiconductors philips com SCA59 All rights are reserved Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner The information presented in this document does not form part of any quotation or contract is believed to be accurate and reliable and may be changed without notice No liability will be accepted by the publisher for any consequence of its use Publication thereof does not convey nor imply any license under patent or other industrial or intellectual property rights Printed in The Netherlands 295102 1200 03 pp16 Philips Semiconductors Date of release 1998 Apr 16 Document order number 9397 750 03645 Lott make thing
13. ge at COMIN e COMOUT HIGH if voltage at COMIN is above the switch point Vsp typically 1 30 V e COMOUT LOW if voltage at COMIN is below the switch point Vsp typically 1 30 V Philips Semiconductors Threshold detector and reset generator LIMITING VALUES In accordance with the Absolute Maximum Rating System IEC 134 Product specification PCF1252 X family SYMBOL PARAMETER CONDITIONS 0 5 MIN 7 0 MAX V UNIT Vpp supply voltage VI input voltage li lo output current Prot DC clamp diode current total power dissipation all pins V lt 0 5 V or VI gt Vpp 0 5V 0 5 Vpp 0 5 V m m m Tstg Tamb storage temperature operating ambient temperature 20 85 A z A 150 Ww 65 100 C 40 C HANDLING Inputs and outputs are protected against electrostatic discharge in normal handling However to be totally safe it is desirable to take normal handling precautions appropriate to handling MOS devices see Handling MOS Devices CHARACTERISTICS Vpn 2 4 to 6 0 V Vss 0 V Tamb 40 to 85 C see Fig 3 unless otherwise specified SYMBOL PARAMETER Vpop supply voltage Voltage trip point PCF1252 0 PCF1252 1 PCF1252 2 PCF1252 3 PCF1252 4 PCF1252 5 PCF1252 6 PCF1252 7 PCF1252 8 PCF1252 9 supply current voltage trip point temperature coefficient CONDITIONS MIN
14. if Vpp is below VTRIP e HIGH if Vpp is above Vrtrip Power on reset SELECT LOW As Vpp rises past Vtrip a positive reset pulse is generated at RESET The duration of the reset pulse tp is determined by the value of the external capacitor Cer maximum 1 uF see Fig 8 connected to CT With no external capacitor connected Cor assumes a minimum value of 100 pF If SELECT is HIGH the reset pulse is inverted Power failure During a power off condition Vpp lt Vtrip POWF goes LOW After a time delay ts also determined by Cor RESET goes HIGH Any POWF assertion Vpp lt Vtrip will result in a subsequent RESET pulse 1998 Apr 16 Voltage trip point By selecting the voltage trip point slightly higher than the minimum operating voltage of the microcontroller microprocessor there is sufficient time for data storage before the power actually fails In order to prevent oscillations around the voltage trip point a small hysteresis has been included resulting in a power on switching point that is higher than the voltage trip point minimum of 15 mV The voltage trip point refers to the value at which power off is signalled COMIN Input to the second comparator comparator 2 When used in conjunction with an external voltage divider this allows a second point in the system to be monitored This input has no built in hysteresis When not in use connect to Vpp COMOUT will be LOW or HIGH depending on the volta
15. ime of successive solder waves must not exceed 5 seconds The device may be mounted up to the seating plane but the temperature of the plastic body must not exceed the specified maximum storage temperature T stg max If the printed circuit board has been pre heated forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit REPAIRING SOLDERED JOINTS Apply a low voltage soldering iron less than 24 V to the lead s of the package below the seating plane or not more than 2 mm above it If the temperature of the soldering iron bit is less than 300 C it may remain in contact for up to 10 seconds If the bit temperature is between 300 and 400 C contact may be up to 5 seconds so REFLOW SOLDERING Reflow soldering techniques are suitable for all SO packages Reflow soldering requires solder paste a suspension of fine solder particles flux and binding agent to be applied to the printed circuit board by screen printing stencilling or pressure syringe dispensing before package placement 1998 Apr 16 Product specification PCF1252 X family Several techniques exist for reflowing for example thermal conduction by heated belt Dwell times vary between 50 and 300 seconds depending on heating method Typical reflow temperatures range from 215 to 250 C Preheating is necessary to dry the paste and evaporate the binding agent Preheating duration 45 minutes at 45
16. imensions are derived from the original mm dimensions UNIT A A2 A3 c pM Ee He 0 25 5 0 4 0 6 2 0 19 4 8 3 8 5 8 ch 0 0100 0 20 0 16 nones 0 0075 0 19 0 15 Notes 1 Plastic or metal protrusions of 0 15 mm maximum per side are not included 2 Plastic or metal protrusions of 0 25 mm maximum per side are not included OUTLINE REFERENCES EUROPEAN VERSION IEC JEDEC EIAJ PROJECTION SOT96 1 076E03S MS 012AA E ee ISSUE DATE 1998 Apr 16 11 Philips Semiconductors Threshold detector and reset generator SOLDERING Introduction There is no soldering method that is ideal for all IC packages Wave soldering is often preferred when through hole and surface mounted components are mixed on one printed circuit board However wave soldering is not always suitable for surface mounted ICs or for printed circuits with high population densities In these situations reflow soldering is often used This text gives a very brief insight to a complex technology A more in depth account of soldering ICs can be found in our Data Handbook IC26 Integrated Circuit Packages order code 9398 652 90011 DIP SOLDERING BY DIPPING OR BY WAVE The maximum permissible temperature of the solder is 260 C solder at this temperature must not be in contact with the joint for more than 5 seconds The total contact t
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PHILIPS PCF1252-X family Threshold detector reset generator Data Sheet

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