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d a t a sh eet product speci?cation supersedes data of 1996 jan 23 file under integrated circuits, ic11 1998 apr 16 integrated circuits pcf1252-x family threshold detector and reset generator
1998 apr 16 2 philips semiconductors product speci?cation threshold detector and reset generator pcf1252-x family features very low current consumption, typically 10 m a 10 factory programmed threshold voltages available covering trip voltages from 4.75 to 2.55 v 50 mv trip point accuracy over full temperature range variable reset delay reset pulse polarity selection defined outputs at 0.6 v (typ.) comparator for second level detection (e.g. overvoltage detection) advance warning of power fail operating temperature range - 40 to +85 c. general description the pcf1252-xs are low-power cmos voltage threshold detectors designed especially for supervision of microcontroller/microprocessor systems for detection of 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 (c ct ). a second comparator (comparator 2) has been included to enable the possibility of a second monitoring point in the system. ordering information note 1. x = 0 to 9; depending on threshold voltage. block diagram type number package name description version pcf1252-xp (1) dip8 plastic dual in-line package; 8 leads (300 mil) sot97-1 pcf1252-xt (1) so8 plastic small outline package; 8 leads; body width 3.9 mm sot96-1 fig.1 block diagram. handbook, full pagewidth + - + - comin comparator 2 83 5 pcf1252-x 7 6 1 ct select reset powf comout mgc915 1.30 v 42 comparator 1 delay v dd v ss
1998 apr 16 3 philips semiconductors product speci?cation threshold detector and reset generator pcf1252-x family pinning symbol pin description ct 1 connection for the external capacitor select 2 select polarity or external reset input comin 3 comparator input v ss 4 ground (0 v) comout 5 comparator output reset 6 reset output powf 7 power failure signal output v dd 8 supply voltage fig.2 pinning diagram. handbook, halfpage 1 2 3 4 ct select comin v ss v dd powf reset comout 8 7 6 5 mgc916 pcf1252-x functional description (see fig.1) the pcf1252-x contains: a precise factory-programmed voltage reference two comparators a delay circuit. the pcf1252-x family is comprised of 10 versions with different factory-programmed voltage trip-points (v trip ), see chapter characteristics. supply the supply voltage (v dd ) is internally divided before being compared, via comparator 1, with the internal reference voltage. powf (see fig.3) the powf output is: low, if v dd is below v trip high, if v dd is above v trip . power-on reset (select = low) as v dd rises past v trip , a positive reset pulse is generated at reset. the duration of the reset pulse (t r ) is determined by the value of the external capacitor (c ct ; maximum 1 m f, see fig.8) connected to ct. with no external capacitor connected, c ct assumes a minimum value of 100 pf. if select is high, the reset pulse is inverted. power failure during a power-off condition (v dd 1998 apr 16 4 philips semiconductors product speci?cation threshold detector and reset generator pcf1252-x family limiting values in accordance with the absolute maximum rating system (iec 134). 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 v dd = 2.4 to 6.0 v; v ss =0v; t amb = - 40 to +85 c; (see fig.3); unless otherwise speci?ed. symbol parameter conditions min. max. unit v dd supply voltage - 0.5 +7.0 v v i input voltage - 0.5 v dd + 0.5 v i i dc clamp-diode current all pins: v i < - 0.5 v or v i >v dd + 0.5 v - 20 ma i o output current - 20 ma p tot total power dissipation - 150 mw t stg storage temperature - 65 +100 c t amb operating ambient temperature - 40 +85 c symbol parameter conditions min. typ. max. unit v dd supply voltage 2.4 - 6.0 v v trip voltage trip-point: t amb =25 c; note 1 pcf1252-0 4.70 4.75 4.80 v pcf1252-1 4.50 4.55 4.60 v pcf1252-2 4.20 4.25 4.30 v pcf1252-3 4.00 4.05 4.10 v pcf1252-4 3.70 3.75 3.80 v pcf1252-5 3.50 3.55 3.60 v pcf1252-6 3.20 3.25 3.30 v pcf1252-7 3.00 3.05 3.10 v pcf1252-8 2.70 2.75 2.80 v pcf1252-9 2.50 2.55 2.60 v i dd supply current t amb =25 c; v dd =v trip + 0.5 v; comin = v dd ; see figs. 4 and 5 - 10 15 m a d v trip voltage trip-point temperature coef?cient note 2 - 100 10 - 6 400 10 - 6 mv/k v hys voltage trip-point hysteresis 15 30 50 mv
1998 apr 16 5 philips semiconductors product speci?cation threshold detector and reset generator pcf1252-x family notes 1. long time stability of comin switch point v sp and voltage trip point v trip : within 10 years of continuous operation at v dd(max) and an average operating temperature of 55 c the drift of v sp will not exceed 10 mv. the maximum drift for v trip will not exceed ( v trip(typ) /v sp(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 v dd is less than 25 v/ms. comin v sp comin switch point t amb =25 c; note 1 1.28 1.30 1.32 v d v sp comin switch point temperature coef?cient note 2 - 0.1 0.5 mv/k select v il low level input voltage -- 0.3v dd v v ih high level input voltage 0.7v dd -- v select and comin i li low level leakage input current -- - 1.0 m a i li high level leakage input current -- 1.0 m a powf, reset and comout i o output sink current v o = 0.4 v; v dd = 2.4 v; see fig.6 13 - ma i o output source current v o = 2.0 v; v dd = 2.4 v; see fig.7 - 0.75 - 2 - ma t r reset time c ct = 1 nf; note 3 400 1000 2000 m s t s save time c ct = 1 nf; note 3 40 100 200 m s t r /t s reset to save time ratio - 10 - c int ct internal capacitance - 100 - pf symbol parameter conditions min. typ. max. unit
1998 apr 16 6 philips semiconductors product speci?cation threshold detector and reset generator pcf1252-x family fig.3 timing diagram. handbook, full pagewidth supply voltage typ. = 0.6 v undefined output undefined output powf reset t r t s t r reset 0 v mgc917 0 v 0 v v dd v hys v trip reset (select = v ss ) t r = reset time (duration of reset pulse). t s = 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. v hys = hysteresis voltage (prevents oscillation around v trip ).
1998 apr 16 7 philips semiconductors product speci?cation threshold detector and reset generator pcf1252-x family typical performance characteristics fig.4 supply current as a function of temperature; v dd = 5 v; comin = v dd . handbook, halfpage - 40 0 40 120 14 12 ( m a) 8 6 10 i dd mgc918 80 t amb ( o c) 4.75 v v trip = 2.55 v fig.5 supply current as a function of the supply voltage; t amb = +25 c. handbook, halfpage 0 12 8 4 0 24 8 mgc919 6 v dd (v) ( m a) i dd 4.75 v v trip = 2.55 v fig.6 output sink current as a function of the output voltage. handbook, halfpage 024 8 40 i o 30 (ma) 10 0 20 mgc920 6 v o (v) 6 v 2.5 v v dd = 4.0 v fig.7 output source current as a function of the output voltage. handbook, halfpage 0246 40 30 10 0 20 mgc921 i o (ma) v o (v) 2.5 v v dd = 6 v 4.0 v
1998 apr 16 8 philips semiconductors product speci?cation threshold detector and reset generator pcf1252-x family fig.8 reset and save times as a function of the external capacitor (c ct ). (1) t r (typ.) = (0.1 + c ct ) ms. (2) t s (typ.) = (0.01 + 0.1 c ct ) ms. handbook, full pagewidth 10 - 1 10 - 1 10 10 2 10 3 10 - 1 10 2 10 2 10 3 10 1 10 - 2 10 - 2 10 - 3 1 external capacitor (nf) mgc922 1 10 (ms) t r (1) (ms) t s (2) application information fig.9 typical power-on reset circuit for a microcontroller/microprocessor system; (when not used, comin must be connected to v dd ). handbook, full pagewidth microcontroller/ microprocessor v dd v dd v dd reset mgc923 reset comin pcf1252-x select v ss v ss v ss ct (0 v) ( + 5 v) 1 nf
1998 apr 16 9 philips semiconductors product speci?cation threshold detector and reset generator pcf1252-x family fig.10 data retention circuit for memory back-up systems. handbook, full pagewidth microcontroller/ microprocessor v dd v dd reset int mgc924 reset comin voltage regulator comout pcf1252-x select v ss v dd v ss v ss ct ram v ram addres/data bus 12 v 5 v 1 m w 6 m w 1 nf 10 m f chip- decoding logic r/w c s fig.11 data retention circuit with external switchable reset for systems with a single voltage supply. (1) for external reset application, the select input must be debounced. handbook, full pagewidth microcontroller/ microprocessor v dd v dd v dd reset ram int mgc925 reset comin pcf1252-x select external reset input signal (1) v ss v dd v ss v ss v ss ct 10 m f powf
1998 apr 16 10 philips semiconductors product speci?cation threshold detector and reset generator pcf1252-x family package outlines references outline version european projection issue date iec jedec eiaj sot97-1 92-11-17 95-02-04 unit a max. 12 b 1 (1) (1) (1) b 2 cd e e m z h l mm dimensions (inch dimensions are derived from the original mm dimensions) a min. a max. b max. w m e e 1 1.73 1.14 0.53 0.38 0.36 0.23 9.8 9.2 6.48 6.20 3.60 3.05 0.254 2.54 7.62 8.25 7.80 10.0 8.3 1.15 4.2 0.51 3.2 inches 0.068 0.045 0.021 0.015 0.014 0.009 1.07 0.89 0.042 0.035 0.39 0.36 0.26 0.24 0.14 0.12 0.01 0.10 0.30 0.32 0.31 0.39 0.33 0.045 0.17 0.020 0.13 b 2 050g01 mo-001an m h c (e ) 1 m e a l seating plane a 1 w m b 1 e d a 2 z 8 1 5 4 b e 0 5 10 mm scale note 1. plastic or metal protrusions of 0.25 mm maximum per side are not included. pin 1 index dip8: plastic dual in-line package; 8 leads (300 mil) sot97-1
1998 apr 16 11 philips semiconductors product speci?cation threshold detector and reset generator pcf1252-x family unit a max. a 1 a 2 a 3 b p cd (1) e (2) (1) eh e ll p qz y w v q references outline version european projection issue date iec jedec eiaj mm inches 1.75 0.25 0.10 1.45 1.25 0.25 0.49 0.36 0.25 0.19 5.0 4.8 4.0 3.8 1.27 6.2 5.8 1.05 0.7 0.6 0.7 0.3 8 0 o o 0.25 0.1 0.25 dimensions (inch dimensions are derived from the original mm dimensions) 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. 1.0 0.4 sot96-1 x w m q a a 1 a 2 b p d h e l p q detail x e z e c l v m a (a ) 3 a 4 5 pin 1 index 1 8 y 076e03s ms-012aa 0.069 0.010 0.004 0.057 0.049 0.01 0.019 0.014 0.0100 0.0075 0.20 0.19 0.16 0.15 0.050 0.244 0.228 0.028 0.024 0.028 0.012 0.01 0.01 0.041 0.004 0.039 0.016 0 2.5 5 mm scale so8: plastic small outline package; 8 leads; body width 3.9 mm sot96-1 95-02-04 97-05-22
1998 apr 16 12 philips semiconductors product speci?cation threshold detector and reset generator pcf1252-x family 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 s oldering 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 time 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. r epairing 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 r eflow 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. 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 c. w ave soldering wave soldering techniques can be used for all so packages if the following conditions are observed: a double-wave (a turbulent wave with high upward pressure followed by a smooth laminar wave) soldering technique should be used. the longitudinal axis of the package footprint must be parallel to the solder flow. 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. r epairing 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.
1998 apr 16 13 philips semiconductors product speci?cation threshold detector and reset generator pcf1252-x family definitions 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. data sheet status objective speci?cation this data sheet contains target or goal speci?cations for product development. preliminary speci?cation this data sheet contains preliminary data; supplementary data may be published later. product speci?cation this data sheet contains ?nal product speci?cations. 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 speci?cation 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 speci?cation.
1998 apr 16 14 philips semiconductors product speci?cation threshold detector and reset generator pcf1252-x family notes
1998 apr 16 15 philips semiconductors product speci?cation threshold detector and reset generator pcf1252-x family notes
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philips semiconductors - pip - pcf1252-x family; threshold detector and reset generator select your country consumer products professional products search philips semiconductors home product catalog buy online mysemiconductors contact products ? standard products ? asics ? catalog by function ? catalog by system ? cross-reference ? end of life information ? distributors go here! product information pcf1252-x family; threshold detector and reset generator information as of 2002-08-08 my.semiconductors.com. your personal service from philips semiconductors. please register now ! stay informed use right mouse button to download datasheet download datasheet general description features applications datasheet block diagram buy online support & tools email/translate products & packages parametrics similar products top general description the pcf1252-xs are low-power cmos voltage threshold detectors designed especially for supervision of microcontroller/microprocessor systems for detection of 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 (cct ). a second comparator (comparator 2) has been included to enable the possibility of a second monitoring point in the system. top features l very low current consumption, typically 10 a l 10 factory programmed threshold voltages available covering trip voltages from 4.75 to 2.55 v l 50 mv trip point accuracy over full temperature range l variable reset delay l reset pulse polarity selection l defined outputs at 0.6 v (typ.) l comparator for second level detection (e.g. overvoltage detection) l advance warning of power fail l operating temperature range -40 to +85 c. top applications download pdf file protecting microcontroller systems against power-supply imperfections (date 28-may-01) file:///g|/imaging/bitting/cpl_images/philipssemi...52-xfamily;thresholddetectorandresetgenerator.htm (1 of 4) [aug-28-2002 9:13:24 am]
philips semiconductors - pip - pcf1252-x family; threshold detector and reset generator top datasheet type number title publication release date datasheet status page count file size (kb) datasheet (earlier versions) pcf1252-x family threshold detector and reset generator 16-apr-98 product specification 16 90 download pdf file download top blockdiagram(s) block diagram of pcf1252- 1p/f4 top parametrics type number package operating temp.(cel) single supply(v dc ) vtrip (typ.)(v) pcf1252-1p/f4 sot97-1 (dip8) -40~85 -0.5 to 7 4.55 pcf1252-1t/f4 sot96 (so8) -40~85 -0.5 to 7 4.55 pcf1252-2p/f4 sot97-1 (dip8) -40~85 -0.5 to 7 4.25 pcf1252-2t/f4 sot96 (so8) -40~85 -0.5 to 7 4.25 pcf1252-3t/f4 sot96 (so8) -40~85 -0.5 to 7 4.05 pcf1252-4t/f4 sot96 (so8) -40~85 -0.5 to 7 3.75 pcf1252-5t/f4 sot96 (so8) -40~85 -0.5 to 7 0.55 pcf1252-6t/f4 sot96 (so8) -40~85 -0.5 to 7 3.25 pcf1252-7t/f4 sot96 (so8) -40~85 -0.5 to 7 3.05 pcf1252-8t/f4 sot96 (so8) -40~85 -0.5 to 7 2.75 pcf1252-9t/f4 sot96 (so8) -40~85 -0.5 to 7 2.55 top products, packages, availability and ordering type number north american type number ordering code (12nc) marking/packing download pdf file ic packing info package device status buy online pcf1252- 0p/f4 pcf1252- 0pn 9351 631 90112 standard marking * tube sot97-1 (dip8) full production order this product online - pcf1252- 0t/f4 pcf1252- 0td 9351 632 80112 standard marking * tube sot96 (so8) full production order this product online - pcf1252- 0td-t 9351 632 80118 standard marking * reel pack, smd, 13" sot96 (so8) full production order this product - file:///g|/imaging/bitting/cpl_images/philipssemi...52-xfamily;thresholddetectorandresetgenerator.htm (2 of 4) [aug-28-2002 9:13:24 am]
philips semiconductors - pip - pcf1252-x family; threshold detector and reset generator online pcf1252- 1p/f4 pcf1252- 1pn 9351 546 20112 standard marking * tube sot97-1 (dip8) full production order this product online - pcf1252- 1t/f4 pcf1252- 1td 9351 546 30112 standard marking * tube sot96 (so8) full production order this product online - pcf1252- 1td-t 9351 546 30118 standard marking * reel pack, smd, 13" sot96 (so8) full production order this product online - pcf1252- 2p/f4 pcf1252- 2pn 9351 632 00112 standard marking * tube sot97-1 (dip8) full production order this product online - pcf1252- 2t/f4 pcf1252- 2td 9351 632 90112 standard marking * tube sot96 (so8) full production order this product online - pcf1252- 2td-t 9351 632 90118 standard marking * reel pack, smd, 13" sot96 (so8) full production order this product online - pcf1252- 3t/f4 9351 633 00112 standard marking * tube sot96 (so8) full production - pcf1252- 4t/f4 pcf1252- 4td 9351 633 10112 standard marking * tube sot96 (so8) full production order this product online - pcf1252- 5t/f4 9351 633 20112 standard marking * tube sot96 (so8) full production - pcf1252- 6t/f4 9351 633 30112 standard marking * tube sot96 (so8) full production - pcf1252- 7t/f4 pcf1252- 7td 9351 633 40112 standard marking * tube sot96 (so8) full production order this product online - pcf1252- 7td-t 9351 633 40118 standard marking * reel pack, smd, 13" sot96 (so8) full production order this product online - pcf1252- 8t/f4 pcf1252- 8td 9351 633 50112 standard marking * tube sot96 (so8) full production order this product online - 9351 633 50118 standard marking * reel pack, smd, 13" sot96 (so8) full production - pcf1252- 9t/f4 pcf1252- 9td 9351 633 60112 standard marking * tube sot96 (so8) full production order this product online - products in the above table are all in production. some variants are discontinued; click here for information on these variants. top similar products products similar to pcf1252- x family pcf1252-x family links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. the similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category. file:///g|/imaging/bitting/cpl_images/philipssemi...52-xfamily;thresholddetectorandresetgenerator.htm (3 of 4) [aug-28-2002 9:13:24 am]
philips semiconductors - pip - pcf1252-x family; threshold detector and reset generator top support & tools download pdf file lcd drivers linecard top email/translate this product information l email this product information. l translate this product information page from english to: about this web site | copyright ? 2002 koninklijke philips n.v. all rights reserved. | privacy policy | | koninklijke philips n.v. | access to and use of this web site is subject to the following terms of use. | file:///g|/imaging/bitting/cpl_images/philipssemi...52-xfamily;thresholddetectorandresetgenerator.htm (4 of 4) [aug-28-2002 9:13:24 am]

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