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microprocessor supervisory circuit adm1232 rev. c information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ?1997C2008 analog devices, inc. all rights reserved. features pin-compatible with max1232 and dallas ds1232 adjustable precision voltage monitor with 4.5 v and 4.75 v options adjustable strobe monitor with 150 ms, 600 ms, or 1.2 sec options no external components specified from ?40c to +85c applications microprocessor systems portable equipment computers controllers intelligent instruments automotive systems functional block diagram v cc t olerance pb reset td 5%/10% tolerance select reset generator reset gnd debounce vref reset watchdog timer watchdog time-base select strobe 7522-001 adm1232 0 figure 1. general description the adm1232 is pin-compatible with the max1232, ds1232lp, and ds1232. the analog devices, inc., adm1232 is a micro- processor monitoring circuit that can monitor the following: ? microprocessor supply voltage ? whether a microprocessor has locked up ? external interrupts the adm1232 is available in four packages: an 8-lead msop (rm-8), an 8-lead pdip (n-8), a 16-lead wide soic (rw-16), and an 8-lead narrow soic (r-8). microprocessor gnd td tolerance reset strobe reset i/o adm1232 5 v 5 v 10k? 07522-002 figure 2. typical supply monitoring application
adm1232 rev. c | page 2 of 1 2 table of contents features .............................................................................................. 1 ? applications ....................................................................................... 1 ? functional block diagram .............................................................. 1 ? general description ......................................................................... 1 ? revision history ............................................................................... 2 ? specifications ..................................................................................... 3 ? absolute maximum ratings ............................................................ 4 ? thermal resistance ...................................................................... 4 ? esd caution .................................................................................. 4 ? pin configurations and function descriptions ............................5 ? circuit information ...........................................................................6 ? pb reset .......................................................................................6 ? strobe timeout selection .........................................................6 ? tolerance ........................................................................................6 ? reset and reset outputs .........................................................6 ? outline dimensions ..........................................................................7 ? ordering guide .............................................................................9 ? revision history 12/08rev. b to rev. c updated format .................................................................. universal changes to table 2 ............................................................................ 4 added thermal resistance section ............................................... 4 updated outline dimensions ......................................................... 7 changes to ordering guide ............................................................ 9 12/97rev. a to rev. b changes to specifications section .................................................. 2 x/97rev. 0 to rev. a changes to specifications section .................................................. 2 7/97revision 0: initial version
adm1232 rev. c | page 3 of 12 specifications v cc = full operating range, t a = t min to t max , unless otherwise noted. table 1. parameter min typ max unit test conditions/comments temperature ?40 +85 c t a = t min to t max . power supply voltage 4.5 5.0 5.5 v current 20 50 a v il , v ih = cmos levels. 200 500 a v il , v ih = ttl levels. strobe and pb reset inputs input high level 2.0 v cc + 0.3 v input low level ?0.3 +0.8 v input leakage current ( strobe , tolerance) ?1.0 +1.0 a td 1.6 a output current reset 8 10 ma v cc is at 4.5 v to 5.5 v. reset /reset ?8 ?12 ma v cc is at 4.5 v to 5.5 v. output voltage reset /reset v cc ? 0.5 v cc ? 0.1 v when sourcing less than 500 a, reset remains within 0.5 v of v cc on power-down until v cc drops below 2.0 v. when sinking less than 500 a, reset remains within 0.5 v of gnd on power-down until v cc drops below 2.0 v. reset /reset high level 0.4 v reset /reset low level 2.4 v 1 v operation reset output voltage v cc ? 0.1 v when sourcing less than 50 a. reset output voltage 0.1 v when sinking less than 50 a. v cc trip point 5% 4.5 4.62 4.74 v tolerance = gnd. 10% 4.25 4.37 4.49 v tolerance = v cc . capacitance input ( strobe , tolerance) 5 pf t a = 25c. output (reset, reset ) 7 pf t a = 25c. pb reset time 20 ms pb reset must be held low for a minimum of 20 ms to guarantee a reset. delay 1 4 20 ms reset active time 250 610 1000 ms strobe pulse width 70 ns timeout period 62.5 150 250 ms td = 0 v. 250 600 1000 ms td = floating. 500 1200 2000 ms td = v cc . v cc fall time 10 s guaranteed by design. rise time 0 s guaranteed by design. v cc fail detect to reset output delay reset and reset are logically correct. 50 s after v cc falls below the set tolerance voltage (see figure 9 ). 250 610 1000 ms after v cc rises above the set tolerance voltage.
adm1232 rev. c | page 4 of 12 absolute maximum ratings thermal resistance t a = 25c unless otherwise noted. table 2. parameter rating v cc 5.5 v logic inputs ?0.3 v to v cc + 0.3 v storage temperature range ?65c to +150c lead temperature (soldering, 10 sec) 300c vapor phase (60 sec) 215c infrared (15 sec) 220c power dissipation n-8 1 1000 mw rw-16, rm-8 2 900 mw r-8 2 900 w ja is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. table 3. thermal resistance package type ja unit 8-lead pdip (n-8) 100 c/w 16-lead soic_w (rw-16) 73 c/w 8-lead msop (rm-8) 206 c/w 8-lead soic_n (r-8) 153 c/w esd caution 1 derate by 13.5 mw/c above 25c. 2 derate by 12 mw/c above 25c. stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability.
adm1232 rev. c | page 5 of 12 pin configurations and function descriptions nc 1 pb reset 2 nc 3 td 4 nc 16 v cc 15 nc 14 strobe 13 nc 5 nc 12 t olerance 6 reset 11 nc 7 nc 10 gnd 8 reset 9 nc = no connect adm1232 top view (not to scale) 0752 2-003 adm1232 top view (not to scale) figure 3. rw-16 pin configuration pb reset 1 v cc 8 td 2 strobe 7 tolerance 3 reset 6 gnd 4 reset 5 0752 2-004 figure 4. rm-8 pin configuration pb reset 1 td 2 tolerance 3 gnd 4 v cc 8 strobe 7 reset 6 adm1232 top view (not to scale) reset 5 07522-005 figure 5. n-8 and r-8 pin configuration table 4. pin function descriptions pin o. mnemonic description rw-16 n-8, r-8, rm-8 1, 3, 5, 7, 10, 12, 14, 16 nc no connection. 2 1 pb reset push-button reset input. this debounced inpu t ignores pulses of less than 1 ms and is guaranteed to respond to pulses greater than 20 ms. 4 2 td time delay set. this input allows the user to select the maximum amount of time that the adm1232 allows the strobe input to remain inactivethat is, strobe is not receiving any high-to-low transitionswithout forcing the adm1232 to generate a reset pulse. see the section, , and the specifications figure 8 strobe timeout selection section. 6 3 tolerance tolerance input. this input determines how much the supply voltage is allowed to decrease (as a percentage) before a reset is asserted. connect this pin to v cc for 10% and to gnd for 5%. 8 4 gnd 0 v ground reference for all signals. 9 5 reset active high logic output. this pin is asserted when any of the following events occurs: v cc decreases below the amount specified by the tolerance input; when pb reset is forced low; if there are no high-to-low transiti ons within the limits set by td at strobe ; and during power-up. 11 6 reset inverse of reset. this pin has an open-drain output. 13 7 strobe the strobe input is used to monitor the activity of a microprocessor. if there are no high-to-low transitions within the time specified by td, a reset is asserted. 15 8 v cc power supply input, 5 v.
adm1232 rev. c | page 6 of 12 circuit information pb reset strobe timeout selection the pb reset input makes it possible to manually reset a system using either a standard push-button switch or a logic low input. an internal debounce circuit provides glitch immunity when used with a switch, reducing the effects of glitches on the line. the debounce circuit is guaranteed to cause the adm1232 to assert a reset if pb reset is brought low for more than 20 ms and is guaranteed to ignore low inputs of less than 1 ms. td (time delay) set is used to set the strobe timeout period. the strobe timeout period is the maximum time between high-to- low transitions that strobe accepts before a reset is asserted (see ). the strobe timeout settings are listed in . figure 8 table 5 table 5. strobe timeout settings condition min typ max unit td = 0 v 62.5 150 250 ms td = floating 250 600 1000 ms td = v cc 500 1200 2000 ms microprocessor gnd tolerance reset strobe reset pb reset i/o adm1232 v cc v cc td strobe pulse width strobe timeout period strobe 07522-008 07522-0 reset 06 figure 8. strobe parameters figure 6. typical push-button reset application reset pb reset v il reset active time pb reset delay pb reset time v ih 07 5v v cc reset 5v 4.5v (5% trip point) reset output delay hen v cc is falling reset output delay when v cc is rising w 4.25v (10% trip point) re set 07522-009 figure 9. reset output delay 07522-0 tolerance figure 7. pb reset the tolerance input is used to determine the level at which v cc can vary below 5 v without the adm1232 asserting a reset. connecting tolerance to gnd selects a ?5% tolerance level and causes the adm1232 to generate a reset if v cc falls below 4.75 v. if tolerance is connected to v cc , a ?10% tolerance level is selected, which causes the adm1232 to generate a reset if v cc falls below 4.5 v. see the parameters for the v cc trip point in the specifications section for more information. reset and reset outputs reset is capable of sourcing and sinking current, whereas reset is an open-drain mosfet that sinks current only. therefore, it is necessary to pull this output high.
adm1232 rev. c | page 7 of 12 controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design. compliant to jedec standards ms-013- aa 032707-b 10.50 (0.4134) 10.10 (0.3976) outline dimensions 0.30 (0.0118) 0.10 (0.0039) 2.65 (0.1043) 2.35 (0.0925) 10.65 (0.4193) 10.00 (0.3937) 7.60 (0.2992) 7.40 (0.2913) 0 . 7 5 ( 0 . 0 2 9 5 ) 0 . 2 5 ( 0 . 0 0 9 8 ) 45 1.27 (0.0500) 0.40 (0.0157) c oplanarity 0.10 0. 33 (0.0130) 0.20 (0.0079) 0.51 (0.0201) 0.31 (0.0122) seating plane 8 0 16 9 8 1 1.27 (0.0500) bsc figure 10. 16-lead standard small outline package [soic_w] wide body (rw-16) dimensions shown in millimeters and (inches) 0.80 0.60 0.40 8 0 4 8 1 5 pin 1 0.65 bsc seating plane 0.38 0.22 1.10 max 3.20 3.00 2.80 compliant to jedec standards mo-187-aa coplanarity 0.10 0.23 0.08 3.20 3.00 2.80 5.15 4.90 4.65 0.15 0.00 0.95 0.85 0.75 figure 11. 8-lead mini small outline package [msop] (rm-8) dimensions shown in millimeters
adm1232 rev. c | page 8 of 12 compliant to jedec standards ms-001 controlling dimensions are in inches; millimeter dimensions (in parentheses) are rounded-off inch equivalents for reference only and are not appropriate for use in design. corner leads may be configured as whole or half leads. 070606-a 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) seating plane 0.015 (0.38) min 0.210 (5.33) max 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) 0.070 (1.78) 0.060 (1.52) 0.045 (1.14) 8 1 4 5 0.280 (7.11) 0.250 (6.35) 0.240 (6.10) 0.100 (2.54) bsc 0.400 (10.16) 0.365 (9.27) 0.355 (9.02) 0.060 (1.52) max 0.430 (10.92) max 0.014 (0.36) 0.010 (0.25) 0.008 (0.20) 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.195 (4.95) 0.130 (3.30) 0.115 (2.92) 0.015 (0.38) gauge plane 0.005 (0.13) min figure 12. 8-lead plastic dual in-line package [pdip] narrow body (n-8) dimensions shown in inches and (millimeters) controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design. compliant to jedec standards ms-012-a a 012407-a 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) 0.50 (0.0196) 0.25 (0.0099) 45 8 0 1.75 (0.0688) 1.35 (0.0532) seating plane 0.25 (0.0098) 0.10 (0.0040) 4 1 85 5.00 (0.1968) 4.80 (0.1890) 4.00 (0.1574) 3.80 (0.1497) 1.27 (0.0500) bsc 6.20 (0.2441) 5.80 (0.2284) 0.51 (0.0201) 0.31 (0.0122) coplanarity 0.10 figure 13. 8-lead standard small outline package [soic_n] narrow body (r-8) dimensions shown in millimeters and (inches)
adm1232 rev. c | page 9 of 12 ordering guide model temperature range package description package options branding adm1232arm ?40c to +85c 8-lead mini small outline package [msop] rm-8 m2a adm1232arm-reel ?40c to +85c 8-lead mini small outline package [msop] rm-8 m2a adm1232arm-reel7 ?40c to +85c 8-lead mini small outline package [msop] rm-8 m2a adm1232armz 1 ?40c to +85c 8-lead mini small outline package [msop] rm-8 m4w adm1232armz-reel 1 ?40c to +85c 8-lead mini small outline package [msop] rm-8 m4w adm1232armz-reel7 1 ?40c to +85c 8-lead mini small outline package [msop] rm-8 m4w adm1232an ?40c to +85c 8-lead plastic dual in-line package [pdip] n-8 adm1232anz 1 ?40c to +85c 8-lead plastic dual in-line package [pdip] n-8 adm1232arw ?40c to +85c 16-lead standard sma ll outline package [soic_w], wide body rw-16 adm1232arw-reel ?40c to +85c 16-lead standard sm all outline package [soic_w], wide body rw-16 adm1232arw-reel7 ?40c to +85c 16-lead standard sm all outline package [soic_w], wide body rw-16 adm1232arwz 1 ?40c to +85c 16-lead standard small outl ine package [soic_w], wide body rw-16 adm1232arwz-reel 1 ?40c to +85c 16-lead standard small outl ine package [soic_w], wide body rw-16 adm1232arwz-reel7 1 ?40c to +85c 16-lead standard small outl ine package [soic_w], wide body rw-16 adm1232arn ?40c to +85c 8-lead standard small outline package [soic_n] r-8 adm1232arn-reel ?40c to +85c 8-lead stan dard small outline package [soic_n] r-8 adm1232arn-reel7 ?40c to +85c 8-lead standard small outline package [soic_n] r-8 adm1232arnz 1 ?40c to +85c 8-lead standard small outline package [soic_n] r-8 adm1232arnz-reel 1 ?40c to +85c 8-lead standard small outline package [soic_n] r-8 ADM1232ARNZ-REEL7 1 ?40c to +85c 8-lead standard small outline package [soic_n] r-8 1 z = rohs compliant part.
adm1232 rev. c | page 10 of 1 2 notes
adm1232 rev. c | page 11 of 1 2 notes
adm1232 rev. c | page 12 of 12 notes ?1997C2008 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d07522-0-12/08(c)

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