SUPPLY VOLTAGE ZSM561 MONITOR ISSUE 3 JANUARY 1998 DEVICE DESCRIPTION FEATURES The Z2SM561 is a three terminal under e $08, SOT223 and TO92 packages voltage monitor circuit for use in e Power on reset generator microprocessor systems. The threshold A . . voltage of the device has been set to 4.6 volts Automatic reset generation making it ideal for 5 volt circuits. @ Low standby current . oa . e Guaranteed operation from 1 volt included in the device is a precise voltage Wid \ i reference and a comparator with built in vice SUPPIY VO! tage range hysteresis to prevent erratic operation. The @ Internal clamp diode to discharge ZSM561 features an open collector output capable of sinking at least 1OmA which only requires a single external resistor to interface to following circuits. Operation of the device is guaranteed from one volt upwards, from this fevel to the device threshold voltage the output is held law providing a power on reset function. Should the supply voltage, once established, at any time drop below the threshold level then the output again will pull low. Aiso included is a 6 volt zener diode connectad between Vcc and Gnd. With just the addition of a low cost external NPN transistor and resistor, this zener allows the ZSM561 to provide both regulator and supply monitor functions The device is available in a TO92 package for through hole applications as well as SO8 and S$OT223 for surface mount requirements. delay capacitor e@ 4.6 volt threshold for 5 volt logic @ 20mvV hysteresis prevents erratic operation APPLICATIONS Microprocessor systems Computers Computer peripherals Instrumentation Automotive Battery powered equipment * oe @8 @ SCHEMATIC DIAGRAM GndABSOLUTE MAXIMUM RATING Input Supply Voltage -Tto 7V ZSM561 Operating Junction Supply Zener Current 25mA continuous Temperature 150C Offstate Output Voltage WV Operating Temperature -40 to 85C Onstate Output Storage Temperature -65 to 150C Sink Currant(Note 1} Internally limited Power Dissipation Clamp Diode TO92 780mW Forward Currentinote 1) 100mA $0T223 2Winate 2) S08 7TBOmW(Note 2) TEST CONDITIONS . (Tamb=25C for typical values, T,,,,5=-40 to 85C for min/max values (Note3)) COMPARATOR PARAMETER SYMBOL MIN TvP. MAX. (UNITS Threshold Voltage High state output (Vcc increasing} Vin 45 4.61 4.7 Vv Threshold Voltage ' Low state output (Vcc decreasing) Va (4.5 4.59 47 Vv Hysteresis Via 0.01 0.02 0.05 V OUPUT Output sink saturation: Vou (Voc=4.0V, Isink=8-OMmA) 0.46 1.0 V iVoc=4.0V, leink=2-0MA) 0.15 0.4 Vv (Vec#1.0V, Ising=O.1MmA) 0.25 v Onstate output sink current Isink 10 20 60 mA (Vee , Qutput=4V) Offstate output leakage current lon 0.02 0.5 uA, (Veo, Output=5V) Clamp diode forward voltage Ve 0.6 1.2 1.5 Vv (l= TOMA) Propagation delay Ty 45 us (Vin 5V to 4V, R= 10k, Tamp=25C) SUPPLY ZENER Avalanche Voltage:(icc=1mA) Vv, 5.8 6 6.2 Vv Siope Resistance: (icc=15mA} R; 45 60 2 {Iec=15mA to 50mA} 21 30 Q TOTAL DEVICE Operating input voltage range(Note 5) | Ve. 1.0 to 7 Vv Quiescent current (V,,=5V) Ig 135 200 HA 4-365ZSM561 TYPICAL CHARACTERISTICS 500 : wa i 400 : 4 | 3 360 : = E # 5 i = 2 200 | = 4 2 i 2 i = & 100 2 | a 8 a 2 4 6 a 19 c 2 A 6 & te input Voltage (V) i input Voltage (V+ input Current vs. Input Voltage : Output Voltage vs. Input Voltage aan eevee on enemies x0 i Verd i Ars tak ; os 8 I = | 3 | ~ 20 | z : = | 5 } | i i = ov : . & . } 3 s o oa 0.8 42 Output Saturation Voltage (V) Lai ne Output Saturation Voltage vs. Sink Current 8G 7 H : i | aL 1 t | | : 6G to ~t t ~ i ; | <q hee he wl E y > | c { Ss 4 soe -p4 ~- = | 2 i ms 8 4 _ Af. z j a oO i i 5 7 r T L / oo AMAR 8 i A a a ae oa he oad ae Forward Vaitage {V} Clamp Diode Forward Current vs. Voltage 4-366 i 2 + 2 3 Time (ush Reset Delay TimeZSM561 TYPICAL CHARACTERISTICS 49g _ _ 50 ag 4.65 q = E % Upper Threshotd ct) co s 4.80 s zB S 20 2 Lower Threshald a 2 a 2 ABE = we 4.50 5 40 26 G 20 40 4a BD HQ a 2 a & & Ww 1 % { Cc 1 8 it Input Voitage (Vv) ! Mmperanure } Input Current vs. Input Voltage Threshold Voltage vs. Temperature Vee Threshold | seep eens gf nee nnn Voltage 7 NZ iv | | : ' Output : Le Output Undefined Note: 1. Maximum package power dissipation must be observed. 2. Maximum power dissipation for the SOT223 and SO8 packages is calculated assuming that the device is mounted on a PCB measuring 2 inches square. 3. Low duty cycle pulse techniques are used during test to maintain junction temperatures as close to ambient as possible - 4, Atime delayed reset can be accomplished with the additional Cd. 5. Operation above V, may be restricted by the supply current rating |, 4-367ZSM561 APPLICATION CIRCUITS Vee TI t R +ve Output i Reset | Microprocessof : Circuit Zz ; sappy S Zz Lo T -e | | |___. Gnd 3 Toy = RCd In (jt a ) Tpy = Time (Seconds) by THimpu) | Vin = Microprocessor ResetThreshoid ' Vin | Vin = Power Supply Voltage 3 RB ro ZTX690B Veco +ve , [ < zw 2 R Power ? Output Raset | x vee Circuit Wh ml AA i | S r uv ' ye t | 4 t Gnd i Vv; -& Ra= (Vinmin ~ 8) Uo+ a Oo hre Vinsin = The minimum input voltage provided by the unregulated supply. lg= The ZSM561 quiescent current (ie 200 pA) I. = Load current taken by the microprocessor system. hee = The minimum hee that can be expected from the pass transistor under worst case conditions. (ie Lowest temperature and minimum input voltage). For the ZTX690B a value of 250 could be used. 4-368CONNECTION DIAGRAMS ZSM561 $08 Package Suffix N8& Out = Vec = NC co Gng = Fo NC oa NC faa NYC Eo NYC Top View $O0T223 Package Suffix - G Voc ry Gnafz] | Gre Out[s) Top View ~ Pin 4 floating or connected to pin 2 Gnd Veco Out Bottom View TO92 Package Suffix - C ORDERING INFORMATION Part Number Package Part Mark ZSM561N8 $08 ZSM561 ZSM561G SOT223 ZSM561 ZSM561C TO92 ZSM561 4-369