SUPPLY VOLTAGE MONITOR ISSUE JULY 26 DEVICE DESCRIPTION The ZM3316 is a three terminal under voltage monitor circuit for use in microprocessor systems. The threshold voltage of the device has been set to.3volts making it ideal for 5 volt circuits. Included in the device is a precise voltage reference and a comparator with built in hysteresis to prevent erratic operation. The ZM3316 features an open collector output capable of sinking at least lma which only requires a single external resistor to interface to following circuits. Operation of the device is guaranteed from one volt upwards, from this level to the device threshold voltage the output is held low 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. The device is available in a TO92 package for through hole applications as well as SOT223 for surface mount requirements. ZM3316 FEATURES SOT223 and TO92 packages Power on reset generator Automatic reset generation Low standby current Guaranteed operation from 1 volt Wide supply voltage range Internal clamp diode to discharge delay capacitor.3 volt threshold for 5 volt logic 6mV hysteresis prevents erratic operation APPLICATIONS Microprocessor systems Computers Computer peripherals Instrumentation Automotive Battery powered equipment SCHEMATIC DIAGRAM -9
ABSOLUTE MAXIMUM RATING Input Supply Voltage -1 to 12V Power Dissipation Offstate Voltage 12V TO92 78mW Onstate SOT223 2W(Note 2) Sink Current(Note 1) Internally limited Clamp diode Forward Current(Note 1) 1mA Operating junction temperature 15 C Operating Temperature - to 85 C Storage Temperature -65 to 15 C TEST CONDITIONS (T amb =25 C for typical values, T amb =- to 85 C for min/max values (Note3)) COMPARATOR PARAMETER SYMBOL MIN TYP. MAX. UNITS Threshold Voltage High state output (Vcc increasing) V IH.15.33.5 V Threshold Voltage Low state output (Vcc decreasing) V IL.15.27.5 V Hysteresis V H.2.6 V OUTPUT sink saturation: V OL (V cc =.V, I sink =8.mA).6 1. V (V cc =.V, I sink =2.mA).15. V (V cc =1.V, I sink =.1mA).25 V Onstate output sink current (V cc, =V) Offstate output leakage current (V cc, =5V) Clamp diode forward voltage (I f =1mA) Propagation delay (V in 5V to V, R l =1k, T amb =25 C) TOTAL DEVICE ZM3316 I sink 1 2 5 ma I oh.2.5 µa V f.6 1.2 1.5 V T d 2. µs Operating input voltage range V cc 1. to 1 V Quiescent input current (V cc =5V) I q 175 26 µa Note: 1. Maximum package power dissipation must be observed 2. Maximum power dissipation for the SOT223 package 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 -95
ZM3316 TYPICAL CHARACTERISTICS 5 1 R L=1K T A=25 C 8 Forward Current (ma) Sink Current (ma) Input Current (µa) 3 2 1 3 2 1 2 6 8 1 Input Voltage (V) Input Current vs. Input Voltage Vin=V - C 25 C 85 C..8 1.2 1.6 2. Saturation Voltage vs. Sink Current 1 8 6 2 Saturation Voltage (V) Vin=V - C 25 C 85 C 85 C 25 C - C Threshold Voltage (V) Vout (V) Vin (V) Voltage (V).3.32.3.28.26 6 2 2 6 8 Input Voltage (V) 5 2 Voltage vs. Input Voltage -1 RL =1K 1 2 3 Time (µs) Reset Delay Time Upper Threshold Lower Threshold 1.2..8 1.2 1.6 2. Forward Voltage (V) Clamp Diode Forward Current vs. Voltage - -2 2 6 8 Temperature ( C) Threshold Voltage vs. Temperature -96
ZM3316 TIMING DIAGRAM Vcc Threshold Voltage 1V Undefined Undefined APPLICATION CIRCUIT Note : A time delayed reset can be accomplished with the additional Cd. T DY = RCd ln æ 1 ö V TH (mpu ) T DY =Time (Seconds) 1 V V TH =Microprocessor Reset Threshold è in ø V in =Power Supply Voltage -97
ZM3316 CONNECTION DIAGRAMS TO92 Package Suffix C SOT223 Package Suffix G Bottom View Top View Pin floating or connected to pin 2 ORDERING INFORMATION Part Number Package Part Mark ZM3316G SOT223 ZM3316 ZM3316C TO92 ZM3316 Europe Zetex GmbH Streitfeldstraße 19 D-81673 München Germany Americas Asia Pacific Zetex Inc 7 Veterans Memorial Highway Hauppauge, NY 11788 USA Zetex (Asia Ltd) 371- Metroplaza Tower 1 Hing Fong Road, Kwai Fong Hong Kong Corporate Headquarters Zetex Semiconductors plc Zetex Technology Park, Chadderton Oldham, OL9 9LL United Kingdom Telefon: (9) 89 5 9 9 Fax: (9) 89 5 9 9 9 europe.sales@zetex.com Telephone: (1) 631 36 2222 Fax: (1) 631 36 8222 usa.sales@zetex.com Telephone: (852) 261 611 Fax: (852) 225 9 asia.sales@zetex.com Telephone: () 161 622 Fax: () 161 622 6 hq@zetex.com For international sales offices visit /offices Zetex products are distributed worldwide. For details, see /salesnetwork This publication is issued to provide outline information only which (unless agreed by the company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contact or be regarded as a representation relating to the products or services concerned. The company reserves -98 the right to alter without notice the specification, design, price or conditions of supply of any product or service.