SUPPLY VOLTAGE MONITOR ZSM380 ISSUE 3 – JULY 2006 DEVICE DESCRIPTION FEATURES The ZSM380 is a three terminal under v o l t a g e m o n i t or c ir c ui t fo r u s e i n microprocessor systems. The threshold voltage of the device has been set to 3.8 volts 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 ZSM380 features an open collector output capable of sinking at least l0mA 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. • • • • • • SCHEMATIC DIAGRAM 4-349 © Zetex Semiconductors plc 2006 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 3.8 volt threshold for 5 volt logic 20mV hysteresis prevents erratic operation APPLICATIONS The device is available in a TO92 package for through hole applications as well as SOT223 for surface mount requirements. Issue 3 - July 2006 SOT223 and TO92 packages Microprocessor systems Computers Computer peripherals Instrumentation Automotive Battery powered equipment ZSM380 ABSOLUTE MAXIMUM RATING Input Supply Voltage Offstate Output Voltage Onstate Output Sink Current(Note 1) Clamp Diode Forward Current(Note 1) Operating Junction Temperature Operating Temperature Storage Temperature -1 to 10V 10V Power Dissipation TO92 SOT223 780mW 2W(Note 2) Internally limited 100mA 150°C -40 to 85°C -55 to 150°C TEST CONDITIONS (Tamb=25°C for typical values, Tamb=-40 to 85°C for min/max values (Note3)) COMPARATOR MIN TYP. MAX. PARAMETER SYMBOL Threshold Voltage High state output (Vcc increasing) V IH 3.7 Threshold Voltage Low state output (Vcc decreasing) V IL 3.7 3.79 3.9 V Hysteresis VH 0.01 0.02 0.05 V (Vcc=3.3V, Isink=8.0mA) 0.46 1.0 V (Vcc=3.3V, Isink=2.0mA) 0.15 0.4 V 0.25 V 27 60 mA 0.02 0.5 µA 1.2 1.5 V 3.81 3.9 UNITS V OUPUT Output sink saturation: V OL (Vcc=1.0V, Isink=0.1mA) Onstate output sink current (Vcc , Output=3.3V) Isink Offstate output leakage current (Vcc , Output=5V) Ioh Clamp diode forward voltage (If=10mA) Vf Propagation delay (Vin 5V to 3.3V, Rl=10k, Tamb=25°C) Td 10 0.6 µs 3 TOTAL DEVICE Operating input voltage range V cc Quiescent input current (Vcc=5V) Iq 1.0 to 6.5 V 140 200 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. 4-350 Issue 3 - July 2006 © Zetex Semiconductors plc 2006 www.zetex.com ZSM380 TYPICAL CHARACTERISTICS 500 10 400 8 Rl =10K Ta =25°C Output Voltage (V) Input Current (µA) 85°C 25°C -40°C 300 200 6 4 2 100 0 0 0 2 4 6 8 10 0 2 Input Voltage (V) Input Current vs. Input Voltage 4 Input Voltage (V) 6 8 10 Output Voltage vs. Input Voltage 50 Rl =10K Vin=3.3V 5 30 3.3 25°C 85°C 4 -40°C 20 10 2 Vout (V) Sink Current (mA) Vin (V) 40 0 0 0 0.4 0.8 1.2 1.6 0 2.0 2 4 6 Time (µs) Output Saturation Voltage (V) Output I(sink) vs. Output V(sat) Reset Delay Time 3.82 50 Vin=0V Upper Threshold 3.81 30 Threshold Voltage (V) Forward Current (mA) 40 85°C 25°C -40°C 20 10 0.4 0.8 1.2 1.6 3.79 Lower Threshold 3.78 3.77 -40 0 0 3.80 2.0 -20 0 20 40 60 80 100 Forward Voltage (V) Temperature ( °C) Clamp Diode I(forward) vs. Voltage Threshold Voltage vs. Temperature 4-351 Issue 3 - July 2006 © Zetex Semiconductors plc 2006 www.zetex.com ZSM380 TIMING DIAGRAM Vcc Threshold Voltage 1V Output Output Undefined Output Undefined APPLICATION CIRCUIT Note 4: A time delayed reset can be accomplished with the additional Cd. æ T DY = RCd ln ç ç 1 ç è − 1 ö V TH (mpu ) ÷÷ V in ÷ ø TDY =Time (Seconds) VTH =Microprocessor Reset Threshold Vin =Power Supply Voltage 4-352 Issue 3 - July 2006 © Zetex Semiconductors plc 2006 www.zetex.com ZSM380 CONNECTION DIAGRAMS SOT223 Package Suffix – G TO92 Top View – Pin 4 floating or connected to pin 2 Package Suffix – C Bottom View ORDERING INFORMATION Part Number Package Part Mark ZSM380G SOT223 ZSM380 ZSM380C TO92 ZSM380 Europe Americas Asia Pacific Corporate Headquarters Zetex GmbH Streitfeldstraße 19 D-81673 München Germany Zetex Inc 700 Veterans Memorial Highway Hauppauge, NY 11788 USA Zetex (Asia Ltd) 3701-04 Metroplaza Tower 1 Hing Fong Road, Kwai Fong Hong Kong Zetex Semiconductors plc Zetex Technology Park, Chadderton Oldham, OL9 9LL United Kingdom Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 [email protected] Telephone: (1) 631 360 2222 Fax: (1) 631 360 8222 [email protected] Telephone: (852) 26100 611 Fax: (852) 24250 494 [email protected] Telephone: (44) 161 622 4444 Fax: (44) 161 622 4446 [email protected] For international sales offices visit www.zetex.com/offices Zetex products are distributed worldwide. For details, see www.zetex.com/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 4-353 to the products or services concerned. The company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service. Issue 3 - July 2006 © Zetex Semiconductors plc 2006 www.zetex.com