ZSM530CSTZ

SUPPLY VOLTAGE MONITOR ZSM530 ISSUE 2 – JANUARY 2003 DEVICE DESCRIPTION FEATURES The ZSM530 is a three terminal under voltage monitor circuit for use in microprocessor systems. The threshold voltage of the device has been set to 4.3 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 ZSM530 features an open collector output capable of sinking at least l0mA which only requires a single external resistor to interface to following circuits. • • 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 4.3 volt threshold for 5 volt logic 20mV hysteresis prevents erratic operation 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. APPLICATIONS The device is available in a TO92 package for through hole applications as well as SOT223 for surface mount requirements. Automotive • • • • • • SCHEMATIC DIAGRAM 4-354 Microprocessor systems Computers Computer peripherals Instrumentation Battery powered equipment ZSM530 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 UNITS Threshold Voltage High state output (Vcc increasing) VIH 4.2 4.31 4.4 V Threshold Voltage Low state output (Vcc decreasing) VIL 4.2 4.29 4.4 V Hysteresis VH 0.01 0.02 0.05 V (Vcc=3.8V, Isink=8.0mA) 0.46 1.0 V (Vcc=3.8V, Isink=2.0mA) 0.15 0.4 V 0.25 V 27 60 mA 0.02 0.5 µA 1.2 1.5 V OUPUT Output sink saturation: VOL (Vcc=1.0V, Isink=0.1mA) Onstate output sink current (Vcc , Output=3.8V) Isink Offstate output leakage current (Vcc , Output=5V) Ioh Clamp diode forward voltage (If=10mA) Vf Propagation delay (Vin 5V to 3.8V, Rl=10k, Tamb=25°C) Td 10 0.6 µs 2 TOTAL DEVICE Operating input voltage range Vcc Quiescent input current (Vcc=5V) Iq 1.0 to 6.5 V 175 260 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. 4-355 ZSM530 500 10 400 8 Output Voltage (V) Input Current (µA) TYPICAL CHARACTERISTICS 300 -40 °C 25 °C 85 °C 200 100 R A=10K T A=25 °C 6 4 2 0 0 0 2 4 6 Input Voltage 8 10 0 10 (V) Output Voltage vs. Input Voltage Vin=4V R L =10K 5 Vin (V) 40 Sink Current (mA) 8 6 Input Voltage Input Current vs. Input Voltage 50 4 2 (V) 4   30 -40 °C 4 25 °C 20 Vout (V) 85 °C 10 2 0 0 0 0.4 0.8 1.2 1.6 0 2.0 1 Output Saturation Voltage vs. Sink Current 100 3 2 4 Time (µs) Output Saturation Voltage (V) Reset Delay Time 4.40 Vin=0V 80 Threshold Voltage (V) Forward Current (mA) 4.35 60 85 °C 25 °C 40 -40 °C 20 0 Upper Threshold 4.30 Lower Threshold 4.25 4.20 0 0.4 0.8 1.2 1.6 2.0 -40 -20 0 20 40 60 80 Temperature (°C) Forward Voltage (V) Clamp Diode Forward Current vs. Voltage Threshold Voltage vs. Temperature 4-356 100 ZSM530 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 4-357 ZSM530 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 ZSM530G SOT223 ZSM530 ZSM530C TO92 ZSM530 4-358