SUPPLY VOLTAGE MONITOR ZSH330 ISSUE 2- JANUARY 2003 DEVICE DESCRIPTION FEATURES The ZSH330 is a three terminal under voltage monitor circuit for use in microprocessor systems. The threshold voltage of the device has been set to 3.1 volts making it ideal for 3.3 volt circuits. • • • • • • • Included in the device is a precise voltage reference and a comparator with built in hysteresis to prevent erratic operation. The ZSH330 features an open collector output capable of sourcing 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 3.1 volt threshold for 3.3 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 high 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 high. APPLICATIONS The device is available in a TO92 package for through hole applications as well as SOT223 for surface mount requirements. Automotive • • • • • • Microprocessor systems Computers Computer peripherals Instrumentation Battery powered equipment SCHEMATIC DIAGRAM Vcc Out Gnd 4-329 ZSH330 ABSOLUTE MAXIMUM RATING Input Supply Voltage Offstate Output Voltage Onstate Output Source 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 Low state output (Vcc increasing) UNITS VIL 3.01 3.09 3.15 V Threshold Voltage High state output (Vcc decreasing) VIH 3.01 3.07 3.15 V Hysteresis VH 0.01 0.02 0.05 V OUPUT PARAMETER SYMBOL Output source saturation: VOH MIN TYP. MAX. UNITS (Vcc=2.7V, Isource=8.0mA) VCC-1.3 V (Vcc=2.7V, Isource=2.0mA) VCC-1.2 V (Vcc=1.0V, Isource=2µA) VCC-0.4 V 21 50 mA 0.02 0.5 µA 1.2 1.5 Onstate output source current (Vcc=2.7V, Output=0V) Isource Offstate output leakage current (Vcc=3.3V, Output=0V) Ioh Clamp diode forward voltage (If=10mA) Vf Propagation delay (Vin 3.3V to 2.7V, Rl=10k, Tamb=25°C) Td 10 0.6 V µs 1.4 TOTAL DEVICE PARAMETER SYMBOL Operating input voltage range Vcc Quiescent input current (Vcc=3.3V) Iq MIN TYP. MAX. 1.0 to 6.5 UNITS V 130 180 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. 4-330 ZSH330 500 5.0 400 4.0 Output Voltage (V) Input Current (µA) TYPICAL CHARACTERISTICS 300 200 100 85°C 25°C -40°C 0 3.0 2.0 1.0 0.0 0 2 4 6 8 10 0.0 Input Voltage (V) 1.0 2.0 3.0 4.0 5.0 Input Voltage (V) Output Voltage v Input Voltage Input Current v Input Voltage Vin(V) 20 85°C 25°C -40°C 10 0 0.8 0.6 0.4 0.2 0.0 3.3 2.7 2.0 4.0 -40°C 25°C 85°C Vout(V) Source Current (mA) Rl=10k 30 2.0 0.0 0.0 0.4 0.8 1.2 1.6 2.0 0 1 Output Saturation Voltage (V) 100 3.10 80 3.09 85°C 25°C -40°C 40 20 0 0.0 0.4 0.8 1.2 3 4 Reset Delay Time Threshold Voltage (V) Forward Current (mA) Output Saturation Voltage v Source Current 60 2 Time (µs) Upper Threshold 3.08 Lower Threshold 3.07 3.06 3.05 -40 -20 1.6 0 20 40 60 80 100 Temperature (°C) Forward Voltage (V) Threshold Voltage v Temperature Clamp Diode Forward Current v Voltage 4-331 ZSH330 TIMING DIAGRAM APPLICATION CIRCUIT Note 4: A time delayed reset can be accomplished with the additional Cd. TDY =Time (Seconds) 1 é æ 1 ö æ öù T DY = RCd ê ln ç V ÷ − ln ç ÷ú TH =Microprocessor Reset Threshold V V SAT ÷ú ê ç TH ÷ ç (ground referenced) 1− ê ç V ÷ ç ÷ ú V in VSAT =Output Saturation Voltage ( from ë è in ø è øû Output Saturation Voltage characteristic) Vin =Power Supply Voltage 4-332 ZSH330 CONNECTION DIAGRAMS SOT223 Package Suffix – G TO92 Package Suffix – C Top View – Connect pin 4 to pin 2 or leave pin 4 electrically isolated Bottom View ORDERING INFORMATION Part No Package Partmark ZSH330C TO92 ZSH330 ZSH330G SOT223 ZSH330 4-333