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| SUPPLY VOLTAGE MONITOR ISSUE 1 - DECEMBER 1997 DEVICE DESCRIPTION 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. 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. The device is available in a TO92 package for through hole applications as well as SO8 and SOT223 for surface mount requirements. ZSH330 FEATURES * * * * * * * * * * * * * * * SO8, 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 APPLICATIONS Microprocessor systems Computers Computer peripherals Instrumentation Automotive 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 Internally limited 100mA 150C -40 to 85C -55 to 150C Power Dissipation TO92 SOT223 SO8 780mW 2W(Note 2) 780mW(Note 2) TEST CONDITIONS (Tamb=25C for typical values, Tamb=-40 to 85C for min/max values (Note3)) COMPARATOR PARAMETER Threshold Voltage Low state output (Vcc increasing) Threshold Voltage High state output (Vcc decreasing) Hysteresis SYMBOL VIL VIH VH SYMBOL VOH VCC-1.3 VCC-1.2 VCC-0.4 Isource Ioh 0.6 10 21 0.02 1.2 1.4 50 0.5 1.5 V V V mA A V s MIN TYP. MAX. UNITS V V V 3.01 3.01 0.01 3.09 3.07 0.02 3.15 3.15 0.05 OUPUT PARAMETER Output source saturation: (Vcc=2.7V, Isource=8.0mA) (Vcc=2.7V, Isource=2.0mA) (Vcc=1.0V, Isource=2A) Onstate output source current (Vcc=2.7V, Output=0V) Offstate output leakage current (Vcc=3.3V, Output=0V) Propagation delay (Vin 3.3V to 2.7V, Rl=10k, Tamb=25C) MIN TYP. MAX. UNITS Clamp diode forward voltage (If=10mA) Vf Td TOTAL DEVICE PARAMETER Operating input voltage range Quiescent input current (Vcc=3.3V) SYMBOL Vcc Iq MIN TYP. MAX. UNITS V 1.0 to 6.5 130 180 A 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. 4-330 ZSH330 TYPICAL CHARACTERISTICS 500 400 5.0 4.0 Input Current (A) Output Voltage (V) 4 6 8 10 300 200 3.0 2.0 100 0 0 2 85C 25C -40C 1.0 0.0 0.0 1.0 2.0 3.0 4.0 5.0 Input Voltage (V) Input Voltage (V) Input Current v Input Voltage Output Voltage v Input Voltage Rl=10k Vin(V) Vout(V) 2.0 Source Current (mA) 30 20 10 0 0.8 0.6 0.4 0.2 0.0 0.0 0.4 0.8 1.2 1.6 -40C 25C 85C 85C 25C -40C 3.3 2.7 2.0 4.0 2.0 0.0 0 1 2 3 4 Output Saturation Voltage (V) Time (s) Output Saturation Voltage v Source Current 100 3.10 Reset Delay Time Forward Current (mA) Threshold Voltage (V) 80 3.09 3.08 Upper Threshold 60 40 20 0 0.0 85C 25C -40C 3.07 3.06 Lower Threshold 0.4 0.8 1.2 1.6 3.05 -40 -20 0 20 40 60 80 100 Forward Voltage (V) Temperature (C) Clamp Diode Forward Current v Voltage Threshold Voltage v Temperature 4-331 ZSH330 TIMING DIAGRAM APPLICATION CIRCUIT Note 4: A time delayed reset can be accomplished with the additional Cd. TDY =Time (Seconds) VTH =Microprocessor Reset Threshold 1 1 T DY = RCd ln - ln (ground referenced) V SAT VTH 1- VSAT =Output Saturation Voltage ( from V V in Output Saturation Voltage characteristic) in Vin =Power Supply Voltage 4-332 ZSH330 CONNECTION DIAGRAMS SO8 Package Suffix - N8 SOT223 Package Suffix - G Top View Top View - Connect pin 4 to pin 2 or leave pin 4 electrically isolated TO92 Package Suffix - C Bottom View ORDERING INFORMATION Part No ZSH330C ZSH330G ZSH330N8 Package TO92 SOT223 SO8 Partmark ZSH330 ZSH330 ZSH330 4-333 |
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