SUPPLY VOLTAGE MONITOR ZSH560 ISSUE 1 - MARCH 1998 DEVICE DESCRIPTION FEATURES The ZSH560 is a three terminal under voltage monitor circuit for use in microprocessor systems. The threshold voltage of the device has been set to 4.6 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 ZSH560 features an open collector output capable of sourcing at least l0mA which only requires a single external resistor to interface to following circuits. * * 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 4.6 volt threshold for 5 volt logic 20mV hysteresis prevents erratic operation APPLICATIONS 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. * * * * * * Microprocessor systems Computers Computer peripherals Instrumentation Automotive Battery powered equipment The device is available in a TO92 package for through hole applications as well as SO8 and SOT223 for surface mount requirements. SCHEMATIC DIAGRAM Vcc Out Gnd 4-334 ZSH560 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 Power Dissipation TO92 SOT223 SO8 780mW 2W(Note 2) 780mW(Note 2) 100mA 150C -40 to 85C -55 to 150C TEST CONDITIONS (Tamb=25C for typical values, Tamb=-40 to 85C for min/max values (Note3)) COMPARATOR MIN TYP. MAX. PARAMETER SYMBOL UNITS Threshold Voltage Low state output (Vcc increasing) VIL 4.5 4.61 4.7 V Threshold Voltage High state output (Vcc decreasing) V IH 4.5 4.59 4.7 V Hysteresis VH 0.01 0.02 0.05 V OUPUT PARAMETER SYMBOL Output source saturation: VOH MIN TYP. MAX. UNITS (Vcc=4.0V, Isource=8.0mA) VCC-1.3 V (Vcc=4.0V, Isource=2.0mA) VCC-1.2 V (Vcc=1.0V, Isource=2A) VCC-0.4 V 20 50 mA 0.02 0.5 A 1.2 1.5 V Onstate output source current (Vcc =4.0V, Output=0V) Isource Offstate output leakage current (Vcc =5.0V, Output=0V) Ioh Clamp diode forward voltage (If=10mA) Vf Propagation delay (Vin 5V to 4V, Rl=10k, Tamb=25C) 10 0.6 s 1.5 Td TOTAL DEVICE PARAMETER SYMBOL Operating input voltage range Vcc Quiescent input current (Vcc=5V) Iq MIN TYP. MAX. 1.0 to 6.5 UNITS V 135 200 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. 4-335 ZSH560 TYPICAL CHARACTERISTICS 500 5 400 4 RL = 10k Output Voltage (V) Input Current (A) TA = 25C 300 200 100 25C -40C 85C 0 3 2 1 0 0 2 4 6 8 10 0 1 Input Voltage (V) Input Current v Input Voltage ' 0.3 85C 25C -40C 0.1 0 0 0.4 0.8 1.2 5 1.6 2 4 ' ' ' 0.4 0.2 Vin (V) 0 4 RL = 10k 5 Vout (V) Source Current (mA) 85C 25C -40C 10 3 Output Voltage v Input Voltage 30 20 2 Input Voltage (V) 0 2.0 0 1 2 3 Output Saturation Voltage (V) Time (S) Output Saturation Voltage v Source Current Reset Delay Time 4.70 100 80 Threshold Voltage (V) Forward Current (mA) Vin = 0V 85C 25C -40C 60 40 20 0 0 0.4 0.8 1.2 1.6 Forward Voltage (V) 4.65 Upper Threshold 4.60 Lower Threshold 4.55 4.50 -40 -20 0 20 40 60 80 100 Temperature (C) Clamp Diode Forward Current v Voltage Threshold Voltage v Temperature 4-336 ZSH560 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 (ground referenced) - ln V V TH 1- SAT VSAT =Output Saturation Voltage ( from V V Output Saturation Voltage characteristic) in in Vin =Power Supply Voltage 4-337 ZSH560 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 Package Partmark ZSH560C TO92 ZSH560 ZSH560G SOT223 ZSH560 ZSH560N8 SO8 ZSH560 4-338