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| SUPPLY VOLTAGE MONITOR ISSUE 1 - NOVEMBER 1995 DEVICE DESCRIPTION The ZSM300 is a three terminal under vo l ta ge mo ni t or ci rc ui t f or use i n microprocessor systems. The threshold voltage of the device has been set to 2.63 volts making it ideal for 3 volt circuits. Included in the device is a precise voltage reference and a comparator with built in hysteresis to prevent erratic operation. The ZSM300 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. The device is available in a TO92 package for through hole applications as well as SO8 and SOT223 for surface mount requirements. ZSM300 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 2.63 volt threshold for 3 volt logic 20mV hysteresis prevents erratic operation APPLICATIONS Microprocessor systems Computers Computer peripherals Instrumentation Automotive Battery powered equipment SCHEMATIC DIAGRAM 4-339 ZSM300 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 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 High state output (Vcc increasing) Threshold Voltage Low state output (Vcc decreasing) Hysteresis SYMBOL VIH VIL VH MIN TYP. MAX. UNITS V V V 2.56 2.56 0.01 2.64 2.62 0.02 2.7 2.7 0.05 OUPUT Output sink saturation: (Vcc=2.2V, Isink=8.0mA) (Vcc=2.2V, Isink=2.0mA) (Vcc=1.0V, Isink=0.1mA) Onstate output sink current (Vcc , Output=2.2V) Offstate output leakage current (Vcc , Output=3V) Clamp diode forward voltage (If=10mA) Propagation delay (Vin 3V to 2.2V, Rl=10k, Tamb=25C) Isink Ioh Vf Td 0.6 10 27 0.02 1.2 2.5 VOL 0.46 0.15 1.0 0.4 0.25 60 0.5 1.5 V V V mA A V s TOTAL DEVICE Operating input voltage range Quiescent input current (Vcc=3V) Vcc Iq 1.0 to 6.5 125 190 V 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. 4-340 ZSM300 TYPICAL CHARACTERISTICS 500 5 R =10K TA =25 C 400 4 Input Current (A) 85 C 200 -40 C 25 C 100 Output Voltage 300 (V) 3 2 1 0 0 2 4 6 8 10 0 0 1 2 3 4 5 Input Voltage (V) Input Voltage (V) Input Current vs. Input Voltage 50 Vin=2.4V Output Voltage vs. Input Voltage RL =10K 40 Vin (V) 3.0 2.4 2 4 Sink Current (mA) 30 -40 C 25 C 20 85 C Vout (V) 2 10 0 0 0.4 0.8 1.2 1.6 2.0 0 0 1 2 3 4 Output Saturation Voltage (V) Time (s) Output Saturation Voltage vs. Sink Current 100 Vin=0V 2.65 Reset Delay Time Upper Threshold 80 2.64 Forward Current (mA) Threshold Voltage (V) 60 85 C 40 25 C -40 C 20 2.63 2.62 Lower Threshold 2.61 0 0 0.4 0.8 1.2 1.6 2.0 2.60 -40 -20 0 20 40 60 80 100 Forward Voltage (V) Temperature (C) Clamp Diode Forward Current vs. Voltage Threshold Voltage vs. Temperature 4-341 ZSM300 TIMING DIAGRAM Vcc Threshold Voltage 1V Output AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA Output Undefined Output Undefined APPLICATION CIRCUIT Note 4: A time delayed reset can be accomplished with the additional Cd. 1 T DY = RCd ln V TH (mpu) 1 - V in TDY =Time (Seconds) VTH =Microprocessor Reset Threshold Vin =Power Supply Voltage 4-342 ZSM300 CONNECTION DIAGRAMS SO8 Package Suffix - N8 SOT223 Package Suffix - G Top View Top View - Pin 4 floating or connected to pin 2 TO92 Package Suffix - C Bottom View ORDERING INFORMATION Part Number ZSM300N8 ZSM300G ZSM300C Package SO8 SOT223 TO92 Part Mark ZSM300 ZSM300 ZSM300 4-343 |
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