ZM33164N8TA

SUPPLY VOLTAGE MONITOR ZM33164 ISSUE 2 – NOVEMBER 1995 DEVICE DESCRIPTION FEATURES The ZM33164 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 4.3volts 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 ZM33164 features an open collector output capable of sinking 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 4.3 volt threshold for 5 volt logic 60mV 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 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. SCHEMATIC DIAGRAM 4-94 Microprocessor systems Computers Computer peripherals Instrumentation Automotive Battery powered equipment ZM33164 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 12V 12V Internally limited Power Dissipation TO92 SOT223 SO8 780mW 2W(Note 2) 780mW(Note 2) 100mA 150°C -40 to 85°C -65 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 4.15 4.33 4.45 V Threshold Voltage Low state output (Vcc decreasing) VIL 4.15 4.27 4.45 V Hysteresis VH 0.02 0.06 V OUTPUT Output sink saturation: VOL (Vcc=4.0V, Isink=8.0mA) 0.46 1.0 V (Vcc=4.0V, Isink=2.0mA) 0.15 0.4 V (Vcc=1.0V, Isink=0.1mA) Onstate output sink current (Vcc , Output=4V) Isink Offstate output leakage current (Vcc , Output=5V) Ioh Clamp diode forward voltage (If=10mA) Vf Propagation delay (Vin 5V to 4V, Rl=10k, Tamb=25°C) Td 10 0.6 0.25 V 20 50 mA 0.02 0.5 µA 1.2 1.5 V µs 2.0 TOTAL DEVICE Operating input voltage range Vcc Quiescent input current (Vcc=5V) Iq 1.0 to 10 V 175 260 µA 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 4-95 ZM33164 TYPICAL CHARACTERISTICS 500 10 8 Output Voltage (V) Input Current (µA) 400 RL=10K TA=25 °C -40 °C 25 °C 85 °C 300 200 6 4 100 2 0 0 2 4 6 8 10 0 2 Input Current vs. Input Voltage 6 10 8 Output Voltage vs. Input Voltage 30 Vin (V) RL =10K Vin=4V -40 °C 20 5 4 25 °C ' 85 °C 4 10 Vout (V) Sink Current (mA) 4 Input Voltage (V) Input Voltage (V) ' 2 0 0 0 0.4 0.8 1.2 1.6 -1 2.0 1 0 3 2 4 Time (µS) Output Saturation Voltage (V) Output Saturation Voltage vs. Sink Current Reset Delay Time 100 Vin=0V 4.34 Upper Threshold 85 °C Threshold Voltage (V) Forward Current (mA) 80 25 °C 60 -40 °C 40 20 4.32 4.30 4.28 Lower Threshold 4.26 4.24 0 0 0.4 0.8 1.2 1.6 2.0 -40 -20 0 20 40 60 80 Temperature ( °C) Forward Voltage (V) Threshold Voltage vs. Temperature Clamp Diode Forward Current vs. Voltage 4-96 ZM33164 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 AAAA AAAAAAAA AAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAAAAAA AAA AAAAAAA AAAA 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 4-97 ZM33164 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 Package Part Mark ZM33164N8 SO8 ZM33164 ZM33164G SOT223 ZM33164 ZM33164C TO92 ZM33164 4-98