ZSM380CSTOB

SUPPLY VOLTAGE MONITOR ZSM380 ISSUE 2 – JANUARY 2003 DEVICE DESCRIPTION FEATURES The ZSM380 is a three terminal under v o l t a g e m o n i t or c ir c ui t fo r u s e i n microprocessor systems. The threshold voltage of the device has been set to 3.8 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 ZSM380 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. 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 3.8 volt threshold for 5 volt logic 20mV hysteresis prevents erratic operation APPLICATIONS • • • • • • The device is available in a TO92 package for through hole applications as well as SOT223 for surface mount requirements. SCHEMATIC DIAGRAM 4-349 Microprocessor systems Computers Computer peripherals Instrumentation Automotive Battery powered equipment ZSM380 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 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 High state output (Vcc increasing) UNITS V IH 3.7 3.81 3.9 V Threshold Voltage Low state output (Vcc decreasing) V IL 3.7 3.79 3.9 V Hysteresis VH 0.01 0.02 0.05 V (Vcc=3.3V, Isink=8.0mA) 0.46 1.0 V (Vcc=3.3V, Isink=2.0mA) 0.15 0.4 V 0.25 V 27 60 mA 0.02 0.5 µA 1.2 1.5 V OUPUT Output sink saturation: V OL (Vcc=1.0V, Isink=0.1mA) Onstate output sink current (Vcc , Output=3.3V) Isink Offstate output leakage current (Vcc , Output=5V) Ioh Clamp diode forward voltage (If=10mA) Vf Propagation delay (Vin 5V to 3.3V, Rl=10k, Tamb=25°C) Td 10 0.6 µs 3 TOTAL DEVICE Operating input voltage range V cc Quiescent input current (Vcc=5V) Iq 1.0 to 6.5 V 140 200 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. 4-350 ZSM380 TYPICAL CHARACTERISTICS 500 10 400 8 Rl =10K Ta =25°C Output Voltage (V) Input Current (µA) 85°C 25°C -40°C 300 200 6 4 2 100 0 0 0 2 4 6 8 10 0 2 Input Voltage (V) Input Current vs. Input Voltage 4 Input Voltage (V) 6 8 10 Output Voltage vs. Input Voltage 50 Rl =10K Vin=3.3V 5 30 3.3 25°C  85°C 4 -40°C 20 10  2 Vout (V) Sink Current (mA) Vin (V) 40 0 0 0 0.4 0.8 1.2 1.6 0 2.0 2 4 6 Time (µs) Output Saturation Voltage (V) Output I(sink) vs. Output V(sat) Reset Delay Time 3.82 50 Vin=0V Upper Threshold 3.81 30 Threshold Voltage (V) Forward Current (mA) 40 85°C 25°C -40°C 20 10 0.4 0.8 1.2 1.6 3.79 Lower Threshold 3.78 3.77 -40 0 0 3.80 2.0 -20 0 20 40 60 80 100 Forward Voltage (V) Temperature ( °C) Clamp Diode I(forward) vs. Voltage Threshold Voltage vs. Temperature 4-351 ZSM380 TIMING DIAGRAM Vcc Threshold Voltage 1V Output Output Undefined Output Undefined APPLICATION CIRCUIT Note 4: A time delayed reset can be accomplished with the additional Cd. æ T DY = RCd ln ç ç 1 ç è − 1 ö V TH (mpu ) ÷÷ V in ÷ ø TDY =Time (Seconds) VTH =Microprocessor Reset Threshold Vin =Power Supply Voltage 4-352 ZSM380 CONNECTION DIAGRAMS SOT223 Package Suffix – G TO92 Top View – Pin 4 floating or connected to pin 2 Package Suffix – C Bottom View ORDERING INFORMATION Part Number Package Part Mark ZSM380G SOT223 ZSM380 ZSM380C TO92 ZSM380 4-353 PRODUCT AND INFORMATION DISCLAIMER This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purposes or form part of any order or contract or be regarded as representation relating to the products or services concerned. The company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service. Some changes to earlier published data may have been made, data presented in this hand book supersedes all previous specifications. The information contained in this publication has been carefully checked and is considered to be accurate, but no responsibility is assumed for any inaccuracies. Zetex makes no warranty, representation or guarantee regarding the suitability of the products and circuits in this publication for any given purpose; nor does Zetex assume any liability arising from the use or application of any of these products or circuits and specifically disclaims any and all consequential and incidental damages. Zetex products are specifically not authorised for use as critical components in life support devices or systems without the express written approval of the Managing Director of Zetex plc. As used herein a. Life support devices or systems are devices or systems which (1) are intended to implant into the body, or (2) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labelling can be reasonably expected to result in significant injury to the user. b. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. E. & O. 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