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ZSM561C Datasheet(PDF) 1 Page - Zetex Semiconductors |
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ZSM561C Datasheet(HTML) 1 Page - Zetex Semiconductors |
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1 / 6 page  SUPPLY VOLTAGE MONITOR ISSUE 3 – JANUARY 1998 ZSM561 DEVICE DESCRIPTION The ZSM561 is a three terminal under v o ltag e mo n i to r c i rc u i t fo r u s e 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 ZSM561 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. Also included is a 6 volt zener diode connected between Vcc and Gnd. With just the addition of a low cost external NPN transistor and resistor, this zener allows the ZSM561 to provide both regulator and supply monitor functions The device is available in a TO92 package for through hole applications as well as SO8 and SOT223 for surface mount requirements. 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 • 4.6 volt threshold for 5 volt logic • 20mV hysteresis prevents erratic operation APPLICATIONS • Microprocessor systems • Computers • Computer peripherals • Instrumentation • Automotive • Battery powered equipment SCHEMATIC DIAGRAM 4-364 |
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