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TL7700A Fiches technique(PDF) 1 Page - STMicroelectronics |
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TL7700A Fiches technique(HTML) 1 Page - STMicroelectronics |
1 / 7 page TL7700A Series July 2000 SUPPLY VOLTAGE SUPERVISORS ® . POWER-ON RESET GENERATOR . AUTOMATIC RESET GENERATION AFTER VOLTAGE DROP . WIDE SUPPLY VOLTAGE RANGE ... 3V TO 18V . PRECISION VOLTAGE SENSOR . TEMPERATURE-COMPENSATED VOLTAGE REFERENCE . TRUE AND COMPLEMENT RESET OUTPUTS . EXTERNALLY ADJUSTABLE PULSE WIDTH N Minidip DESCRIPTION The TL7700A series are monolithic supply voltage supervisor IC’s specifically designed for use as reset controllers in microcomputer and microprocessor systems. During power-up the device tests the sup- ply voltage and keeps the RESET and RESET out- puts active (high and low, respectively) as long as the supply voltage has not reached its nominal volt- age value. Taking RESIN low has the same effect. To ensure that the microcomputer system has reset, the TL7700A then initiates an internal time count that delays the return of the reset outputs to their in- active states. Since the time delay for most micro- computers and microprocessors is in the order of several machine cycles, the device internal time de- lay is determined by an external capacitor con- nected to the CT input (pin 3). tpo = 1.3 x 10 4 x CT Where : CT is in farads (F) and tpo in seconds (s). In addition, when the supply voltage drops below the nominal value, the outputs will be active until the supply voltage returns to the nominal value. An ex- ternal capacitor (typically 0.1 µF) must be connected to the REF output (pin 1) to reduce the influence of fast transients in the supply voltage. The TL7700AI series is characterized for operation from – 25 oC to 85oC ; the TL7700AC series is char- acterized from 0 oC to 70oC. D SO8 ORDERING NUMBERS Temperature Range Minidip S08 0 to 70 oC TL77XXACP TL77XXACD -25 to 85 oC TL77XXAIP TL77XXAID PIN CONNECTION (top view) 1/7 |
Numéro de pièce similaire - TL7700A |
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Description similaire - TL7700A |
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