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DM74LS257BM Scheda tecnica(PDF) 2 Page - Fairchild Semiconductor |
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DM74LS257BM Scheda tecnica(HTML) 2 Page - Fairchild Semiconductor |
2 / 5 page www.fairchildsemi.com 2 Absolute Maximum Ratings(Note 1) Note 1: The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. the device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The Recommended Operating Conditions table will define the conditions for actual device operation. Recommended Operating Conditions DC Electrical Characteristics Note 2: All typicals are at VCC = 5V, TA = 25°C. Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note 4: ICC is measured with all outputs open and all possible inputs grounded, while achieving the stated output conditions. Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range 0 °C to +70°C Storage Temperature Range −65°C to +150°C Symbol Parameter Min Nom Max Units VCC Supply Voltage 4.75 5 5.25 V VIH HIGH Level Input Voltage 2 V VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −2.6 mA IOL LOW Level Output Current 24 mA TA Free Air Operating Temperature 0 70 °C Symbol Parameter Conditions Min Typ Max Units (Note 2) VI Input Clamp Voltage VCC = Min, II = −18 mA −1.5 V VOH HIGH Level Output Voltage VIL = Max, VIH = Min 2.4 3.1 V VOL LOW Level Output VIL = Max, VIH = Min 0.35 0.5 V Voltage IOL = 12 mA, VCC = Min 0.25 0.4 II Input Current @ Max VCC = Max, Select 0.2 mA Input Voltage VI = 7V Other 0.1 IIH HIGH Level Input VCC = Max, Select 40 µA Current VI = 2.7V Other 20 IIL LOW Level Input VCC = Max, Select −0.8 mA Current VI = 0.4V Other −0.4 IOZH OFF-State Output Current with VCC = Max, VO = 2.7V 20 µA HIGH Level Output Voltage Applied VIH = Min, VIL = Max IOZL OFF-State Output Current with VCC = Max, VO = 0.4V −20 µA LOW Level Output Voltage Applied VIH = Min, VIL = Max IOS Short Circuit Output Current VCC = Max (Note 3) −20 −100 mA ICCH Supply Current with Outputs HIGH VCC = Max (Note 4) 5.9 10 mA ICCL Supply Current with Outputs LOW VCC = Max (Note 4) 9.2 16 mA ICCZ Supply Current with Outputs Disabled VCC = Max (Note 4) 12 19 mA |
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