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DM74ALS157N Fiches technique(PDF) 3 Page - Fairchild Semiconductor |
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DM74ALS157N Fiches technique(HTML) 3 Page - Fairchild Semiconductor |
3 / 6 page 3 www.fairchildsemi.com 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 Electrical Characteristics over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25°C. Switching Characteristics over recommended operating free air temperature range. 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 4.5 5 5.5 V VIH HIGH Level Input Voltage 2 V VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −0.4 mA IOL LOW Level Output Current 8 mA TA Free Air Operating Temperature 0 70 °C Symbol Parameter Conditions Min Typ Max Units VIK Input Clamp Voltage VCC = 4.5V, II = −18 mA −1.2 V VOH HIGH Level Output Voltage IOH = −0.4 mA, VCC = 4.5V to 5.5V VCC − 2V VOL LOW Level VCC = 4.5V IOL = 4 mA 0.25 0.4 V Output Voltage IOL = 8 mA 0.35 0.5 V II Input Current @ Maximum VCC = 5.5V, VIH = 7V 0.1 mA Input Voltage IIH HIGH Level Input Current VCC = 5.5V, VIH = 2.7V 20 µA IIL LOW Level Input Current VCC = 5.5V, VIL = 0.4V −0.1 mA IO Output Drive Current VCC = 5.5V VO = 2.25V −30 −112 mA ICC Supply Current VCC = 5.5V DM74ALS157 6 11 mA All Inputs = 4.5V DM74ALS158 5 10 mA Symbol Parameter From (Input) Conditions DM74ALS157 DM74ALS158 Units To (Output) Min Max Min Max tPLH Propagation Delay Time Data to Y VCC = 4.5V to 5.5V 3 14 3 15 ns LOW-to-HIGH Level Output CL = 50 pF tPHL Propagation Delay Time RL = 500Ω 2 121 8ns HIGH-to-LOW Level Output tPLH Propagation Delay Time Strobe to Y 6 20 5 18 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time 4 13 5 18 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time Select to Y 7 24 5 19 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time 4 14 5 18 ns HIGH-to-LOW Level Output |
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