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DM74S157 Scheda tecnica(PDF) 3 Page - Fairchild Semiconductor |
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DM74S157 Scheda tecnica(HTML) 3 Page - Fairchild Semiconductor |
3 / 5 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. DM74157 Recommended Operating Conditions DM74S157 Electrical Characteristics over recommended operating free air temperature (unless otherwise noted) 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 4.5V applied to all inputs and all outputs OPEN. DM74S157 Switching Characteristics at VCC = 5V and TA = 25°C Supply Voltage 7V Input Voltage 5.5V 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 −1mA IOL LOW Level Output Current 20 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 −1.2 V VOH HIGH Level VCC = Min, IOH = Max 2.7 3.4 V Output Voltage VIL = Max, VIH = Min VOL LOW Level VCC = Min, IOL = Max 0.5 V Output Voltage VIH = Min, VIL = Max II Input Current @ Max Input Voltage VCC = Max, VI = 5.5V 1 mA IIH HIGH Level VCC = Max S or G 100 µA Input Current VI = 2.7V A or B 50 IIL HIGH Level VCC = Max S or G −4 mA Input Current VI = 0.5V A or B −2 IOS Short Circuit Output Current VCC = Max (Note 3) −40 −100 mA ICC Supply Current VCC = Max (Note 4) 50 78 mA RL = 280Ω Symbol Parameter From (Input) CL = 15 pF CL = 50 pF Units To (Output) Min Max Min Max tPLH Propagation Delay Time Data to Y 7.5 10 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Data to Y 6.5 10 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time Strobe to Y 12.5 15 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Strobe to Y 12 15 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time Select to Y 15 17 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Select to Y 15 17 ns HIGH-to-LOW Level Output |
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