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DM74LS157M Datasheet(PDF) 4 Page - Fairchild Semiconductor |
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DM74LS157M Datasheet(HTML) 4 Page - Fairchild Semiconductor |
4 / 7 page www.fairchildsemi.com 4 DM74LS158 Recommended Operating Conditions DM74LS158 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Note 5: All typicals are at VCC = 5V, TA = 25°C. Note 6: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note 7: ICC is measured with 4.5V applied to all inputs and all outputs OPEN. DM74LS158 Switching Characteristics at VCC = 5V and TA = 25°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 −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 (Note 5) VI Input Clamp Voltage VCC = Min, II = −18 mA −1.5 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 0.35 0.5 Output Voltage VIL = Max, VIH = Min V IOL = 4 mA, VCC = Min 0.25 0.4 II Input Current @ Max VCC = Max S or G 0.2 mA Input Voltage VI = 7V A or B 0.1 IIH HIGH Level VCC = Max S or G 40 µA Input Current VI = 2.7V A or B 20 IIL LOW Level VCC = Max S or G −0.8 mA Input Current VI = 0.4V A or B −0.4 IOS Short Circuit Output Current VCC = Max (Note 6) −20 −100 mA ICC Supply Current VCC = Max (Note 7) 4.8 8 mA From (Input) RL = 2 kΩ Symbol Parameter To (Output) CL = 15 pF CL = 50 pF Units Min Max Min Max tPLH Propagation Delay Time Data to Y 12 18 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Data to Y 12 21 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time Strobe to Y 17 23 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Strobe to Y 18 28 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time Select to Y 20 24 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Select to Y 24 36 ns HIGH-to-LOW Level Output |
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