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DM74LS157 Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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DM74LS157 Datasheet(HTML) 3 Page - National Semiconductor (TI) |
3 / 8 page ’LS157 Switching Characteristics at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load) From (Input) RL e 2kX Symbol Parameter To (Output) CL e 15 pF CL e 50 pF Units Min Max Min Max tPLH Propagation Delay Time Data 14 18 ns Low to High Level Output to Y tPHL Propagation Delay Time Data 14 23 ns High to Low Level Output to Y tPLH Propagation Delay Time Strobe 20 24 ns Low to High Level Output to Y tPHL Propagation Delay Time Strobe 21 30 ns High to Low Level Output to Y tPLH Propagation Delay Time Select 23 28 ns Low to High Level Output to Y tPHL Propagation Delay Time Select 27 32 ns High to Low Level Output to Y Recommended Operating Conditions Symbol Parameter DM54LS158 DM74LS158 Units Min Nom Max Min Nom Max VCC Supply Voltage 45 5 55 475 5 525 V VIH High Level Input Voltage 2 2 V VIL Low Level Input Voltage 07 08 V IOH High Level Output Current b 04 b 04 mA IOL Low Level Output Current 4 8 mA TA Free Air Operating Temperature b 55 125 0 70 C ’LS158 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions Min Typ Max Units (Note 1) VI Input Clamp Voltage VCC e Min II eb18 mA b 15 V VOH High Level Output VCC e Min IOH e Max DM54 25 34 V Voltage VIL e Max VIH e Min DM74 27 34 VOL Low Level Output VCC e Min IOL e Max DM54 025 04 Voltage VIL e Max VIH e Min DM74 035 05 V IOL e 4 mA VCC e Min DM74 025 04 II Input Current Max VCC e Max S or G 02 mA Input Voltage VI e 7V AorB 0 1 IIH High Level Input VCC e Max S or G 40 m A Current VI e 27V AorB 20 IIL Low Level Input VCC e Max SorG b 08 mA Current VI e 04V AorB b 04 IOS Short Circuit VCC e Max DM54 b 20 b 100 mA Output Current (Note 2) DM74 b 20 b 100 ICC Supply Current VCC e Max (Note 3) 48 8 mA Note 1 All typicals are at VCC e 5V TA e 25 C Note 2 Not more than one output should be shorted at a time and the duration should not exceed one second Note 3 ICC is measured with 45V applied to all inputs and all outputs open 3 |
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