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DM74LS249N Scheda tecnica(PDF) 2 Page - National Semiconductor (TI) |
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DM74LS249N Scheda tecnica(HTML) 2 Page - National Semiconductor (TI) |
2 / 6 page Absolute Maximum Ratings (Note) Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range 0 Cto a70 C Storage Temperature Range b 65 Cto a150 C Note The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaran- teed The device should not be operated at these limits The parametric values defined in the ‘‘Electrical Characteristics’’ table are not guaranteed at the absolute maximum ratings The ‘‘Recommended Operating Conditions’’ table will define the conditions for actual device operation Recommended Operating Conditions Symbol Parameter Min Nom Max Units VCC Supply Voltage 475 5 525 V VIH High Level Input Voltage 2 V VIL Low Level Input Voltage 08 V IOH High Level Output Current (BI RBO) b 025 mA IOL Low Level Output Current 8 mA TA Free Air Operating Temperature 0 70 C 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 Voltage VCC e Min IOH e Max 27 34 V (BI RBO)VIL e Max ICEX High Level Output Current VCC e Min VO e 55V 250 m A (a thru g) VOL Low Level Output Voltage VCC e Min IOL e Max 035 05 VIH e Min V IOL e 4 mA VCC e Min 025 04 II Input Current Max VCC e Max VI e 7V 01 mA Input Voltage IIH High Level Input Current VCC e Max VI e 27V 20 m A IIL Low Level Input Current VCC e Max VI e 04V Inputs b 04 mA BI RBO b 12 IOS Short Circuit Output Current VCC e Max (Note 2) b 03 b 20 mA ICC Supply Current VCC e Max VIN e 45V 15 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 2 |
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