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DM74LS256N 数据表(PDF) 3 Page - National Semiconductor (TI) |
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DM74LS256N 数据表(HTML) 3 Page - National Semiconductor (TI) |
3 / 6 page Absolute Maximum Ratings (Note) If MilitaryAerospace specified devices are required please contact the National Semiconductor Sales OfficeDistributors for availability and specifications Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range 54LS b 55 Cto a125 C DM74LS 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 54LS256 DM74LS256 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 ts (H) Setup Time HIGH Dn to E 20 20 ns th (H) Hold Time HIGH Dn to E 00 ns ts (L) Setup Time LOW Dn to E 15 15 ns th (L) Hold Time LOW Dn to E 00 ns ts (H) Setup Time HIGH or LOW 00 ns ts (L) An to E tw (L) E Pulse Width LOW 17 17 ns 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 54LS 25 V Voltage VIL e Max DM74 27 34 VOL Low Level Output VCC e Min IOL e Max 54LS 04 Voltage VIH e Min DM74 035 05 V IOL e 4 mA VCC e Min DM74 025 04 II Input Current Max VCC e Max VI e 10V Inputs 01 mA Input Voltage E 02 IIH High Level Input Current VCC e Max VI e 27V Inputs 20 m A E 40 IIL Low Level Input Current VCC e Max VI e 04V Inputs b 04 mA E b 08 IOS Short Circuit VCC e Max 54LS b 20 b 100 mA Output Current (Note 2) DM74 b 20 b 100 ICC Supply Current VCC e Max 25 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 3 |
类似零件编号 - DM74LS256N |
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类似说明 - DM74LS256N |
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