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54LS257ALMQB Datasheet(PDF) 2 Page - National Semiconductor (TI) |
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54LS257ALMQB Datasheet(HTML) 2 Page - National Semiconductor (TI) |
2 / 8 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 DM54LS and 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 DM54LS257B DM74LS257B 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 1 b 26 mA IOL Low Level Output Current 12 24 mA TA Free Air Operating Temperature b 55 125 0 70 C ’LS257B 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 24 34 V Voltage VIL e Max VIH e Min DM74 24 31 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 12 mA VCC e Min DM74 025 04 II Input Current Max VCC e Max Select 02 mA Input Voltage VI e 7V Other 01 IIH High Level Input VCC e Max Select 40 m A Current VI e 27V Other 20 IIL Low Level Input VCC e Max Select b 08 mA Current VI e 04V Other b 04 IOZH Off-State Output Current VCC e Max VO e 27V with High Level Output VIH e Min VIL e Max 20 m A Voltage Applied IOZL Off-State Output Current VCC e Max VO e 04V with Low Level Output VIH e Min VIL e Max b 20 m A Voltage Applied IOS Short Circuit VCC e Max DM54 b 20 b 100 mA Output Current (Note 2) DM74 b 20 b 100 ICCH Supply Current with VCC e Max (Note 3) 59 10 mA Outputs High ICCL Supply Current with VCC e Max (Note 3) 92 16 mA Outputs Low ICCZ Supply Current with VCC e Max (Note 3) 12 19 mA Outputs Disabled 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 all outputs open and all possible inputs grounded while achieving the stated output conditions 2 |
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