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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 (Reset) 7V Input Voltage (A or B) 55V Operating Free Air Temperature Range 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 DM74LS90 Units Min Nom Max 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 b 04 mA IOL Low Level Output Current 8 mA fCLK Clock Frequency (Note 1) A to QA 032 MHz BtoQB 016 fCLK Clock Frequency (Note 2) A to QA 020 MHz BtoQB 010 tW Pulse Width (Note 1) A 15 B30 ns Reset 15 tW Pulse Width (Note 2) A 25 B50 ns Reset 25 tREL Reset Release Time (Note 1) 25 ns tREL Reset Release Time (Note 2) 35 ns TA Free Air Operating Temperature 0 70 C Note 1 CL e 15 pF RL e 2kX TA e 25 C and VCC e 5V Note 2 CL e 50 pF RL e 2kX TA e 25 C and VCC e 5V ’LS90 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 27 34 V Voltage VIL e Max VIH e Min VOL Low Level Output VCC e Min IOL e Max Voltage VIL e Max VIH e Min 035 05 V (Note 4) IOL e 4 mA VCC e Min 025 04 II Input Current Max VCC e Max VI e 7V Reset 01 Input Voltage VCC e Max A 02 mA VI e 55V B 04 2 |
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