Part # 74LS90 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: DM74LS90 DM74LS93 Decade and Binary Counters

Part Details:

DM74LS90DM74LS93 June 1989 DM74LS90 DM74LS93Decade and Binary Counters General DescriptionEach of these monolithic counters contains four master- count pulses are applied to input A and the outputs are as slave flip-flops and additional gating to provide a divide-by- described in the appropriate truth table A symmetrical di- two counter and a three-stage binary counter for which the vide-by-ten count can be obtained from the LS90 counters count cycle length is divide-by-five for the LS90 and divide- by connecting the QD output to the A input and applying the Decade by-eight for the LS93 input count to the B input which gives a divide-by-ten square All of these counters have a gated zero reset and the LS90 wave at output QA also has gated set-to-nine inputs for use in BCD nine s com-plement applications Features To use their maximum count length (decade or four bit bina- Y Typical power dissipation 45 mW Y and ry) the B input is connected to the QA output The input Count frequency 42 MHz Connection Diagrams (Dual-In-Line Packages) Binary Counters TL F 6381 ­ 1 TL F 6381 ­ 2 Order Number DM74LS90M or DM74LS90N Order Number DM74LS93M or DM74LS93N See NS Package Number M14A or N14A See NS Package Number M14A or N14A C1995 National Semiconductor Corporation TL F 6381 RRD-B30M105 Printed in U S A Absolute Maximum Ratings (Note)If Military Aerospace specified devices are required Note The ``Absolute Maximum Ratings are those values please contact the National Semiconductor Sales beyond which the safety of the device cannot be guaran- Office Distributors for availability and specifications teed The device should not be operated at these limits The Supply Voltage 7V parametric values defined in the ``Electrical Characteristics table are not guaranteed at the absolute maximum ratings Input Voltage (Reset) 7V The ``Recommended Operating Conditions table will define Input Voltage (A or B) 5 5V the conditions for actual device operation Operating Free Air Temperature Range DM74LS

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74LS90.pdf Datasheet