74LS – Decade and Binary Counters

Part Number : 74LS

Function : Decade and Binary Counters

Manufactures : National Semiconductor

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Description :

DM74LS90 DM74LS93 Decade and Binary Counters June 1989 DM74LS90 DM74LS93 Decade and Binary Counters General Description Each of these monolithic counters contains four masterslave flip-flops and additional gating to provide a divide-bytwo counter and a three-stage binary counter for which the count cycle length is divide-by-five for the ’LS90 and divideby-eight for the ’LS93 All of these counters have a gated zero reset and the LS90 also has gated set-to-nine inputs for use in BCD nine’s complement applications To use their maximum count length (decade or four bit binary) the B input is connected to the QA output The input count pulses are applied to input A and the outputs are as described in the appropriate truth table A symmetrical divide-by-ten count can be obtained from the ’LS90 counters by connecting the QD output to the A input and applying the input count to the B input which gives a divide-by-ten square wave at output QA Features Y Y Typical power dissipation 45 mW Count frequency 42 MHz Connection Diagrams (Dual-In-Line Packages) TL F 6381 – 1 Order Number DM74LS90M or DM74LS90N See NS Package Number M14A or N14A TL F 6381 – 2 Order Number DM74LS93M or DM74LS93N 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 please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage Input Voltage (Reset) Input Voltage (A or B) Operating Free Air Temperature Range DM74LS Storage Temperature Range 7V 7V 5 5V 0 C to a 70 C b 65 C to a 150 C Note The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed 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 VCC VIH VIL IOH IOL fCLK fCLK tW Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low Level Output Current Clock Frequency (Note 1) Clock Frequency (Note 2) Pulse Width (Note 1) A to QA B to QB A to QA B to QB A B Reset tW Pulse Width (Note 2) A B Reset tREL tREL TA Reset Release Time (Note 1) Reset Release Time (Note 2) Free Air Operating Temperature 0 0 0 0 15 30 15 25 50 25 25 35 0 70 ns ns C ns ns Parameter Min 4 75 2 08 b0 4 DM74LS90 Nom 5 Max 5 25 Units V V V mA mA MHz MHz 8 32 16 20 10 Note 1 CL e 15 pF RL e 2 kX TA e 25 C and VCC e 5V Note 2 CL e 50 pF RL e 2 kX TA e 25 C and VCC e 5V ’LS90 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH VOL Parameter Input Clamp Voltage High Level Output Voltage Low Level Outpu […]

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74LS Datasheet


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