HD74LS293

     This HD74LS293 counter contains four master-slave flip-flops and additional gating to provide a divide-by-two counter and divide-by-eight counter. This HD74LS293 counter has a gated zero reset. To use the maximum count length of this counter , 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 function table.
     There are some absolute maximum ratings about HD74LS293. Supply voltage (Vcc) is 7.0V.Input voltage(Ro inputs)(VIN) is 7.0 V . Input voltage (A,B inputs) (V_IN) is 5.5 V. Operating temperature range(T_opr) is -20 to +75. Storage temperature range (T_stg) is -65 to +150. Otherwise, there are some electrical characteristics about it when Ta is -20 to +75. Input voltage(V_IH) is 2.0 V min and Input voltage(V_IL) is 0.8V max. Output voltage (V_OH) is 2.7V min when Vcc is 4.75V,VIH is 2V, VIL is 0.8V and I_OH is -400A. Output voltage(V_OL) is 0.4V max when Vcc is 4.75V,VIH is 2V, VIL is 0.8V and IOL is 4mA.Output voltage(V_OL) is 0.5V max when Vcc is 4.75V,VIH is 2V, VIL is 0.8V and IOL is 8mA. Input current(any reset)(I_IH) is 20A max when Vcc is 5.25V ans Vi is 0.4V while is 40A when Vcc is 5.25V and Vi is 2.7V( A input and B input). Short-circuit output current(Ios) is 20 mA min and 100 mA max when Vcc is 5.25V. Supply current(Icc) is 9 mA typ and 15 mA max when Vcc is 5.25V. Input clamp voltage(Vtx) is 1.5V max when Vcc is 4.75V and IIN is -18 mA.
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