HD74LS193

The HD74LS193 is a kind of synchronous up/down 4-bit binary counter (dual clock lines). The HD74LS193 counter can be easily cascaded by feeding the borrow and carry outputs to the count-down and count-up inputs respectively of the succeeding counter.

What comes next is about the recommended operating conditions of HD74LS193. The minimum clock frequency is 0 and the maximum is 25 MHz. The minimum pulse width is 20 ns. The minimum setup time (Clear) is 40 ns. The minimum setup time is 20 ns. The minimum hold time is 3 ns.

The following is about the electrical characteristics (Ta=-20 to +75) of HD74LS193. The minimum VIH (input voltage) is 2.0 V. The minimum VIL (input voltage) is 0.8 V. The minimum VOH (output voltage) is 2.7 V at VCC=4.75 V, VIH=2 V, VIL=0.8 V, IOH=-400A. The maximum VOL (output voltage) is 0.4 V at VCC=4.75 V, VIH=2 V, VIL=0.8 V, IOL=4 mA and 0.5 V at VCC=4.75 V, VIH=2 V, VIL=0.8 V, IOL=8 mA. The maximum IIH (input current) is 20A at VCC=5.25 V, VI=2.7 V,  the maximum IIL (input current) is -0.4 mA at VCC=5.25 V, VI=0.4 V and the maximum II (input current) is 0.1 mA at VCC=5.25 V, VI=7 V. The minimum IOS (short-circuit output current) is -20 mA and the maximum is -100 mA at VCC=5.25 V. The typical ICC (supply current) is 19 mA and the maximum is 34 mA at VCC=5.25 V. The maximum VIK (input clamp voltage) is -1.5 V at VCC=4.75 V, IIN=-18 mA.