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The NTE74177 is a high-speed monolithic counter in a 14-lead plastic DIP-type package consisting of four DC coupled master-slave flip-flops which are internally interconnected to provide a divide-by-two and a divide-by-eight counter. This device is fully programmable; that is, the outputs may be preset to any state by placing a low on the count/load input and entering the desired data at the data inputs. The outputs will change to agree with the data inputs independent of the state of the clocks. The NTE74177 may also be used as a 4-bit latch using the count/load input as the strobe and entering data at the data inputs. The outputs will directly follow the data inputs when the count/load is low, but will remain unchanged when the count/load is high and the clock inputs are active. This high-speed counter will accept count frequencies of 0 to 35MHz at the clock-1 input and 0 to 17.5MHz at the clock-2 input. During the count operation, transfer of information to the outputs occurs on the negative-going edge of the clock pulse. The counter features a direct clear which, when taken low, sets all outputs low regardless of the state of the clocks. All inputs are diode-clamped to minimize transmission-line effects and simplify system design. The circuit is compatible with most TTL logic families and typical power dissipation is 150mW.
Reduced power version of the NTE74197 50MHz counter
Performs BCD, bi-quinary or binary counting
Fully independent clear input
Guaranteed to count at input frequencies from 0 to 35MHz
Input clamping diodes simplify system design
Absolute Maximum Ratings: (Note 1)
Supply voltage VCC: 7V
Input voltage VIN: 5.5V
Interemitter voltage (Note 2): 5.5V
Operating temperature range TA: 0°C to +70°C
Storage temperature range Tstg: −65°C to +150°C
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