M74HC697B1R中文資料意法半導(dǎo)體數(shù)據(jù)手冊(cè)PDF規(guī)格書

The HC696/697 are high speed CMOS up/down counters fabricated with silicon gate C2MOS technology.

They achieve the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. The HC696/698 are BCD DECADE COUNTER, and the HC697/699 are 4-BIT BINARY COUNTER. Both devices have register.

They count on the positive edge of the counter clock input (CCK) when selected by the ”Counter Mode”. If the input U/D is held ”H”, the internal counter counts up, and held ”L”, counts down.

The internal counter’s outputs are stored in the output register at the positive edge of register clock (RCK). The counter features enable P and enable T and a ripple-carry output for easy expansion. the register/counter select input, R/C, selects the counter when low or the register when high for the three state outputs, QA, QB, Qc and QD.