MM74C927

MM74C925 MM74C926 MM74C927 MM74C928 4-Digit Counters with Multiplexed 7-Segment Output Drivers March 1988 MM74C925 MM74C926 MM74C927 MM74C928 4-Digit Counters with Multiplexed 7-Segment Output Drivers General Description These CMOS counters consist of a 4-digit counter an internal output latch NPN output sourcing drivers for a 7-segment display and an internal multiplexing circuitry with four multiplexing outputs The multiplexing circuit has its own free-running oscillator and requires no external clock The counters advance on negative edge of clock A high signal on the Reset input will reset the counter to zero and reset the carry-out low A low signal on the Latch Enable input will latch the number in the counters into the internal output latches A high signal on Display Select input will select the number in the counter to be displayed a low level signal on the Display Select will select the number in the output latch to be displayed The MM74C925 is a 4-decade counter and has Latch Enable Clock and Reset inputs The MM74C926 is like the MM74C925 except that it has a display select and a carry-out used for cascading counters The carry-out signal goes high at 6000 goes back low at 0000 The MM74C927 is like the MM74C926 except the second most significant digit divides by 6 rather than 10 Thus if the clock input frequency is 10 Hz the display would read tenths of seconds and minutes (i e 9 59 9) The MM74C928 is like the MM74C926 except the most significant digit divides by 2 r...