Features: Wide supply voltage range: 3V to 6VGuaranteed noise margin: 1VHigh noise immunity: 0.45 VCC (typ.)High segment sourcing current: 40 mA @ VCC - 1.6V, VCC = 5VInternal multiplexing circuitrySpecificationsVoltage at Any Output Pin GND- 0.3V to VCC + 0.3VVoltage at Any Input Pin GND - 0.3V t...
MM74C926: Features: Wide supply voltage range: 3V to 6VGuaranteed noise margin: 1VHigh noise immunity: 0.45 VCC (typ.)High segment sourcing current: 40 mA @ VCC - 1.6V, VCC = 5VInternal multiplexing circuitry...
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Upload time: 2014-4-20
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Wide supply voltage range: 3V to 6V
Guaranteed noise margin: 1V
High noise immunity: 0.45 VCC (typ.)
High segment sourcing current: 40 mA @ VCC - 1.6V, VCC = 5V
Internal multiplexing circuitry
Voltage at Any Output Pin GND- 0.3V to VCC + 0.3V
Voltage at Any Input Pin GND - 0.3V to +15V
Range (TA) -40°C to +85°C
Range -65°C to +150°C
Power Dissipation (PD)Refer to PD(MAX) vs TA Graph
OperatingVCC Range 3V to 6V
(Soldering, 10 seconds) 260°C
The MM74C925, MM74C926, MM74C927 and MM74C928 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 of MM74C926 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 of MM74C926 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 rather than 10 and the carry-out is an overflow indicator which is HIGH at 2000, and it goes back LOW only when the counter is reset. Thus, this is a 3½-digit counter.
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