Key facts
- Brand
- Fairchild
- Model
- MM74C925
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-08-07
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FAIRCHILD MM74C925 MM74C926 MM74C927 MM74C928 4-Digit Counters with Multiplexed 7-Segment Output Drivers handbook
The document details four models of CMOS counters: the MM74C925 (basic 4-decade counter), the MM74C926 (adds display select and carry-out), the MM74C927 (second digit divides by 6 for seconds/minutes), and the MM74C928 (most significant digit divides by 2, acting as a 314-digit counter). All models feature internal multiplexing circuitry with a free-running oscillator requiring no external clock.
Key features include a wide supply voltage range of 3V to 6V, high noise immunity, and the ability to source up to 40 mA per segment. The devices operate over an industrial temperature range of -40°C to +85°C and are available in Ceramic Dual-In-Line (J) and Molded Dual-In-Line (N) packages.
Fairchild MM74C925 specifications
| Operating Voltage Range | 3V to 6V |
|---|---|
| Maximum Clock Frequency | 2 MHz (Typ) |
| Segment Sourcing Current | 40 mA |
| Multiplexing Output Frequency | 1000 Hz |
All Fairchild MM74C925 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
Does the MM74C928 count to a higher value than standard counters?
Yes, it is a 314-digit counter because its most significant digit divides by 2 rather than 10.
Is an external clock required for the multiplexing circuit?
No, the internal multiplexing circuit has its own free-running oscillator and requires no external clock.
Do these counters require an external clock?
No, the internal multiplexing circuit has its own free-running oscillator and requires no external clock.
What is the function of the Reset input?
A HIGH signal on the Reset input will reset the counter to zero and reset the carry-out LOW.