This synchronous presettable decade counter features an internal carry look-ahead for cascading in high-speed counting applications. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the count-enable inputs and internal gating. This mode of operation h.
an internal carry look-ahead for cascading in high-speed counting applications. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the count-enable inputs and internal gating. This mode of operation helps eliminate the output counting spikes that are normally associated with asynchronous (ripple-clock) counters. A buffered clock input triggers the four master-slave flip-flops on the rising (positive going) edge of the clock waveform. This counter is fully programmable; that is, the output.
This synchronous presettable decade counter features an internal carry look-ahead for cascading in highspeed counting ap.
No. | Partie # | Fabricant | Description | Fiche Technique |
---|---|---|---|---|
1 | HD74HC669 |
Hitachi Semiconductor |
Synchronous UP/Down Decade/4-bit binary Counter | |
2 | HD74HC669 |
Renesas |
Synchronous Up/Down 4-bit binary Counter | |
3 | HD74HC620 |
Hitachi Semiconductor |
Octal Bus Transceivers | |
4 | HD74HC620 |
Renesas |
Octal Bus Transceivers | |
5 | HD74HC623 |
Hitachi Semiconductor |
Octal Bus Transceivers | |
6 | HD74HC623 |
Renesas |
Octal Bus Transceivers | |
7 | HD74HC640 |
Hitachi Semiconductor |
Octal Bus Transceivers | |
8 | HD74HC640 |
Renesas |
Octal Bus Transceivers | |
9 | HD74HC643 |
Hitachi Semiconductor |
Octal Bus Transceivers | |
10 | HD74HC643 |
Renesas |
Octal Bus Transceivers | |
11 | HD74HC646 |
Hitachi Semiconductor |
Octal Bus Transceivers/Registers | |
12 | HD74HC648 |
Hitachi Semiconductor |
Octal Bus Transceivers/Registers |