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1 pcs
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1 pcs | On Request | 1 | On Request | On Request | On Request | On Request | On Request |
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The SN74ALS191AN from Texas Instruments is a synchronous 4-bit reversible binary counter. It is designed for up/down counting operations, with synchronous counting achieved by clocking all flip-flops simultaneously. This eliminates output counting spikes common in asynchronous counters.
The counter operates on a low-to-high transition of the clock input when the count enable is low. The direction of the count is controlled by the down/up input. It is fully programmable, allowing each output to be preset to a desired level via the load input and data inputs, independent of the clock.
Key specifications include a maximum count rate of 30 MHz and an operating voltage range of 4.5V to 5.5V. The device is available in a 16-SOIC package and operates within a temperature range of 0°C to 70°C. Its synchronous operation and presettable feature make it suitable for various digital logic applications requiring precise counting and control.
This counter is designed with buffered control inputs (CTEN and D/U) to reduce the loading on clock drivers, which is beneficial for long parallel words. The 'ALS191A series offers package options including plastic small-outline (D) packages, ceramic chip carriers (FK), and standard plastic (N) and ceramic (J) 300-mil DIPs.
| Qty | Low | High |
|---|---|---|
| 1+ | $0.50 | $0.50 |
Estimated market price range - modelled values for guidance only, not live distributor offers.
The operating voltage range is 4.5V to 5.5V.
The device is supplied in a 16-SOIC surface mount package.
The operating temperature range is 0°C to 70°C.
The maximum count rate is 30 MHz.
The device uses synchronous timing with positive edge triggering.
It is a 4-bit counter (one element with 4 bits per element).
It can count both up and down.