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    | Partname: | IN74ALS161AD |  | Description: | Synchronous 4 bit counters; binary, direct reset |  | Manufacturer: |  |  | Package: | SOIC |  | Pins: | 16 |  | Oper. temp.: | -10 to 70 |  | Datasheet: | PDF (230K). Click here to download *)
 |  | The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without additional gating. Instrumental in accomplishiing this function are two counter-enable inputs and a ripple carry output. Both countenable inputs (ENABLE P and ENABLE T) must be high to count, and ENABLE T is fed forward to enable the ripple carry output. The ripple carry output thus enabled will produce a high-level output pulse with a duration approximately equal to the high level portion of the QA output. The high-level overflow ripple carry pulse can be enable successive cascaded stages. Transitions at the ENPor ENT are allowed regardless of the level of the clock input. Internal Look-Ahead for Fast Counting Carry Output for n-Bit Cascading Synchronous Counting |  |  Click here to download IN74ALS161AD Datasheet*)
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