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MC100E136: ECL 6-Bit Up/Down Universal Counter

The MC10E/100E136 is a 6-bit synchronous, presettable, cascadable universal counter. The device generates a look-ahead-carry output and accepts a look-ahead-carry input. These two features allow for the cacading of multiple E136's for wider bit width counters that operate at very nearly the same frequency as the stand alone counter. The CLOUTbar output will pulse LOW for one clock cycle one count before the E136 reaches terminal count. The COUTbar output will pulse LOW for one clock cycle when the counter reaches terminal count. For more information on utilizing the look-ahead-carry features of the device please refer to the applications section of this data sheet. The differential COUT output facilitates the E136's use in programmable divider and self-stopping counter applications. Unlike the H136 and other similar universal counter designs the E136 carry out and look-ahead-carry out signals are registered on chip. This design alleviates the glitch problem seen on many counters where the carry out architecture there are some minor functional differences between the E136 and H136 counters. The user familiarity with the H136, should read this data sheet carefully. Note specifically (see logic diagram) the operation of the carry out outputs and the look-ahead-carry in input when utilizing the master reset. When left open all of the input pins will be pulled LOW via an input pulldown resistor signal which when asserted will force the Q outputs LOW. The Q outputs need not be terminated for the E136 to function properly, in fact if recommended to save power and minimize noise that they be left open. This practice will minimize switching noise which can reduce the maximum count frequency of the device or significantly reduce margins against other noise in the system.The 100 Series contains temperature compensation.

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