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MC100EL39: 5.0 V ECL ÷2, ÷4, ÷8 Clock Generation Chip

The MC100EL39 is a low skew divide by 2/4, divide by 4/6 clock generation chip designed explicitly for low skew clock generation applications. The internal dividers are synchronous to each other, therefore, the common output edges are all precisely aligned.The VBB pin, an internally generated voltage supply, is available to this device only. For single-ended input conditions, the unused differentia input is connected to VBB as a switching reference voltage. VBB may also rebias AC coupled inputs. When used, decouple VBB and VCC via a 0.01 F capacitor and limit current sourcing or sinking to 0.5 mA. When not used, VBB should be left open.The common enable (ENbar) is synchronous so that the internal dividers will only be enabled/disabled when the internal clock is already in the LOW state. This avoids any chance of generating a runt clock pulse on the internal clock when the device is enabled/disabled as can happen with an asynchronous control. An internal runt pulse could lead to losing synchronization between the internal divider stages. The internal enable flip-flop is clocked on the falling edge of the input clock, therefore, all associated specification limits are referenced to the negative edge of the clock input.Upon startup, the internal flip-flops will attain a random state; therefore, for systems which utilize multiple EL39s, the master reset (MR) inputmust be asserted to ensure synchronization. For systems which only use one EL39, the MR pin need not be exercised as the internal divider design ensures synchronization between the divide by 2/4 and the divide by 4/6 outputs of a singledevice.

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