Motorola MC10E211 MC100E211 Data Manual

SEMICONDUCTOR TECHNICAL DATA

The MC10E/100E211 is a low skew 1:6 fanout device designed explicitly for low skew clock distribution applications. The device can be driven by either a differential or single-ended ECL or, if positive power supplies are used, PECL input signal (PECL is an acronym for Positive ECL, PECL levels are ECL levels referenced to +5V rather than ground). If a single-ended input is to be used the VBB pin should be connected to 1:6 DIFFERENTIAL the CLK input and bypassed to ground via a 0.01µF capacitor. The VBB

CLOCK DISTRIBUTION CHIP

supply is designed to act as the switching reference for the input of the E211 under single-ended input conditions, as a result this pin can only source/sink up to 0.5m A of current.

Guaranteed Low Skew Specification Synchronous Enabling/Disabling Multiplexed Clock Inputs VBB Output for Single-Ended Use Internal 75kΩ Input Pulldown Resistors Common and Individual Enable/Disable Control

FN SUFFIX

High Bandwidth Output Transistors

PLASTIC PACKAGE

Extended 100E VEE Range of –4.2V to –5.46V

CASE 776-02

The E211 features a multiplexed clock input to allow for the distribution of a lower speed scan or test clock along with the high speed system clock. When LOW (or left open in which case it will be pulled LOW by the input pulldown resistor) the SEL pin will select the differential clock input.

Both a common enable and individual output enables are provided. When asserted the positive output will go LOW on the next negative transition of the CLK (or SCLK) input. The enabling function is synchronous so that the outputs will only be enabled/disabled when the outputs are already in the LOW state. In this way the problem of runt pulse generation during the disable operation is avoided. Note that the internal flip flop is clocked on the falling edge of the input clock edge, therefore all associated specifications are referenced to the negative edge of the CLK input.

The output transitions of the E211 are faster than the standard ECLin PS edge rates. This feature provides a means of distributing higher frequency signals than capable with the E111 device. Because of these edge rates and the tight skew limits guaranteed in the specification, there are certain termination guidelines which must be followed. For more details on the recommended termination schemes please refer to the applications information section of this data sheet.

FUNCTION TABLE CLK SCLK SEL ENx H/L CLK

H/L SCLK

Z* Z* * Z = Negative transition of CLK or SCLK

ECLin PS is a trademark of Motorola Inc.

2–1 REV 3 Motorola, Inc. 1996