650 MHz Prescalers
11C90 11C91 650 MHz Prescalers
Not Intended For New Designs
August 1992
11C90 11C91 650 MHz Prescalers
General Descri...
Description
11C90 11C91 650 MHz Prescalers
Not Intended For New Designs
August 1992
11C90 11C91 650 MHz Prescalers
General Description
The 11C90 and 11C91 are high-speed prescalers designed specifically for communication and instrumentation applications All discussions and examples in this data sheet are applicable to the 11C91 as well as the 11C90
The 11C90 will divide by 10 or 11 and the 11C91 by 5 or 6 both over a frequency range from DC to typically 650 MHz The division ratio is controlled by the Mode Control The divide-by-10 or -11 capability allows the use of pulse swallowing techniques to control high-speed counting modulos by lower-speed circuits The 11C90 may be used with either ECL or TTL power supplies
In addition to the ECL outputs Q and Q the 11C90 contains an ECL-to-TTL converter and a TTL output The TTL output operates from the same VCC and VEE levels as the counter but a separate pin is used for the TTL circuit VEE This minimizes noise coupling when the TTL output switches and
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