1.1 GHz Dual Modulus Prescaler With Stand-By Mode

The MC12036 is a 1.1GHz ÷64/65, ÷128/129 dual modulus prescaler used in phase–locked loop (PLL) applications. Stand–By mode is featured to reduce current drain to 0.5mA typical when the standby pin (SB) is switched LOW, disabling the prescaler. On–chip output termination provides sufficient output current to drive a 12pF (typical) high impedance load.

The MC12036A can be used with CMOS synthesizers requiring positive edges to trigger internal counters such as Motorola’s MC145xxx series in a PLL to provide tuning signals up to 1.1GHz in programmable frequency steps. The MC12036B can be used with CMOS synthesizers requiring negative edges to trigger internal counters.

A Divide Ratio Control (SW) permits selection of a 64/65 or 128/129 divide ratio as desired.

The Modulus Control (MC) selects the proper divide number after SW has been biased to select the desired divide ratio.

• 1.1GHz Toggle Frequency

• Low Power 4.0mA Typical

• Stand–By Mode

• On–Chip Output Termination

• Supply Voltage 4.5V to 5.5V

• Operating Temperature Range of –40°C to +85°C

• Short Setup Time (tset ) 16ns Maximum @ 1.1GHz

• Modulus Control Input Level is Compatible With Standard CMOS and TTL