General Description

The ICS9161A is a fully programmable graphics clock generator. It can generate user-specified clock frequencies using an externally generated input reference or a single crystal. The output frequency is programmed by entering a 24-bit digital word through the serial port. Two fully user programmable phase-locked loops are offered in a single package. One PLL is designed to drive the memory clock, while the second drives the video clock. The outputs may be changed on-the-fly to any desired frequency between 390 kHz and 120 MHz. The ICS9161A is ideally suited for any design where multiple or varying frequencies are required.

Features

• Pin-for-pin and function compatible with ICD2061A

• Dual programmable graphics clock generator

• Memory and video clocks are individually programmable on-the-fly

• Ideal for designs where multiple or varying frequencies are required

• Increased frequency resolution from optional predivide by 2 on the M counter

• Output enable feature available for tristating outputs

• Independent clock outputs range from 390 kHz to 120 MHz for VDD >4.75V

• Power-down capabilities

• Low power, high speed 0.8µ CMOS technology

• Glitch-free transitions

• Available in 16-pin, 300-mil SOIC or PDIP package