GENERAL DESCRIPTION

The 74HC/HCT297 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. The 74HC/HCT297 are designed to provide a simple, cost-effective solution to high-accuracy, digital,

phase-locked-loop applications. These devices contain all the necessary circuits, with the exception of the divide-by-n counter, to build first order phase-locked-loops.

FEATURES

• Digital design avoids analog compensation errors

• Easily cascadable for higher order loops

• Useful frequency range:

– DC to 55 MHz typical (K-clock)

– DC to 35 MHz typical (I/D-clock)

• Dynamically variable bandwidth

• Very narrow bandwidth attainable

• Power-on reset

• Output capability: standard/bus driver

• ICC category: MSI