74HCT297中文資料飛利浦數(shù)據(jù)手冊PDF規(guī)格書

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