描述 Description

The 501B Loco? is the most cost effective way to generate a high-quality clock output from a lower frequency crystal or clock input. The name LOCO stands for Low Cost Oscillator, as it is designed to replace crystal oscillators in most electronic systems. Using Phase-Locked Loop (PLL) techniques, the device uses a standard fundamental mode, inexpensive crystal to produce output clocks up to 15 MHz. Stored in the chip's ROM is the ability to generate nine different multiplication factors, allowing one chip to output many common frequencies (see table on page 2). The device also has an output enable pin which tri-states the clock output when the OE pin is taken low. This product is intended for clock generation. It has low output jitter (variation in the output period), but input to output skew and jitter are not defined or guaranteed. For applications which require defined input to output skew, use the 570B.

特性 Features

·Packaged as 8 pin SOIC or die
·Pb (lead) free package
·IDT's lowest cost PLL clock
·Zero ppm multiplication error
·Output clock frequencies up to 15 MHz
·Extremely low jitter of 25 ps (one sigma)
·Compatible with popular CPUs
·Duty cycle of 45/55 up to 20 MHz
·Nine selectable frequencies
·Operating voltage of 3.3 V or 5.5 V
·Tri-state output for board level testing
·25 mA drive capability at TTL levels
·Ideal for oscillator replacement
·Industrial temperature version available
·Advanced, low-power CMOS process