AV9107C Datasheet, PDF (1/9 Pages) Integrated Circuit Systems – CPU Frequency Generator

Integrated
Circuit
Systems, Inc.
AV9107C
CPU Frequency Generator
General Description
The AV9107C offers a tiny footprint solution for generating
two simultaneous clocks. One clock, the REFCLK, is a fixed
output frequency which is the same as the input reference
crystal (or clock). The other clock, CLK1, can vary between 2
and 120 MHz, with up to 16 selectable preprogrammed fre-
quencies stored in internal ROM (frequency range depends on
design option).
The device has advanced features which include on-chip loop
filters, tristate outputs, and power-down capability. A mini-
mum of external components - two decoupling capacitors and
an optional ferrite bead - are all that are required for jitter-free
operation. Standard versions for computer motherboard appli-
cations are theAV9107C-03, andAV9107C-05. Custom masked
versions, with customized frequencies and features, are available
in 6-8 weeks for a small NRE.
Features
• Patented on-chip Phase-Locked Loop with VCO for
clock generation
• Provides reference clock and synthesized clock
• Generates frequencies from 2 to 120 MHz (depending
on option), operates to 80 MHz for V_DD 3.3V±10%
• 8-pin DIP or SOIC package or 14-pin DIP or SOIC
package
• 2 to 32 MHz input reference frequency (depending on
option)
• On-chip loop filter
• Up to 16 frequencies stored internally
• Low power CMOS technology
• Single +3.3 or +5 volt power supply
Applications
Graphics: The AV9107C is the easiest to use, lowest cost,
and smallest footprint frequency generator for graphics
applications. It can generate up to 16 different frequencies,
including all frequencies necessary for VGA standards. It
should be used in place of the AV9105/6 when the reference
clock is also needed.
Computer: The AV9107C is the ideal solution for replacing
high speed oscillators and for reducing clock speeds to save
power in computers. The device provides smooth, glitch-
free frequency transitions so that the CPU can continue to
operate during slow down or speed up. The rate of
frequency change makes the AV9107C compatible with all
386DX, 386SX, 486DX, 486DX2, and 486SX devices.
Standard versions include the AV9107C-03, -05, -10,
-11. Disk Drives: Smaller than a single crystal or an
oscillator, the tiny SOIC package can be used for any
general purpose frequency generation in disk drives.
Block Diagram
9107 C Rev D 2/3/98
Pentium is a trademark of Intel Corporation
PowerPC is a trademark of Motorola Corporation
ICS reserves the right to make changes in the device data identified in this
publication without further notice. ICS advises its customers to obtain the latest
version of all device data to verify that any information being relied upon by the
customer is current and accurate.