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ST49C107ACF14-04

Description
Preprogrammed CPU Mother Board Frequency Generator
File Size50KB,8 Pages
ManufacturerExar [Exar Corporation]
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ST49C107ACF14-04 Overview

Preprogrammed CPU Mother Board Frequency Generator

Preliminary
FEATURES
D
Provides Reference Clock And Synthesized Clock
D
5 to 32 MHz Input Reference Frequency
D
Pin-to-Pin Compatible to Avasem AV9107
D
Programmable Analog Phase Locked Loop
ST49C107A-04
June 1997-3
Preprogrammed CPU Mother Board
Frequency Generator
...the analog plus company
TM
D
Low Power Single 5V CMOS Technology
D
Up to 16 Frequencies Stored Internally
D
8/14 pin DIP or SOIC Package
GENERAL DESCRIPTION
The ST49C107A-04 is a mask programmable monolithic
analog CMOS device designed to generate two
simultaneous clocks. The output frequency can vary from
2 to 130MHz, with up to 16 single selectable
preprogrammed frequencies stored in internal ROM.
The ST49C107A-04 is designed to replace existing CPU
mother board clocks generated from individual oscillators
ORDERING INFORMATION
Part No.
ST49C107ACF14-04
Package
14 Lead 150 Mil JEDEC SOIC
Operating
Temperature Range
0°C to 70°C
in order to reduce board space and number of oscillators.
To provide high speed and low jitter clock, the parts utilize
a high speed analog CMOS phase locked loop using
14.318 MHz system clock as the reference clock (note
that reference clock can be changed to generate optional
frequencies from a standard programmed device). The
programmed clock outputs are selectable via four
address lines.
BLOCK DIAGRAM
XTAL
XTAL
OE1 OE2
Oscillator
Circuit
Output
Buffer
1X-CLOCK
2X-CLOCK
Programmable
Counter
B
Phase
Detector
Charge
Pump
Loop
Filter
Voltage
Controlled
Oscillator
Programmable
Counter
C
Programmable
Counter
A
Voltage
Reference
Circuit
Rom Table
Select
Logic
B=5....128
A=5....128
C = 1, 2, 4
A0-A3
Figure 1. Block Diagram
Rev. P2.00
E1996
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538
z
(510) 668-7000
z
FAX (510) 668-7017
1

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