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PDF AV9107C-11CS14 Data sheet ( Hoja de datos )
| Número de pieza | AV9107C-11CS14 | |
| Descripción | CPU Frequency Generator | |
| Fabricantes | Integrated Circuit Systems | |
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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 VDD 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.
1 page  
AV9107C
Frequency Accuracy and Calculation
The accuracy of the frequencies produced by the AV9107C-
07 depends on the input frequency and the desired actual
output frequency. The formula for calculating the exact
frequency is as follows:
Output Frequency = Input Frequency ∞
A
B
where A=2, 3, 4 ... 128, and
B=2, 3, 4 ... 32.
For example, to calculate the actual output frequency for a
video monitor expecting a 44.900 MHz clock and using a
14.318 MHz input clock, the closest A/B ratio is 69/22,
which gives an output of 44.906 MHz (within 0.02% of the
target frequency). Generally, the AV9107C-07 can produce
frequencies within 0.1% of the desired output.
Allowable Input and Output
Frequencies for Possible Options
The input frequency should be between 2 and 32 MHz,
depending on options, and the A/B ratio should not exceed
24. The output should fall in the range of 2-120 MHz,
depending on options.
Output Enable
The Output Enable feature tristates the specified output
clock pins. This places the selected output pins in a high
impedance state to allow for system level diagnostic testing.
Power-Down
If equipped, the power-down shuts off the specified PLL or
entire chip to save current. A few milliseconds are required
to reach full functioning speed from a power-down state.
Frequency Transitions
A key AV9107C-07 feature is the ability to provide glitch-
free frequency transitions across its output frequency range.
The AV9107C-07-03 provides smooth transitions between
any of the two groups of eight frequencies (when FS3=0 or
FS3=1), so that the device will switch glitch-free between
4-100 MHz and 2-50 MHz.
Slow Clock
If equipped, the Slow Clock forces a smooth frequency
transition on the VCO to an 8 MHz output on CLK1 when
Slow Clock is taken to logic low level. A few milliseconds
are required for the frequency transition into and out of the
Slow Clock Mode.
Absolute Maximum Ratings
AVDD, VDD referenced to GND ........................................................................................................................................... 7V
Operating temperature under bias ........................................................................................................................ 0°C to +70°C
Storage temperature ......................................................................................................................................... -65°C to +150°C
Voltage on I/O pins referenced to GND ........................................................................................ GND -0.5V to VDD +0.5V
Power dissipation .......................................................................................................................................................... 0.5 Watts
Stresses above those listed underAbsolute Maximum Ratings may cause permanent damage to the device.This is a stress rating
only and functional operation of the device at these or any other conditions above those indicated in the operational sections of
the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product
reliability.
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