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Integrated Circuit Systems, Inc.
AV9107C
CPU Frequency Generator
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 frequencies 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 minimum 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 applications are the AV9107C-03, and AV9107C-05. Custom masked versions, with customized frequencies and features, are available in 6-8 weeks for a small NRE.
General Description
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 3.3V10% 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, glitchfree 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
Pentium is a trademark of Intel Corporation PowerPC is a trademark of Motorola Corporation
9107 C Rev D 2/3/98
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.
AV9107C
Applications (cont.)
The most popular application is for Constant Density Recording, where its low jitter output clock provides the necessary frequencies for reading and recording. Another popular application is for slowing the disk drive CPU to save power. High Speed Systems: TheAV9107C can be used as a proximity oscillator - using a low frequency (down to 2 MHz) input to generate a high frequency clock (up to 120 MHz) near the device requiring the high frequency (depending on option). This avoids the need to route high speed traces over a long distance.
Pin Configuration
2
AV9107C
Actual Frequencies
FS1 0 0 1 1 FS0 0 1 0 1
Decoding Table for AV9107C-05, 14.318 MHz input
CLK1 40.01 50.11 66.61 80.01 MHz MHz MHz MHz
Decoding Table for AV9107C-10, 14.318 MHz input
FS1 0 0 1 1 FS0 0 1 0 1 CLK1 25.06 33.29 40.00 50.11 MHz MHz MHz MHz
Decoding Table for AV9107C-03, 14.318 MHz input
FS3 0 0 0 1 0 0 0 0 1 1 1 1 1 1 1 1 FS2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 FS1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 FS0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 CLK1 16.00 MHz 39.99 MHz 50.11 MHz 80.01 MHz 66.58 MHz 100.23 MHz* 8.02 MHz 4.01 MHz 8.02 MHz 20.00 MHz 25.06 MHz 40.01 MHz 33.29 MHz 50.11 MHz* 4.01 MHz 2.05 MHz
Decoding Table for AV9107C-11 (in MHz)
SLOW CLOCK 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 FS3 FS2 FS1 FS0 0 0 0 0 1 0 0 0 0 1 0 0 1 1 0 1 0 0 1 0 1 0 1 0 0 1 1 0 1 1 1 0 0 0 0 1 1 0 0 1 0 1 0 1 1 1 0 1 0 0 1 1 1 0 1 1 0 1 1 1 0 1 1 1 1 1 1 1 CLK1 16.00 MHz 39.99 MHz 50.11 MHz 80.01 MHz 66.58 MHz 100.23 MHz* 8.02 MHz 4.01 MHz 8.02 MHz 20.00 MHz 25.06 MHz 39.99 MHz 33.25 MHz 50.11 MHz 30.00 MHz 4.01 MHz 8.05 MHz
*@ VDD=5 volts
*@ VDD=5 volts
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AV9107C
Pin Descriptions for AV9107C-03, AV9107C-05, AV9107C-10 and AV9107C-11
-05/-10 1 5 PIN NUMBER -03 14 1 2 3 4 2 5 6 6 3 7 7 -11 14 1 2 3 4 5 PIN NAME FS0 FS1 FS2 FS3 AGND GND PD SLOW CLOCK X1/ICLK TYPE Input Input Input Input Input Input Input DESCRIPTION Frequency Select 0 for CLK1 (-03 and -11 have pull-ups). Frequency Select 1 for CLK1 (-03 and -11 have pull-ups). Frequency Select 2 for CLK1 (-03 and -11 have pull-ups). Frequency Select 3 for CLK1 (-03 and -11 have pull-ups). Analog GROUND. Digital GROUND. POWER-DOWN. Shuts off chip when low. Internal pull-up. SLOW CLOCK input. Forces CLK1 to 8 MHz (regardless of FS condition). Has internal pull-up. CRYSTAL OUTPUT or INPUT CLOCK frequency. Typically 14.318 MHz system clock. This input includes load capacitance and feedback bias for a crystal. CRYSTAL OUTPUT (No Connect when clock used.) This input includes XTAL load capacitance. OUTPUT ENABLE. Tristates REFCLK when low. Has internal pull-up. OUTPUT ENABLE. Tristates CLK1 when low. Has internal pull-up. CLOCK1 Output (see decoding tables). Digital power supply. REFERENCE CLOCK output. Produces a buffered version of the input clock or crystal frequency (typically 14.318 MHz).
4
8 9 10
8 9 10 11 12 13
X2 OE(REFCLK) OE(CLK1) CLK1 VDD REFCLK
Output Input Input Output Output
6 7 8
11 12 13
4
AV9107C
Frequency Accuracy and Calculation
The accuracy of the frequencies produced by the AV9107C07 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 where A=2, 3, 4 ... 128, and B=2, 3, 4 ... 32. A B
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
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.
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.
A key AV9107C-07 feature is the ability to provide glitchfree 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.
Frequency Transitions
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 ........................................................................................................................ 0C to +70C Storage temperature ......................................................................................................................................... -65C to +150C Voltage on I/O pins referenced to GND ........................................................................................ GND -0.5V to VDD +0.5V Power dissipation .......................................................................................................................................................... 0.5 Watts Stresses above those listed under Absolute 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.
5
AV9107C
Electrical Characteristics at 5V
Operating VDD = +4.5V to +5.5V; TA =0C to 70C unless otherwise stated
DC Characteristics PARAMETER Input Low Voltage Input High Voltage Input Low Current Input Low Current Input High Current Output Low Voltage
1
SYMBOL VIL VIH IIL IIL IIH VOL VOH IOL IOH IDD IDD (PD low) IDD (PD low) IDD (Slow Clock low) Rpu Tr Tf Tr Tf Dt
TEST CONDITIONS
MIN
TYP
MAX 0.8
UNITS V V A A A V V mA mA mA A A mA k ohms ns ns ns ns % ps ps % ps ps % MHz MHz ms ms
2.0 VIN=0V (Pull-up input) VIN=0V (Input with no pull-up) VIN=VDD IOL=10mA IOH=-30mA VOL=0.8V VOH=2.0V Unload, 50 MHz Unload, Logic Inputs 000 Unload, Logic Inputs 111 Unloaded, Slow Clock pin low -16.0 -2.0 -2.0 2.4 22.0 AC Characteristics 15pF load, 0.8 to 2.0V 15pF load, 2.0 to 0.8V 15pF load, 20% to 80% 15pF load, 80 to 20% 15pF load @ 1.4V From 20 to 100 MHz From 14 to 16 MHz From 14 to Below From 20 to 100 MHz From 14 to 16 MHz From 14 to Below 45.0 -250.0 -500.0 11.0 2.0 8 to 66.6 MHz -
-6.0 0.15 3.25 35.0 -50.0 18.0 38.0 14.0 5.5 380.0 0.60 0.40 2.0 1.0 50.0 50.0 100.0 0.2 1.0 14.3 7.58 6.0
2.0 2.0 0.40 -35.0 42.0 100.0 40.0 9.0 700.0 1.40 1.00 3.5 2.5 55.0 150.0 200.0 1.0 250.0 500.0 3.0 19.0 120.0 18.0 13.0
Output High Voltage1 Output Low Current 1 Output High Current Supply Current Supply Current; Power-down (-03 only) Supply Current; Power-down (-03 only) Supply Current; Slow Clock (-11 only) Pull-up Resistor1 Rise Time1 Fall Time
1 1
Rise Time1 Fall Time1 Duty Cycle1 Jitter, One Sigma Jitter, One Sigma Jitter, Absolute
1 1 1
Tjis Tjis Tjis Tjab Tjab Tjab
Jitter, One Sigma1 Jitter, Absolute1 Jitter, Absolute1 Input Frequency Power-up Time1 Transition Time1
1
Fi Fo Tpu Tft
Output Frequency1
Note: 1. Parameter is guaranteed by design and characterization. Not 100% tested in production.
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AV9107C
Electrical Characteristics at 3.3V
Operating VDD = +3.0V to +3.7V; TA =0C to 70C unless otherwise stated
DC Characteristics PARAMETER Input Low Voltage Input High Voltage Input Low Current Input Low Current Input High Current Output Low Voltage Output Low Current Supply Current Supply Current; Power-down (-03 only) Supply Current; Power-down (-03 only) Supply Current; Slow Clock (-11 only) Pull-up Resistor 1 Rise Time1 Fall Time
1 1
SYMBOL VIL VIH IIL IIL IIH VOL VOH IOL IOH IDD IDD (PD low) IDD (PD low) IDD (Slow Clock low) Rpu Tr Tf Dt
TEST CONDITIONS
MIN 0.7VDD
TYP -2.5 0.05 0.92 22.0 -17.0 22.0 13.0 4.0 3.5 550.0 2.2 1.2 46.0 50.0 100.0 0.4 1.0 14.3 7.58 6.0
MAX 0.20VDD 2.0 2.0 0.1 -10.0 40.0 40.0 12.0 6.0 900.0 3.5 2.5 53.0 150.0 200.0 1.0 250.0 500.0 3.0 15.3 66.6 18.0 13.0
UNITS V V A A A VDD VDD mA mA mA A A mA k ohms ns ns % ps ps % ps ps % MHz MHz ms ms
VIN=0V (Pull-up input) VIN=0V (Input with no pull-up) VIN=VDD IOL=6mA IOH=-5mA VOL=0.2VDD VOL=0.7VDD Unloaded, 50 MHz Unload, Logic Inputs 000 Unload, Logic Inputs 111 Unloaded, Slow Clock pin low
-7.0 -2.0 -2.0 0.85 15.0 -
Output High Voltage1
1 1
Output High Current
AC Characteristics 15pF load, 20% to 80% 15pF load, 80% to 20% 15pF load @ 50% From 25 to 80 MHz From 14 to 20 MHz From 14 to Below From 25 to 80 MHz From 14 to 20 MHz From 14 to Below
40.0 -250.0 -500.0 13.3 2.0 -
Duty Cycle1 Jitter, One Sigma Jitter, One Sigma Jitter, Absolute Jitter, Absolute
1 1
Tjis Tjis Tjis Tjab Tjab Tjab Fi Fo Tpu Tft
Jitter, One Sigma1
1
Jitter, Absolute1
1
Input Frequency1 Output Frequency1 Power-up Time
1
Transition Time1
8 to 66.6 MHz
-
Note: 1. Parameter is guaranteed by design and characterization. Not 100% tested in production.
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AV9107C
8-Pin DIP Package
14-Pin DIP Package Ordering Information
Example:
AV9107C-05CN8, AV9107C-10CN8, AV9107C-03CN14, AV9107C-11CN14
XXX XXXX-PPP M X#W
Lead Count & Package Width
Lead Count=1,2, or 3 digits W=0.3" SOIC or 0.6" DIP; None=Standard Width
Package Type
N=DIP (Plastic)
Pattern Number (2 or 3-digit number for parts with ROM-code patterns, if applicable) Device Type (consists of 3 or 4-digit numbers) Prefix
ICS, AV=Standard Device
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.
8
AV9107C
8-Pin Plastic SOIC Package
14-Pin SOIC Package Ordering Information
Example:
AV9107C-03CS14, AV9107C-05CS08, AV9107C-10CS08, AV9107C-11CS14
XXX XXXX-PPP M X#W
Lead Count & Package Width
Lead Count=1,2, or 3 digits W=0.3" SOIC or 0.6" DIP; None=Standard Width
Package Type
S=SOIC
Pattern Number (2 or 3-digit number for parts with ROM-code patterns) Device Type (consists of 3 or 4-digit numbers) Prefix
ICS, AV=Standard Device
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.
9

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