AV9107C Integrated Circuit Systems, Inc. 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 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. 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 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 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 Decoding Table for AV9107C-10, 14.318 MHz input Decoding Table for AV9107C-05, 14.318 MHz input FS1 FS0 0 0 1 1 0 1 0 1 CLK1 40.01 50.11 66.61 80.01 MHz MHz MHz MHz FS2 FS1 FS0 CLK1 0 0 0 1 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 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 FS0 0 0 1 1 0 1 0 1 CLK1 25.06 33.29 40.00 50.11 MHz MHz MHz MHz Decoding Table for AV9107C-11 (in MHz) Decoding Table for AV9107C-03, 14.318 MHz input FS3 FS1 SLOW CLOCK 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 *@ VDD=5 volts *@ VDD=5 volts 3 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 AV9107C Pin Descriptions for AV9107C-03, AV9107C-05, AV9107C-10 and AV9107C-11 -05/-10 PIN NUMBER -03 PIN NAME -11 TYPE DESCRIPTION 1 14 14 FS0 Input Frequency Select 0 for CLK1 (-03 and -11 have pull-ups). 5 1 1 FS1 Input Frequency Select 1 for CLK1 (-03 and -11 have pull-ups). 2 2 FS2 Input Frequency Select 2 for CLK1 (-03 and -11 have pull-ups). 3 3 FS3 Input Frequency Select 3 for CLK1 (-03 and -11 have pull-ups). 4 4 AGND 5 5 GND 2 6 - Analog GROUND. - Digital GROUND. PD Input POWER-DOWN. Shuts off chip when low. Internal pull-up. 6 SLOW CLOCK Input Input 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). 3 7 7 X1/ICLK 4 8 8 X2 9 9 OE(REFCLK) Input 10 10 OE(CLK1) Input 6 11 11 CLK1 7 12 12 VDD 8 13 13 REFCLK Output Output - Digital power supply. Output 4 REFERENCE CLOCK output. Produces a buffered version of the input clock or crystal frequency (typically 14.318 MHz). AV9107C Allowable Input and Output Frequencies for Possible Options 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. 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. A B 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. 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. 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. Slow Clock Frequency Transitions 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. 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 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 =0°C to 70°C unless otherwise stated DC Characteristics PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS 0.8 V Input Low Voltage VIL Input High Voltage VIH 2.0 - - V Input Low Current IIL VIN=0V (Pull-up input) -16.0 -6.0 - µA Input Low Current IIL -2.0 - 2.0 µA -2.0 - 2.0 µA IIH VIN=0V (Input with no pull-up) VIN=VDD 1 VOL IOL=10mA - 0.15 0.40 V Output High Voltage1 VOH IOH=-30mA 2.4 3.25 - V Output Low Current 1 IOL VOL=0.8V 22.0 35.0 - mA 1 IOH VOH=2.0V - -50.0 -35.0 mA IDD Unload, 50 MHz - 18.0 42.0 mA IDD (PD low) Unload, Logic Inputs 000 - 38.0 100.0 µA IDD (PD low) Unload, Logic Inputs 111 - 14.0 40.0 µA Unloaded, Slow Clock pin low - 5.5 9.0 mA - 380.0 700.0 k ohms ns Input High Current Output Low Voltage 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 IDD (Slow Clock low) Rpu Tr AC Characteristics 15pF load, 0.8 to 2.0V - 0.60 1.40 Fall Time Tf 15pF load, 2.0 to 0.8V - 0.40 1.00 ns Rise Time1 Tr 15pF load, 20% to 80% - 2.0 3.5 ns Fall Time1 Tf 15pF load, 80 to 20% Duty Cycle1 Dt 15pF load @ 1.4V Jitter, One Sigma 1 Tjis From 20 to 100 MHz Jitter, One Sigma 1 Tjis Jitter, One Sigma1 Tjis 1 Tjab From 20 to 100 MHz -250.0 - 250.0 ps Jitter, Absolute1 Tjab From 14 to 16 MHz -500.0 - 500.0 ps Tjab From 14 to Below - 1.0 3.0 % Rise Time1 1 Jitter, Absolute Jitter, Absolute1 Input Frequency 1 - 1.0 2.5 ns 45.0 50.0 55.0 % - 50.0 150.0 ps From 14 to 16 MHz - 100.0 200.0 ps From 14 to Below - 0.2 1.0 % Fi 11.0 14.3 19.0 MHz Output Frequency1 Fo 2.0 - 120.0 MHz Power-up Time1 Tpu - 7.58 18.0 ms Transition Time1 Tft - 6.0 13.0 ms 8 to 66.6 MHz Note: 1. Parameter is guaranteed by design and characterization. Not 100% tested in production. 6 AV9107C Electrical Characteristics at 3.3V Operating VDD = +3.0V to +3.7V; TA =0°C to 70°C unless otherwise stated DC Characteristics PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS Input Low Voltage VIL - - 0.20VDD V Input High Voltage VIH 0.7VDD - - V Input Low Current IIL VIN=0V (Pull-up input) -7.0 -2.5 - µA Input Low Current IIL -2.0 - 2.0 µA -2.0 - 2.0 µA IIH VIN=0V (Input with no pull-up) VIN=VDD 1 VOL IOL=6mA - 0.05 0.1 VDD Output High Voltage1 VOH IOH=-5mA 0.85 0.92 - VDD IOL VOL=0.2VDD 15.0 22.0 - mA IOH VOL=0.7VDD - -17.0 -10.0 mA IDD Unloaded, 50 MHz - 22.0 40.0 mA IDD (PD low) Unload, Logic Inputs 000 - 13.0 40.0 µA IDD (PD low) Unload, Logic Inputs 111 - 4.0 12.0 µA Unloaded, Slow Clock pin low - 3.5 6.0 mA - 550.0 900.0 k ohms - 2.2 3.5 ns Input High Current Output Low Voltage Output Low Current 1 Output High Current 1 Supply Current Supply Current; Power-down (-03 only) Supply Current; Power-down (-03 only) Supply Current; Slow Clock (-11 only) Pull-up Resistor 1 IDD (Slow Clock low) Rpu Tr AC Characteristics 15pF load, 20% to 80% Fall Time Tf 15pF load, 80% to 20% Duty Cycle1 Dt 15pF load @ 50% 1 Tjis From 25 to 80 MHz Jitter, One Sigma1 Tjis From 14 to 20 MHz 1 Rise Time1 1 Jitter, One Sigma - 1.2 2.5 ns 40.0 46.0 53.0 % - 50.0 150.0 ps - 100.0 200.0 ps - 0.4 1.0 % Tjis From 14 to Below 1 Tjab From 25 to 80 MHz -250.0 - 250.0 ps Jitter, Absolute1 Tjab From 14 to 20 MHz -500.0 - 500.0 ps 1 Tjab From 14 to Below Jitter, One Sigma Jitter, Absolute - 1.0 3.0 % Input Frequency1 Fi 13.3 14.3 15.3 MHz Output Frequency1 Fo 2.0 - 66.6 MHz - 7.58 18.0 ms - 6.0 13.0 ms Jitter, Absolute Power-up Time 1 Transition Time1 Tpu Tft 8 to 66.6 MHz Note: 1. Parameter is guaranteed by design and characterization. Not 100% tested in production. 7 AV9107C 8-Pin DIP Package 14-Pin DIP Package Ordering Information AV9107C-05CN8, AV9107C-10CN8, AV9107C-03CN14, AV9107C-11CN14 Example: 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 8 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 8-Pin Plastic SOIC Package 14-Pin SOIC Package Ordering Information AV9107C-03CS14, AV9107C-05CS08, AV9107C-10CS08, AV9107C-11CS14 Example: 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 9 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.