PDF ICS2694 Data sheet ( Hoja de datos )

Número de pieza	ICS2694
Descripción	Motherboard Clock Generator
Fabricantes	Integrated Circuit Systems
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No Preview Available ! Integrated Circuit Systems, Inc. ICS2694 Motherboard Clock Generator Description The ICS2694 Motherboard Clock Generator is an integrated circuit using PLL and VCO technology to generate virtually all the clock signals required in a PC. The use of the device can be generalized to satisfy the timing needs of most digital systems by reprogramming the VCO or reconfiguring the counter stages which derive the output frequencies from the VCO’s. The primary VCO is customarily used to generate the CPU clock and is so labeled on the ICS2694. Pre-programmed frequency sets are listed on page 6. These choices were made to match the major microprocessor families. CPUSEL (0-3) allow the user to select the appropriate frequency for the application. Due to the filter in the phase-locked loop, the CPUCLK will move in a linear fashion from one frequency to a newly- selected frequency without glitches. If a fixed CPUCLK value is desired, CPUSEL (0-3) may be hard wired to the desired address with STROBE tied high. (It has a pull-up.) For board test and debug, pulling OUTPUTE to Ground will tristate all the outputs. Features • Low cost - eliminates multiple oscillators and Count Down Logic • Primary VCO has 16 Mask Programmable frequencies (normally CPU clock) • Secondary VCO has 1 Mask Programmable frequency (usually 96 MHz) • Pre-programmed versions for typical PC applications • 10 Outputs in addition to the primary CPU clock • Capability to reconfigure counter stages to change the frequencies of the outputs via mask options • Advanced PLL design • On-chip PLL filters • Very Flexible Architecture Applications • CPU clock and Co-processor clock • Hard Disk and Floppy Disk clock • Keyboard clock • Serial Port clock • Bus clock • System counting or timing functions Pin Configuration OUT2 OUT1 OUT0 OUT9 CPUCLK VSS DVDD STROBE CPUSEL0 CPUSEL1 CPUSEL2 CPUSEL3 1 2 3 4 5 6 7 8 9 10 11 12 24 OUT3 23 OUT4 22 OUT5 21 OUT6 20 OUT7 (CPUCLK/2) 19 OUT8 18 AVDD 17 XTAL2 16 XTAL1 15 AVSS 14 OUTPUTE 13 CLKIN 24-Pin DIP or SOIC ICS2694RevA1094 1 page ICS2694 AC Timing Characteristics The following notes apply to all parameters presented in this section: 1. Xtal Frequency = 14.31818 MHz 2. All units are in nanoseconds (ns). 3. Rise and fall time is between 0.8 and 2.0 VDC. 4. Output pin loading = 15pF 5. Duty cycle is measured at 1.4V. 6. Supply Voltage Range = 4.5 to 5.5 volts 7. Temperature Range = 0°C to 70°C SYMBOL PARAMETER Tpw Strobe Pulse Width Tsu Setup Time Data to Strobe Thd Hold Time Data to Strobe Tr Rise Time Tf Fall Time - Frequency Error - Maximum Frequency MIN STROBE TIMING 20 10 10 FOUT TIMING - - MAX NOTES - - - 3 Duty Cycle 40% min. to 60% max. 3 at 80 MHz 0.5 % 135 MHz Note: Pattern -004 has rising edges of CPUCLK and CPUCLK/2 matched to ± 2 ns. STROBE CPUSEL (0-3) Tpw Tsu Thd 5 5 Page

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Número de pieza	Descripción	Fabricantes
ICS2694	Motherboard Clock Generator	Integrated Circuit Systems

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