MK2011

I C R O C LOC K Description The MK2011 is the ideal way to generate clocks for Fast Ethernet cards or systems. It provides 20MHz, 25MHz, and 50MHz clocks. In an 8 pin SOIC, the MK2011 can save component count, board space, and cost over surface mount crystals and oscillators, and increase reliability by eliminating two or three mechanical devices from the board. MicroClock offers many other clocks for computers and computer peripherals. Consult MicroClock when you need to remove crystals and oscillators from your board. MK2011 Fast Ethernet Clock Source Features Packaged in 8 pin SOIC Input crystal or clock frequency of 20.00 MHz Lowest jitter in the industry reliably clocks sensitive Ethernet devices. Output clock frequencies of 20.00 MHz, 25.00 MHz, and 50.00 MHz 25mA drive capability at TTL levels 3.3V or 5V±10% supply voltage Advanced, low power CMOS process Insensitive to input clock duty cycle Block Diagram VDD GND 20.00 MHz xtal or clock X1 PLL Clock Synthesis Circuitry Output Buffer Output Buffer Output Buffer 50 MHz 25 MHz Crystal Oscillator X2 20 MHz 1 Revision 120597 Printed 11/15/00 MicroClock Division of ICS1271 Parkmoor Ave.San JoseCA95126(408)295-9800tel(408)295-9818fax MDS 2011 B I C R O C LOC K Pin Assignment Suggested Layout MK2011 Fast Ethernet Clock Source 20.00 MHz in (crystal caps not shown) Pin 1 8 7 X1/ICLK VDD GND 25M 1 2 3 4 8 7 6 5 X2 20M GND 50M G 4 5 V 0.1µF 2 3 20MHz out 33Ω (optional) 6 8 pin SOIC 33Ω (...