MK1493-05GLF Renesas

DATASHEET DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER MK1493-05 Description Features The MK1493-05 is a spread-spectrum clock generator used Packaged in 16-pin TSSOP package as a companion chip with a CK410 system clock. The Pb (lead) free package device is used in a PC or embedded system to substantially Single differential spread spectrum clock reduce electro-magnetic interference (EMI). The device Spread spectrum for EMI control provides a differential spread-spectrum high frequency Supports SMBUS index read/write and blocks read/write output and a reference output clock. An SMBus is operations connected to the CK410 for command and control of the Uses external 14.31818 MHz clock from CK410 MK1493-05. The input reference clock to the MK1493-05 Low output jitter design comes directly from the CK410. No external, expensive crystal or crystal oscillator is required. Power down mode lowers Idd Spread selection via hardware pins (down and center) A 16-pin TSSOP package is employed to maximize board Industrial temperature range available (-40C to +85C) space utilization. Block Diagram VDD 2 PLL Clock Control SDATA CLKOUT Synthesis Logic SCLK CLKOUT 3 Config. SEL 3:1 Reg. Spread PWRDN Spectrum Circuitry CLKIN REFOUT/SEL Clock Buffer 3 IREF VSS IDT DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER 1 MK1493-05 REV J 051310MK1493-05 DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER CLOCK SYNTHESIZER Pin Assignment 1 16 CLKIN VDDA 2 15 S3 VSSA 3 14 S2 IREF 4 13 S1 VSSIREF 5 12 PWRDWN CLKOUT REF/SEL 6 11 CLKOUT SCLK 7 10 VSS SDATA 8 9 VDD 16 Pin 173 Mil (0.65mm) TSSOP Spread Spectrum Selection Table S3 S2 S1 S0 Spread% Spread Type 0000 0.8 Down 0001 1.0 Down 0010 1.25 Down 0011 1.5 Down 0100 1.75 Down 0101 2.0 Down 0110 2.5 Down 0111 3.0 Down 1000 +0.3 Center 1001 +0.4 Center 1010 +0.5 Center 1011 +0.6 Center 1100 +0.8 Center 1101 +1.0 Center 1110 +1.25 Center 1111 +1.5 Center The spread enable and spread select 3:0 SMBus register bits control spread modulation and enable/disable. The CLKIN clock input and REF clock output will not have or be spread. At device power-up the spread-spectrum is enabled and hardware control is enabled. The S0 configuration bit is hard-coded to zero when hardware control mode is selected. IDT DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER 2 MK1493-05 REV J 051310