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MK1493-05GLF

P1-P3P4-P6P7-P9P10-P12P13-P14
DATASHEET
DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER MK1493-05
IDT™
DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER 1
MK1493-05 REV J 051310
Description
The MK1493-05 is a spread-spectrum clock generator used
as a companion chip with a CK410 system clock. The
device is used in a PC or embedded system to substantially
reduce electro-magnetic interference (EMI). The device
provides a differential spread-spectrum high frequency
output and a reference output clock. An SMBus is
connected to the CK410 for command and control of the
MK1493-05. The input reference clock to the MK1493-05
comes directly from the CK410. No external, expensive
crystal or crystal oscillator is required.
A 16-pin TSSOP package is employed to maximize board
space utilization.
Features
• Packaged in 16-pin TSSOP package
• Pb (lead) free package
• Single differential spread spectrum clock
• Spread spectrum for EMI control
• Supports SMBUS index read/write and blocks read/write
operations
• Uses external 14.31818 MHz clock from CK410
• Low output jitter design
• Power down mode lowers Idd
• Spread selection via hardware pins (down and center)
• Industrial temperature range available (-40°C to +85°C)
Block Diagram
Control
Logic
Config.
Reg.
CLKOUT
CLKOUT
IREF
PLL Clock
Synthesis
SDATA
REFOUT/SEL
3
VSS
VDD
Clock Buffer
SCLK
CLKIN
SEL[3:1]
Spread
Spectrum
Circuitry
2
3
PWRDN
MK1493-05
DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER CLOCK SYNTHESIZER
IDT™
DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER 2
MK1493-05 REV J 051310
Pin Assignment
Spread Spectrum Selection Table
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.
12
1
11
2
10
3
9
4
5
6
7
8
16
15
14
13
16 Pin 173 Mil (0.65mm) TSSOP
CLKIN
S3
S2
S1
PWRDWN
REF/SEL
SCLK
SDATA
VDDA
VSSA
IREF
VSSIREF
CLKOUT
CLKOUT
VSS
VDD
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
MK1493-05
DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER CLOCK SYNTHESIZER
IDT™
DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER 3
MK1493-05 REV J 051310
Pin Descriptions
Pin Pin
Name
Pin
Type
Pin Description
1 CLKIN Input 14.31818 MHz single-ended clock input.
2 S3 Input Spread spectrum select pin #3. See table above. Internal pull-down.
3 S2 Input Spread spectrum select pin #2. See table above. Internal pull-down.
4 S1 Input Spread spectrum select pin #1. See table above. Internal pull-down.
5 PWRDN Input Power down pin. Active high. Internal pull-down.
6 REF/SEL I/O Strap input for selecting CLKOUT frequency and 14.31818 MHz reference clock.
7 SCLK Input SMBus compatible clock.
8 SDATA I/O SMBus compatible data.
9 VDD Power +3.3 V power supply for logic and outputs.
10 VSS Power Ground for logic and outputs.
11 CLKOUT
Output Selectable 96/100 MHz spread spectrum differential clock output.
12 CLKOUT Output Selectable 96/100 MHz spread spectrum differential clock output.
13 VSSIREF Power Ground for current reference.
14 IREF Input Precision resistor attached to this pin is connected to the internal current reference.
15 VSSA Power Ground for PLL.
16 VDDA Power +3.3 V power supply for PLL.
P1-P3P4-P6P7-P9P10-P12P13-P14

MK1493-05GLF

Mfr. #:
Buy MK1493-05GLF
Manufacturer:
IDT
Description:
Clock Drivers & Distribution DIFFERENTIAL SPREAD SPECTRUM CLK DRIVER
Lifecycle:
New from this manufacturer.
Delivery:
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