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MK1725 Datasheet

QUAD OUTPUT SPREAD SPECTRUM CLOCK GENERATOR

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QUAD OUTPUT SPREAD SPECTRUM CLOCK GENERATOR
DATASHEET
MK1725
Description
The MK1725 generates 4 high-quality, high-frequency
spread spectrum clock outputs. It is designed to replace
spread spectrum clock generators and a buffer in many
digital consumer applications. Using IDT’s patented Phase
Locked Loop (PLL) techniques, the device runs from a lower
frequency clock or crystal input.
The MK1725 has a 16 location ROM table which provides
maximum flexibility for system designers. The chip also has
a power down pin which can be used to reduce power.
Features
Packaged in 16-pin TSSOP
Available in Pb (lead) free package
Replaces a spread spectrum clock generator and a buffer
Input clock or crystal frequency of 20-34 MHz
Output frequency of 20-136 MHz
Four spread spectrum clock outputs
Duty cycle of 45/55
Operating voltage of 3.3 V
Advanced, low power CMOS process
Available in Commercial (0 to +70°C) and Industrial (-40
to +85°C) temperature ranges
Block Diagram
4
S3:0
X1/ICLK
20-34 MHz
crystal or
clock
X2
Optional crystal
capacitors.
VDD
3
Crystal
Oscillator
PLL/Clock
Synthesis
and
Spread
Spectrum
Circuitry
GND 3
PDTS
4
CLK1:4
IDT™ QUAD OUTPUT SPREAD SPECTRUM CLOCK GENERATOR
1
MK1725
REV G 033109


Renesas Electronics Components Datasheet

MK1725 Datasheet

QUAD OUTPUT SPREAD SPECTRUM CLOCK GENERATOR

No Preview Available !

MK1725
QUAD OUTPUT SPREAD SPECTRUM CLOCK GENERATOR
SSCG
Pin Assignment
X1 1
S0 2
S3 3
VDD 4
GND 5
S1 6
CLK1 7
CLK2 8
16 X2
15 VDD
14 PDTS
13 S2
12 VDD
11 GND
10 CLK4
9 CLK3
16 pin (173 mil) TSSOP
CLK Output Selection Table
S3 S2 S1 S0
0000
0010
0001
0011
0110
0101
0100
0111
1000
1010
1001
1011
1110
1101
1100
1111
CLK1:4
Multiplier
Spread %
1
-1%
1
-0.5%
1
+/- 0.5%
1
+/- 0.25%
2
-1%
2
-0.5%
2
+/- 0.5%
2
+/- 0.25%
4
-1%
4
-0.5%
4
+/- 0.5%
4
+/- 0.25%
1
OFF
2
OFF
4
OFF
TEST
TEST
Pin Descriptions
Pin
Number
1
2
Pin
Name
X1
S0
3
S3
4
VDD
5
GND
6
S1
7
CLK1
8
CLK2
9
CLK3
Pin
Type
Pin Description
Input Connect to a 20 to 34 MHz crystal or clock input.
Input Select pin 0. Determines frequency and spread amount on
output clocks as per table above. Internal pull-down.
Input Select pin 3. Determines frequency and spread amount on
output clocks as per table above. Internal pull-down.
Power Connect to +3.3 V.
Power Connect to ground.
Input Select pin 1. Determines frequency and spread amount on
output clocks as per table above. Internal pull-down.
Output Clock 1 output. Frequency and spread amount are determined
by table above. Weak internal pull-down when tri-state.
Output Clock 2 output. Frequency and spread amount are determined
by table above. Weak internal pull-down when tri-state.
Output Clock 3 output. Frequency and spread amount are determined
by table above. Weak internal pull-down when tri-state.
IDT™ QUAD OUTPUT SPREAD SPECTRUM CLOCK GENERATOR
2
MK1725
REV G 033109



Part Number MK1725
Description QUAD OUTPUT SPREAD SPECTRUM CLOCK GENERATOR
Maker Renesas
Total Page 3 Pages
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