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ICS1493-17 Datasheet

CLOCK SYNTHESIZER

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PRELIMINARY DATASHEET
CLOCK SYNTHESIZER FOR PORTABLE SYSTEMS
ICS1493-17
Description
The ICS1493-17 is a low-power, low-jitter clock
synthesizer designed to replace multiple crystals and
oscillators in portable audio/video systems. The device
generates a 37 MHz processor clock, a 48 MHz USB
clock, a fixed 22.5792 MHz audio clock, a selectable
24.576 MHz or 22.5792 MHz audio clock, and a 27MHz
reference clock for video. Using ICS’ proprietary mix of
analog and digital Phase-Locked Loop (PLL)
technology, the device spreads the frequency spectrum
of the 37 MHz output, reducing the peak amplitude of by
up to 16 dB. An output enable (OE) pin lowers the chip
power consumption while tri-stating all outputs.
Features
Extremely low operating current (11 mA)
Packaged in 20-pin QFN (Pb-free)
Input crystal or clock frequency of 27 MHz
Output reference frequency of 27 MHz
Fixed output frequencies of 37 MHz, 48 MHz and
22.5792 MHz
Selectable output frequency of either 22.5792 MHz
or 24.576 MHz
Configurable spread spectrum on 37 MHz output
Operating core voltage of 1.8 V
Output voltage of 1.8 V or 2.5 V
Advanced, low-power CMOS process
Block Diagram
SCK
SDATA
IIC
Control
Logic
27 MHz
X1
clock or
crystal input
X2
Crystal
Oscillator/
Clock
Buffer
Optional tuning
capacitors
PLL1
(Spread)
VDD
3
PLL2
PLL3
PLL4
5
GND
VDDO OE
2
37M
48M
22/24M
22M
27M
IDT™ / ICS™ CLOCK SYNTHESIZER FOR PORTABLE SYSTEMS
1
ICS1493-17 REV A 101005


Renesas Electronics Components Datasheet

ICS1493-17 Datasheet

CLOCK SYNTHESIZER

No Preview Available !

ICS1493-17
CLOCK SYNTHESIZER FOR PORTABLE SYSTEMS
Pin Assignment
GND 1
48M
VDDO
OE
VDD
6
16
GND
VDD
37M
VDDO
11 22/24M
SYNTHESIZERS
Output Enable Table
OE
Clock Output State
0
Normal Operation
1
Hi-Z
Note: OE pin has an internal pull-down resistor.
20-pin QFN
Pin Descriptions
Pin
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Pin
Name
GND
48M
VDDO
OE
VDD
22M
GND
SCK
SDATA
GND
22/24M
VDDO
37M
VDD
GND
GND
27M
Pin
Type
Pin Description
Power Connect to ground.
Output 48 MHz clock output. High impedance state when OE=1.
Power Output voltage level. Connect to +1.8 or 2.5 V. Same voltage as pin
12.
Input Output Enable pin. See table above. Internal pull-down resistor.
Power Connect to +1.8 V.
Output
Power
Input
Input
22.5792 MHz clock output. Internal pull-down. High impedance state
when OE=1.
Connect to ground.
I2C bus clock pin. Internal pull-up resistor.
I2C bus data pin. Internal pull-up resistor.
Power Connect to ground.
Output Selectable output clock of either 22.5792M or 24.576M. See table.
Internal pull-down. High impedance state. OE=1.
Power Output voltage level. Connect to +1.8 or 2.5 V. Same voltage as pin 3.
Output Spread spectrum 37 MHz clock output. See table. Internal pull-down.
High impedance state when OE=1.
Power Connect to +1.8 V.
Power Connect to ground.
Power Connect to ground.
Output 27 MHz reference clock output. Internal pull-down. High impedance
state when OE=1.
IDT™ / ICS™ CLOCK SYNTHESIZER FOR PORTABLE SYSTEMS
2
ICS1493-17 REV A 101005



Part Number ICS1493-17
Description CLOCK SYNTHESIZER
Maker Renesas
Total Page 3 Pages
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ICS1493-17 Datasheet PDF





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