CY28SRC01 Datasheet, PDF (1/9 Pages) SpectraLinear Inc – PCI-Express Clock Generator

Features
• One 100 MHz differential SRC clocks
• Low-voltage frequency select input
• I²C support with readback capabilities
PRELIMINARY
CY28SRC01
PCI-Express Clock Generator
• Ideal Lexmark Spread Spectrum profile for maximum
electromagnetic interference (EMI) reduction
• 3.3V power supply
• 16-pin TSSOP package
Block Diagram
XIN
XOUT
XTAL
OSC
PLL Ref Freq
PLL
Divider
Network
IREF
SDATA
SCLK
I²C
Logic
VDD_SRC
SRCT0,SRCC0
Pin Configuration
VSS_SRC
VDD_SRC
SRCC0
SRCT0
VDD_SRC
VSS_SRC
IREF
VSSA
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
16 TSSOP
VDD_SRC
SDATA
SCLK
XOUT
XIN
VDD_REF
VSS_REF
VDDA
Pin Description
Pin No.
7
Name
IREF
14
SCLK
15
SDATA
3,4
SRC[T/C]0
12
13
2, 5,16
1,6
9
8
11
10
XIN
XOUT
VDD_SRC
VSS_SRC
VDDA
VSSA
VDD_REF
VSS_REF
Type
Description
I A precision resistor (475:) attached to this pin is connected to the internal current
reference.
I,PU SMBus compatible SCLOCK.This pin has an internal pull-up, but is tri-stated in
powerdown.
I/O, PU SMBus compatible SDATA.This pin has an internal pull-up, but is tri-stated in
powerdown.
O, DIF Differential Selectable Serial reference clock.
Intel Type-X buffer.
Includes overclock support through SMBUS
I 14.318-MHz Crystal Input
O 14.318-MHz Crystal Output
PWR 3.3V power supply for SRC outputs
GND Ground for SRC outputs
PWR 3.3V power supply for PLL
GND Analog Ground
PWR Power for Xtal
GND Ground for Xtal
Rev 1.0, November 20, 2006
2200 Laurelwood Road, Santa Clara, CA 95054
Tel:[phone] Fax:[phone]
Page 1 of 9
www.SpectraLinear.com