IDT8T49N008I Datasheet, PDF (1/38 Pages) Integrated Device Technology – Fourth Generation FemtoClock NG PLL technology

Programmable FemtoClock^® NG LVPECL/LVDS
Clock Generator with 8-Outputs
IDT8T49N008I
DATASHEET
General Description
The IDT8T49N008I is an eight output Clock Synthesizer with
selectable LVDS or LVPECL outputs. The IDT8T49N008I can
synthesize any one of four frequencies from a single crystal or
reference clock. The four frequencies are selected from the
Frequency Selection Table (Table 3A) and are programmed via I²C
interface. The four predefined frequencies are selected in the user
application by two frequency selection pins. Note the desired
programmed frequencies must be used with the corresponding
crystal or clock frequency as indicated in Table 3A.
Excellent phase noise performance is maintained with IDT’s Fourth
Generation FemtoClock^® NG PLL technology, which delivers
sub-400fs RMS phase jitter.
Features
• Fourth Generation FemtoClock NG PLL technology
• Eight selectable LVPECL or LVDS outputs
• CLK, nCLK input pair can accept the following differential input
levels: LVPECL, LVDS, HCSL
• FemtoClock NG VCO Range: 1.91GHz - 2.5GHz
• RMS phase jitter at 156.25MHz (12kHz - 20MHz):
228fs (typical)
• RMS phase jitter at 156.25MHz (10kHz - 1MHz): 175fs (typical)
• Full 2.5V or 3.3V power supply
• I²C programming interface
• PCI Express (2.5 Gb/S), Gen 2 (5 Gb/s) and Gen 3 (8 Gb/s) jitter
compliant
• -40°C to 85°C ambient operating temperature
• Lead-free (RoHS 6) packaging
IDT8T49N008ANLGI REVISION A FEBRUARY 13, 2014
Pin Assignment
VEE
SCLK
SDATA
VEE
VCCA
LOCK
VEE
VCC
CLK_SEL
VEE
30 29 28 27 26 25 24 23 22 21
31
20
32
19
33
18
34
17
35
16
36
15
37
14
38
13
39
12
40
11
1 2 3 4 5 6 7 8 9 10
FSEL1
VCC
VEE
ADDR_SEL
FSEL0
nCLK
CLK
VEE
XTAL_OUT
XTAL_IN
IDT8T49N008I
40-Lead VFQFN
6mm x 6mm x 0.925mm package body
4.65mm x 4.65mm E-Pad
NL Package
1
©2014 Integrated Device Technology, Inc.