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8T49N012

Description
Fourth Generation FemtoClock NG PLL technology
File Size638KB,28 Pages
ManufacturerIDT (Integrated Device Technology, Inc.)
Websitehttp://www.idt.com/
Download Datasheet View All

8T49N012 Overview

Fourth Generation FemtoClock NG PLL technology

FemtoClock
®
NG Crystal-to-3.3V, 2.5V
LVPECL/LVCMOS Clock Generator with
Fanout Buffer
General Description
The 8T49N012 is a high performance Clock Generator with
selectable LVPECL or Single-ended outputs. The 8T49N012 can
generate selectable frequencies from a crystal or a single-ended
reference clock. The frequency is selected from the Frequency
Selection Table.
Excellent phase noise performance is maintained with IDT’s Fourth
Generation FemtoClock
®
NG PLL technology.
8T49N012
DATA SHEET
Features
• Fourth Generation FemtoClock NG PLL technology
• Three differential output banks:
Bank A:
selectable between four pairs of LVPECL or four pairs
of complementary LVCMOS/LVTTL outputs
Bank B:
two pairs of LVPECL outputs
Bank C:
six pairs of LVPECL outputs
• Selectable clock input or crystal input.
• Supports 25MHz fundamental crystal or 25MHz, 50MHz,
66.67MHz clock input
• Selectable 156.25MHz, 125MHz, 100MHz clock for Bank B and
Bank C outputs
• Selectable 156.25MHz, 125MHz, 100MHz, 250MHz, 312.5MHz,
50MHz, 25MHz, 62.5MHz or 78.125MHz for Bank A outputs
• PLL lock indication (LVCMOS output)
• RMS phase jitter at 156.25MHz (12kHz - 20MHz): 0.199ps (typical)
• Power supply modes:
Core / Output
3.3V / 3.3V
3.3V / 2.5V
2.5V / 2.5V
nOE_C
Pin Assignment
nQA0_CMOS
nQA1_CMOS
nQA2_CMOS
nQA3_CMOS
QA0_CMOS
QA1_CMOS
QA2_CMOS
QA3_CMOS
V
CCO_A
V
CCO_A
• -40°C to 85°C ambient operating temperature
• 56-Lead VFQFN
• Lead-free (RoHS 6) packaging
QC0
nQC0
QC1
nQC1
V
CCO_C
QC2
nQC2
V
EE
QC3
nQC3
QC4
nQC4
QC5
nQC5
V
EE
V
EE
SE
V
CC
XTAL_SEL
PS_SEL
V
CCA
V
EE
NA_DIV1
NA_DIV0
V
CC_X
XTAL_OUT
XTAL_IN
V
EE
CLK_IN
nOE_B
56 55 54 53 52 51 50 49 48 47 46 45 44 43
1
42
2
3
4
5
6
7
8
9
10
11
12
13
41
40
39
38
37
8T49N012
V
EE
NC_DIV
36
35
34
33
32
31
30
14
29
15 16 17 18 19 20 21 22 23 24 25 26 27 28
nQB1
nQB0
V
CC
NB_DIV
V
CCO_B
nc
QB1
LOCK
QB0
V
EE
FB_DIV
56-Lead VFQFN, 8.0mm x 8.0mm x 0.9mm
8T49N012 REVISION 1 08/21/14
RESERVED
V
CCO_C
1
©2014 Integrated Device Technology, Inc.
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