8T49N012 Datasheet, PDF (1/28 Pages) Integrated Device Technology – Fourth Generation FemtoClock NG PLL technology

FemtoClock^® NG Crystal-to-3.3V, 2.5V
LVPECL/LVCMOS Clock Generator with
Fanout Buffer
8T49N012
DATA SHEET
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.
Pin Assignment
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
41
3
40
4
39
5
38
6
37
7
8T49N012
36
8
35
9
34
10
33
11
32
12
31
13
30
14
29
15 16 17 18 19 20 21 22 23 24 25 26 27 28
QC0
nQC0
QC1
nQC1
V_{CCO_C}
QC2
nQC2
V_EE
QC3
nQC3
QC4
nQC4
QC5
nQC5
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
• -40°C to 85°C ambient operating temperature
• 56-Lead VFQFN
• Lead-free (RoHS 6) packaging
56-Lead VFQFN, 8.0mm x 8.0mm x 0.9mm
8T49N012 REVISION 1 08/21/14
1
©2014 Integrated Device Technology, Inc.