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PDF 8T49N012 Data sheet ( Hoja de datos )

Número de pieza 8T49N012
Descripción LVPECL/LVCMOS Clock Generator
Fabricantes Integrated Device Technology 
Logotipo Integrated Device Technology Logotipo



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No Preview Available ! 8T49N012 Hoja de datos, Descripción, Manual

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
VCC
XTAL_SEL
PS_SEL
VCCA
VEE
NA_DIV1
NA_DIV0
VCC_X
XTAL_OUT
XTAL_IN
VEE
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
VCCO_C
QC2
nQC2
VEE
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.

1 page




8T49N012 pdf
8T49N012 DATA SHEET
Function Configuration Tables
Table 3A. FB_DIV Function Table
FB_DIV
Low (default)
Mid
High
Feedback Divider
50
75
100
Table 3B. SE Function Table
SE
Low (default)
Mid
High
Bank A Output
Differential output
High Impedance
LVCMOS output
Table 3C. XTAL_SEL Function Table
XTAL_SEL
Low (default)
High
Bank A Output
CLK_IN
XTAL
Table 3D. LOCK indicaiotn Table
LOCK
Low
High
PLL Status
PLL is Out of Lock
PLL is Locked
Table 3E. nQE_B Function Table
nOE_B
Low (default)
Mid (Reserved)
High
Bank B Output
LVPECL
Reserved
High Impedance
Table 3F. nOE_C Function Table
nOE_C
Low (default)
Mid (Reserved)
High
Bank C Output
LVPECL
Reserved
High Impedance
Table 3G. Bank B and C Output Divider Table
Input Frequency
(MHz)
PS_SEL
FB_DIV
25
Low (default)
Low (default)
66.66667
Mid
Mid
50
High
Low
NB_DIV
Low (default)
Mid
High
Low (default)
Mid
High
Low (default)
Mid
High
Bank B
Frequency (MHz)
125
100
156.25
125
100
156.25
125
100
156.25
NC_DIV
Low (default)
Mid
High
Low (default)
Mid
High
Low (default)
Mid
High
Bank C
Frequency (MHz)
125
100
156.25
125
100
156.25
125
100
156.25
REVISION 1 08/21/14
5 FEMTOCLOCK® NG CRYSTAL-TO-3.3V, 2.5V LVPECL/LVCMOS
CLOCK GENERATOR

5 Page





8T49N012 arduino
Typical Phase Noise at 156.25MHz
8T49N012 DATA SHEET
156.25MHz
RMS Phase Jitter (Random)
12kHz to 20MHz = 0.199ps (typical)
Offset Frequency (Hz)
REVISION 1 08/21/14
11 FEMTOCLOCK® NG CRYSTAL-TO-3.3V, 2.5V LVPECL/LVCMOS
CLOCK GENERATOR

11 Page







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