8T49N028 Datasheet PDF - Integrated Device Technology
| Part Number | 8T49N028 | |
| Description | Multiple Frequency Clock Generator | |
| Manufacturers | Integrated Device Technology | |
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FemtoClock® NG Crystal-to-3.3V, 2.5V
Multiple Frequency Clock Generator
w/Fanout Buffer
8T49N028
DATA SHEET
General Description
The 8T49N028 is a low RMS phase jitter Clock Synthesizer with
selectable internal crystal oscillator or external clock references and
eight outputs, configurable as either LVDS, LVPECL or High
Impedance.
After power up, two frequency select pins determine one of up to four
different sets of factory preprogrammed crystal or input frequency
and output frequency configurations. From a single input reference,
as many as three different output frequencies may be selected for
the output banks: two of these frequencies can be generated by the
internal crystal oscillator, and/or external clock pre-divider, and/or A
output divider, and/or B output divider. The third output frequency is
from the B output divider. Device pre-programming can be
overwritten through the provided I2C interface.
Examples of valid frequency configuration setups illustrate this
device's flexibility, and are shown in Table 3A. The specific internal
register settings for each of the four frequency sets are specified by
an IDT order code. Custom codes can be provided by contacting
IDT.
Features
• Fourth Generation FemtoClock NG PLL technology
• Eight selectable LVPECL or LVDS outputs (bank selectable, two
output channels per bank)
• CLK, nCLK input pair can accept the following differential input
levels: LVPECL, LVDS, HCSL
• FemtoClock NG VCO Range: 1.92GHz - 2.5GHz
• Bank A and B output frequencies are mux selectable from internal
crystal oscillator, reference clock input, output divider A or output
divider B
• Clock from OUTPUT DIVIDER A, RMS phase jitter at 156.25MHz
(12KHz - 20MHz): 225fs (typical)
• Clock from OUTPUT DIVIDER B, RMS phase jitter at 156.25MHz
(12KHz - 20MHz): 219fs (typical)
• Clock from OUTPUT DIVIDER B, RMS phase jitter at 156.25MHz
(10kHz - 1MHz): 165fs (typical) Full 2.5V or 3.3V power supply
• 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
Pin Assignment
Q0
nQ0
Q1
nQ1
VCCO_A
nc
nc
VCCO_B
Q2
nQ2
Q3
nQ3
48 47 46 45 44 43 42 41 40 39 38 37
1 36
2 35
3 34
4 33
5 32
6 31
7 8T49N028 30
8 29
9 28
10 27
11 26
12 25
13 14 15 16 17 18 19 20 21 22 23 24
VEE
Q4
nQ4
Q5
nQ5
VCCO_C
VCCO_D
Q6
nQ6
Q7
nQ7
VEE
8T49N028 REVISION 1 10/16/14
48-pin, 7mm x 7mm VFQFN Package
1 ©2014 Integrated Device Technology, Inc.
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8T49N028 DATA SHEET
Table 3B. I2C Register Map
Binary
Register Bit
Register
Register Address
D7
D6
D5
D4
D3
D2
0 00000
0
M0[7]
M0[6]
M0[5]
M0[4]
M0[3]
1 00001
0
M1[7]
M1[6]
M1[5]
M1[4]
M1[3]
2 00010
0
M2[7]
M2[6]
M2[5]
M2[4]
M2[3]
3 00011
0
M3[7]
M3[6]
M3[5]
M3[4]
M3[3]
4 00100
0
NB0[6]
NB0[5]
NB0[4]
NB0[3]
NB0[2]
5 00101
0
NB1[6]
NB1[5]
NB1[4]
NB1[3]
NB1[2]
6 00110
0
NB2[6]
NB2[5]
NB2[4]
NB2[3]
NB2[2]
7 00111
0
NB3[6]
NB3[5]
NB3[4]
NB3[3]
NB3[2]
8 01000
BYPASS0
PS0[1]
PS0[0]
P0[1]
P0[0]
9 01001
BYPASS1
PS1[1]
PS1[0]
P1[1]
P1[0]
10 01010
BYPASS2
PS2[1]
PS2[0]
P2[1]
P2[0]
11 01011
BYPASS3
PS3[1]
PS3[0]
P3[1]
P3[0]
12 01100 OED0
OEC0
OEB0
OEA0
LVDS_
SELD0
LVDS_
SELC0
13 01101 OED1
OEC1
OEB1
OEA1
LVDS_
SELD1
LVDS_
SELC1
14 01110 OED2
OEC2
OEB2
OEA2
LVDS_
SELD2
LVDS_
SELC2
15 01111 OED3
OEC3
OEB3
OEA3
LVDS_
SELD3
LVDS_
SELC3
16 10000
0
0
0
0
MUXB0[1]
MUXB0[0]
17 10001
0
0
0
0
MUXB1[1]
MUXB1[0]
18 10010
0
0
0
0
MUXB2[1]
MUXB2[0]
19 10011
0
0
0
0
MUXB3[1]
MUXB3[0]
20
10100
PNA0[1]
PNA0[0]
NA0[5]
NA0[4]
NA0[3]
NA0[2]
21
10101
PNA1[1]
PNA1[0]
NA1[5]
NA1[4]
NA1[3]
NA1[2]
22
10110
PNA2[1]
PNA2[0]
NA2[5]
NA2[4]
NA2[3]
NA2[2]
23
10111
PNA3[1]
PNA3[0]
NA3[5]
NA3[4]
NA3[3]
NA3[2]
NOTE: OEx, LVDS_SELx registers control the Output Bank State and not the Individual Output Channel State.
D1
M0[2]
M1[2]
M2[2]
M3[2]
NB0[1]
NB1[1]
NB2[1]
NB3[1]
CP0[1]
CP1[1]
CP2[1]
CP3[1]
LVDS_
SELB0
LVDS_
SELB1
LVDS_
SELB2
LVDS_
SELB3
MUXA0[1]
MUXA1[1]
MUXA2[1]
MUXA3[1]
NA0[1]
NA1[1]
NA2[1]
NA3[1]
D0
M0[1]
M1[1]
M2[1]
M3[1]
NB0[0]
NB1[0]
NB2[0]
NB3[0]
CP0[0]
CP1[0]
CP2[0]
CP3[0]
LVDS_
SELA0
LVDS_
SELA1
LVDS_
SELA2
LVDS_
SELA3
MUXA0[0]
MUXA1[0]
MUXA2[0]
MUXA3[0]
NA0[0]
NA1[0]
NA2[0]
NA3[0]
REVISION 1 10/16/14
5 FEMTOCLOCK® NG CRYSTAL-TO-3.3V, 2.5V MULTIPLE FREQUENCY
CLOCK GENERATOR W/FANOUT BUFFER
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| Information | Total 30 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ 8T49N028.PDF Datasheet ] | |
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