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8T49N028 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 8T49N028
기능 Multiple Frequency Clock Generator
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8T49N028 데이터시트, 핀배열, 회로
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.




8T49N028 pdf, 반도체, 판매, 대치품
8T49N028 DATA SHEET
Table 2. Pin Characteristics
Symbol
Parameter
CIN
RPULLDOWN
RPULLUP
Input Capacitance
Input Pulldown Resistor
Input Pullup Resistor
ROUT
Output Impedance LOCK
Test Conditions
VCCO_A = VCCO_B = VCCO_C =
VCCO_D = 3.465V
VCCO_A = VCCO_B = VCCO_C =
VCCO_D = 2.625V
Minimum
Typical
3.5
51
51
22
27
Maximum
Units
pF
k
k
Frequency Configuration
Table 3A. Frequency Configuration Examples
divA
Frequency
(MHz)
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
125.00
125.00
125.00
125.00
125.00
125.00
125.00
125.00
125.00
30.72
30.72
122.88
122.88
153.60
155.52
19.20
153.60
divB
Frequency
(MHz)
120.00
125.00
156.25
150.00
250.00
312.50
400.00
500.00
625.00
75.00
156.25
187.50
200.00
250.00
312.50
400.00
500.00
625.00
122.88
153.60
153.60
491.52
491.52
622.08
153.60
491.52
Input
Frequency
(MHz)
25.00
25.00
25.00
25.00
25.00
25.00
25.00
25.00
25.00
25.00
25.00
25.00
25.00
25.00
25.00
25.00
25.00
25.00
19.20
19.20
19.20
19.20
19.20
19.44
30.72
30.72
Input Clock
Divider
P
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Input Clock
Prescaler
PS
x2
x2
x2
x2
x2
x2
x2
x2
x2
x1
x2
x1
x2
x2
x2
x2
x2
x2
x2
x2
x2
x2
x2
x2
x2
x2
Feedback
Divider
M
48
50
50
48
50
50
48
50
50
90
50
90
40
40
50
40
50
50
64
64
64
64
64
64
40
40
Output
Divider A
PNA x NA
24
25
25
24
25
25
24
25
25
18
20
18
16
16
20
16
20
20
80
80
20
20
16
16
128
16
Output
Divider B
NB
20
20
16
16
10
8
6
5
4
30
16
12
10
8
8
5
5
4
20
16
16
5
5
4
16
5
VCO
Frequency
(MHz)
2400.00
2500.00
2500.00
2400.00
2500.00
2500.00
2400.00
2500.00
2500.00
2250.00
2500.00
2250.00
2000.00
2000.00
2500.00
2000.00
2500.00
2500.00
2457.60
2457.60
2457.60
2457.60
2457.60
2488.32
2457.60
2457.60
NOTE:
NOTE:
Each device supports four output frequencies (with related input or crystal value) as selected from this Register Settings Table.
XTAL operation: Using divA fOUT = fREF * PS * [M / (NA x PNA)].
Using divB fOUT = fREF / P * PS * [M / (NA x PNA)].
Using divB fOUT = fREF / P * PS * M / NB.
REVISION 1 10/16/14
4 FEMTOCLOCK® NG CRYSTAL-TO-3.3V, 2.5V MULTIPLE FREQUENCY
CLOCK GENERATOR W/FANOUT BUFFER

4페이지










8T49N028 전자부품, 판매, 대치품
8T49N028 DATA SHEET
Table 3D. PLL Frequency Range Setting
Frequency Range (MHz)
Phase Detector
10 – 120
x2 Circuitry (PS)
5 – 120
Table 3E. Feedback Divider Mn Coding
Register Bit
Mx[8:1]
Feedback Divider Mx
Do Not Use
1 thru 15
00001000
16
00001001
18
00001010
20
00001011
22
……
01111100
248
01111101
250
Table 3F. PLL Pre Output Divider PNA Coding
Register Bit
PNAx[1:0]
00
Pre Output Divider A
PNA
2
01 3
10 5
11 2
Table 3G. PLL Output Divider NA Coding
Register Bit
NAx[5:0]
000000
Output Divider N
n/a
000001
n/a
000010
2
000011
3
000100
4
000101
5
000110
6
000111
7
001000
8
001001
9
001010
10
001011
11
……
111111
63
REVISION 1 10/16/14
7 FEMTOCLOCK® NG CRYSTAL-TO-3.3V, 2.5V MULTIPLE FREQUENCY
CLOCK GENERATOR W/FANOUT BUFFER

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부품번호상세설명 및 기능제조사
8T49N028

Multiple Frequency Clock Generator

Integrated Device Technology
Integrated Device Technology

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