8T74S208C-01 Datasheet, PDF (1/20 Pages) Integrated Device Technology – 2.5 V Differential LVDS Clock Divider and Fanout Buffer

2.5 V Differential LVDS Clock Divider
and Fanout Buffer
8T74S208C-01
Datasheet
General Description
The 8T74S208C-01 is a high-performance differential LVDS clock
divider and fanout buffer. The device is designed for the frequency
division and signal fanout of high-frequency, low phase-noise clocks.
The 8T74S208C-01 is characterized to operate from a 2.5V power
supply. Guaranteed output-to-output and part-to-part skew
characteristics make the 8T74S208C-01 ideal for those clock
distribution applications demanding well-defined performance and
repeatability. The integrated input termination resistors make
interfacing to the reference source easy and reduce passive
component count. Each output can be individually enabled or
disabled in the high-impedance state controlled by a I²C register. On
power-up, all outputs are disabled.
Features
One differential input reference clock
Differential pair can accept the following differential input levels:
LVDS, LVPECL, CML
Integrated input termination resistors
Eight LVDS outputs
Selectable clock frequency division of ÷1, ÷2, ÷4 and ÷8
Maximum input clock frequency: 1GHz
LVCMOS interface levels for the control inputs
Individual output enabled/ disabled by I²C interface
Output skew: 45ps (maximum)
Output rise/fall times: 370ps (maximum)
Low additive phase jitter, RMS: 96fs (typical)
Full 2.5V supply voltage
Outputs disabled at power-up
Lead-free (RoHS 6) 32-Lead VFQFN packaging
-40°C to 85°C ambient operating temperature
Block Diagram
IN
nIN
50
f_REF
÷1, ÷2,
÷4, ÷8
50
V_T
FSEL[1:0] ^{Pulldown (2)}
2
SDA ^Pullup
SCL ^Pullup
I²C
8
ADR[1:0] ^{Pulldown (2)}
2
Pin Assignment
Q0
nQ0
Q1
nQ1
Q2
nQ2
Q3
nQ3
Q4
nQ4
Q5
nQ5
Q6
nQ6
ADR1
GND
Q0
nQ0
Q1
nQ1
GND
V_DDO
32 31 30 29 28 27 26 25
1
24
2
23
3
22
4
21
8T74S208A
5
20
6
19
7
18
8
17
9 10 11 12 13 14 15 16
FSEL0
GND
nQ7
Q7
nQ6
Q6
GND
V_DDO
Q7
8T74S208C-01
nQ7
32-Lead VFQFN, 5mm x 5mm x 0.925mm
©2016 Integrated Device Technology, Inc.
1
August 22, 2016