PL133-47
Low-Power 2.25V to 3.63V DC to 150MHz 1:4 Fanout Buffer IC
Mic rel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1(408) 944 -0800 • fax +1(408) 474-1000 • www.micrel.com Rev 1/27/11 Page 4
SWITCHING CHARACTERISTICS (Commercial and Industrial Temperature Devices)
[3 ]
Measured at 1.4V, Input is 50%
Measured between 0.8V and 2.0V
Measured between 0.8V and 2.0V
Output to Output Skew
[2]
All outputs equally loaded
Propagation Delay, REF Rising
Edge to CLKX Rising Edge
[2]
Notes:
1. REF input has a threshold voltage of V
DD
/2
2. Parameter is guaranteed by design and characterization. Not 100% tested in produ ction.
3. All parameters are specified with loaded outputs .
NOISE CHARACTERISTICS (Commercial and Industrial Temperature Devices)
V
DD
=3.3V, Frequency=100MHz
Offset=12KHz ~ 20MHz
PL133-47 Additive Phase Jitter:
VDD=3.3V, CLK=100MHz, Integration Range 12KHz to 20MHz: 0.059ps typical.
-160
-150
-140
-130
-120
-110
-100
-90
-80
-70
-60
10 100 1000 10000 100000 1000000 10000000 100000000
REF Input PL133-47 Output
When a buffer is used to pass a signal then the buffer will add a little bit of its own noise. The phase noise on the output of the
buffer will be a little bit more than the phase noise in the input signal. To quantify the noise addition in the buffer we compare the
Phase Jitter numbers from the input and the output. The difference is called "Additive Phase Jitter". The formula for the Additive
Phase Jitter is as follows:
Additive Phase Jitter = (Output Phase Jitter) - (Input Phase Jitter)
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