FE AT UR E S
Output fanout buffer for DC to 134MHz
Output Options:
o 1:5 output fanout with PL123-05
o 1:9 output fanout with PL123-09
Low power consumption for portable applications
Low input-output delay
Output-Output skew less than 250ps
Low Additive Phase Jitter of 60fs RMS
2.5V to 3.3V, ±10% operation
1.8V ±10% operation up to 67MHz
Operating temperature range from -40°C to 85°C
Available in 16-Pin SOP (PL123-09) and 8-Pin
SOP (PL123-05). Both are GREEN/RoHS packag-
es.
PL123-05N/-09N
Low Skew Fanout Buffer
DESCRIPTION
The PL123-05N and PL123-09N are a low-cost
fanout buffers for distributing high-speed clocks with
low output to output skew and preserving low noise
properties. The fanout buffers accept an input from
DC to 134MHz and provide 5 or 9 outputs of the same
frequency. A typical PL123-09N application for driving
SDRAM in PC systems would use eight outputs to
drive two DIMMs, or four SO-DIMMs, with the re-
maining output used for driving an external feed-
back to a PLL. A typical PL123-05N application is
to fanout a low noise CMOS clock oscillator to 5
low noise CMOS clocks.
These parts are not intended for 5V input-tolerant ap-
plications.
BLOCK DIAGRAM AND PACKAGE PINOUT
REF
REF
CLK1
CLK2
CLK3
CLK4
CLK5
CLK1
CLK2
CLK3
CLK4
CLK5
CLK6
CLK7
CLK8
CLK9
REF
CLK1
CLK2
GND
18
27
36
45
SOP-8L
CLK5
CLK4
VDD
CLK3
REF
CLK1
CLK2
VDD
GND
CLK3
CLK4
VDD
1
2
3
4
5
6
7
8
16 CLK9
15 CLK8
14 CLK7
13 VDD
12 GND
11 CLK6
10 CLK5
9 GND
SOP-16L
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1(408) 944-0800 • fax +1(408) 474-1000 • www.micrel.com Rev 03/15/12 Page 1
