fc940l Fairchild Semiconductor, fc940l Datasheet - Page 2

• Manufacturer Part Number: fc940l
• Description: Voltage Clock Distribution Device With
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Functional Description
The FC940L is a 1 to 18 Clock distribution fanout buffer.
The devices accept either a differential PECL or LVCMOS/
LVTTL input signal and generates 18 LVCMOS output sig-
nals. The SEL signal selects the differential PECL CLK
input signals when held at a logic “L” and selects the LVC-
MOS CLK input signal when held at a logic “H”. The com-
plete functional operation is shown in the Truth Table.
Logic Diagram
2
The output buffers support the ability to be powered by
either a 2.5V or 3.3V V
required to be a 3.3V.
The selectable input stage allows the device to be used in
combination with either LVTTL/LVCMOS or LVPECL clock
generation devices. The LVPECL inputs make this device
ideal for use in large clock distribution systems where there
are multiple levels of hierarchy.
CC
. The internal core voltage is