General Description

The 83940I-01 is a low skew, 1-to-18 LVPECL-to-LVCMOS/ LVTTL

Fanout Buffer. The 83940I-01 has two selectable clock inputs. The

PCLK, nPCLK pair can accept LVPECL or SSTL input levels. The

single-ended clock input accepts LVCMOS or LVTTL input levels.

The 83940I-01 is characterized at full 3.3V, full 2.5V and mixed 3.3V

input and 2.5V output operating supply modes. Guaranteed output

and part-to-part skew characteristics make the 83940I-01 ideal for

those clock distribution applications demanding well defined

performance and repeatability.

Features

• Eighteen LVCMOS/LVTTL outputs, 23 typical output impedance

• Selectable LVCMOS_CLK or LVPECL clock inputs

• PCLK, nPCLK pair can accept the following differential input

levels: LVPECL, SSTL

• LVCMOS_CLK supports the following input types: LVCMOS or

LVTTL

• Maximum output frequency: 175MHz

• Additive phase jitter, RMS: 0.108ps (typical), 3.3V/3.3V

• Output skew: 115ps (maximum)

• Part-to-part skew: 800ps (maximum), 3.3V/3.3V

• Operating supply modes:

• Core/Output

3.3V/3.3V

3.3V/2.5V

2.5V/2.5V

• -40°C to 85°C ambient operating temperature

• Available in lead-free (RoHS 6) package