描述 Description

The 8T73S1802 is a fully integrated clock fanout buffer and

frequency divider. The input signal is frequency-divided and then

fanned out to one differential LVPECL and one LVCMOS output.

Each of the outputs can select its individual divider value from the

range of ÷1, ÷2, ÷4 and ÷8. Three control inputs EN, SEL0 and

SEL1 (3-level logic) are available to select the frequency dividers

and the output enable/disable state. The single-ended LVCMOS

output is phase-delayed by 650ps to minimize coupling of

LVCMOS switching into the differential output during its signal

transition.

The 8T73S1802 is optimized to deliver very low phase noise

clocks. The VBB output generates a common-mode voltage

reference for the differential clock input so that connecting the VBB

pin to an unused input (nCLK) enables to use of single-ended input

signals. The extended temperature range supports wireless

infrastructure, telecommunication and networking end equipment

requirements. The 8T73S1802 can be used with a 3.3V or a 2.5V

power supply. The device is a member of the high-performance

clock family from IDT.

特性 Features

? High-performance fanout buffer clock and fanout buffer

? Input clock signal is distributed to one LVPECL and one

LVCMOS output

? Configurable output dividers for both LVPECL and LVCMOS

outputs

? Supports clock frequencies up to 1000MHz (LVPECL) and up to

200MHz (LVCMOS)

? Flexible differential input supports LVPECL, LVDS and CML

? VBB generator output supports single-ended input signal

applications

? Optimized for low phase noise

? 650ps delay between LVCMOS and LVPECL minimizes coupling

between outputs

? Supply voltage: 3.3V or 2.5V

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

? 16 VFQFPN package (3 x 3 mm)