1FEATURES

? Dual 1:4 Differential Buffer

? Low Additive Jitter <300 fs, RMS in

10 kHz to 20 MHz

? Low Within Bank Output Skew of 35ps (Max)

? Universal Inputs Accept LVDS, LVPECL,

LVCMOS

? One Input Dedicated for Four Output Buffers

? 8 LVDS Outputs, ANSI EIA/TIA-644A Standard

Compatible

? Clock Frequency up to 800 MHz

? 2.375–2.625V Device Power Supply

? LVDS Reference Voltage, V AC_REF, Available for

Capacitive Coupled Inputs

? Industrial Temperature Range –40°C to 85°C

? Packaged in 5mm × 5mm 28-Pin QFN (RHD)

? ESD Protection Exceeds 3 kV HBM, 1 kV CDM

APPLICATIONS

? Telecommunications/Networking

? Medical Imaging

? Test and Measurement Equipment

? Wireless Communications

? General Purpose Clocking

DESCRIPTION

The CDCLVD2104 clock buffer distributes two clock

inputs (IN0, IN1) to a total of 8 pairs of differential

LVDS clock outputs (OUT0, OUT7). Each buffer block

consists of one input and 4 LVDS outputs. The inputs

can either be LVDS, LVPECL, or LVCMOS.

The CDCLVD2104 is specifically designed for driving

50-Ω transmission lines. If the input is in single ended

mode, the appropriate bias voltage (VAC_REF) should

be applied to the unused negative input pin.

Using the control pin (EN), outputs can be either

disabled or enabled. If the EN pin is left open two

buffers with all outputs are enabled, if switched to a

logical 0 both buffers with all outputs are disabled

(static logical “0”), if switched to a logical 1, one

buffer with four outputs is disabled and another buffer

with four outputs is enabled. The part supports a fail

safe function. It incorporates an input hysteresis,

which prevents random oscillation of the outputs in

absence of an input signal.

The device operates in 2.5V supply environment and

is characterized from –40°C to 85°C (ambient

temperature). The CDCLVD2104 is packaged in

small 28-pin, 5-mm × 5-mm QFN package.