General Description

The ICS870S208 is a low skew, eight output LVCMOS / LVTTL

Fanout Buffer with selectable divider. The ICS870S208 has two

selectable inputs that accept a variety of differential input types. The

device provides the capability to suppress any glitch at the outputs of

the device during an input clock switch to enhance clock redundancy

in fault tolerant applications. The low impedance LVCMOS outputs

are designed to drive 50??series or parallel terminated transmission

lines. The effective fanout can be increased from 8 to 16 by utilizing

the ability of the outputs to drive two series terminated lines. The

divide select inputs, DIV_SELA and DIV_SELB, control the output

frequency of each bank. The output banks can be independently

selected for ÷1 or ÷2 operation. The output enable pins assigned to

each output, support enabling and disabling of each output

individually.

The ICS870S208 is characterized at full 3.3V and 2.5V, and mixed

3.3V/2.5V output operating supply modes. Guaranteed output and

part-to-part skew characteristics make the ICS870S208 ideal for

high performance, single ended applications.

特性 Features

? Eight LVCMOS/LVTTL outputs, (2 banks of 4 outputs)

Each output has individual synchronous output enable

? Two selectable differential CLKx, nCLKx inputs

? Dual differential input pairs can accept the following differential

input levels: LVPECL, LVDS, LVHSTL, HCSL

? Maximum output frequency: 250MHz

? Selectable ?1 or ?2 operation

? Glitchless output behavior during input switch

? Output skew: 120ps (maximum), 3.3V

? Bank skew: 65ps (maximum), 3.3V

? Supply modes:

Core/Output

3.3V/3.3V

2.5V/2.5V

3.3V/2.5V

? 0°C to 70°C ambient operating temperature

? Lead-free (RoHS 6) packaging