CLC018

8 x 8 Digital Crosspoint Switch, 1.4 Gbps

General Description

National’s Comlinear CLC018 is a fully differential 8x8 digital

crosspoint switch capable of operating at data rates exceed-

ing 1.4 Gbps per channel. Its non-blocking architecture uti-

lizes eight independent 8:1 multiplexers to allow each output

to be independently connected to any input and any input to

be connected to any or all outputs. Additionally, each output

can be individually disabled and set to a high-impedance

larger switch array sizes.

Low channel-to-channel crosstalk allows the CLC018 to pro-

vide superior all-hostile jitter of 50 ps

fidelity along with low power consumption of 850 mW make

the CLC018 ideal for digital video switching plus a variety of

data communication and telecommunication applications.

The fully differential signal path provides excellent noise im-

munity, and the I/Os support ECL and PECL logic levels. In

addition, the inputs may be driven single-ended or differen-

tially and accept a wide range of common mode levels in-

cluding the positive supply. Single +5V or −5V supplies or

dual +5V supplies are supported. Dual supply mode allows

the control signals to be referenced to the positive supply

(+5V) while the high-speed I/O remains ECL compatible.

The double row latch architecture utilized in the CLC018 al-

lows switch reprogramming to occur in the background dur-

ing operation. Activation of the new configuration occurs with

a single “configure” pulse. Data integrity and jitter perfor-

mance on unchanged outputs are maintained during recon-

figuration. Two reset modes are provided. Broadcast reset

results in all outputs being connected to input port DI0.

TRI-STATE Reset results in all outputs being disabled.

The CLC018 is fabricated on a high-performance BiCMOS

process and is available in a 64-lead plastic quad flat pack

(PQFP).

Features

n Fully differential signal path

n Non-Blocking

n Flexible expansion to larger array sizes with very low

power

n TRI-STATE outputs

n Double row latch architecture

n 64-lead PQFP package

Applications

n Serial digital video routing (SMPTE 259M)

n Telecom/datacom switching

n ATM SONET

Key Specifications

n Low jitter:

n Low power; 850 mW with all outputs active

n Fast output edge speeds: 250 ps

CLC018 Block Diagram

DS100088-2

DS100088-1

October 1998

© 1998 National Semiconductor Corporation

DS100088

www.national.com