DATASHEET

3.3V and 2.5V, LVCMOS Clock Fanout Buffer

MPC9446

NRND

MPC9446 REVISION 5 DECEMBER 21, 2012

1

©2012 Integrated Device Technology, Inc.

The MPC9446 is a 2.5 V and 3.3 V compatible 1:10 clock distribution buffer designed

for low-voltage mid-range to high-performance telecom, networking and computing

applications. Both 3.3 V, 2.5 V and dual supply voltages are supported for mixed-voltage

applications. The MPC9446 offers 10 low-skew outputs and 2 selectable inputs for clock

redundancy. The outputs are configurable and support 1:1 and 1:2 output to input

frequency ratios. The MPC9446 is specified for the extended temperature range of –40

C

to 85

C.

Features

•

Configurable 10 outputs LVCMOS clock distribution buffer

•

Compatible to single, dual and mixed 3.3 V/2.5 V voltage supply

•

Wide range output clock frequency up to 250 MHz

•

Designed for mid-range to high-performance telecom, networking

and computer applications

•

Supports applications requiring clock redundancy

•

Maximum output skew of 200 ps (150 ps within one bank)

•

Selectable output configurations per output bank

•

Tristable outputs

•

32-lead LQFP package, Pb-free

•

Ambient operating temperature range of –40 to 85

C

Functional Description

The MPC9446 is a full static fanout buffer design supporting clock frequencies up to 250

MHz. The signals are generated and retimed on-chip to ensure minimal skew between the

three output banks. Two independent LVCMOS compatible clock inputs are available. This

feature supports redundant clock sources or the addition of a test clock into the system design. Each of the three output banks can be

individually supplied by 2.5 V or 3.3 V supporting mixed voltage applications. The FSELx pins choose between division of the input refer-

ence frequency by one or two. The frequency divider can be set individually for each of the three output banks. The MPC9446 can be

rese,t and the outputs are disabled by deasserting the MR/OE pin (logic high state). Asserting MR/OE will enable the outputs.

All inputs accept LVCMOS signals while the outputs provide LVCMOS compatible levels with the capability to drive terminated 50



transmission lines. Please consult the MPC9456 specification for a 1:10 mixed voltage buffer with LVPECL compatible inputs. For series

terminated transmission lines, each of the MPC9446 outputs can drive one or two traces giving the devices an effective fanout of 1:20.

AC SUFFIX

32-LEAD LQFP PACKAGE

Pb-FREE PACKAGE

CASE 873A-04

MPC9446

LOW VOLTAGE SINGLE OR

DUAL SUPPLY 2.5 V AND 3.3 V

LVCMOS CLOCK

DISTRIBUTION BUFFER

NRND – Not Recommend for New Designs