MPC9446 Datasheet, PDF (1/11 Pages) Motorola, Inc – 2.5V and 3.3V LVCMOS Clock Fanout Buffer

3.3V AND 2.5V, LVCMOS CLOCK FANOUT BUFFER
MPC9446
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
MPC9446
LOW VOLTAGE SINGLE OR
DUAL SUPPLY 2.5 V AND 3.3 V
LVCMOS CLOCK
DISTRIBUTION BUFFER
• 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
FA SUFFIX
32-LEAD LQFP PACKAGE
CASE 873A-04
• Tristable outputs
• 32-lead LQFP package
• 32-lead Pb-free package available
• Ambient operating temperature range of –40 to 85°C
AC SUFFIX
32-LEAD LQFP PACKAGE
Functional Description
Pb-FREE PACKAGE
CASE 873A-04
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 be-
tween 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 reference 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 Ω
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.
The device is packaged in a 7x7 mm² 32-lead LQFP package.
IDT™ / ICS™ LVCMOS CLOCK FANOUT BUFFER
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MPC9446REV 4 NOVEMBER 28, 2007