CY29949AXC

Clock Buffers, Drivers Overview

The CY29949AXC is a low-voltage clock distribution buffer supporting 200 MHz operation with 1:15 fanout. It accepts differential LVPECL or single-ended LVCMOS/LVTTL inputs and provides 15 LVCMOS/LVTTL outputs capable of driving up to 30 transmission lines. The device generates internally retimed 1X and 1/2X signals, selectable via DSEL(A:D) pins. It operates on 2.5V or 3.3V supplies (2.375V–3.6V range), features 350 ps maximum output-to-output skew, and includes three-state control via MR/OE#. Packaged in a 52-pin TQFP for commercial temperature ranges.

Clock Buffers, Drivers Feature Summary

• Supports 200 MHz clock frequencies with 1:15 ratio input/output configuration
• Generates internally retimed 1X and 1/2X signals from a 1X source
• Accepts differential LVPECL or LVCMOS/LVTTL compatible clock inputs
• Provides 15 LVCMOS/LVTTL outputs with configurable divider ratios

Clock Buffers, Drivers Applications

• Nested clock trees in synchronous systems requiring minimal skew
• Primary system clock distribution and test clock generation
• Driving series or parallel terminated 50 Ω transmission lines

Clock Buffers, Drivers Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature rating. The 'AXC' suffix denotes the Commercial temperature range (0°C to +70°C) in the 52-pin TQFP package. Confirm availability status as component lifecycles may change without notice.

Clock Buffers, Drivers Selection Notes

Select this component when a 1:15 fanout with simultaneous 1X and 1/2X signal generation is required. Ensure the design supports the specified 2.5V or 3.3V supply voltage range. Verify that the application environment falls within the commercial temperature limits defined by the AX suffix.

Clock Buffers, Drivers Part Context

The CY29949 belongs to the Cypress Semiconductor clock buffer family designed for high-frequency distribution. It is pin-compatible with MPC949 and MPC9449 devices, facilitating direct replacements in existing designs utilizing those legacy components.

Clock Buffers, Drivers Replacement Considerations

Pin-compatible substitutes include MPC949 and MPC9449. Verify electrical parameters and package dimensions before implementation.

Clock Buffers, Drivers FAQ

How are the 1X and 1/2X output signals generated?

The CY29949 generates 1X and 1/2X signals internally from the selected 1X source. These signals are retimed internally to ensure minimal skew between them.

What is the function of the MR/OE# pin?

The MR/OE# pin controls the output state. When asserted HIGH, it resets internal flip-flops and three-states the outputs. When LOW, outputs are enabled.

Can the device drive multiple traces per output?

Yes, for series terminated transmission lines, each output can drive one or two traces, providing an effective fanout of 1:30.