CY29949AXIT

Clock Buffers, Drivers Overview

The CY29949AXIT is a low-voltage clock distribution buffer supporting 200 MHz operation at 2.5V or 3.3V supplies. It accepts differential LVPECL or single-ended LVCMOS/LVTTL inputs and provides 15 LVCMOS/LVTTL outputs with an effective fanout of 1:30 for series-terminated lines. The device generates internally retimed 1X and 1/2X signals to minimize skew. Key electrical parameters include a maximum output-to-output skew of 350 ps, propagation delay up to 10.6 ns, and dynamic supply current ranging from 140 mA to 330 mA depending on frequency and voltage.

Clock Buffers, Drivers Feature Summary

• Supports 200 MHz input frequencies with selectable LVPECL or LVCMOS/LVTTL inputs
• Generates 1X and 1/2X clock signals with internal retiming for minimal skew
• Provides 15 LVCMOS/LVTTL outputs capable of driving 50 Ω series or parallel terminated transmission lines
• Features three-state control via MR/OE# pin for output enable/disable

Clock Buffers, Drivers Applications

• Primary system clock distribution in high-speed digital circuits
• Test clock generation and distribution
• Clock buffering for processors and memory subsystems requiring low skew

Clock Buffers, Drivers Procurement Notes

Verify the specific ordering suffix (T) confirms tape and reel packaging for surface mount assembly. Confirm that the industrial temperature range (-40°C to +85°C) aligns with environmental requirements. Ensure power supply sequencing constraints are observed during design integration, although the datasheet notes no strict sequencing is required.

Clock Buffers, Drivers Selection Notes

Select this component when a 1:15 fanout with configurable 1X/1/2X ratios is required. Verify that the 52-TQFP package dimensions fit the PCB layout. Check that the 350 ps max skew meets system timing budgets. Consider the dynamic current consumption at target operating frequencies for power budget calculations.

Clock Buffers, Drivers Part Context

The CY29949 belongs to the Cypress Semiconductor clock buffer family, now under Infineon Technologies. It is pin-compatible with MPC949 and MPC9449 devices, facilitating direct replacements in existing designs. The AXIT suffix denotes the industrial temperature grade and tape-and-reel packaging format.

Clock Buffers, Drivers Replacement Considerations

Pin-compatible substitutes include MPC949 and MPC9449. Verify functional equivalence regarding skew specifications and drive strength before substitution.