2309A-1HDCGI8

Overview

The Renesas Electronics Corporation IDT2309A-1HDCGI8 is a high-speed, 3.3V zero delay clock buffer featuring an on-chip phase-lock loop (PLL). It accepts one reference input and distributes the clock to two banks of four low-skew outputs (CLKA1–4 and CLKB1–4), plus an internal feedback CLKOUT pin. The -1H suffix indicates a high-drive version with faster rise and fall times compared to the standard drive variant. Operating frequencies range from 10 MHz to 133 MHz. The device supports separate output enables for each bank via S1 and S2 select inputs, allowing tri-state control or PLL bypass modes. It is characterized for industrial temperature operation (-40°C to +85°C) and housed in a 16-pin SOIC package.

Feature Summary

• Zero Delay Buffer: Aligns phase between incoming REF clock and output clocks using an on-chip PLL with feedback from the CLKOUT pad.
• High Drive Capability: The -1H variant provides higher drive strength (12mA) with reduced rise/fall times (1.5 ns max) compared to the standard -1 version.
• Low Skew and Jitter: Achieves output-to-output skew of less than 250 ps and cycle-to-cycle jitter under 200 ps at 66.66 MHz.
• Flexible Control: Features separate output enable controls for Bank A and Bank B via S1/S2 pins, supporting tri-state, PLL bypass, and power-down modes.

Applications

• SDRAM Clock Distribution
• Telecom Systems
• Datacom Equipment
• PC Motherboards and Workstations
• Critical Path Delay Designs

Procurement Notes

Verify the ordering code matches the specific package and temperature grade required. The 'I' suffix denotes Industrial temperature range (-40°C to +85°C), while 'G' typically indicates lead-free/RoHS compliance. Confirm the 'H' suffix is present if high drive strength and faster slew rates are necessary for the design. Ensure the package type corresponds to the PCB footprint, as this part number specifies the SOIC package.

Selection Notes

Select the IDT2309A-1HDCGI8 when high drive current and faster edge rates are required for heavy loads or long traces. The standard IDT2309A-1DCGI8 offers lower drive (8mA) which may suffice for lighter loads. Both variants share identical electrical characteristics regarding skew, jitter, and frequency range. Ensure all outputs, including unused ones, are loaded equally to maintain zero I/O delay performance.

Part Context

The IDT2309A is a 16-pin derivative of the IDT2305A, expanding the output capacity from five to nine driven outputs (two banks of four). It belongs to the IDT2309 family of zero delay buffers. The manufacturer Integrated Device Technology (IDT) was acquired by Renesas Electronics Corporation, which now markets these components under the Renesas brand.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Designers should consult official Renesas documentation for cross-reference information or verify compatibility with similar zero-delay buffers from other manufacturers based on pinout and electrical specifications.

FAQ

How is zero delay achieved in the IDT2309A?

Zero delay is achieved by aligning the phase between the incoming REF clock and the output clocks. This is done using an on-chip PLL where the feedback is obtained from the CLKOUT pad. All outputs, including CLKOUT, must be equally loaded to ensure true zero I/O delay.

What is the difference between the IDT2309A-1 and IDT2309A-1H?

The primary difference is the drive strength and switching speed. The -1H version is a high-drive device with a maximum rise/fall time of 1.5 ns and can sink/source up to 12 mA. The standard -1 version has a maximum rise/fall time of 2.5 ns and a drive capability of 8 mA.

Can the outputs be controlled independently?

Yes, the device allows separate output enable control for each bank. Setting S1 and S2 inputs to specific logic levels can place Bank A, Bank B, or both into tri-state mode, or bypass the PLL to drive outputs directly from the REF input.