ICS83940DYI

Clock Buffers, Drivers Overview

The ICS83940DYI is a low skew, 1-to-18 LVPECL-to-LVCMOS/LVTTL fanout buffer manufactured by Integrated Device Technology (IDT). It features two selectable clock inputs: the PCLK/nPCLK differential pair accepts LVPECL, CML, or SSTL levels, while the single-ended LVCMOS_CLK input supports LVCMOS or LVTTL. The device provides eighteen low impedance LVCMOS/LVTTL outputs designed to drive 50Ω terminated transmission lines. It operates at frequencies up to 250 MHz with maximum output skew of 150 ps and part-to-part skew of 750 ps. Supply modes include 3.3V/3.3V, 3.3V/2.5V, and 2.5V/2.5V.

Clock Buffers, Drivers Feature Summary

• Eighteen LVCMOS/LVTTL outputs for high-speed clock distribution
• Selectable differential (LVPECL/CML/SSTL) or single-ended (LVCMOS/LVTTL) inputs via CLK_SEL pin
• Maximum output frequency of 250 MHz with guaranteed low skew characteristics
• Operates in mixed voltage modes: Core 3.3V/Output 2.5V or unified 3.3V/3.3V and 2.5V/2.5V

Clock Buffers, Drivers Applications

• Clock distribution networks requiring low skew performance
• Systems interfacing LVPECL sources to LVCMOS/LVTTL loads
• High-speed data acquisition and communication equipment

Clock Buffers, Drivers Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and lead-free status. The base model ICS83940DYI corresponds to the standard RoHS 5 configuration in the 32-lead LQFP package. Suffixes such as 'LF' indicate lead-free compliance, while 'T' denotes tape and reel shipping. Confirm thermal requirements and ambient operating temperature ranges (-40°C to 85°C) match the application environment before procurement.

Clock Buffers, Drivers Selection Notes

Select this component when a single differential or single-ended clock source must be distributed to eighteen LVCMOS or LVTTL destinations. Ensure the input signal levels (LVPECL, CML, SSTL, LVCMOS, or LVTTL) are compatible with the selected input pin configuration controlled by the CLK_SEL pin. Verify that the required supply voltage mode (3.3V core/output or mixed 3.3V/2.5V) aligns with the system power architecture. Check that the maximum operating frequency does not exceed 250 MHz for 3.3V operation or 200 MHz for 2.5V operation.

Clock Buffers, Drivers Part Context

The ICS83940DYI belongs to the IDT 83940 series of low skew fanout buffers. This series is designed for applications demanding precise timing and repeatability. The device was originally produced by Integrated Device Technology, which has since been acquired by Renesas Electronics. The 'DYI' suffix specifically identifies the 32-lead LQFP package variant.

Clock Buffers, Drivers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided datasheet. Designers should consult the manufacturer's current product portfolio for cross-reference information, as IDT products may have been rebranded under Renesas Electronics following corporate acquisitions.