MC100E196FNG

Overview

The MC100E196FNG is a 5V/EnECL Programmable Delay Chip (PDC) manufactured by onsemi in a PLCC-28 package. It provides a worst-case delay range of 2.0 ns with an approximate 20 ps per step resolution. The device supports PECL mode (VCC = 4.2 V to 5.7 V, VEE = 0 V) and NECL mode (VCC = 0 V, VEE = -4.2 V to -5.7 V). It features a linear FTUNE input for finer analog tuning, internal cascade circuitry for multi-chip expansion, and operates within a temperature range of 0°C to +85°C.

Feature Summary

• Features a programmable delay chain with digital select inputs and an analog FTUNE pin for sub-20 ps resolution enhancement.
• Includes on-chip cascade logic allowing multiple devices to be linked without external gating.
• Supports both PECL and NECL operating voltage ranges with internally generated reference voltage.

Applications

• Differential ECL input edge placement applications
• Clock deskewing and timing adjustment
• High-speed data acquisition systems

Procurement Notes

Verify the specific ordering suffix 'FNG' indicates a lead-free PLCC-28 package configuration. Confirm that the moisture sensitivity level aligns with the storage and handling requirements for Pb-Free components. Ensure the procurement source provides valid RoHS compliance documentation matching the manufacturer's specifications.

Selection Notes

Select this component when precise differential edge placement is required using EnECL logic levels. The inclusion of the FTUNE pin distinguishes it from the MC100E195, offering enhanced resolution capabilities. Consider the cascading architecture if the application demands a programmable delay range exceeding the single-device maximum.

Part Context

This part belongs to the MC10E/100E196 series of programmable delay chips designed for accurate timing control. The 100 Series variant includes temperature compensation compared to the standard 10 Series. It serves as a specialized timing element within clock distribution networks requiring fine-grained delay adjustments.

Replacement Considerations

The MC100E195 is a related device lacking the FTUNE analog tuning feature. Substitution requires evaluating whether the additional analog resolution provided by the FTUNE pin is necessary for the specific application timing constraints.

FAQ

How does the FTUNE pin improve delay resolution?

The FTUNE pin applies an analog voltage to an internal linear ramp, reducing the minimum 20 ps digital LSB resolution further. This allows for finer delay adjustments beyond the discrete digital steps.

What is the purpose of the D7 input?

The D7 input serves as the cascade control signal. When asserted, it enables the chaining of multiple PDCs to increase the total programmable delay range without requiring external gating logic.

How should the VBB pin be handled if not used?

If the VBB pin is not utilized for AC coupling or as a switching reference, it should be left open. If used, it must be decoupled via a 0.01 µF capacitor and current limited to 0.5 mA.