MC100EP195FAR2G

Overview

The MC100EP195FAR2G is a 3.3 V ECL Programmable Delay Chip (PDC) designed for clock deskewing and timing adjustment in high-speed systems. It provides variable delay of differential NECL/PECL input transitions with a digitally selectable resolution of approximately 10 ps. The device features a programmable range from 0 ns to 10 ns, with a total delay range spanning 2.2 ns to 12.2 ns due to fixed internal gate delays. It supports maximum input clock frequencies exceeding 1.2 GHz typical. Operating modes include PECL (VCC = 3.0 V to 3.6 V, VEE = 0 V) and NECL (VCC = 0 V, VEE = −3.0 V to −3.6 V). The component is housed in a 32-lead LQFP package.

Feature Summary

• Provides precise programmable delay adjustment using a matrix of gates and multiplexers controlled by 10-bit data select inputs.
• Supports cascading multiple devices via dedicated cascade outputs to extend the total programmable delay range beyond single-chip limits.
• Features flexible input threshold control allowing compatibility with LVCMOS, LVTTL, or ECL logic levels through configurable reference pins.

Applications

• Multi-channel deskewing to eliminate timing skews caused by impedance or cable length differences in high-speed systems.
• Precision measurement of unknown device delays by comparing programmed chip delay against an unknown signal path.
• Timing adjustment and synchronization in high-frequency digital communication interfaces.

Procurement Notes

Verify the ordering suffix 'R2G' corresponds to the specific tape and reel packaging configuration required for automated assembly processes. Confirm that the lead-free status aligns with environmental compliance standards applicable to the target manufacturing region. Ensure the LQFP-32 package dimensions match the PCB footprint design constraints before finalizing procurement orders.

Selection Notes

Select this component when applications require sub-nanosecond resolution timing adjustments for differential ECL signals. Consider the cascading capability if the system demands a programmable range exceeding 10 ns. Evaluate power supply requirements carefully, as the device operates distinctly in either PECL or NECL configurations based on the VCC and VEE connections. Verify input voltage level compatibility with the selected mode using the VCF and VEF pins.

Part Context

This part belongs to the MC100EP195 series of programmable delay chips manufactured by onsemi. It is specifically the tape and reel variant of the standard MC100EP195FAG. The series is characterized by temperature compensation and safety clamps on inputs. It serves as a critical timing element within the broader 100EP family of high-speed ECL logic components.

Replacement Considerations

The MC100EP195FAR2G is a direct replacement for the discontinued MC100EP195FAR2. Both parts share identical electrical specifications and pinouts, differing only in the RoHS-compliant packaging suffix. No functional modifications are required when transitioning between these two specific part numbers.

FAQ

How is the input threshold configured for different logic families?

The input threshold is controlled by the VCF and VEF pins. For LVCMOS, leave both open; for ECL, short them together; for LVTTL, connect a 1.5 V reference to VCF while leaving VEF open.

What is the function of the D10 input pin?

The D10 input controls the CASCADE and CASCADE outputs, enabling the chaining of multiple EP195 devices to increase the total programmable delay range.

Does the device have a minimum fixed delay?

Yes, due to the chain of multiplexers, the EP195 has a fixed minimum delay of approximately 2.2 ns, which is added to the programmable delay value.