MAX9425EHJ+

Translators, Level Shifters Overview

The MAX9425EHJ+ is a high-speed, low-skew quad PECL-to-ECL translator designed for data and clock driver applications. It operates from positive and negative supply voltages ranging from +2.375V to +5.5V and -2.375V to -5.5V, with an operating temperature range of -40°C to +85°C. The device features ultra-low 0.24ps RMS random jitter and less than 90ps channel-to-channel skew in asynchronous mode. It includes integrated 50Ω series output termination and open inputs. Key electrical parameters include a maximum propagation delay of 570ps in asynchronous mode, a typical differential output voltage of 635mV, and power supply currents of 16mA (positive) and 172mA (negative).

Translators, Level Shifters Feature Summary

• Translates up to four PECL signals to ECL signals with ultra-low added random jitter.
• Features integrated 50Ω series output termination resistors and internal pulldown current sources.
• Supports both synchronous operation synchronized to an external clock and independent asynchronous channel operation.
• Includes an enable input that forces all outputs to a differential low state when deactivated.

Translators, Level Shifters Applications

• Data and Clock Driver and Buffer
• Central Office Backplane Clock Distribution
• DSLAM Backplane
• Base Station
• ATE

Translators, Level Shifters Procurement Notes

Verify the specific suffix EHJ corresponds to the 32-pin TQFP package with open inputs and 50Ω series outputs. Confirm RoHS compliance status (+T suffix indicates lead-free). Ensure the ordering code matches the exact pinout and termination configuration required by the schematic, as other variants in the family differ significantly in input/output impedance.

Translators, Level Shifters Selection Notes

Select this component when designing systems requiring translation between PECL and ECL logic families with minimal signal degradation. The integrated 50Ω output termination simplifies PCB layout by eliminating the need for external series resistors. Consider the synchronous/asynchronous mode selection via the SEL pins if precise timing alignment across multiple channels is necessary for the application.

Translators, Level Shifters Part Context

This part belongs to the MAX9424–MAX9427 family of quad PECL-to-ECL translators. While functionally similar, members of this family are distinguished by their input and output termination options. The MAX9425 specifically combines open inputs with integrated 50Ω series output termination, differentiating it from the MAX9424 (open/open), MAX9426 (100Ω/open), and MAX9427 (100Ω/50Ω).

Translators, Level Shifters Replacement Considerations

Functionally compatible with SK4426 (MAX9424), SK4430 (MAX9425), SK4436 (MAX9426), and SK4440 (MAX9427). Verify pin compatibility and termination requirements when substituting with other family members or legacy SK parts.

Translators, Level Shifters FAQ

How does the MAX9425 handle output termination?

The MAX9425 features integrated 50Ω series output termination resistors and 8mA internal pulldown current sources, which removes the need for external termination components on the output lines.

What determines whether the channels operate synchronously or asynchronously?

Operation mode is determined by the state of the SEL input. Setting SEL high enables asynchronous mode where channels operate independently, while setting SEL low enables synchronous mode where outputs are clocked simultaneously by the CLK input.