MC100E446FN

Specialized Overview

The MC100E446FN is a 5V/EnECL integrated 4-bit parallel to serial data converter manufactured by onsemi. It supports NRZ data rates up to 1.3 Gb/s and includes internal divide-by-4 and divide-by-8 clock outputs. The device operates in PECL mode with VCC = 4.2 V to 5.7 V (VEE = 0 V) or NECL mode with VCC = 0 V (VEE = -4.2 V to -5.7 V). It features differential clock and serial inputs, an asynchronous SYNC input for resetting the conversion sequence, and a MODE pin to expand functionality to 8-bit conversion when cascaded. The component is housed in a PLCC-28 package.

Specialized Feature Summary

• Integrated divide-by-4 and divide-by-8 clock generation for flexible timing control
• Asynchronous data synchronization via dedicated SYNC input pin
• Mode select capability to cascade two devices for 8-bit conversion applications
• Internal VBB reference voltage output for single-ended input configurations

Specialized Applications

• High-speed serial data path transmission systems
• Cascaded 8:1 multiplexer architectures using dual E446 devices
• Data management interfaces requiring parallel-to-serial conversion

Specialized Procurement Notes

Verify that the specific ordering suffix matches the required package type and environmental compliance. The FN suffix indicates a standard PLCC-28 package. Confirm whether Pb-free status is required, as indicated by the G suffix in related part numbers. Ensure power supply configurations align with either PECL or NECL operating ranges before procurement.

Specialized Selection Notes

Select this component for applications requiring high-speed parallel-to-serial conversion up to 1.3 Gb/s. Consider the MC100E446FNG variant if lead-free compliance is mandatory. Evaluate thermal resistance requirements, as junction-to-ambient resistance varies significantly based on airflow conditions. Ensure the design accommodates the specific voltage levels for PECL or NECL operation.

Specialized Part Context

This device belongs to the MC10E/100E446 series of EnECL converters. It is designed to work in conjunction with the MC100EP445 device to provide complete high-speed serial data transmission and reception paths. The 100 Series includes temperature compensation features not present in the base 10 Series.

Specialized Replacement Considerations

The MC10E446FN serves as the functional equivalent to the MC100E446FN within the same family. Verify compatibility regarding temperature compensation and specific electrical characteristics if substituting between the 10 and 100 series variants.

Specialized FAQ

How does the MODE pin affect the conversion function?

When the MODE input is LOW or open, the device functions as a 4-bit converter. When driven HIGH, it enables an 8-bit conversion scheme by changing the internal load clock cycle, allowing two devices to be cascaded.

What is the purpose of the VBB pin?

The VBB pin provides an internally generated reference voltage. It is used for single-ended input conditions where the unused differential input is connected to VBB, or to rebias AC coupled inputs.

Can the device operate at 1.3 Gb/s in an 8-bit cascaded configuration?

No. While a single device operates at 1.3 Gb/s, cascading two E446 devices for 8-bit conversion reduces the maximum operational frequency due to propagation delay and setup time constraints.