HMC856LC5TR

Overview

The HMC856LC5TR is a wideband time delay device with 5-bit digital control, designed for timing compensation and clock skew management. It supports data rates up to 28 Gbps with a propagation delay of 255 ps and a resolution of 3 ps. The device operates from a single −3.3 V supply, consuming 185 mA (610 mW typical). It features differential CML inputs and outputs with 50 Ω internal termination, supporting AC or DC coupling. The output voltage swing is programmable between 500 mV p-p and 1350 mV p-p via the VR pin. It is housed in a 5 mm × 5 mm LCC-32 package.

Feature Summary

• Supports high-speed data transmission up to 28 Gbps with fast rise/fall times of 20 ps/18 ps.
• Provides nearly 100 ps variable delay range with 3 ps resolution for precise timing adjustments.
• Features an integrated output level control pin (VR) for signal optimization and loss compensation.
• Operates on a single negative supply with low power consumption and monotonic delay stability.

Applications

• SONET OC-192 systems
• High speed serial logic circuits
• Clock and data recovery modules
• Broadband test and measurement equipment
• Frequency synthesis and matched timing

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct packaging configuration. Confirm that the component meets RoHS compliance standards as specified in the datasheet. Check for moisture sensitivity level ratings prior to storage and handling to prevent damage during assembly processes.

Selection Notes

Select this component when precise digital time delay adjustment is required for signals up to 28 Gbps. Ensure the system design accommodates the −3.3 V single supply requirement and the 50 Ω CML interface impedance. Consider the programmable output swing feature if signal integrity optimization across varying load conditions is necessary.

Part Context

The HMC856LC5TR belongs to the HMC856 series of broadband time delay devices manufactured by Analog Devices. It shares core specifications with the HMC856LC5 and HMC856LC5TR-R5 variants, differing primarily in reel packaging options. This series is engineered for high-performance timing applications requiring stable operation over temperature variations.

Replacement Considerations

HMC856LC5 and HMC856LC5TR-R5 are functionally equivalent parts within the same family, distinguished only by packaging format. Verify pin compatibility and electrical parameters before substitution.

FAQ

How does the VR pin affect the device performance?

The VR pin allows for programmable output voltage swing ranging from 500 mV p-p to 1350 mV p-p. Adjusting this voltage enables loss compensation or signal level optimization, though it also influences rise/fall times and power dissipation.

What is the input and output interface type?

The HMC856 uses Current Mode Logic (CML) for both inputs and outputs. Inputs are terminated internally with 50 Ω to ground, and outputs are source terminated to 50 Ω, supporting both AC and DC coupling.

What is the maximum data rate supported?

The device supports data rates up to 28 Gbps, making it suitable for high-speed serial logic and SONET OC-192 applications.