DS1124U-25+

Delay Lines IC Overview

The DS1124U-25+ is an 8-bit programmable timing element housed in a 10-pin µSOP package. It provides 256 delay intervals with a nominal step size of 0.25ns, achieving total delays from 20ns to 84ns. The device operates on a single 5.0V supply (4.75V to 5.25V) and features a 3-wire serial interface for programming. Key electrical parameters include a maximum serial clock frequency of 10MHz, active current up to 30mA, and output drive capabilities of -1mA high-level and 8mA low-level. It supports input frequencies up to 10MHz with minimum pulse widths of 40ns.

Delay Lines IC Feature Summary

• Adjustable delay resolution via 8-bit digital control
• Supports signal phase adjustment exceeding one full period
• Compatible with standard CMOS and TTL logic levels
• Enables cascading multiple units through a shared serial bus

Delay Lines IC Applications

• LCD television synchronization circuits
• Telecommunications signal processing
• Digital test equipment timing adjustments
• Digital video projection systems
• Signal generators and analyzers

Delay Lines IC Procurement Notes

Verify the specific suffix designation when ordering. The absence of a trailing character indicates cut tape packaging, while the 'T' suffix denotes tape and reel configuration. Confirm that the component meets lead-free and RoHS compliance standards required by the target assembly process. Ensure the operating temperature range aligns with the system environment specifications.

Delay Lines IC Selection Notes

Select this component when precise sub-nanosecond delay adjustments are necessary within a 5V logic environment. The 3-wire interface minimizes microcontroller pin usage compared to parallel alternatives. Consider the integral nonlinearity specifications if strict linearity across all 256 steps is critical for the application timing requirements.

Delay Lines IC Part Context

This part belongs to the DS1124 series of programmable delay lines manufactured by Analog Devices / Maxim Integrated. It serves as a functional alternative to the DS1021-25 model. The device integrates an 8-bit latch and shift register architecture to manage the delay settings efficiently without requiring external memory components.

Delay Lines IC Replacement Considerations

The DS1021-25 is documented as a similar functional device. Verify pin compatibility and electrical characteristics before substitution. No other direct substitute part numbers are confirmed in the provided documentation.

Delay Lines IC FAQ

How is the programmed delay value read back from the device?

The Q pin outputs the current register value during serial clocking. To prevent destructive reads, the data from Q must be written back to the D input using a feedback resistor or separate I/O pins.

What is the settling time required after updating the delay setting?

A settling time (tEDV) of 50µs is required after pulling the Enable (E) pin low before the signal delay meets its specified accuracy.

Can multiple DS1124 devices be used on a single bus?

Yes, multiple devices can be cascaded on the same 3-wire bus. Software must shift bits for all connected devices during each read or write cycle to maintain correct settings.