CY29FCT818ATDMB

Shift Registers Overview

The CY29FCT818ATDMB is a military-grade diagnostic scan register featuring an 8-bit pipeline register and an 8-bit shadow register. It operates within a supply voltage range of 4.5 V to 5.5 V, with a maximum operating temperature of 125°C. The device provides 3-state outputs with a 20-mA sink current and a 3-mA source current. Propagation delay ranges from 6 ns to 12 ns depending on the signal path. It utilizes a 24-lead ceramic dual-in-line (CDIP) package.

Shift Registers Feature Summary

• Includes an 8-bit general-purpose data pipeline register for standard system applications and an auxiliary 8-bit shadow register designed for diagnostic purposes in sequential circuits.
• Supports partial-power-down mode operation through Ioff circuitry that disables outputs to prevent damaging current backflow when the device is powered down.
• Features edge-rate control circuitry to significantly improve noise characteristics and ensure matched rise and fall times.

Shift Registers Applications

• Diagnostics in sequential circuits where loading known data at specific locations and reading it back is required
• Partial-power-down applications requiring output disablement during power-off states
• High-speed 8-bit general-purpose data paths

Shift Registers Procurement Notes

Verify the part number suffix against the manufacturer's official documentation to confirm the specific package type, temperature rating, and electrical specifications. Ensure compatibility with MIL-PRF-38535 requirements if military-grade performance is necessary. Confirm lead finish and moisture sensitivity levels prior to procurement.

Shift Registers Selection Notes

Select this component when a high-speed 8-bit register with dedicated diagnostic capabilities is required. The CY29FCT818ATDMB is suitable for environments demanding extended temperature ranges up to 125°C. Consider the lower drive strength compared to commercial variants when designing output loads.

Shift Registers Part Context

This component belongs to the FCT logic family, which offers reduced VOH versions of equivalent functions. It is functionally compatible with FCT, F Logic, and AM29818 standards. The device integrates ESD protection exceeding JESD 22 specifications for human-body, machine model, and charged-device models.

Shift Registers Replacement Considerations

CY29FCT818CTSOCT

Shift Registers FAQ

How does the shadow register support diagnostics?

The shadow register can load data from the device output or act as a right-shift register using serial input and output pins. This allows known values to be loaded into the data path and read back via the auxiliary loop for comparison against expected values.

What is the purpose of the Ioff circuitry?

The Ioff circuitry supports partial-power-down mode by disabling the outputs. This prevents damaging current backflow through the device when it is powered down but other parts of the system remain active.