74FCT162841CTPACT

Latches Overview

The Texas Instruments 74FCT162841CTPACT is a 56-lead TSSOP 20-bit D-type latch designed for high-speed bus applications. It operates within an industrial temperature range of -40°C to +85°C at VCC = 5V ± 10%. The device features balanced 24 mA output drivers with current limiting resistors, providing typical ground bounce (VOLP) less than 0.6V at 5V and 25°C. Propagation delay from D to Q is 1.5 ns to 5.5 ns with a 50 pF load. It supports partial-power-down mode via Ioff circuitry and includes edge-rate control for improved noise characteristics.

Latches Feature Summary

• Balanced 24 mA output drivers with integrated current limiting resistors reduce system switching noise and minimize undershoot.
• Edge-rate control circuitry significantly improves noise characteristics during signal transitions.
• Ioff circuitry disables outputs to prevent damaging current backflow when the device is powered down.
• Flow-through pinout configuration simplifies board layout for dense bus architectures.

Latches Applications

• High-speed bus interface systems requiring low power consumption
• Driving transmission lines in industrial environments
• Partial-power-down applications in portable or battery-operated equipment

Latches Procurement Notes

Verify the package type matches the design requirements, as this component is available in both TSSOP and SSOP variants. Confirm the suffix indicates the correct speed grade and lead finish. Check the latest datasheet for any updates on environmental compliance or manufacturing status changes. Ensure the ordering code aligns with the specific quantity and reel specifications needed for production.

Latches Selection Notes

Select this part when a 20-bit latch with balanced drive strength is required for noise-sensitive applications. The CY74FCT16841T variant offers higher sink current for heavy loads but lacks the specific balanced driver characteristics of the 162841 series. Consider the TSSOP package for space-constrained designs compared to the wider SSOP option. Verify that the 5V logic levels match the system voltage requirements.

Latches Part Context

This component belongs to the FCT logic family, known for CMOS speed with TTL-compatible inputs. The 162841 series specifically targets applications needing reduced ground bounce compared to standard FCT latches. It serves as a bridge between older bipolar technologies and modern low-voltage CMOS standards, maintaining compatibility with existing 5V bus architectures while offering improved signal integrity.

Latches Replacement Considerations

The CY74FCT16841T is a related device in the same family but features different output drive characteristics. Direct substitution requires verifying if the higher sink current of the 16841T is acceptable or if the balanced drivers of the 162841T are strictly necessary for the application's noise performance.