74HSTL162822DGGRE4

Latches Overview

The SN74HSTL162822DGGRE4 is a 14-bit to 28-bit D-type latch designed for 3.15-V to 3.45-V VCC operation. It accepts HSTL levels on inputs and drives LVTTL levels on outputs. The device features two independent 14-bit latch groups, each controlled by its own latch-enable (LE) input. All outputs include equivalent 25-ohm series resistors and sink up to 12 mA. Propagation delay from D to Q ranges from 1.6 ns to 5 ns, while LE to Q ranges from 1.7 ns to 5.7 ns at VCC = 3.3 V ± 0.15 V. It operates from -40°C to 90°C in a 64-pin TSSOP package.

Latches Feature Summary

• Converts HSTL input signals to LVTTL output levels for memory interface compatibility
• Integrates 25-ohm series resistors on all outputs to minimize signal overshoot and undershoot
• Provides dual independent 14-bit latching with separate enable control for address bus distribution

Latches Applications

• Driving memory address buses to two banks of memory
• HSTL-to-LVTTL level translation in high-speed digital systems
• Widebus family address latch applications

Latches Procurement Notes

Verify the specific ordering suffix against current Texas Instruments documentation to confirm package type, lead finish, and moisture sensitivity level. Confirm RoHS compliance status and environmental classification as specifications may be updated. Ensure the component meets JEDEC standards for the intended operating voltage range.

Latches Selection Notes

Select this component when interfacing HSTL-compliant sources with LVTTL-compatible memory devices. The integrated series resistors simplify PCB layout by reducing external component count. Verify that the supply voltage remains within the 3.15-V to 3.45-V range to ensure proper logic threshold operation.

Latches Part Context

This part belongs to the Texas Instruments Widebus family, specifically designed for high-density memory interfaces. It addresses the need for reliable address latching between different logic families in system architectures requiring strict timing and signal integrity management.

Latches Replacement Considerations

Check for SN74HSTL162822DGGR or SN74HSTL162822DGGRE4G4 as direct pin-compatible alternatives within the same manufacturer's portfolio.

Latches FAQ

What is the function of the VREF pin?

The VREF pin sets the reference voltage for HSTL input thresholds, typically operating between 0.68 V and 0.9 V.

How are the outputs configured regarding impedance?

All outputs are designed with equivalent 25-ohm series resistors to reduce signal reflections and improve waveform quality.