SN74HSTL16919DGGR

Latches Overview

The SN74HSTL16919DGGR is a 9-bit to 18-bit D-type latch designed for 3.15-V to 3.45-V VCC operation, belonging to the Widebus family. It accepts HSTL levels on inputs and provides LVTTL Level III outputs. The device features two independent latch-enable (LE) inputs controlling nine data channels each. It includes 10-kΩ pullup resistors on all D and LE inputs to ensure low ICC during power transitions. The component operates within a temperature range of 0°C to 70°C and utilizes a 48-TSSOP package.

Latches Feature Summary

• Accepts HSTL input levels while providing LVTTL output levels
• Includes integrated 10-kΩ pullup resistors on data and latch-enable inputs
• Features dual latch-enable inputs for independent control of address banks
• Provides ESD protection exceeding JESD 22 specifications

Latches Applications

• Driving memory address buses to two separate banks
• Memory address latching in computer systems
• High-speed digital logic interfacing

Latches Procurement Notes

Verify the specific ordering suffix DGGR confirms the TSSOP-48 tape and reel packaging configuration. Confirm that the operating temperature range meets the 0°C to 70°C requirement for the target application environment. Ensure VREF is applied prior to or simultaneously with VCC to maintain proper differential voltage relative to the reference pin.

Latches Selection Notes

Select this component when an interface between HSTL sources and LVTTL loads is required for memory addressing. The dual LE structure allows simultaneous control of two distinct nine-bit address banks. Verify that the system design accommodates the necessary VREF generation and that the 10-kΩ internal pullups satisfy the power-up state requirements without external components.

Latches Part Context

This part belongs to Texas Instruments' Widebus family of high-speed logic devices. It is specifically engineered for memory applications requiring translation between HSTL and LVTTL standards. The SN74HSTL16919DGGR variant specifies the standard commercial temperature grade and surface-mount packaging format.

Latches Replacement Considerations

SN74HSTL16919DGGRE4

Latches FAQ

How are unused inputs handled?

Unused inputs must maintain a minimum differential voltage of 100 mV between the data inputs and VREF to ensure proper device operation.

What is the timing behavior during a race condition?

The data race condition time (tldr) is 0 ns, representing the maximum time after LE switches low that data can return to the latched state without producing a glitch.