74ALVCH162836GRE4

Overview

The SN74ALVCH162836 is a 20-bit universal bus driver with 3-state outputs, designed for 1.65-V to 3.6-V VCC operation. It features active bus-hold circuitry on data inputs and an output port with equivalent 26-Ω series resistors to reduce overshoot and undershoot. The device operates in transparent mode when the latch-enable (LE) input is low; otherwise, A data is latched on the low-to-high transition of the clock (CLK). Data flow from A to Y is controlled by the output-enable (OE) input. It is characterized for operation from -40°C to 85°C.

Feature Summary

• Integrated active bus-hold circuitry eliminates the need for external pullup or pulldown resistors on data inputs.
• Output port includes equivalent 26-Ω series resistors to minimize signal overshoot and undershoot without requiring external components.
• Designed to comply with JEDEC 168-pin and 200-pin SDRAM buffered DIMM specifications.

Applications

• Buffering signals for 168-pin and 200-pin SDRAM buffered DIMMs
• High-speed universal bus driving applications
• Data storage and transfer systems

Procurement Notes

Verify the specific package variant required, as the 'GR' suffix denotes the TSSOP (DGG) package. Confirm RoHS compliance status and moisture sensitivity level (MSL 1) during procurement. Ensure ordering documentation matches the exact part number including all suffixes to guarantee correct pinout and electrical characteristics.

Selection Notes

Select this component for designs requiring 20-bit wide data paths with 3-state control. It is suitable for low-voltage logic families operating between 1.65 V and 3.6 V. Consider its integrated series resistance for high-speed signal integrity requirements. Verify that the system's clock frequency does not exceed the maximum specified limits for the chosen supply voltage.

Part Context

This device belongs to Texas Instruments' Widebus family and utilizes the EPIC submicron process technology. It serves as a high-density solution for managing wide data buses in memory systems. The 56-pin TSSOP package provides a compact footprint for surface-mount assembly.

Replacement Considerations

SN74ALVCH162836GRG4

FAQ

How is the data latching mechanism controlled?

Data is stored in the latch/flip-flop on the low-to-high transition of the CLK input when the LE input is high. If LE is low, the device operates in transparent mode.

What is the purpose of the internal series resistors?

The output port includes equivalent 26-Ω series resistors designed to reduce signal overshoot and undershoot, eliminating the need for external resistors.