74ALVCH162836VRE4

Overview

The SN74ALVCH162836VRE4 is a 20-bit universal bus driver with 3-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 1.65 V to 3.6 V and supports data rates up to 150 MHz. The device utilizes an EPIC submicron CMOS process and features active bus-hold circuitry on data inputs, eliminating the need for external pullup or pulldown resistors. It includes equivalent 26-ohm series resistors in the output port to reduce overshoot and undershoot without requiring external components. Designed for compliance with JEDEC SDRAM buffered DIMM specifications, it offers ESD protection exceeding 2000 V per MIL-STD-883. The component is characterized for operation from -40°C to 85°C and is available in a 56-pin Thin Very Small-Outline (DGV) package.

Feature Summary

• Integrated active bus-hold circuitry maintains valid logic levels on unused or floating data inputs, removing the requirement for external pullup or pulldown resistors.
• Output port incorporates equivalent 26-ohm series resistors designed to minimize signal overshoot and undershoot, negating the need for additional external resistance.
• ESD protection capabilities exceed 2000 V according to MIL-STD-883 Method 3015 and surpass 200 V using the machine model specification.
• Latch-up performance exceeds 250 mA per JESD 17 standards, ensuring robust operation under various electrical stress conditions.

Applications

• Buffered DIMMs compliant with JEDEC 168-pin and 200-pin SDRAM specifications
• High-speed data buffering in systems requiring 1.65-V to 3.6-V operation
• Universal bus driving applications utilizing transparent or latched modes

Procurement Notes

Verify the specific ordering suffix 'VRE4' corresponds to the TVSOP DGV package variant when sourcing. Confirm RoHS compliance status and Moisture Sensitivity Level (MSL) ratings align with assembly requirements. Ensure design reviews account for the recommended operating conditions regarding input transition rates and control input states to guarantee proper functionality.

Selection Notes

Select this component for designs requiring 20-bit wide data paths with independent output enable and latch control. The inclusion of internal series resistors simplifies PCB layout by reducing component count. Consider the 56-pin TVSOP footprint constraints and thermal impedance characteristics during the mechanical design phase to ensure adequate heat dissipation.

Part Context

This device belongs to the Texas Instruments Widebus family, engineered for high-density data transfer applications. It represents an evolution in universal bus drivers by combining significant bit-width capacity with low-voltage compatibility. The integration of bus-hold features and internal termination enhances signal integrity in complex digital systems.

Replacement Considerations

SN74ALVCH162836VR

FAQ

How does the device handle floating data inputs?

Active bus-hold circuitry is provided on the data inputs to hold unused or floating inputs at a valid logic level, thereby eliminating the need for external pullup or pulldown resistors.

What is the function of the LE and CLK inputs?

When the latch-enable (LE) input is low, the device operates in transparent mode. When LE is high, data is stored in the latch/flip-flop on the low-to-high transition of the clock (CLK) input.

Does the device require external resistors for output termination?

No, the output port includes equivalent 26-ohm series resistors to reduce overshoot and undershoot, so no external resistors are required.