SN74ALVCH162836DL

Overview

The SN74ALVCH162836DL is a 20-bit universal bus driver with 3-state outputs from the Texas Instruments Widebus family. It operates on a 1.65-V to 3.6-V VCC supply and utilizes an EPIC submicron process. The device features active bus-hold circuitry on data inputs, eliminating external pullup/pulldown resistors. Output ports include equivalent 26-Ω series resistors to reduce overshoot and undershoot. Designed for SDRAM buffered DIMM applications, it provides ESD protection exceeding 2000 V per MIL-STD-883. Propagation delays range from 4.4 ns to 5.8 ns depending on voltage.

Feature Summary

• Integrated 26-Ω output series resistors eliminate the need for external components to manage signal integrity.
• Active bus-hold circuitry maintains valid logic levels on unused or floating data inputs without external pullup or pulldown resistors.
• ESD protection exceeds 2000 V per MIL-STD-883 Method 3015 and 200 V using the machine model.
• Latch-up performance exceeds 250 mA per JESD 17 standards.

Applications

• Buffered DIMMs compliant with JEDEC 168-Pin specifications
• Buffered DIMMs compliant with JEDEC 200-Pin specifications
• High-density memory systems requiring widebus data transfer

Procurement Notes

Verify the DL package designation corresponds to the Plastic Shrink Small-Outline package when sourcing. Confirm RoHS compliance status as older production runs may differ. Ensure operating temperature requirements align with the -40 °C to 85 °C range specified in the datasheet. Cross-reference the manufacturer part number against current availability lists to confirm production status.

Selection Notes

Select this component for designs requiring 20-bit data path buffering with integrated termination. The Widebus architecture supports high-speed transfers up to 150 MHz. Consider the 26-Ω internal resistance for impedance matching needs. Verify that the 1.65-V to 3.6-V supply range matches the system voltage rails. Evaluate the SSOP-56 footprint constraints against the PCB layout capabilities.

Part Context

This device belongs to the Texas Instruments ALVCH logic family, designed for low-voltage CMOS applications. It is part of the broader Widebus product line intended for high-density digital interfaces. The SN74ALVCH162836 serves as a bridge between microprocessors and memory arrays, providing necessary buffering and timing control for complex digital systems.

Replacement Considerations

SN74ALVCH162836GR (TSSOP package)

FAQ

How does the device handle floating data inputs?

The SN74ALVCH162836 includes active bus-hold circuitry on all data inputs. This feature holds unused or floating inputs at a valid logic level, removing the requirement for external pullup or pulldown resistors.

What is the purpose of the internal series resistors?

The output ports contain equivalent 26-Ω series resistors. These are integrated to reduce signal overshoot and undershoot, thereby improving signal integrity without requiring external discrete resistors.