SN74GTL16616DL

Overview

The SN74GTL16616DL is a 17-bit Universal Bus Transceiver (UBT) from the Texas Instruments Widebus family, housed in a 56-pin SSOP package. It translates between LVTTL logic levels and GTL/GTL+ signal levels. The device supports mixed-mode operation with VCC(3.3V) for LVTTL buffers and VCC(5V) for internal/GTL circuitry. It features buffered clock outputs (CLKOUT/CLKIN), OEC circuitry for signal integrity, and bus hold on data inputs. Operating temperatures range from -40°C to +85°C.

Feature Summary

• Combines D-type latches and flip-flops for transparent, latched, clocked, or clock-enabled modes
• Translates bidirectionally between LVTTL and GTL/GTL+ signal levels
• Includes buffered clock outputs for GTL/GTL+ level copying and conversion

Applications

• Interface between cards operating at LVTTL logic levels and backplanes operating at GTL/GTL+ signal levels
• Mixed-mode 3.3 V and 5 V signal operation on A-port and control inputs
• Partial-power-down mode applications using Ioff support

Procurement Notes

Verify the specific ordering suffix 'DL' corresponds to the SSOP-56 package configuration. Confirm that the required supply voltages (3.3 V and 5 V) and termination/reference voltages match the system design requirements for GTL or GTL+ operation. Ensure compatibility with the specified operating temperature range of -40 °C to +85 °C.

Selection Notes

Select this component when interfacing LVTTL devices with GTL/GTL+ backplanes requiring 17-bit width. The UBT architecture allows flexible data transfer modes including transparent and clocked operations. Consider the OEC circuitry benefits for signal integrity and EMI reduction in high-speed designs.

Part Context

Part of the Texas Instruments Widebus family, the SN74GTL16616 provides universal bus transceiver functionality. It is equivalent to the '16601 function but includes additional buffered clock outputs. The device integrates active bus-hold circuitry to eliminate external pullup/pulldown resistors on the A port.

Replacement Considerations

SN74GTL16616DGGR

FAQ

What is the function of the CLKOUT pin?

The CLKOUT pin provides a copy of the CLKAB signal at GTL/GTL+ signal levels.

How does the device handle unused inputs?

Active bus-hold circuitry holds unused or undriven LVTTL inputs at a valid logic state, eliminating the need for external pullup/pulldown resistors.