SN74GTL16616DLR

Overview

The SN74GTL16616DLR is a 17-bit Universal Bus Transceiver (UBT) manufactured by Texas Instruments. It translates between LVTTL logic levels and GTL/GTL+ signal levels, supporting mixed-mode operation on the A-port and control inputs with 5-V tolerance. The device integrates D-type latches and flip-flops for transparent, latched, clocked, or clock-enabled data transfer modes. It features buffered clock outputs (CLKOUT) that copy CLKAB at GTL/GTL+ levels, and converts GTL/GTL+ clocks to LVTTL levels (CLKIN). Operating temperatures range from -40°C to 85°C.

Feature Summary

• Combines D-type latches and flip-flops to support transparent, latched, clocked, and clock-enabled data transfer modes.
• Provides signal-level translation between LVTTL logic levels and GTL/GTL+ signal levels.
• Includes OEC circuitry to improve signal integrity and reduce electromagnetic interference.
• Features active bus-hold circuitry on data inputs to maintain valid logic states without external resistors.

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 environments.
• Partial-power-down mode applications utilizing Ioff support.

Procurement Notes

Verify the specific package variant against project requirements, as the DL suffix indicates an SSOP package while other variants like DGGR use TSSOP. Confirm that the design accommodates the required termination voltages (VTT) and reference voltages (VREF) for either GTL or GTL+ standards. Ensure input pins are properly terminated to prevent floating states during power-up sequences.

Selection Notes

Select this component when interfacing LVTTL devices with GTL/GTL+ backplanes requiring high-speed data transfer up to 95 MHz. The UBT architecture allows flexible data handling through latch or flip-flop configurations. Consider the 5-V tolerance of the A-port if interfacing with legacy 5-V systems. Verify that the system can provide the necessary VTT and VREF supplies for the B-port operation.

Part Context

This device belongs to the Texas Instruments Widebus family and functions as a universal bus transceiver. It is electrically equivalent to the '16601 function but includes additional buffered clock outputs. The SN74GTL16616 series is designed for high-performance applications where signal integrity and noise reduction are critical, leveraging reduced output swing and optimized input thresholds.

Replacement Considerations

SN74GTL16616DGGR