74ALVCH16501DGGRG4

Overview

The SN74ALVCH16501DGGRG4 is an 18-bit universal bus transceiver from the Texas Instruments Widebus family, housed in a 56-pin TSSOP package. 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 features 3-state outputs with ±24-mA drive capability at 3.3 V. Propagation delay (tpd) ranges from 1 ns to 6.3 ns depending on the control path and voltage. It includes active bus-hold circuitry on data inputs to eliminate external pullup/pulldown resistors.

Feature Summary

• Combines D-type latches and flip-flops for transparent, latched, or clocked operation
• Active bus-hold circuitry maintains valid logic states on unused inputs
• ESD protection exceeds JESD 22 specifications for human-body and machine models

Applications

• High-density memory buffer applications
• Clock drivers and buffered oscillators
• Multiplexer / demultiplexer circuits

Procurement Notes

Verify the ordering suffix 'G4' indicates compliance with RoHS standards and absence of lead and antimony oxides. Confirm the package designation 'DGG' corresponds to the 56-lead Thin Shrink Small Outline Package. Ensure the operating temperature range matches the -40°C to +85°C specification required for the target application environment.

Selection Notes

Select this component when an 18-bit bidirectional interface requires flexible data flow control via separate latch-enable and clock inputs. The ALVCH series is suitable for low-voltage systems requiring high-speed performance. Verify that the system's output load does not exceed the ±24-mA drive limit at the specific operating voltage.

Part Context

This part belongs to the Texas Instruments SN74ALVCH16501 family of universal bus transceivers. It is functionally equivalent to the SN74ALVCH16501DGGR but includes the G4 suffix to denote specific environmental compliance attributes. The device integrates both latching and non-latching paths within a single 18-bit architecture.

Replacement Considerations

Direct pin-compatible alternatives include the SN74ALVCH16501DL and SN74ALVCH16501KR. Cross-manufacturer equivalents such as the Nexperia 74ALVCH16501DGGY may be considered if electrical parameters align with the design requirements.

FAQ

How is the data flow direction controlled?

Data flow is managed by independent output-enable (OEAB/OEBA), latch-enable (LEAB/LEBA), and clock (CLKAB/CLKBA) inputs, allowing A-to-B or B-to-A transfer in transparent, latched, or clocked modes.

What is the purpose of the bus-hold feature?

Bus-hold circuitry holds unused or undriven inputs at a valid logic state, removing the need for external pullup or pulldown resistors.