74LVCH16245ADGGRG4

Overview

The SN74LVCH16245A is a 16-bit (dual-octal) noninverting bus transceiver designed for asynchronous communication between data buses. It operates from a supply voltage range of 1.65 V to 3.6 V and features inputs that accept voltages up to 5.5 V, supporting mixed-mode signal operation in 5-V input/output environments with 3.3-V VCC. The device provides a maximum propagation delay of 4 ns at 3.3 V and includes active bus-hold circuitry on data inputs to maintain valid logic states without external resistors. It supports partial-power-down mode via Ioff circuitry and offers ESD protection exceeding 2000 V per the human-body model.

Feature Summary

• Supports mixed-mode signal operation by accepting 5-V input voltages while operating at lower supply voltages down to 1.65 V
• Active bus-hold circuitry maintains unused or undriven data inputs at a valid logic state, eliminating the need for external pullup or pulldown resistors
• Ioff feature disables outputs during power-down to prevent damaging current backflow through the device
• Provides high electrostatic discharge protection exceeding 2000 V under the human-body model test standard

Applications

• Electronic points of sale
• Test and measurement equipment
• Wearable health and fitness devices
• Tablets

Procurement Notes

Verify the specific package variant against the orderable addendum, as the DGGRG4 designation corresponds to the TSSOP-48 package. Confirm RoHS compliance and lead finish specifications (NIPDAU) match the design requirements. Ensure the operating temperature range of -40°C to +125°C aligns with the environmental conditions of the target application.

Selection Notes

Select this component when interfacing buses with different voltage levels, specifically translating between 5-V tolerant systems and 1.65-V to 3.6-V logic domains. The dual-octal architecture allows configuration as two independent 8-bit transceivers or a single 16-bit unit. Consider the 4-ns propagation delay and drive capabilities for high-speed data paths requiring low skew and balanced output drive.

Part Context

This device belongs to Texas Instruments' Widebus Family, which specializes in wide-bus transceivers for parallel data transmission. The SN74LVCH16245A utilizes CMOS technology to achieve balanced output drive characteristics. It is part of the LVCH series, distinguished by its ability to tolerate 5-V inputs across the entire 1.65-V to 3.6-V supply range, facilitating integration in multi-power system environments.

Replacement Considerations

SN74LVC16245ADGGRG4

FAQ

How does the device handle unused data inputs?

The SN74LVCH16245A incorporates active bus-hold circuitry that holds unused or undriven data inputs at a valid logic state. This internal feature eliminates the requirement for external pullup or pulldown resistors.

What is the function of the Ioff circuitry?

The Ioff circuitry supports partial-power-down mode by disabling the outputs when VCC is 0 V. This prevents damaging current backflow through the device when it is powered down but the system remains energized.

Can this transceiver be used for voltage translation?

Yes, the device allows down voltage translation. Its inputs accept voltages up to 5.5 V regardless of the VCC level, enabling use as translators in mixed 3.3-V and 5-V system environments.