Texas Instruments 74LVC16T245DGVRG4

Overview

74LVC16T245 from Texas Instruments is a 16-bit dual-supply noninverting bus transceiver with configurable level-shifting, supporting independent VCCA (1.65–5.5 V) and VCCB (1.65–5.5 V) rails, tri-state outputs, and bidirectional data flow between mixed-voltage domains such as 1.8-V/3.3-V interfaces in industrial I/O modules.

For engineers reviewing the 74LVC16T245 datasheet, 74LVC16T245 pinout, 74LVC16T245 application, or 74LVC16T245 equivalent, key selection criteria include VCC isolation behavior, Ioff partial-power-down compliance, propagation delay under 22 ns at 3.3 V, voltage translation direction control via DIR/OE, and TSSOP-48 package compatibility with high-density PCB layouts.

Technical Context

The 74LVC16T245 implements two independent 8-bit transceiver channels (1A↔1B and 2A↔2B), each controlled by dedicated DIR and OE inputs referenced to VCCA. Directional data flow is determined solely by DIR logic level while OE enables/disables output drivers-no internal latching or clocking is involved.

Its dual-rail architecture isolates A-port I/Os (referenced to VCCA) from B-port I/Os (referenced to VCCB), enabling true bidirectional level translation without external biasing. The VCC isolation feature forces both ports into high-impedance when either VCCA or VCCB = GND, and Ioff limits backflow current during partial power-down.

Key Specifications

Pinout & Package

TSSOP-48 package (body size 12.50 mm × 6.10 mm), lead pitch 0.5 mm, exposed pad not present. Pin numbering follows standard TSSOP top-view convention with pin 1 at bottom-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus transceiver applications.

Compared with SN74AVCH16T245 and TXB0108PWR, the 74LVC16T245 uniquely guarantees VCC isolation and supports full 16-bit manual direction control-critical for industrial backplanes and safety-critical medical systems where bus arbitration must be explicit and fail-safe.

Availability

74LVC16T245 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive ADAS sensor hubs, enterprise SSD controllers, and medical imaging acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 74LVC16T245 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74LVC16T245 belongs to TI's LVC logic family designed specifically for robust, low-voltage bidirectional bus interfacing in mixed-supply systems-emphasizing power sequencing resilience, ESD hardness, and guaranteed timing across voltage combinations.

FAQ

What is the minimum recommended pull-up resistor value for OE on the 74LVC16T245?

The minimum pull-up resistor value for OE on the 74LVC16T245 is determined by the current-sinking capability of the driving signal source. TI specifies that OE must be tied to VCCA through a pullup resistor to ensure high-impedance state during power-up/down. For typical 3.3-V GPIO drivers with 4-mA sink capability, a 10-kΩ resistor is sufficient. Always verify against the actual driver's IOL rating per the 74LVC16T245 datasheet Section 7.3.

Can the 74LVC16T245 translate between 1.8-V and 5-V buses in both directions simultaneously?

Yes, the 74LVC16T245 supports simultaneous bidirectional translation between 1.8-V and 5-V buses. Each of its two 8-bit channels operates independently: one channel can route data from 1.8-V A-port to 5-V B-port while the other routes from 5-V B-port to 1.8-V A-port, provided DIR and OE are configured per channel. This capability is confirmed in the device functional modes table (Section 9.4) and supported by VCCA/VCCB independence.

Does the 74LVC16T245 require external biasing or termination resistors for proper level translation?

No, the 74LVC16T245 does not require external biasing resistors for level translation-it uses internal circuitry referenced to VCCA and VCCB to establish valid logic thresholds. Termination resistors are optional and only needed for impedance matching in high-speed (>50 MHz) transmission lines. TI recommends 0.1-µF bypass capacitors on both VCCA and VCCB per the layout guidelines in Section 12.1 of the 74LVC16T245 datasheet.

How does the VCC isolation feature behave if VCCA = 0 V and VCCB = 3.3 V on the 74LVC16T245?

When VCCA = 0 V and VCCB = 3.3 V, the 74LVC16T245 places both A-port and B-port outputs into high-impedance state regardless of DIR or OE states. This VCC isolation behavior is guaranteed per Section 9.3.4 and Electrical Characteristics (IOZ parameter), preventing false logic levels or contention on either bus during asymmetric power-down sequences common in industrial systems.

Is the 74LVC16T245 pin-compatible with the SN74LVC16245A?

No, the 74LVC16T245 is not pin-compatible with the SN74LVC16245A. The 74LVC16T245 uses a dual-supply architecture with separate VCCA and VCCB pins and independent DIR/OE per 8-bit bank, whereas the SN74LVC16245A is single-supply with shared DIR/OE and no voltage translation capability. Pin counts and functions differ significantly-see Table 1 in the 74LVC16T245 datasheet versus SCES172 for SN74LVC16245A.