Texas Instruments SN74LVC16T245DLR

Overview

SN74LVC16T245 from Texas Instruments is a 16-bit dual-supply noninverting bus transceiver with configurable level-shifting between 1.65 V and 5.5 V rails, tri-state outputs, and VCC isolation. It enables bidirectional data translation between mismatched voltage domains (e.g., 1.8 V ↔ 3.3 V) in high-speed digital interfaces, supporting up to 200 MHz operation under 3.3 V → 5 V conditions.

For engineers reviewing the SN74LVC16T245 datasheet, SN74LVC16T245 pinout, SN74LVC16T245 application, or SN74LVC16T245 equivalent, key selection criteria include dual-rail supply flexibility (VCCA/VCCB = 1.65–5.5 V), Ioff partial-power-down support, VCC isolation behavior, and guaranteed 16-channel bidirectional translation with independent DIR/OE control per 8-bit bank.

Technical Context

The SN74LVC16T245 implements two independent 8-bit transceiver banks (1A/1B and 2A/2B), each controlled by dedicated DIR and OE inputs referenced to VCCA. Direction logic is asynchronous: DIR = HIGH enables A→B flow; DIR = LOW enables B→A flow; OE = HIGH forces both ports into high-impedance state regardless of DIR.

VCC isolation ensures that if either VCCA or VCCB drops to GND, all outputs enter high-impedance mode-preventing bus contention during power sequencing. Input circuits remain active at all times, requiring all I/O pins to be held at valid logic levels to avoid excessive ICCZ.

Key Specifications

Pinout & Package

SN74LVC16T245 DLR is a 48-pin TSSOP package (12.50 mm × 6.10 mm) with exposed thermal pad. Pin numbering follows standard TSSOP top-view convention (Pin 1 = 1DIR, Pin 48 = 1OE).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH16T245 and TXB0108PWR, the SN74LVC16T245 provides optimal balance of voltage flexibility (1.65–5.5 V), proven VCC isolation, and industry-standard 16-bit channel count - making it the preferred choice for industrial and telecom backplane applications requiring deterministic direction control and robust power sequencing behavior.

Availability

SN74LVC16T245 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive ADAS sensor hubs, enterprise SSD controllers, and telecom baseband processing requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SN74LVC16T245 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 delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.

The SN74LVC16T245 belongs to TI's LVC logic family, engineered specifically for low-voltage bidirectional bus translation in mixed-signal systems where voltage domain interoperability, power sequencing resilience, and signal integrity are critical design constraints.

FAQ

What voltage ranges does the SN74LVC16T245 support on its A and B ports?

The SN74LVC16T245 supports independent supply voltages from 1.65 V to 5.5 V on both VCCA (A-port rail) and VCCB (B-port rail). This allows reliable bidirectional translation between common logic families including 1.8 V, 2.5 V, 3.3 V, and 5 V domains without external components. The device guarantees proper operation across the full specified range per rail, as verified in TI's SCES636B datasheet Section 7.3.

How does the VCC isolation feature work in the SN74LVC16T245?

The VCC isolation feature in the SN74LVC16T245 ensures that if either VCCA or VCCB drops to GND, both A and B ports automatically enter high-impedance state - preventing bus contention and false logic levels during asymmetric power-up/down sequences. This behavior is hardware-enforced and requires no external circuitry, as confirmed in Section 9.1 and Table 1 of the official datasheet.

Can the SN74LVC16T245 operate with different supply voltages on VCCA and VCCB simultaneously?

Yes, the SN74LVC16T245 is explicitly designed for simultaneous dual-rail operation with different voltages on VCCA and VCCB - for example, 1.8 V on VCCA and 3.3 V on VCCB. Its fully configurable architecture allows independent voltage tracking per port, enabling seamless level shifting without performance degradation, as validated in switching characteristics Tables 7.6–7.9 of the SCES636B datasheet.

What is the maximum data rate supported by the SN74LVC16T245?

The SN74LVC16T245 supports data rates up to 200 MHz in specific configurations - notably when translating between 3.3 V and 5 V rails. This is derived from its minimum propagation delay of 0.3 ns (tPLH/tPHL) under VCCA = VCCB = 5 V conditions, as documented in Section 7.9 of the SCES636B datasheet. Actual achievable rate depends on load capacitance and signal integrity implementation.

Does the SN74LVC16T245 require external pull-up resistors on its control pins?

TI recommends tying OE to VCCA via a pull-up resistor to ensure reliable high-impedance state during power-up/power-down, especially when VCCA ramps before VCCB. The minimum resistor value depends on the driver's sink capability, but typical values range from 4.7 kΩ to 10 kΩ. DIR pins may be driven directly from CMOS logic without pull-ups, as stated in Section 5 and Figure 4 of the SCES636B datasheet.