Texas Instruments SN74LVTH162245DGGR

Overview

SN74LVTH162245 from Texas Instruments is a 3.3-V ABT 16-bit dual-octal noninverting bus transceiver with 3-state outputs, designed for mixed-mode signal operation between 3.3-V and 5-V systems. It supports bidirectional data flow (A↔B), features bus-hold on all data inputs, integrated 22-Ω series output resistors on A-port pins, and operates down to 2.7 V for unregulated battery applications.

For engineers reviewing the SN74LVTH162245 datasheet, SN74LVTH162245 pinout, SN74LVTH162245 application, or SN74LVTH162245 equivalent, key selection considerations include its hot-insertion support via Ioff and power-up 3-state, TTL-compatible 5-V input tolerance at 3.3-V VCC, low ground bounce (<0.8 V), and flow-through pinout optimized for PCB layout in high-speed digital backplanes and memory interfaces.

Technical Context

The SN74LVTH162245 implements two independent 8-bit transceiver sections, each controlled by dedicated DIR and OE inputs. Its ABT (Advanced BiCMOS Technology) architecture enables 3.3-V core operation while accepting 5-V logic levels on both A and B ports - critical for interfacing legacy 5-V peripherals with modern low-voltage processors.

Each A-port output integrates a 22-Ω series resistor to suppress overshoot/undershoot without external components; bus-hold circuitry eliminates need for pullup/pulldown resistors on unused inputs. The device enters high-impedance state during power-up/down when VCC is below 1.5 V, and supports hot insertion via Ioff protection that blocks reverse current when powered down.

Key Specifications

Pinout & Package

TSSOP-48 package (DGG), 12.6 mm × 6.1 mm × 1.2 mm max height, lead pitch 0.5 mm, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16245ADGGR and SN74AVC16T245DGGR, the SN74LVTH162245 uniquely delivers 5-V input tolerance at 3.3-V VCC with integrated termination and bus-hold - making it the only option among the three for robust, component-minimized interfacing of legacy 5-V devices to modern low-voltage controllers.

Availability

SN74LVTH162245DGGR is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory subsystem bridges, hot-swappable module interfaces, and low-power battery-powered systems requiring stable component supply and long-term production continuity.

Supply support for SN74LVTH162245DGGR 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, with over 90 years of innovation in high-reliability logic, interface, and power management ICs.

The SN74LVTH162245 belongs to TI's Widebus™ family of advanced bus interface devices, engineered specifically for high-speed, mixed-voltage digital system interconnects in industrial, telecom, and computing infrastructure.

FAQ

What voltage levels can the SN74LVTH162245 accept on its B-port inputs?

The SN74LVTH162245 accepts input voltages up to 5.5 V on all B-port pins while operating at VCC = 2.7–3.6 V. This 5-V tolerance enables direct connection to legacy TTL and CMOS peripherals without external level-shifting circuitry, preserving signal integrity and reducing component count in mixed-voltage systems.

Does the SN74LVTH162245 require external pullup or pulldown resistors on unused inputs?

No. The SN74LVTH162245 includes active bus-hold circuitry on all data inputs, which maintains a valid logic state on floating or undriven pins. Using external pullup or pulldown resistors with the SN74LVTH162245 is explicitly discouraged in the datasheet, as it may interfere with bus-hold functionality and increase power consumption.

How does the SN74LVTH162245 support hot insertion in powered backplanes?

The SN74LVTH162245 supports hot insertion through two key features: Ioff circuitry disables outputs when VCC = 0, blocking reverse current flow; and power-up 3-state forces outputs into high-impedance mode during power ramp-up or ramp-down (VCC < 1.5 V). Together, these prevent bus contention and driver damage during live card insertion into a powered system.

What is the purpose of the 22-Ω series resistors on the A-port outputs of the SN74LVTH162245?

The 22-Ω series resistors integrated into each A-port output of the SN74LVTH162245 dampen signal edge rates and suppress transmission-line reflections on PCB traces. This eliminates the need for discrete series termination resistors, reduces BOM cost and layout complexity, and improves signal fidelity in high-speed bus applications such as memory interfaces and FPGA interconnects.

Can the SN74LVTH162245 operate reliably at VCC = 2.7 V?

Yes. The SN74LVTH162245 is fully specified from VCC = 2.7 V to 3.6 V. At 2.7 V, it maintains guaranteed VOL ≤ 0.55 V (at 64 mA sink), VOH ≥ 2.4 V (at 24 mA source), and tPHL ≤ 3.9 ns - enabling robust operation in battery-powered systems where supply voltage sags under load, without requiring voltage regulation.