Texas Instruments SN74ALVTH16245DLR

Overview

SN74ALVTH16245DLR from Texas Instruments is a 16-bit dual-octal noninverting 3-state transceiver supporting 2.5-V/3.3-V V_CC, mixed-mode 5-V I/O tolerance, ±32/64 mA drive strength, bus-hold inputs, and hot-insertion capability via I_off and power-up 3-state. It enables bidirectional data flow between A and B buses in industrial backplanes and mixed-voltage memory interfaces.

For engineers reviewing the SN74ALVTH16245DLR datasheet, SN74ALVTH16245DLR pinout, SN74ALVTH16245DLR application, or SN74ALVTH16245DLR equivalent, key selection criteria include its 3.3-V-compatible 16-bit bus transceiver function, DL-package thermal resistance (63°C/W), guaranteed hot-swap support, and TTL-level interface to legacy 5-V systems without level shifters.

Technical Context

This device implements two independent 8-bit transceiver sections with shared DIR and OE controls per section. Each section supports direction-controlled bidirectional data transfer (A↔B) under logic-level control, with output isolation during power-up/down via integrated power-up 3-state circuitry.

The ABT BiCMOS process delivers low static power (ICC ≤ 5 mA at 3.3 V), high noise immunity (VIH = 2.0 V min at VCC = 3.3 V), and robust ESD protection (latch-up >100 mA per JESD78 Class II). Bus-hold circuitry eliminates external pull resistors by actively maintaining valid logic states on floating inputs.

Key Specifications

Pinout & Package

SN74ALVTH16245DLR uses a 48-pin SSOP (DL) package with gull-wing leads, 0.5-mm pitch, and JEDEC MO-153 compliance. Dimensions: 11.4 mm × 7.9 mm × 2.4 mm (max height).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit bus transceiver applications.

Compared with SN74LVC16245ADGGR and SN74AVC16245DGGR, SN74ALVTH16245DLR uniquely combines 5-V I/O tolerance, bus-hold, and hot-insertion support-making it the only option among the three for mixed-voltage industrial backplanes requiring field-replaceable modules.

Availability

SN74ALVTH16245DLR is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory subsystem bridging, telecom line card isolation, and automotive diagnostic gateways requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74ALVTH16245DLR 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 logic solutions, with over 50 years of innovation in high-reliability interface and power management ICs.

The SN74ALVTH16245DLR belongs to TI's Widebus™ family of advanced bus interface devices, engineered specifically for robust mixed-voltage communication in mission-critical industrial, telecom, and automotive infrastructure.

FAQ

What voltage levels does SN74ALVTH16245DLR support on its I/O pins?

SN74ALVTH16245DLR accepts input voltages from 0 V to 5.5 V and drives outputs compatible with 5-V TTL logic, while operating from a 2.3–3.6-V V_CC supply. This allows direct connection to 5-V peripherals without external level shifters. The device maintains VIH ≥ 2.0 V and VIL ≤ 0.8 V at V_CC = 3.3 V, ensuring reliable noise margins in mixed-voltage systems. SN74ALVTH16245DLR's I/O structure is explicitly rated for 5-V tolerance per the SCES066G datasheet absolute maximum ratings.

Does SN74ALVTH16245DLR support hot insertion, and how is it implemented?

Yes, SN74ALVTH16245DLR supports hot insertion via two integrated features: I_off circuitry disables outputs when V_CC = 0 V (limiting current to ±100 µA), and power-up 3-state holds outputs in high-impedance during power ramp-up. These functions prevent damaging current backflow and bus contention when inserting into a live backplane. SN74ALVTH16245DLR meets this requirement without external components, as confirmed in the functional description and absolute maximum ratings sections of the official datasheet.

How does the bus-hold feature work on SN74ALVTH16245DLR, and what design benefit does it provide?

The bus-hold circuitry on SN74ALVTH16245DLR actively maintains valid logic states on unused or floating data inputs using internal feedback transistors, sinking 75 µA at VIL and sourcing −75 µA at VIH (V_CC = 3 V). This eliminates the need for external pullup/pulldown resistors, reducing BOM cost and PCB area. SN74ALVTH16245DLR's bus-hold is enabled by default and requires no configuration-critical for preventing undefined states during power-up or signal glitches in high-pin-count bus systems.

What is the maximum data rate supported by SN74ALVTH16245DLR in a typical application?

SN74ALVTH16245DLR achieves propagation delays ≤ 3.1 ns (t_PHL/t_PLH) at CL = 50 pF and V_CC = 3.3 V, supporting reliable operation in systems with clock rates up to 100+ MHz. Its output skew (t_OST) is ≤ 248 ps, ensuring tight timing alignment across all 16 bits. SN74ALVTH16245DLR's performance is validated under recommended operating conditions and load specifications in the switching characteristics tables of SCES066G, making it suitable for high-speed parallel bus applications like memory expansion and FPGA interconnects.

Is SN74ALVTH16245DLR pin-compatible with other members of the '16245 family, such as SN74LVC16245A?

No, SN74ALVTH16245DLR is not pin-compatible with SN74LVC16245A or SN74AVC16245 due to differing pin assignments for control signals and power distribution. While all are 48-pin packages, SN74ALVTH16245DLR places DIR and OE on corners with distributed V_CC/GND, whereas LVC/AVC variants use different terminal mappings. SN74ALVTH16245DLR's pinout is defined in the "Terminal Assignments" section of SCES066G and must be verified against layout before substitution. No documentation confirms pin-to-pin equivalence with alternate '16245 variants.