Texas Instruments 74ALVC164245DGGTE4

Overview

74ALVC164245DGGTE4 from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver with independent 2.5-V/3.3-V (VCCA) and 3.3-V/5-V (VCCB) supply rails, enabling bidirectional level shifting between voltage domains. It delivers ±24-mA output drive at 3.3 V, achieves 5.8-ns max propagation delay, and supports asynchronous data transfer in mixed-voltage systems such as industrial I/O modules interfacing 3.3-V microcontrollers with 5-V peripherals.

For engineers reviewing the 74ALVC164245DGGTE4 datasheet, 74ALVC164245DGGTE4 pinout, 74ALVC164245DGGTE4 application, or 74ALVC164245DGGTE4 equivalent, key selection criteria include dual-rail voltage translation capability (2.5↔3.3 V and 3.3↔5 V), 48-pin TSSOP package compatibility, 3-state output control via separate DIR/OE pins per octet, and latch-up immunity exceeding 250 mA per JESD17.

Technical Context

The device implements two independent 8-bit transceiver sections (1A/1B and 2A/2B), each with dedicated direction-control (1DIR/2DIR) and output-enable (1OE/2OE) inputs referenced to VCCA. Control logic operates solely from VCCA, while A-port I/Os are referenced to VCCA and B-port I/Os to VCCB-enabling true bidirectional translation without external biasing.

Input circuits remain active regardless of OE state, requiring all unused A/B port pins to be held at valid logic levels to prevent excess ICC and ICCZ. Power-up sequencing mandates tying OE to VCCA via pullup resistor to guarantee high-impedance state during ramp-up, avoiding bus contention in multi-rail systems.

Key Specifications

Pinout & Package

74ALVC164245DGGTE4 uses a 48-pin TSSOP (DGG) package measuring 12.50 mm × 6.10 mm, with exposed thermal pad not electrically connected. Pin numbering follows standard JEDEC outline MS-012AC, with dual ground planes and split power rails for noise isolation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional level-shifting transceiver applications.

Compared with SN74LVC164245DGGR and TXB0108PWR, the 74ALVC164245DGGTE4 uniquely supports 2.5-V A-side operation with full 24-mA drive and deterministic DIR-controlled timing-making it the only option for high-speed, mixed-voltage industrial control where precise direction management and voltage margin are critical.

Availability

74ALVC164245DGGTE4 is available at Aetrix Electronics and suitable for industrial I/O modules, embedded controller interfaces, printed circuit test equipment, and motor drive control boards requiring stable component supply and guaranteed long-term availability.

Supply support for 74ALVC164245DGGTE4 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 ALVC family was designed specifically for high-speed, low-voltage bidirectional bus interfacing in mixed-supply systems-emphasizing minimal propagation delay, robust ESD performance, and seamless voltage-domain bridging without external components.

FAQ

What voltage ranges does the 74ALVC164245DGGTE4 support for level shifting?

The 74ALVC164245DGGTE4 supports bidirectional translation between 2.5-V and 3.3-V domains (VCCA = 2.3–3.6 V, VCCB = 3–3.6 V) and between 3.3-V and 5-V domains (VCCA = 2.7–3.6 V, VCCB = 4.5–5.5 V). Its dual-rail architecture allows independent configuration of A-port and B-port supply voltages, enabling flexible system integration without external level-shifting circuitry. This makes the 74ALVC164245DGGTE4 ideal for upgrading legacy 5-V subsystems while retaining modern 2.5-V/3.3-V controllers.

How does the 74ALVC164245DGGTE4 handle power-up sequencing to avoid bus contention?

The 74ALVC164245DGGTE4 requires OE inputs to be tied to VCCA via a pullup resistor to ensure high-impedance outputs during power-up. This prevents unintended data leakage or contention when VCCA ramps before VCCB. The minimum resistor value depends on the driver's current-sinking capability, typically 10 kΩ for standard CMOS drivers. TI recommends powering VCCA before VCCB and ramping DIR with VCCA if A→B data flow is required at startup-ensuring the 74ALVC164245DGGTE4 remains safely isolated until both supplies stabilize.

Can unused I/O pins on the 74ALVC164245DGGTE4 be left floating?

No, unused I/O pins on the 74ALVC164245DGGTE4 must be actively driven to a valid logic HIGH or LOW level. Input circuits remain active regardless of OE state, and floating pins cause undefined internal states, increased ICC and ICCZ currents, and potential oscillation. TI's application report SCBA004 specifies that all unused inputs should be terminated to VCCA or GND using appropriate series resistors or direct connections-this requirement applies equally to A-port, B-port, DIR, and OE pins to ensure reliable operation of the 74ALVC164245DGGTE4 in production systems.

What is the maximum data rate supported by the 74ALVC164245DGGTE4?

The 74ALVC164245DGGTE4 supports data rates up to 100 MHz based on its 5.8-ns maximum propagation delay (tpd) at VCCA = 3.3 V and VCCB = 5 V. This timing specification assumes proper layout practices-including controlled-impedance routing, minimized trace lengths, and adequate decoupling-and accounts for worst-case process/voltage/temperature conditions. For sustained high-speed operation, designers must limit load capacitance to ≤50 pF per line and maintain clean power delivery to both VCCA and VCCB rails to preserve signal integrity in the 74ALVC164245DGGTE4.

Does the 74ALVC164245DGGTE4 require external pullup/pulldown resistors on DIR or OE pins?

Yes-the 74ALVC164245DGGTE4 requires a pullup resistor on each OE pin to VCCA to guarantee high-impedance outputs during power-up or reset conditions. DIR pins may be driven directly from logic sources but must never float; if unused, they should be tied to VCCA (for A→B default) or GND (for B→A default) with appropriate series resistance. TI specifies that OE must be actively controlled to prevent metastability, and the 74ALVC164245DGGTE4's control inputs are not internally biased-making external termination essential for deterministic behavior in all operating modes.