Texas Instruments SN74ALVC164245KR

Overview

SN74ALVC164245 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 mismatched voltage domains. It delivers ±24-mA output drive at 3.3 V, achieves 5.8-ns maximum 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 SN74ALVC164245 datasheet, SN74ALVC164245 pinout, SN74ALVC164245 application, or SN74ALVC164245 equivalent, key selection criteria include verified 2.5-V ↔ 3.3-V and 3.3-V ↔ 5-V translation capability, dual 8-bit directional control (1DIR/2DIR), independent 3-state enable per section (1OE/2OE), and latch-up immunity exceeding 250 mA per JESD17.

Technical Context

The SN74ALVC164245 implements two independent 8-bit transceiver sections, each with dedicated direction (DIR) and output-enable (OE) controls powered by VCCA. Its input circuitry remains active on both A and B ports regardless of OE state, requiring defined logic levels to prevent excess ICC and ICCZ. Control inputs VIH/VIL thresholds are referenced solely to VCCA, decoupling logic-level validation from VCCB voltage.

Each section operates in three functional modes: A→B transmission (DIR = H, OE = L), B→A transmission (DIR = L, OE = L), or high-impedance isolation (OE = H). The device supports down-translation (e.g., 3.3-V A port to 5-V B port) and up-translation (e.g., 5-V B port to 3.3-V A port), with input tolerance up to VCCX + 0.5 V on respective I/O ports.

Key Specifications

Pinout & Package

SN74ALVC164245 is available in TSSOP-48 (12.50 mm × 6.10 mm), SSOP-48 (15.88 mm × 7.49 mm), and BGA MICROSTAR JUNIOR packages (56-ball GQL/ZQL and 54-ball GRD/ZRD). This description applies specifically to the TSSOP-48 variant (DGG package), which is the most widely used orderable option.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC16T245 and TXB0108, the SN74ALVC164245 uniquely supports 5-V B-port operation with 24-mA drive and explicit DIR/OE control-making it the only option among the three qualified for industrial 5-V peripheral interfacing with deterministic timing and robust current delivery.

Availability

SN74ALVC164245 is available at Aetrix Electronics and suitable for industrial motor drives, wireless infrastructure baseband units, printer peripheral interfaces, and wearable health sensor hubs requiring stable component supply across extended product lifecycles.

Supply support for SN74ALVC164245 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 SN74ALVC164245 belongs to TI's Widebus™ family of high-speed logic devices, engineered specifically for reliable voltage-level translation in mixed-supply systems where deterministic timing, robust ESD performance, and latch-up immunity are critical design requirements.

FAQ

What voltage domains does the SN74ALVC164245 support for level shifting?

The SN74ALVC164245 supports bidirectional translation between 2.5-V and 3.3-V domains (VCCA = 2.5 V/3.3 V, VCCB = 3.3 V) and between 3.3-V and 5-V domains (VCCA = 3.3 V, VCCB = 5 V). Its A-port tolerates inputs up to VCCA + 0.5 V and B-port up to VCCB + 0.5 V, enabling safe interfacing with overvoltage sources. The SN74ALVC164245 does not support 1.8-V operation.

How should the output-enable (OE) pins be connected for reliable power-up behavior in the SN74ALVC164245?

For safe power-up and power-down sequencing, each OE pin (1OE and 2OE) must be tied to VCCA through an external pullup resistor. The minimum resistor value depends on the current-sinking capability of the driving source but typically ranges from 4.7 kΩ to 10 kΩ. This ensures the outputs remain in high-impedance state until VCCA is fully stabilized, preventing bus contention. The SN74ALVC164245 control logic is powered exclusively by VCCA.

Can the SN74ALVC164245 operate with VCCA = 2.5 V and VCCB = 5 V simultaneously?

Yes, the SN74ALVC164245 is explicitly characterized for VCCA = 2.5 V ± 0.2 V and VCCB = 5 V ± 0.5 V operation, with switching characteristics including 5.8-ns maximum tpd and guaranteed VOH/VOL levels. Electrical specifications confirm valid operation across this combination, making the SN74ALVC164245 suitable for translating from low-voltage sensors or FPGAs to 5-V industrial actuators without intermediate buffers.

What is the maximum continuous output current rating per pin for the SN74ALVC164245?

The SN74ALVC164245 supports ±24 mA per output pin at VCCA = 3 V and VCCB = 5 V, with absolute maximum ratings specifying ±50 mA continuous output current per pin. Total device current is limited to ±100 mA across all VCC and GND pins. These values are validated per JEDEC JESD78 and confirmed in the "Recommended Operating Conditions" and "Electrical Characteristics" tables of the official SN74ALVC164245 datasheet.

Does the SN74ALVC164245 require external termination resistors for signal integrity?

The SN74ALVC164245 does not require external series termination resistors for basic functionality, but controlled impedance routing and point-to-point topology are recommended for traces exceeding 10 cm or operating above 25 MHz. Its 5.8-ns tpd and ±24-mA drive can cause ringing on unterminated lines; adding 22–33 Ω series resistors near drivers improves edge monotonicity. The SN74ALVC164245 datasheet provides layout guidelines in Section 11 to minimize crosstalk and ground bounce.