Texas Instruments PCA9548ADGVR

Overview

PCA9548ADGVR from Texas Instruments is an 8-channel bidirectional I²C bus switch with voltage-level translation, active-low reset, and hardware address selection (A0–A2). It operates from 2.3 V to 5.5 V, supports up to 400 kHz clock frequency, and enables resolution of I²C slave address conflicts in multi-sensor server and telecom systems.

For engineers reviewing the PCA9548ADGVR datasheet, PCA9548ADGVR pinout, PCA9548ADGVR application, or PCA9548ADGVR equivalent, key selection criteria include channel count, reset functionality, I²C timing compliance (Standard/Fast Mode), voltage translation capability across 1.8 V/2.5 V/3.3 V/5 V domains, and package-specific thermal performance in the TVSOP-24 footprint.

Technical Context

The PCA9548ADGVR implements eight independent bidirectional pass-gate switches controlled via a single 8-bit I²C register, where each bit enables one SCn/SDn channel. Its internal state machine resets on power-up or active-low RESET assertion, deselecting all channels and reinitializing I²C communication logic.

It supports voltage translation by isolating upstream (master) and downstream (slave) I²C buses-each pair (SCn/SDn) can operate at different supply voltages (e.g., 3.3 V master ↔ 5 V slave) using separate external pull-ups, while all I/O pins remain 5-V tolerant and R_ON stays ≤10 Ω at 5 V.

Key Specifications

Pinout & Package

PCA9548ADGVR uses the TVSOP-24 (DGV) package: 5.00 mm × 4.40 mm body, 0.65 mm pitch, exposed thermal pad optional. Pin 1 = A0; Pin 24 = VCC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar I²C switch applications.

Compared with PCA9548ADGVR, TCA9548APWR extends thermal capability without altering I²C behavior, while PCA9546ADGVR trades channel density for smaller footprint and lower unit cost - both retain identical control register structure and voltage translation features.

Availability

PCA9548ADGVR is available at Aetrix Electronics and suitable for server backplane management, telecom router I²C expansion, and factory automation sensor hub applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for PCA9548ADGVR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The PCA9548ADGVR belongs to TI's I²C switch and multiplexer product line, engineered specifically to resolve slave address collisions and enable mixed-voltage I²C system architectures in space- and power-constrained embedded platforms.

FAQ

What is the maximum I²C clock frequency supported by the PCA9548ADGVR?

The PCA9548ADGVR supports I²C clock frequencies up to 400 kHz, fully compliant with Fast Mode specifications. It also operates reliably at Standard Mode (100 kHz). Timing parameters including t_SCL, t_SCH, and t_BUF are guaranteed across the full 2.3 V–5.5 V supply range and –40°C to +85°C temperature range, as verified in the official TI datasheet SCPS143G.

Does the PCA9548ADGVR require external pull-up resistors on all I²C lines?

Yes, the PCA9548ADGVR requires external pull-up resistors on SCL, SDA, and all eight SCn/SDn channel pairs. Pull-up values depend on bus capacitance and target speed - TI recommends 1 kΩ to 10 kΩ depending on load. The device itself contains no internal pull-ups; all I/O pins are open-drain compatible and 5-V tolerant.

Can the PCA9548ADGVR translate between 1.8 V and 5 V I²C buses?

Yes, the PCA9548ADGVR enables voltage-level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V I²C domains. This is achieved by powering each SCn/SDn channel pair from its respective slave supply voltage while using separate external pull-up resistors tied to those local supplies. The VCC pin sets the maximum pass-through voltage, and all I/O pins tolerate up to 5 V regardless of VCC level.

How does the RESET pin function on the PCA9548ADGVR?

The RESET pin on the PCA9548ADGVR is active-low and asynchronously resets the internal I²C state machine and channel selection register, deselecting all eight channels. A pulse width ≥6 ns is required. The pin must be pulled high via an external resistor when not asserted. RESET recovery time (t_REC) is 0 ns, enabling immediate reconfiguration after deassertion.

What package type is used for the PCA9548ADGVR part number?

The PCA9548ADGVR uses the TVSOP-24 (DGV) package: 5.00 mm × 4.40 mm body size, 0.65 mm lead pitch, 24-pin surface-mount outline. This package offers improved thermal performance over SSOP and reduced footprint versus SOIC, making it ideal for dense server and networking PCB layouts where airflow and space are constrained.