Texas Instruments SN74ALB16245DGGR

Overview

SN74ALB16245DGGR from Texas Instruments is a 3.3-V, 16-bit ALB (Advanced Low-Voltage BiCMOS) transceiver with 3-state outputs, designed for high-speed bidirectional data bus isolation in memory and peripheral interfaces. It supports dual 8-bit or single 16-bit operation, features 1.3 ns typical propagation delay at 3.3 V, ±25 mA output drive, and operates across –40°C to 85°C. Used in backplane and motherboard data path buffering where low-noise, fast switching and bus contention prevention are critical.

For engineers reviewing the SN74ALB16245DGGR datasheet, SN74ALB16245DGGR pinout, SN74ALB16245DGGR application, or SN74ALB16245DGGR equivalent, key selection considerations include its TSSOP-48 package thermal resistance (58°C/W), industry-standard '16245 pinout compatibility, flow-through architecture for PCB layout optimization, and Schottky-clamped inputs for overshoot/undershoot suppression.

Technical Context

The SN74ALB16245DGGR implements two independent 8-bit transceiver sections, each controlled by dedicated DIR (direction) and OE (output enable) inputs. Direction control determines A→B or B→A data flow, while OE asserts high-impedance on both A and B ports when active high.

Its ALB process combines bipolar speed with CMOS low power, enabling 0.6 ns minimum propagation delay and sub-2 ns enable/disable timing. Distributed V_CC/GND pins and Schottky diodes on all I/Os suppress simultaneous switching noise and transient voltage excursions-critical for 3.3-V mixed-signal system integrity.

Key Specifications

Pinout & Package

TSSOP-48 (DGG) package: 12.6 mm × 6.2 mm × 1.2 mm max height, lead pitch 0.5 mm, RoHS-compliant matte tin lead finish, MSL Level 1 (unlimited floor life).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16245ADGGR and SN74AVC16245DGGR, the SN74ALB16245DGGR delivers superior noise immunity via integrated Schottky clamps and lower propagation delay, making it optimal for high-reliability industrial backplanes-but requires strict adherence to 3.3-V-only supply and lacks dual-voltage flexibility.

Availability

SN74ALB16245DGGR is available at Aetrix Electronics and suitable for memory subsystem buffering, peripheral interface isolation, backplane data routing, and test equipment signal conditioning requiring stable component supply and long-term industrial availability.

Supply support for SN74ALB16245DGGR 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 high-performance logic and interface solutions.

The SN74ALB16245DGGR belongs to TI's Widebus™ family-designed specifically for high-speed, low-voltage bus interface applications in computing, communications, and industrial control systems where timing precision and signal integrity are paramount.

FAQ

What is the maximum operating frequency supported by the SN74ALB16245DGGR?

The SN74ALB16245DGGR does not specify a maximum clock frequency but achieves 1.3 ns typical propagation delay at 3.3 V with 50-pF load. In practice, it reliably supports data rates exceeding 500 Mbps in point-to-point configurations with controlled impedance and short trace lengths. System-level timing must account for board parasitics and driver/receiver characteristics-not just the SN74ALB16245DGGR's intrinsic delay.

Does the SN74ALB16245DGGR support hot-swap or live-insertion?

The SN74ALB16245DGGR is not rated for hot-swap operation. Its absolute maximum ratings permit VI up to V_CC + 0.5 V and clamp current up to ±50 mA, but it lacks built-in bus-hold, power-up/down sequencing control, or I_off protection. For live-insertion, external series resistors and TVS devices are required-and the SN74ALB16245DGGR must be powered before signal application to avoid latch-up.

Can the SN74ALB16245DGGR be used with 5-V logic systems?

No-the SN74ALB16245DGGR is strictly a 3.3-V device with V_CC range of 3.0 V to 3.6 V. Applying 5 V exceeds its absolute maximum supply rating (4.6 V) and will cause permanent damage. Interfacing with 5-V systems requires level-shifting circuitry; the SN74ALB16245DGGR itself must operate only within its specified 3.3-V domain.

What is the function of the distributed V_CC and GND pins on the SN74ALB16245DGGR?

The SN74ALB16245DGGR places eight V_CC and eight GND pins across the TSSOP-48 package to minimize high-frequency switching noise. This reduces power supply inductance per I/O group, lowers ground bounce amplitude, and improves noise margin during simultaneous 16-bit transitions-directly enabling stable operation at sub-2 ns timing without external decoupling beyond standard 0.1-µF ceramics per V_CC-GND pair.

Is the SN74ALB16245DGGR pin-compatible with other '16245-family devices?

Yes-the SN74ALB16245DGGR uses the industry-standard '16245 pinout, matching SN74LVC16245A, SN74LVTH16245A, and SN74ABT16245A in TSSOP-48 (DGG) package. Pin functions, numbering, and physical layout are identical, enabling mechanical and layout compatibility-but electrical behavior (drive strength, timing, noise suppression) differs significantly due to ALB process advantages.