Texas Instruments 74ACT16833DL

Overview

74ACT16833DL from Texas Instruments is a dual 8-bit-to-9-bit noninverting parity bus transceiver IC designed for bidirectional data bus communication with real-time odd-parity generation and checking. It operates at 4.5 V to 5.5 V, supports −40°C to 85°C industrial temperature range, features open-collector error flag outputs (1ERR/2ERR), and delivers tPLH/tPHL propagation delays as low as 3.2 ns. It is used in high-reliability backplane and motherboard interconnects requiring parity-based data integrity verification.

For engineers reviewing the 74ACT16833DL datasheet, 74ACT16833DL pinout, 74ACT16833DL application, or 74ACT16833DL equivalent, key selection criteria include its dual-parity-channel architecture, TTL-compatible inputs, flow-through pinout for PCB layout optimization, and support for inverted-parity diagnostic mode via OEA/OEB control.

Technical Context

The 74ACT16833DL integrates two independent parity transceivers, each with dedicated clock (1CLK/2CLK), clear (1CLR/2CLR), output-enable (1OEA/1OEB, 2OEA/2OEB), parity I/O (1PARITY/2PARITY), and open-collector error flag (1ERR/2ERR) terminals. Each channel performs A→B odd-parity generation or B→A parity checking with error latching on CLK rising edge.

Its EPIC™ 1-µm CMOS process enables 500-mA latch-up immunity at 125°C, distributed VCC/GND pins suppress switching noise, and flow-through architecture aligns A/B bus signals to minimize trace skew. The device supports inverted-parity mode (OEA=OEB=low) for forced-error diagnostics without external logic.

Key Specifications

Pinout & Package

74ACT16833DL is housed in a 56-pin shrink small-outline (DL) package with 300-mil body width and 25-mil center-to-center pin spacing, optimized for high I/O density in space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar parity bus transceiver applications.

Compared with 74ACT16833DL, 74ACT16835DL reduces channel granularity and removes clocked error capture, while SN74LVC16833DGGR shifts to 3.3-V operation and sacrifices industrial robustness-making 74ACT16833DL uniquely suited for legacy 5-V, high-noise, dual-diagnostic bus architectures.

Availability

74ACT16833DL is available at Aetrix Electronics and suitable for industrial PLC backplanes, redundant server memory interconnects, and automated test equipment bus interfaces requiring stable component supply and long-term obsolescence management.

Supply support for 74ACT16833DL 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The 74ACT16833DL belongs to TI's Widebus™ family of high-speed bus interface ICs, engineered specifically for noise-immune, high-density parallel data transfer in mission-critical computing and control systems.

FAQ

What is the operating voltage range for the 74ACT16833DL?

The 74ACT16833DL operates from 4.5 V to 5.5 V. This range ensures reliable compatibility with standard 5-V TTL and CMOS logic families while maintaining noise margin and output drive capability. Operation outside this range may cause functional failure or permanent damage, as specified in the absolute maximum ratings.

How does the 74ACT16833DL handle parity checking during B-to-A data transfer?

During B-to-A transfer, the 74ACT16833DL configures 1PARITY or 2PARITY as an input and combines it with the B-input data bits to compute odd parity. If the result fails odd-parity validation, the error flag (1ERR or 2ERR) is latched on the low-to-high transition of the corresponding CLK input. The flag remains asserted until cleared by the CLR input.

Can the 74ACT16833DL be used in inverted-parity diagnostic mode, and how is it enabled?

Yes, the 74ACT16833DL supports inverted-parity diagnostic mode. It is enabled by driving both OEA and OEB low simultaneously. In this mode, the device generates a forced parity error during A-to-B transfer, providing a hardware-level method to verify downstream error detection circuitry without modifying data patterns.

What is the significance of the flow-through architecture in the 74ACT16833DL package layout?

Flow-through architecture in the 74ACT16833DL positions A-bus and B-bus signals on opposite sides of the DL package, allowing straight-line PCB routing between connectors. This minimizes trace length, reduces crosstalk and skew, and simplifies high-speed layout-especially critical in backplane and motherboard applications where signal integrity directly impacts system reliability.

Does the 74ACT16833DL support hot-swap or live-insertion applications?

The 74ACT16833DL includes I/O protection features such as ±20 mA input clamp current and distributed power pins that help mitigate transient stress, but it lacks explicit hot-swap control circuitry (e.g., slew-rate limiting or undervoltage lockout). For live-insertion, external protection (e.g., series resistors, TVS diodes) and careful power sequencing are required-designs must validate against actual insertion waveforms per application.