Texas Instruments SN74ALS29833NT

Overview

SN74ALS29833NT from Texas Instruments is an 8-bit bidirectional bus transceiver with integrated 9-bit odd-parity generator/checker, open-collector ERR flag, and error-flag register clocked on CLK rising edge; operates at 4.75–5.25 V, supports 0°C to 70°C industrial temperature range, and features inverted-parity diagnostic mode for system-level fault injection. It enables parity-aware data routing between A and B buses in legacy computing and industrial backplane systems.

For engineers reviewing the SN74ALS29833NT datasheet, SN74ALS29833NT pinout, SN74ALS29833NT application, or SN74ALS29833NT equivalent, key selection considerations include its dual-directional parity-aware bus isolation, open-collector ERR output timing (tPHL/tPLH ≤13 ns), register-controlled error flag latching, and NT-package DIP-24 mechanical compatibility with through-hole legacy designs.

Technical Context

The SN74ALS29833NT implements a synchronous parity-check architecture where PARITY is generated from A1–A8 inputs plus internal logic, while ERR reflects real-time parity validation of B1–B8 plus PARITY input sampled at CLK↑. The error-flag register is edge-triggered and asynchronously cleared by CLR low pulse.

Its functional modes are fully defined by OEA/OEB/CLR/CLK combinations: A→B transfer with parity generation (OEA=L, OEB=H), B→A transfer with parity checking (OEA=H, OEB=L), bus isolation (OEA=OEB=H), and forced inverted-parity diagnostics (OEA=OEB=L). All I/Os use ALS bipolar technology with guaranteed 24 mA sink and 24 mA source drive capability.

Key Specifications

Pinout & Package

SN74ALS29833NT uses a 300-mil plastic DIP (Dual In-line Package) with 24 leads, pin-compatible with industry-standard DIP-24 footprints and socketable for prototyping and repair. Pin spacing is 0.1 inch (2.54 mm), body width 0.3 inches (7.62 mm).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit parity transceiver applications.

Compared with AM29833PC and SN74AS29833N, the SN74ALS29833NT offers optimal balance of speed, power, and thermal stability for cost-sensitive industrial retrofits, while retaining full functional equivalence and DIP-24 mechanical compatibility.

Availability

SN74ALS29833NT is available at Aetrix Electronics and suitable for legacy computer backplane upgrades, industrial PLC I/O module refurbishment, and military avionics data link maintenance requiring stable component supply and long-term obsolescence mitigation.

Supply support for SN74ALS29833NT 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 founded in 1930, specializing in analog, logic, and embedded processing technologies with broad industrial and aerospace heritage.

The SN74ALS29833NT belongs to TI's 74ALS advanced low-power Schottky logic family, designed specifically for high-reliability, medium-speed bus interfacing in systems requiring deterministic parity checking and backward compatibility with TTL infrastructure.

FAQ

What is the primary function of the SN74ALS29833NT in a data bus system?

The SN74ALS29833NT serves as an 8-bit bidirectional bus transceiver with integrated odd-parity generation and checking. During A→B data transfer, it computes and appends a parity bit; during B→A transfer, it validates incoming data plus parity bit and asserts ERR if mismatched. Its register-latched ERR output enables synchronized error reporting in clocked systems, making SN74ALS29833NT essential for hardware-level data integrity in legacy computing and industrial control architectures.

How does the inverted-parity mode work on the SN74ALS29833NT?

The SN74ALS29833NT enters inverted-parity diagnostic mode when both OEA and OEB are driven low. In this state, the device generates a deliberate parity error on A→B transfers-regardless of input data-by forcing PARITY to violate odd-parity rules. This feature allows system designers to validate error-handling firmware, test ERR signal routing, and perform end-to-end diagnostic coverage without external fault injection, directly leveraging SN74ALS29833NT's internal logic.

What are the voltage and timing requirements for reliable CLK and CLR operation on the SN74ALS29833NT?

The SN74ALS29833NT requires CLK and CLR inputs to meet ALS-family thresholds: VIH ≥2.0 V and VIL ≤0.8 V, with minimum pulse widths of 10 ns for CLK high/low and CLR low. CLK rising edge must satisfy tsu = 17 ns (relative to Bi/PARITY) and th = 0 ns. CLR low pulse must be ≥10 ns to guarantee asynchronous reset of the error-flag register. These values ensure robust sampling and clearing behavior across the full 0°C–70°C operating range of the SN74ALS29833NT.

Can the SN74ALS29833NT be used in new designs today?

The SN74ALS29833NT is marked OBSOLETE by Texas Instruments and not recommended for new designs. However, Aetrix Electronics maintains verified legacy inventory and provides full traceability, lifecycle coordination, and technical support for ongoing production, repair, and obsolescence mitigation programs. Engineers selecting SN74ALS29833NT should do so explicitly for sustaining engineering, spares provisioning, or certified legacy system upgrades-not greenfield development.

What package type and mechanical dimensions does the SN74ALS29833NT use?

The SN74ALS29833NT uses a 300-mil plastic DIP (dual in-line package) with 24 leads, designated NT package per TI's packaging nomenclature. It has 0.1-inch lead pitch, 0.3-inch body width, and standard DIP-24 footprint (0.600 × 0.300 inches). This through-hole package supports socket-based prototyping, manual rework, and compatibility with legacy PCB assemblies designed for 74-series logic ICs, distinguishing SN74ALS29833NT from surface-mount variants like SN74ALS29833DW.