Texas Instruments SN74ABT833DW

Overview

SN74ABT833 from Texas Instruments is an 8-bit to 9-bit parity bus transceiver with integrated parity generator/checker, open-collector ERR flag output, and register-stored error detection. It operates at 4.5–5.5 V, supports bidirectional A↔B data transfer, and delivers high-drive outputs (–32 mA IOH, 64 mA IOL) for robust bus interfacing in industrial backplane systems.

For engineers reviewing the SN74ABT833 datasheet, SN74ABT833 pinout, SN74ABT833 application, or SN74ABT833 equivalent, this device is selected for synchronous parity-checked data routing between isolated 8-bit buses where error-flag latching, inverted-parity diagnostics, and 24-pin SOIC thermal performance (θJA = 81°C/W) are critical design requirements.

Technical Context

The SN74ABT833 implements a BiCMOS EPIC-II^B architecture enabling low-power operation while maintaining TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and fast propagation delays (tPLH/tPHL ≤ 5.4 ns). Its dual output-enable controls (OEA/OEB) allow independent bus isolation, and the CLK-synchronized ERR register captures parity errors on rising edges.

Parity generation is odd-type and includes the PARITY signal itself in summation logic; inverted-parity mode (OEA = OEB = L) forces a deliberate error for system-level diagnostic validation. The ERR output is open-collector, requiring external pull-up, and the CLR input asynchronously resets the error flag register.

Key Specifications

Pinout & Package

SN74ABT833 is housed in a 24-pin plastic small-outline integrated circuit (SOIC) package (DW), with 1.27 mm pitch, 7.5 mm body width, and RoHS-compliant NiPdAu lead finish. Moisture sensitivity level is Level-1 (unlimited reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT833, SN74ABT823DW removes parity functionality entirely but retains identical drive strength and timing, while SN74LVTH16233DGGR scales bus width and voltage range at the cost of integrated error flag retention and diagnostic flexibility.

Availability

SN74ABT833 is available at Aetrix Electronics and suitable for industrial backplane routing, memory subsystem parity validation, and diagnostic test equipment requiring stable component supply and long-term obsolescence management.

Supply support for SN74ABT833 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 with emphasis on reliability, longevity, and industrial-grade qualification.

The ABT logic family-including SN74ABT833-is designed for high-speed, high-drive 5-V bus interface applications demanding robust noise immunity, latch-up resistance, and extended temperature operation.

FAQ

What is the function of the CLR input on the SN74ABT833?

The CLR (Clear) input on the SN74ABT833 is an asynchronous active-low signal that resets the internal error flag register, forcing the ERR output high regardless of current parity status. This allows immediate error-state clearance without waiting for a clock edge, supporting deterministic system reset sequences and diagnostic recovery workflows in the SN74ABT833.

How does inverted-parity mode work in the SN74ABT833?

Inverted-parity mode activates when both OEA and OEB are low, causing the SN74ABT833 to generate incorrect (even) parity for A→B transfers - a deliberate error condition. This feature enables hardware-level fault injection for validating error-handling firmware and system diagnostics without modifying data patterns, directly leveraging the SN74ABT833's built-in logic.

Is the ERR output of the SN74ABT833 push-pull or open-collector?

The ERR output of the SN74ABT833 is open-collector, requiring an external pull-up resistor to VCC. This configuration allows wired-OR connection of multiple ERR signals onto a shared system interrupt line, enabling centralized parity error monitoring across several SN74ABT833 devices in large backplane architectures.

What is the maximum clock frequency supported by the SN74ABT833 for ERR flag registration?

The SN74ABT833 does not specify a maximum clock frequency; instead, it defines minimum pulse widths: CLK high/low time ≥ 3 ns and CLR low pulse ≥ 3 ns. With tPHL/tPLH ≤ 5.4 ns and setup/hold times as low as 2 ns, the SN74ABT833 reliably registers ERR flags at clock rates up to ~100 MHz in typical 5-V industrial designs.

Does the SN74ABT833 support hot insertion or live bus swapping?

The SN74ABT833 includes power-up/power-down high-impedance protection guidance: OE inputs should be tied to VCC via pull-up resistors to ensure isolation during supply ramping. While not formally hot-swap rated, this design practice-combined with its >2000 V HBM ESD rating-enables robust field-replaceable module operation when implemented per TI's recommended biasing in the SN74ABT833 datasheet.