Texas Instruments SN74ABT16833DL

Overview

SN74ABT16833DL from Texas Instruments is a dual 8-bit-to-9-bit parity bus transceiver in a 56-pin SSOP (DL) package, operating at 4.5–5.5 V with –32-mA/64-mA drive strength, integrated parity generation/checking, and open-collector error-flag outputs. It enables bidirectional data transfer between A and B buses while detecting odd-parity errors in real time for high-reliability backplane and memory subsystem applications.

For engineers reviewing the SN74ABT16833DL datasheet, SN74ABT16833DL pinout, SN74ABT16833DL application, or SN74ABT16833DL equivalent, key selection criteria include its dual-channel parity logic, flow-through architecture for PCB layout optimization, latch-up immunity (>500 mA), distributed V_CC/GND pinning for noise reduction, and support for inverted-parity diagnostic mode.

Technical Context

The SN74ABT16833DL implements two independent 8-bit parity transceivers, each with dedicated clock (CLK), clear (CLR), output-enable (OEA/OEB), parity I/O (PARITY), and error-flag (ERR) terminals. Parity generation occurs on A→B transfers; PARITY becomes input during B→A transfers to enable error detection via XOR summation of B-bus inputs and incoming parity bit.

Error flag latching uses edge-triggered behavior: 1ERR/2ERR samples the internal parity-check result on the low-to-high CLK transition and holds until cleared by an active-low CLR signal. The ERR outputs are open-collector, requiring external pull-up for active-high assertion, and support system-level fault logging and interrupt signaling.

Key Specifications

Pinout & Package

SN74ABT16833DL uses a 56-pin Shrink Small-Outline Package (SSOP-DL), 300-mil body width, with 0.635-mm lead pitch and exposed thermal pad not present. Pin numbering follows standard DL package top-view orientation with Pin 1 in Q1 quadrant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT16833DL, SN74ABT162244DL omits all parity functionality and diagnostic features, while SN74LVTH16835DL operates in a non-compatible voltage domain - neither offers functional equivalence, making SN74ABT16833DL uniquely suited for 5-V parity-critical backplane and memory interfaces.

Availability

SN74ABT16833DL is available at Aetrix Electronics and suitable for industrial PLC backplanes, memory subsystem interconnects, and test equipment bus monitoring requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SN74ABT16833DL 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 logic solutions, with over 50 years of innovation in high-speed interface and bus technology.

The SN74ABT16833DL belongs to TI's Widebus™ ABT logic family, designed specifically for high-integrity, high-speed data transfer in noise-prone industrial and telecom infrastructure where parity-based error detection is mandatory.

FAQ

What is the maximum clock frequency supported by SN74ABT16833DL for reliable parity checking?

The SN74ABT16833DL does not specify a maximum clock frequency in its datasheet, but timing parameters indicate minimum CLK pulse width of 3 ns and setup/hold times ≤5 ns. Based on propagation delays (1.5–4.5 ns) and noise margins, it supports reliable operation up to approximately 160 MHz in well-designed 5-V systems with controlled impedance routing. Always verify timing closure using worst-case values from the SCBS097D datasheet for SN74ABT16833DL.

How does SN74ABT16833DL handle power-up sequencing to avoid bus contention?

SN74ABT16833DL ensures high-impedance state during power-up by requiring OE inputs (OEA/OEB) to be tied to V_CC via a pull-up resistor - minimum value determined by driver sink capability. This prevents unintended data transfer or bus conflicts before system initialization completes. The device draws <2 mA in disabled state, minimizing inrush current impact on SN74ABT16833DL power rails.

Can SN74ABT16833DL generate even parity instead of odd parity?

No - SN74ABT16833DL is hardwired for odd-parity generation and checking as defined in its logic diagram and function table. During A→B transfer, it outputs an odd-parity bit; during B→A transfer, it asserts ERR when the XOR sum of B-bus inputs and PARITY pin is even. There is no configuration option or pin to invert parity logic in SN74ABT16833DL.

What is the purpose of the inverted-parity mode (OEA=OEB=low) in SN74ABT16833DL?

When both OEA and OEB are low, SN74ABT16833DL forces an active-low ERR output regardless of data - creating a deterministic "inverted parity" condition. This mode serves as a built-in diagnostic feature, allowing system firmware to verify ERR path integrity, pull-up resistor functionality, and interrupt controller response without external stimulus - a critical capability for safety-critical applications using SN74ABT16833DL.

Is SN74ABT16833DL RoHS compliant and what is its moisture sensitivity level?

Yes, SN74ABT16833DL is RoHS compliant (lead-free NiPdAu finish) and rated MSL Level-1 with unlimited floor life at ≤30°C/60% RH. Its SSOP-DL package has been qualified per JEDEC J-STD-020, permitting reflow soldering at peak temperatures up to 260°C without baking - confirmed in TI's official packaging addendum for SN74ABT16833DL.