Texas Instruments SN74ABT16853DLR

Overview

SN74ABT16853DLR from Texas Instruments is a dual 8-bit-to-9-bit parity bus transceiver with integrated parity generator/checker, latch-enabled error flag (ERR), and high-drive outputs (–32 mA IOH, 64 mA IOL) for bidirectional data bus communication in industrial control backplanes. It operates at 4.5 V to 5.5 V over –40°C to 85°C and supports true data transfer with flow-through architecture.

For engineers reviewing the SN74ABT16853DLR datasheet, SN74ABT16853DLR pinout, SN74ABT16853DLR application, or SN74ABT16853DLR equivalent, key selection criteria include parity-error flag latching behavior, inverted-parity diagnostic mode, distributed VCC/GND pinning for noise reduction, and compatibility with 5-V TTL-level systems requiring bus isolation and error detection.

Technical Context

The SN74ABT16853DLR implements two independent 8-bit transceivers, each with dedicated A→B and B→A data paths, a 9-bit parity generator/checker, and an open-collector ERR output. Its EPIC-II^B BiCMOS design enables low ground bounce (<1 V VOLP) and latch-up immunity >500 mA per JEDEC JESD-17.

Control logic includes dual output-enable (OEA/OEB), latch-enable (LE), and clear (CLR) inputs that govern data direction, parity generation vs. checking, ERR sampling/storage/clearing, and high-impedance isolation. The device supports inverted-parity mode (when both OEA and OEB are low) for system diagnostics.

Key Specifications

Pinout & Package

SN74ABT16853DLR uses a 56-pin plastic shrink small-outline (DL) package with 300-mil body width and 0.025-inch pin pitch. Distributed VCC and GND pins minimize switching noise; flow-through pin arrangement simplifies PCB routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT162245DLR and SN74LVTH16835DGGR, the SN74ABT16853DLR uniquely integrates hardware parity generation, checking, and latched error reporting in a 5-V industrial-grade transceiver - eliminating external logic and reducing BOM count for safety-critical bus monitoring.

Availability

SN74ABT16853DLR is available at Aetrix Electronics and suitable for industrial backplane data transfer, telecom line card interfacing, automated test equipment bus monitoring, and avionics data concentrator interface applications requiring stable component supply and long-term obsolescence management.

Supply support for SN74ABT16853DLR 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 decades of industrial and aerospace qualification experience.

The SN74ABT16853DLR belongs to TI's Widebus™ family of high-speed bus interface devices, engineered specifically for robust, noise-immune data transfer in mission-critical industrial and communications infrastructure.

FAQ

What is the operating voltage range for the SN74ABT16853DLR?

The SN74ABT16853DLR operates from 4.5 V to 5.5 V, ensuring compatibility with standard 5-V TTL and CMOS logic families. This range accommodates typical industrial power supply tolerances and maintains specified timing and drive performance across the full temperature range of –40°C to +85°C. The SN74ABT16853DLR is not rated for 3.3-V operation.

How does the SN74ABT16853DLR handle parity error detection and reporting?

The SN74ABT16853DLR generates odd parity during A→B transfers and checks parity during B→A transfers, asserting the open-collector ERR output low on mismatch. The ERR flag can be sampled, stored in an internal latch via LE, or cleared asynchronously using CLR. This enables flexible error handling - from immediate interrupt generation to deferred status polling - without external storage elements.

Can the SN74ABT16853DLR be used in hot-swap or power sequencing sensitive systems?

Yes - the SN74ABT16853DLR features built-in power-up/down protection: tying OE inputs to VCC via a pullup resistor ensures high-impedance outputs during power transitions. This prevents bus contention and back-driving in systems with staggered supply ramp rates. The SN74ABT16853DLR also exhibits low ICC in disabled states (≤2 mA), minimizing standby current impact.

What is the purpose of inverted-parity mode in the SN74ABT16853DLR?

Inverted-parity mode (activated when both OEA and OEB are low) forces the SN74ABT16853DLR to generate incorrect parity during A→B transfer, guaranteeing ERR assertion. This provides a hardware-based, repeatable fault condition for system diagnostics, burn-in testing, and validation of error-handling firmware - without requiring external stimulus or software intervention.

Does the SN74ABT16853DLR support mixed-voltage interfacing between 3.3-V and 5-V domains?

No - the SN74ABT16853DLR is a 5-V-only device with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and 5-V output swing. While it can accept 3.3-V logic-high inputs (exceeding VIH), its outputs swing to 5 V and may damage 3.3-V receivers. For mixed-voltage systems, level-shifting buffers or 3.3-V alternatives like SN74LVTH16835 must be used instead of the SN74ABT16853DLR.