Texas Instruments SN74ABT16853DGGR

Overview

SN74ABT16853 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 5-V systems. It operates from –40°C to 85°C and features flow-through architecture, distributed VCC/GND pins, and true data output logic.

For engineers reviewing the SN74ABT16853 datasheet, SN74ABT16853 pinout, SN74ABT16853 application, or SN74ABT16853 equivalent, key selection considerations include its dual-bus parity checking capability, ERR flag latching/clearing control (LE/CLR), open-collector ERR output, and compatibility with Widebus™-optimized PCB layouts requiring low ground bounce (<1 V VOLP).

Technical Context

The SN74ABT16853 implements two independent 8-bit transceivers, each with a 9th parity bit path. Parity generation occurs on A→B transfers (odd parity), while parity checking occurs on B→A transfers using the PARITY input alongside B1–B8 - triggering ERR assertion on mismatch. The ERR signal is sampled, stored, or cleared via LE and CLR inputs, enabling diagnostic flag retention across bus cycles.

Its EPIC-II™B BiCMOS process delivers high-speed switching (tPLH/tPHL ≤ 4.2 ns typical) with low power dissipation and latch-up immunity >500 mA per JEDEC JESD-17. Output-enable (OEA/OEB) controls isolate buses, and OE tie-high via pullup ensures defined high-Z state during power sequencing.

Key Specifications

Pinout & Package

SN74ABT16853 is packaged in a 56-pin Thin Shrink Small-Outline (DGG) package with 0.5-mm pitch, optimized for high-density PCB layouts and thermal performance (θJA = 81°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT16853, SN74ABT162245DGGR omits parity entirely - trading diagnostic capability for simplicity - while 74FCT16853CTPAG offers pin-compatible parity functionality at lower speed and drive, making it suitable only where SN74ABT16853's BiCMOS advantages (noise immunity, latch-up rating, VOLP) are not critical.

Availability

SN74ABT16853 is available at Aetrix Electronics and suitable for industrial control systems, avionics data buses, and test equipment requiring stable component supply, long-term lifecycle support, and verified 5-V TTL-compatible bus interface performance.

Supply support for SN74ABT16853 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 connectivity solutions with emphasis on reliability, scalability, and industrial-grade qualification.

The SN74ABT16853 belongs to TI's Widebus™ family of high-speed bus interface ICs, designed specifically for noise-resilient, high-density data routing in mission-critical computing and control infrastructure.

FAQ

What is the function of the LE and CLR pins on the SN74ABT16853?

The LE (Latch Enable) and CLR (Clear) pins control the internal parity-error flag register. LE (active-high) captures the current state of ERR into a latch for persistent fault indication, while CLR (active-low) resets the latch to logic high, clearing any previously stored error condition. This allows the SN74ABT16853 to maintain error status across bus idle periods or system interrupts, supporting robust diagnostics without continuous polling.

Does the SN74ABT16853 support both A→B and B→A parity checking?

The SN74ABT16853 supports full bidirectional parity handling: it generates odd parity on A→B transfers and checks parity on B→A transfers using the PARITY input along with B1–B8. When a mismatch occurs during B→A transfer, the ERR output asserts low. The device does not perform parity checking on A→B transfers - that path only generates parity. This asymmetric function is inherent to the SN74ABT16853 architecture and documented in its function table.

Can the SN74ABT16853 operate at 3.3 V?

No, the SN74ABT16853 is specified only for 4.5 V to 5.5 V supply operation and is not 3.3-V compatible. Its input thresholds (VIH = 2 V min, VIL = 0.8 V max) and output drive characteristics are optimized for 5-V TTL systems. Attempting 3.3-V operation risks undefined logic states, insufficient noise margin, and potential damage due to VI/VCC violation - use TI's 74LVC or ALVC families for 3.3-V parity transceivers.

How is the open-collector ERR output used in a multi-transceiver system?

The open-collector ERR output of the SN74ABT16853 allows multiple devices to share a common fault bus via wired-OR connection with a single pullup resistor. When any SN74ABT16853 detects a parity error, its ERR pin pulls the line low, signaling system-wide fault condition. This eliminates need for external logic gates or multiplexers, simplifying fault aggregation in systems with multiple data paths - a key design advantage confirmed in TI's application guidance for bus integrity monitoring.

What is the purpose of inverted parity mode in the SN74ABT16853?

Inverted parity mode - activated when both OEA and OEB are low - forces even parity instead of odd during A→B transfer, creating a deliberate parity mismatch. This feature enables deterministic fault injection for system validation, burn-in testing, and diagnostic firmware verification. It is a unique capability of the SN74ABT16853 explicitly documented in its function table and not supported by most generic transceivers.