Texas Instruments SN74ABT16823DLR

Overview

SN74ABT16823DLR from Texas Instruments is an 18-bit bus-interface D-type flip-flop with 3-state outputs, designed for high-speed bidirectional bus buffering in industrial and computing systems. It features dual 9-bit sections, clock-enable and clear control per section, ±32-mA high-drive outputs, and operates from 4.5 V to 5.5 V over –40°C to 85°C.

For engineers reviewing the SN74ABT16823DLR datasheet, SN74ABT16823DLR pinout, SN74ABT16823DLR application, or SN74ABT16823DLR equivalent, this page delivers verified functional architecture, timing behavior under 50-pF load, thermal performance (θ_JA = 74°C/W), and precise SSOP-56 package interface details - all critical for bus-hold integrity, ground-bounce mitigation, and PCB layout optimization.

Technical Context

This device implements two independent 9-bit D-type flip-flop banks, each with dedicated CLK, CLKEN, CLR, and OE controls. Its EPIC-II^B BiCMOS process enables high-speed operation (f_MAX = 150 MHz) while maintaining low power dissipation and robust noise immunity via distributed V_CC/GND pins and flow-through pinout.

The logic supports asynchronous clear (active-low CLR), synchronous data capture on CLK↑ when CLKEN is low, and true 3-state output control via buffered OE. Output enable does not affect internal latch state - allowing data retention or update during high-impedance output mode.

Key Specifications

Pinout & Package

SN74ABT16823DLR uses a 56-pin Shrink Small-Outline Package (SSOP-DL) with 0.65-mm lead pitch and 11.35 mm × 18.67 mm footprint. Pin 1 is located at top-left corner (Q1 quadrant), with gull-wing leads and JEDEC MO-194 compliance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus-interface flip-flop applications.

Compared with SN74ABT16823DLR, SN74ABT16223DLR trades clock-enable flexibility for per-bit output control, while SN74ALVTH16823GR shifts to lower-voltage operation with improved speed but reduced drive - making SN74ABT16823DLR optimal for legacy 5-V industrial bus interfaces requiring robust noise immunity and high-current drive.

Availability

SN74ABT16823DLR is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion subsystems, and legacy ISA bus adapters requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for SN74ABT16823DLR 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 expertise in high-reliability interface ICs for industrial and computing markets.

SN74ABT16823DLR belongs to TI's Widebus™ family of high-speed bus-interface devices, engineered specifically for noise-resilient, high-drive parallel bus applications in demanding industrial and communications infrastructure.

FAQ

What is the maximum clock frequency supported by SN74ABT16823DLR?

The SN74ABT16823DLR supports a maximum clock frequency of 150 MHz under recommended operating conditions (V_CC = 5 V, T_A = 25°C, C_L = 50 pF). This is confirmed by timing characterization in the official datasheet, where f_MAX is specified as 150 MHz for both SN54ABT16823 and SN74ABT16823 variants. The device achieves this using TI's EPIC-II^B BiCMOS process and optimized flow-through architecture.

Does SN74ABT16823DLR support hot-swap or power-sequencing scenarios?

Yes, SN74ABT16823DLR enters a high-impedance state when V_CC is between 0 V and 2.1 V, preventing bus contention during power-up or power-down. For guaranteed Hi-Z above 2.1 V, OE should be tied to V_CC via a pullup resistor. This behavior is explicitly documented in the datasheet's "description (continued)" section and makes SN74ABT16823DLR suitable for hot-pluggable backplane and modular system designs.

How many independent clock domains does SN74ABT16823DLR provide?

SN74ABT16823DLR provides two independent clock domains - one for each 9-bit section (labeled 1CLK/1CLKEN/1CLR/1OE and 2CLK/2CLKEN/2CLR/2OE). Each domain has dedicated clock, clock-enable, clear, and output-enable controls, allowing asynchronous operation, staggered latching, or isolated bus segments - a key feature confirmed in the FUNCTION TABLE and logic diagram of the SN74ABT16823DLR datasheet.

What is the thermal resistance (θ_JA) of the SN74ABT16823DLR package?

The SN74ABT16823DLR in the DL (SSOP) package has a junction-to-ambient thermal resistance (θ_JA) of 74°C/W, as specified in the Absolute Maximum Ratings table of the datasheet. This value is measured per JEDEC Std JESD51 and reflects the thermal performance of the 56-pin shrink small-outline package under standard board-mount conditions - critical for thermal design in high-density industrial PCB layouts.

Can SN74ABT16823DLR drive a 50-pF load while meeting timing specifications?

Yes, all switching characteristics for SN74ABT16823DLR - including t_PLH, t_PHL, t_PZH, and t_PHZ - are characterized at C_L = 50 pF, as stated in the "Switching Characteristics" tables. For example, t_PLH (CLK→Q) is 1.6 ns (min) to 6.8 ns (max) under these conditions. This confirms that SN74ABT16823DLR is fully specified and validated for driving typical PCB trace + connector + receiver loads totaling 50 pF.