Texas Instruments SN74ABT16823DL

Overview

SN74ABT16823DL 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 telecom systems. It features dual 9-bit sections, ±32-mA high-drive outputs, 150-MHz max clock frequency, and operates from 4.5 V to 5.5 V over –40°C to 85°C. It supports flow-through pinout for optimized PCB layout and delivers low ground bounce (<1 V) at 5 V.

For engineers reviewing the SN74ABT16823DL datasheet, SN74ABT16823DL pinout, SN74ABT16823DL application, or SN74ABT16823DL equivalent, key selection criteria include 3-state bus driving capability, high-impedance behavior during power-up/down, distributed VCC/GND for noise reduction, and compatibility with 5-V TTL-level systems requiring robust drive strength and timing integrity.

Technical Context

This device implements two independent 9-bit D-type flip-flop banks, each with dedicated clock-enable (CLKEN), clear (CLR), and output-enable (OE) controls. Its EPIC-II^B BiCMOS architecture enables high-speed switching while minimizing power dissipation and ground bounce.

The flow-through architecture aligns inputs and outputs on opposite sides of the 56-pin SSOP package, reducing trace crossovers. Distributed VCC and GND pins minimize simultaneous switching noise, and the high-impedance state activates automatically when VCC is below 2.1 V-enabling safe hot-insertion and power sequencing.

Key Specifications

Pinout & Package

SN74ABT16823DL uses a 56-pin Shrink Small-Outline Package (SSOP, DL), 300-mil body width, 0.65-mm lead pitch, and 1.2-mm max height. Pin 1 is located at top-left corner with index area marking; package conforms to JEDEC MO-194.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT16823DL, SN74ABT16223DL adds direction control but removes per-section clock gating, while SN74ALVCH16823DL trades 5-V compatibility and power-ramp safety for lower voltage operation and reduced drive - making SN74ABT16823DL uniquely suited for industrial 5-V bus latching with robust sequencing behavior.

Availability

SN74ABT16823DL is available at Aetrix Electronics and suitable for industrial I/O expansion, telecom backplane buffering, and memory interface latching requiring stable component supply and long-term production continuity.

Supply support for SN74ABT16823DL 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 heritage in high-reliability interface and timing products.

SN74ABT16823DL belongs to the Widebus™ family of high-speed bus-interface logic devices, engineered specifically for noise-immune, high-drive 5-V TTL-compatible applications in industrial, telecom, and computing infrastructure.

FAQ

What is the operating voltage range for SN74ABT16823DL?

The SN74ABT16823DL operates from 4.5 V to 5.5 V. This range ensures compatibility with standard 5-V TTL systems while accommodating typical rail tolerances. Operation outside this range may cause functional failure or damage, as absolute maximum ratings specify –0.5 V to 7 V for VCC - but recommended conditions strictly require 4.5–5.5 V for guaranteed timing, drive, and logic behavior. The SN74ABT16823DL must not be used at 3.3 V or other non-5-V rails.

Does SN74ABT16823DL support independent operation of its two 9-bit sections?

Yes, SN74ABT16823DL supports fully independent operation: each 9-bit section has dedicated CLK, CLKEN, CLR, OE, D, and Q signals. This allows one section to latch data while the other holds or outputs, enabling flexible bus partitioning. The function table confirms separate control logic per section, and the pinout shows physically isolated signal groups. SN74ABT16823DL does not require synchronized clocks or shared control lines between sections.

How does SN74ABT16823DL behave during power-up and power-down?

When VCC is between 0 V and 2.1 V, all outputs of SN74ABT16823DL automatically enter a high-impedance state - preventing bus contention during power ramp. This behavior is inherent to the BiCMOS design and requires no external circuitry. Once VCC exceeds 2.1 V, OE must be actively controlled to maintain Hi-Z if needed. The SN74ABT16823DL specification explicitly guarantees this feature across temperature and process corners.

What is the maximum clock frequency supported by SN74ABT16823DL?

SN74ABT16823DL supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C, CL = 50 pF). This value is confirmed in both timing requirements and switching characteristics tables. At extremes of voltage or temperature, the usable frequency may decrease - e.g., at VCC = 4.5 V and TA = 85°C, timing margins tighten but remain functional within datasheet limits. SN74ABT16823DL is not characterized for operation above 150 MHz.

Can SN74ABT16823DL drive unterminated transmission lines directly?

SN74ABT16823DL is not intended for direct unterminated transmission line driving. Its ±32-mA/±64-mA outputs are optimized for stub-loaded parallel buses (e.g., backplanes, motherboard traces), not impedance-matched point-to-point links. Driving 50-Ω or 75-Ω lines without termination causes reflections and signal integrity degradation. For such applications, use dedicated line drivers or add series termination. SN74ABT16823DL's design focus is bus interfacing - not RF or high-speed serial link driving.