Texas Instruments 74ACT16823DLR

Overview

74ACT16823DLR from Texas Instruments is an 18-bit bus-interface D-type flip-flop with 3-state outputs, designed for high-capacitance bus driving in wide data/address paths. It operates at 5 V ±0.5 V, supports 90 MHz clock frequency, features TTL-compatible inputs, and is rated for –40°C to 85°C industrial temperature range.

For engineers reviewing the 74ACT16823DLR datasheet, 74ACT16823DLR pinout, 74ACT16823DLR application, or 74ACT16823DLR equivalent, key selection criteria include 3-state output drive capability (±24 mA), low propagation delay (tPLH/tPHL ≤12.9 ns), flow-through pin architecture, distributed VCC/GND layout for noise suppression, and SSOP-56 package compatibility with high-density PCB routing.

Technical Context

This device implements two independent 9-bit D-type flip-flop sections, each with dedicated clock-enable (CLKEN), clear (CLR), and output-enable (OE) controls. Clocking is edge-triggered on low-to-high transitions when CLKEN is low; asserting CLKEN high latches outputs regardless of clock activity.

The 3-state OE control operates independently of internal flip-flop state-data retention and new input capture continue while outputs are in high-impedance mode. Input and output structures are optimized for EPIC™ 1-µm CMOS process, delivering TTL-voltage compatibility and minimized switching noise via distributed power/ground pins.

Key Specifications

Pinout & Package

74ACT16823DLR uses a 56-pin Shrink Small-Outline Package (SSOP-DL), 380-mil body width, 25-mil pin pitch, RoHS-compliant NiPdAu finish, MSL Level-1, and tape-and-reel packaging (1000 units/reel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74ACT16823DLR, the 74ACT16374DLR offers reduced pin count and cost but sacrifices 2-bit width and dual-section flexibility, while SN74LVC16373ADGGR enables modern low-voltage operation but mandates voltage translation in legacy 5-V environments.

Availability

74ACT16823DLR is available at Aetrix Electronics and suitable for industrial I/O expansion, memory interface buffering, parity bus interfacing, and legacy system bus isolation requiring stable component supply and long-term production continuity.

Supply support for 74ACT16823DLR 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 industrial and automotive ICs.

The 74ACT16823DLR belongs to TI's Widebus™ family of high-speed bus-interface logic, engineered specifically for noise-resilient, high-density PCB implementations in industrial control and communications infrastructure.

FAQ

What is the maximum clock frequency supported by the 74ACT16823DLR?

The 74ACT16823DLR supports a maximum clock frequency of 90 MHz under recommended operating conditions (VCC = 5 V ±0.5 V, TA = –40°C to +85°C). This value is guaranteed by timing characterization across temperature and voltage extremes, enabling use in high-speed synchronous bus applications such as memory controllers and I/O expanders where precise edge-aligned sampling is required.

Does the 74ACT16823DLR support independent control of its two 9-bit sections?

Yes, the 74ACT16823DLR provides fully independent control for each 9-bit section: separate CLK, CLKEN, CLR, and OE inputs allow asynchronous reset, clock gating, and 3-state output control per section. This enables flexible usage-for example, one section can latch address bits while the other buffers data, with no shared timing constraints or signal coupling.

What package type and pin count does the 74ACT16823DLR use?

The 74ACT16823DLR uses a 56-pin Shrink Small-Outline Package (SSOP-DL) with 25-mil pin pitch and 380-mil body width. Its pinout follows TI's flow-through architecture, with inputs on one side and outputs on the opposite side, and includes eight GND and four VCC pins distributed to minimize switching noise-critical for high-speed bus integrity.

Can the 74ACT16823DLR interface directly with TTL logic levels?

Yes, the 74ACT16823DLR features TTL-voltage compatible inputs (VIH = 2 V min, VIL = 0.8 V max), allowing direct connection to standard 74LS, 74ALS, and other TTL-family outputs without level-shifting circuitry. Its 5-V supply and CMOS output structure maintain full noise margin and drive strength when interfacing with legacy TTL systems.

How does the output-enable (OE) function interact with internal flip-flop operation in the 74ACT16823DLR?

In the 74ACT16823DLR, the OE input affects only the output drivers-not the internal flip-flop state. While OE is asserted to place outputs in high-impedance, the registered data remains intact, and new data can still be clocked in via CLK/CLKEN. This enables glitch-free bus arbitration and hot-swap capability without disrupting internal register contents or timing behavior.