Texas Instruments SN74ABT823NSRE4

Overview

SN74ABT823NSRE4 from Texas Instruments is a 9-bit bus-interface D-type flip-flop with 3-state outputs, designed for high-drive bidirectional bus interfacing in industrial and embedded systems. It features –32-mA IOH / 64-mA IOL drive strength, 125-MHz maximum clock frequency, and operates across –40°C to 85°C. Used in I/O port expansion and parity-enabled bus drivers.

For engineers reviewing the SN74ABT823NSRE4 datasheet, SN74ABT823NSRE4 pinout, SN74ABT823NSRE4 application, or SN74ABT823NSRE4 equivalent, key selection criteria include 3-state output timing (tPZH = 1 ns min), power-up high-impedance behavior below 2.1 V VCC, and compatibility with 5-V TTL-level control signals.

Technical Context

This device implements nine edge-triggered D-type flip-flops with independent asynchronous clear (CLR) and clock-enable (CLKEN) logic. Each channel supports synchronous data capture on CLK rising edge when CLKEN is low, and latches outputs when CLKEN is high.

Output-enable (OE) controls all nine outputs simultaneously into high-impedance or active logic states. The BiCMOS EPIC-II^B process enables low ground bounce (VOLP < 1 V) and latch-up immunity exceeding 500 mA per JEDEC JESD-17.

Key Specifications

Pinout & Package

SN74ABT823NSRE4 is packaged in a 24-pin SSOP (DB) package with 0.64-mm lead pitch and 7.5-mm body width. Pin 1 is located at the top-left corner of the package, marked by a beveled edge or dot.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 9-bit bus-interface flip-flop applications.

Compared with SN74ABT823NSRE4, SN74ABT821NSR offers reduced channel count but identical 5-V performance and footprint, while SN74LVC823APWR trades voltage compatibility for lower power and smaller die size - neither is pin-compatible, requiring layout revision.

Availability

SN74ABT823NSRE4 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and test equipment requiring stable component supply and long-term obsolescence management.

Supply support for SN74ABT823NSRE4 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 over 90 years of innovation in industrial, automotive, and communications markets.

The SN74ABT823NSRE4 belongs to TI's ABT logic family, engineered for high-speed, high-drive 5-V bus interfacing in noise-sensitive industrial and instrumentation applications.

FAQ

What is the recommended operating voltage range for SN74ABT823NSRE4?

The SN74ABT823NSRE4 is specified to operate from 4.5 V to 5.5 V. Operation outside this range may cause unreliable logic behavior or damage. The device enters high-impedance state when VCC drops below 2.1 V during power-down, but sustained operation below 4.5 V is not guaranteed per datasheet specifications. Always maintain VCC within the recommended range for full functionality of SN74ABT823NSRE4.

Does SN74ABT823NSRE4 support hot insertion or live bus swapping?

SN74ABT823NSRE4 supports controlled hot insertion through its power-up/power-down high-impedance feature: outputs remain in high-Z when VCC is between 0 and 2.1 V. However, it lacks dedicated hot-swap protection circuitry such as slew-rate limiting or current limiting. For safe live bus swapping, external series resistors and careful power sequencing are required. The SN74ABT823NSRE4 itself does not provide fault protection beyond its inherent ESD and latch-up ratings.

How does the CLKEN input affect timing behavior of SN74ABT823NSRE4?

The CLKEN input gates the clock buffer: when CLKEN is low, the internal clock path is enabled and data is captured on CLK rising edges; when CLKEN is high, the clock path is disabled and outputs hold their last state. Setup time for CLKEN high is 2 ns, and hold time after CLK↑ is 1 ns. This allows dynamic enabling/disabling of data flow without affecting register contents - a key feature for burst-mode bus arbitration in SN74ABT823NSRE4 applications.

Can SN74ABT823NSRE4 drive a 100-pF load reliably?

The SN74ABT823NSRE4 is characterized with CL = 50 pF in timing tests, and its 64-mA IOL drive supports heavier loads than typical PCB traces. While not explicitly tested at 100 pF, the device's low output impedance (<10 Ω typical) and VOLP < 1 V indicate robust capacitive drive capability. For 100-pF loads, verify signal integrity via board-level simulation or measurement - SN74ABT823NSRE4 remains viable but may require adjusted timing margins.

Is SN74ABT823NSRE4 RoHS compliant and lead-free?

Yes, SN74ABT823NSRE4 is RoHS compliant and features NiPdAu (NIPDAU) lead finish. Per TI's packaging documentation, it carries MSL Level-1 rating with unlimited floor life and peak reflow tolerance up to 260°C. The "E4" suffix confirms TI's green packaging standard, and the part meets EU Directive 2011/65/EU requirements. Full compliance documentation is available in TI's official packaging addendum for SN74ABT823NSRE4.