Texas Instruments SN74ABT823NSR

Overview

SN74ABT823NSR from Texas Instruments is a 9-bit bus-interface D-type flip-flop with 3-state outputs, designed for high-drive bidirectional bus buffering in industrial control and data acquisition systems. It features –32-mA IOH / 64-mA IOL drive strength, 125-MHz maximum clock frequency, and operates over –40°C to 85°C with 4.5–5.5-V supply voltage.

For engineers reviewing the SN74ABT823NSR datasheet, SN74ABT823NSR pinout, SN74ABT823NSR application, or SN74ABT823NSR equivalent, key selection criteria include 3-state output timing (tPZH = 1–6 ns), power-up high-impedance behavior below 2.1 V VCC, and compatibility with 5-V TTL/CMOS logic buses requiring robust drive and noise immunity.

Technical Context

This device implements nine edge-triggered D-type flip-flops with independent clock-enable (CLKEN) and asynchronous clear (CLR), enabling synchronous latching and global reset. Its buffered OE input controls all nine outputs simultaneously into high-impedance or active logic states without dc loading effects on control lines.

The EPIC-II^B BiCMOS process delivers low ground bounce (VOLP < 1 V), latch-up immunity (>500 mA per JESD-17), and ESD protection exceeding 2000 V (MIL-STD-883). Power sequencing is supported via inherent high-Z during VCC ramp between 0–2.1 V.

Key Specifications

Pinout & Package

SN74ABT823NSR is packaged in a 24-pin SSOP (Shrink Small-Outline Package), measuring 8.2 mm × 5.3 mm with 0.65-mm lead pitch. The package supports surface-mount reflow (MSL Level-1, 260°C peak) and is RoHS-compliant with NiPdAu lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT823NSR, SN74ABT821DBR offers identical performance in an 8-bit configuration but requires bus-width redesign, while SN74ALVCH162244DGGR provides wider channel count at lower voltage and drive, sacrificing clocked storage capability entirely.

Availability

SN74ABT823NSR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automated test equipment, motor control interface boards, and legacy bus bridge interfaces requiring stable component supply across long production lifecycles.

Supply support for SN74ABT823NSR 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The ABT logic family-including SN74ABT823NSR-is engineered for high-speed 5-V bus interfacing with robust noise immunity, low power, and guaranteed timing across temperature, targeting industrial control and instrumentation applications.

FAQ

What is the maximum clock frequency supported by the SN74ABT823NSR?

The SN74ABT823NSR supports a maximum clock frequency of 125 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This value is validated across the full industrial temperature range (–40°C to +85°C) and reflects guaranteed timing performance for synchronous data capture in high-speed bus interfaces. The SN74ABT823NSR achieves this with tPLH/tPHL ≤ 6.8 ns and setup/hold times as low as 1.3 ns.

Does the SN74ABT823NSR enter high-impedance state automatically during power-up?

Yes, the SN74ABT823NSR enters a high-impedance state on all nine outputs when VCC is between 0 V and 2.1 V during power-up or power-down. This behavior prevents bus contention without external circuitry. However, to guarantee high-Z above 2.1 V, OE must be tied to VCC through a pullup resistor-minimum value determined by the driver's current-sinking capability.

What are the absolute maximum ratings for output current on the SN74ABT823NSR?

The absolute maximum low-level output current (IOL) for the SN74ABT823NSR is 128 mA per output, and the absolute maximum high-level output current (IOH) is –96 mA. These stress ratings must never be exceeded in operation. For continuous reliable operation, the recommended IOL is 64 mA and IOH is –32 mA-values specified in the "recommended operating conditions" table and verified across temperature and voltage.

Can the SN74ABT823NSR be used in mixed-voltage systems with 3.3-V logic?

No, the SN74ABT823NSR is a 5-V-only device with recommended VCC of 4.5–5.5 V and input thresholds defined for TTL levels (VIH = 2 V, VIL = 0.8 V). Its inputs are not 5-V tolerant when powered from 3.3 V, and its outputs swing rail-to-rail at 5 V-making direct interfacing with 3.3-V logic unsafe without level-shifting circuitry. For 3.3-V systems, consider ALVC or LVC family alternatives.

How does the CLKEN input function in the SN74ABT823NSR?

The CLKEN input in the SN74ABT823NSR acts as a clock buffer enable: when low, it allows the CLK signal to propagate to the internal flip-flop clock inputs, enabling data capture on each CLK↑ transition; when high, it disables the clock path, freezing all Q outputs in their last valid state regardless of further CLK activity. This provides synchronous hold capability without requiring external gating logic.