Texas Instruments SN74ABT823DBRG4

Overview

SN74ABT823DBRG4 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 and embedded systems. It features –32-mA IOH / 64-mA IOL drive strength, 125-MHz maximum clock frequency, and operates over –40°C to 85°C. Used in I/O port expansion and parity-enabled bus drivers.

For engineers reviewing the SN74ABT823DBRG4 datasheet, SN74ABT823DBRG4 pinout, SN74ABT823DBRG4 application, or SN74ABT823DBRG4 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-level control signals.

Technical Context

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

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

Key Specifications

Pinout & Package

SN74ABT823DBRG4 uses a 24-pin Shrink Small-Outline Package (SSOP, DB), 0.209-inch body width, 0.025-inch pitch, JEDEC MO-150 compliant. Pin 1 located in Q1 quadrant of tape reel.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT823DBRG4, SN74ABT821DBR offers identical performance in an 8-bit configuration but omits the ninth channel, while SN74LVC823APWR shifts to 3.3-V operation with reduced drive and incompatible pin mapping-neither is pin-compatible, and both require PCB or voltage-domain changes.

Availability

SN74ABT823DBRG4 is available at Aetrix Electronics and suitable for industrial automation, embedded I/O expansion, and telecom backplane interface applications requiring stable component supply and long-term lifecycle support.

Supply support for SN74ABT823DBRG4 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 SN74ABT823DBRG4, was engineered for high-speed, high-drive 5-V bus interfacing with robust noise immunity and power sequencing safety in mission-critical industrial systems.

FAQ

What is the recommended operating voltage range for SN74ABT823DBRG4?

The SN74ABT823DBRG4 is specified for operation from 4.5 V to 5.5 V. Operation outside this range may result in undefined logic states or degraded timing performance. The device enters a guaranteed high-impedance state when VCC is between 0 and 2.1 V, but full functionality requires VCC ≥ 4.5 V per the recommended operating conditions table in the datasheet.

Does SN74ABT823DBRG4 support hot-swap operation?

Yes, SN74ABT823DBRG4 supports hot-swap operation through its inherent power-up/power-down high-impedance feature: when VCC is between 0 and 2.1 V, all outputs remain in high-Z state regardless of OE, CLK, or other inputs. This prevents bus contention during insertion or removal, provided OE is tied to VCC via a pullup resistor for reliable high-Z above 2.1 V.

What is the maximum clock frequency supported by SN74ABT823DBRG4?

The SN74ABT823DBRG4 supports a maximum clock frequency of 125 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). At temperature extremes (–40°C to 85°C) and across VCC (4.5–5.5 V), timing parameters are guaranteed to meet this frequency limit with appropriate setup/hold margins as defined in the datasheet's timing requirements table.

How does the CLKEN input function in SN74ABT823DBRG4?

In SN74ABT823DBRG4, CLKEN is an active-low clock enable input. When CLKEN is low, the internal clock buffer is enabled and data propagates from D to Q on each rising CLK edge. When CLKEN is high, the clock path is disabled, freezing the Q outputs at their last latched values - effectively providing synchronous hold functionality without requiring external gating logic.

Can SN74ABT823DBRG4 drive a 50-pF load at 125 MHz?

Yes, SN74ABT823DBRG4 is characterized for CL = 50 pF in its switching characteristics table, with tPLH/tPHL ≤ 6.8 ns and fmax = 125 MHz at VCC = 5 V and TA = 25°C. Its –32-mA/64-mA drive strength ensures signal integrity into typical board-trace-plus-load capacitance, making it suitable for driving 50-pF loads at full rated speed without external termination.