Texas Instruments SN74LVC823ADWR

Overview

SN74LVC823ADWR from Texas Instruments is a 9-bit bus-interface D-type flip-flop with 3-state outputs, designed for 1.65 V to 3.6 V operation. It features clock-enable (CLKEN), asynchronous clear (CLR), and buffered output-enable (OE) controls, delivers 7.9 ns max propagation delay at 3.3 V, supports mixed-mode 5-V input tolerance, and is used in I/O port buffering and bidirectional bus interfacing in industrial control and data acquisition systems.

For engineers reviewing the SN74LVC823ADWR datasheet, SN74LVC823ADWR pinout, SN74LVC823ADWR application, or SN74LVC823ADWR equivalent, key selection criteria include 3-state drive capability, Ioff partial-power-down support, 24-pin TSSOP package compatibility, and timing compliance for synchronous bus register designs operating across 1.65–3.6 V supply rails.

Technical Context

This device implements nine edge-triggered D-type flip-flops with noninverting outputs, synchronized to the rising edge of CLK when CLKEN is low. Its 3-state outputs are independently controlled by OE, which does not affect internal latch state-enabling data retention during high-impedance output mode.

The SN74LVC823ADWR integrates Ioff circuitry to disable outputs during power-down, preventing backflow current, and accepts 5.5 V-tolerant inputs while operating from 1.65–3.6 V VCC-making it suitable for level translation between 3.3-V logic domains and legacy 5-V peripherals.

Key Specifications

Pinout & Package

SN74LVC823ADWR is housed in a 24-pin TSSOP (PW) package, 7.8 mm × 4.4 mm footprint, 1.2 mm max height, with gull-wing leads and pin 1 index marking. The package is RoHS-compliant, moisture sensitivity level 1, and rated for reflow up to 260°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC823ADWR, SN74LVC821ADWR offers identical performance in an 8-bit configuration but requires PCB redesign for 9-bit interfaces, while SN74ALVC162244DGGR provides wider bus width and dual-supply translation but lacks clocked storage-making neither a functional replacement without architecture changes.

Availability

SN74LVC823ADWR is available at Aetrix Electronics and suitable for industrial control, automotive body electronics, and medical data acquisition systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74LVC823ADWR 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, with over 50 years of leadership in industrial and automotive electronics.

The SN74LVC823ADWR belongs to TI's LVC logic family-designed for high-speed, low-voltage, 3.3-V–compatible digital interfacing with robust noise immunity and mixed-voltage interoperability.

FAQ

What is the maximum clock frequency supported by SN74LVC823ADWR?

The SN74LVC823ADWR supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 3.3 V, TA = 25°C), as confirmed by its minimum clock pulse width (tw) and setup/hold time specifications. This rating assumes proper signal integrity, load capacitance ≤50 pF, and clean power delivery. At lower VCC (e.g., 1.8 V), fmax reduces to 150 MHz only if timing margins are verified per the switching characteristics table.

Does SN74LVC823ADWR support partial power-down via Ioff?

Yes, SN74LVC823ADWR fully supports partial-power-down operation via its Ioff feature. When VCC = 0 V, the Ioff circuitry disables all outputs, limiting off-state leakage to ±10 µA (per JESD78), preventing damaging back-current flow from live buses into the unpowered device-a requirement for hot-swap and modular system designs.

Can SN74LVC823ADWR interface directly with 5-V logic inputs?

Yes, SN74LVC823ADWR accepts input voltages up to 5.5 V on all data, clock, and control pins-even when VCC is as low as 1.65 V. This 5-V-tolerant input capability enables direct connection to legacy 5-V CMOS or TTL outputs without external level shifters, making it ideal for mixed-voltage system upgrades.

What is the purpose of the CLKEN pin on SN74LVC823ADWR?

The CLKEN (clock enable) pin on SN74LVC823ADWR is an active-low control that gates the internal clock buffer. When CLKEN = L, the device operates normally-sampling D inputs on CLK↑. When CLKEN = H, the clock path is disabled and outputs retain their last state, providing transparent latch behavior without requiring external gating logic or additional control lines.

Is SN74LVC823ADWR pin-compatible with other packages in the same family?

No, SN74LVC823ADWR (TSSOP-24, PW package) is not pin-compatible with other SN74LVC823A variants like SN74LVC823ADW (SOIC-24, DW) or SN74LVC823ADBR (SSOP-24, DB), despite identical logic function and pin numbering. Mechanical dimensions, lead pitch (0.65 mm for PW vs. 1.27 mm for DW), and thermal pad presence differ-requiring separate PCB footprints and layout validation.