Texas Instruments SN74LVC823APWR

Overview

SN74LVC823APWR 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, supports mixed-mode 3.3-V/5-V I/O, and delivers 7.9 ns max propagation delay at 3.3 V - ideal for high-speed I/O buffering in industrial control backplanes.

For engineers reviewing the SN74LVC823APWR datasheet, SN74LVC823APWR pinout, SN74LVC823APWR application, or SN74LVC823APWR equivalent, key selection considerations include its 24-pin TSSOP package, Ioff partial-power-down support, 5.5-V-tolerant inputs, 9-channel noninverting latch architecture, and compatibility with capacitive bus loading in embedded data acquisition systems.

Technical Context

The SN74LVC823APWR implements nine edge-triggered D-type flip-flops synchronized to the rising edge of CLK, with CLKEN enabling/disabling the clock path independently per channel. Its OE input places all nine Q outputs into high-impedance without affecting internal state retention or clocking behavior.

It uses LVC logic family silicon with Ioff circuitry that disables outputs during power-down to prevent current backflow, and supports 5.5-V-tolerant inputs regardless of VCC (1.65–3.6 V), enabling direct interfacing between 3.3-V logic domains and legacy 5-V peripherals.

Key Specifications

Pinout & Package

TSSOP-24 (PW) package: 7.9 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, lead-free NIPDAU finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC823APWR, SN74LVC821APWR offers identical performance in an 8-bit configuration but lacks the ninth channel required for full-width industrial bus protocols; SN74ALVC16834DGGR extends bit width and drive capability but removes hardware-level fault recovery via CLR, increasing firmware complexity in safety-critical applications.

Availability

SN74LVC823APWR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, FPGA configuration bridges, and test equipment digital pattern generators requiring stable component supply across long production lifecycles.

Supply support for SN74LVC823APWR 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 experience in industrial and automotive-grade interface ICs.

The SN74LVC823APWR belongs to TI's LVC logic family - engineered for low-voltage, high-speed bus interfacing with robust mixed-signal compatibility and partial-power-down resilience in harsh operating environments.

FAQ

What is the maximum clock frequency supported by the SN74LVC823APWR?

The SN74LVC823APWR supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 2.7 V to 3.3 V). This specification is validated across the full industrial temperature range (–40°C to +85°C) and assumes proper PCB layout, decoupling, and signal integrity practices. The SN74LVC823APWR achieves this performance while maintaining 7.9 ns max propagation delay at 3.3 V.

Does the SN74LVC823APWR support 5-V input signals when powered at 3.3 V?

Yes, the SN74LVC823APWR supports input voltages up to 5.5 V regardless of VCC (1.65 V to 3.6 V), enabling direct interfacing with 5-V TTL or CMOS outputs without external level shifters. This mixed-mode capability is explicitly confirmed in the TI datasheet's "Features" and "Recommended Operating Conditions" tables for the SN74LVC823APWR.

What is the purpose of the Ioff feature in the SN74LVC823APWR?

The Ioff feature in the SN74LVC823APWR disables output buffers when VCC = 0 V, limiting off-state current to ±10 µA. This prevents damaging current backflow from live buses into a powered-down device - a critical requirement for hot-pluggable I/O modules and partial-power-down architectures. The SN74LVC823APWR implements Ioff per JEDEC JESD78 compliance.

Can the SN74LVC823APWR be used in place of the SN74LVC823ADBR?

No - the SN74LVC823APWR and SN74LVC823ADBR share identical logic functionality and electrical specifications but differ in package: SN74LVC823APWR uses TSSOP-24 (PW), while SN74LVC823ADBR uses SSOP-24 (DB). Their footprints are not interchangeable; PCB layout must match the 7.9 × 4.4 mm PW outline, not the 8.2 × 5.3 mm DB outline. The SN74LVC823APWR requires its specific land pattern per TI's PW0024A mechanical drawing.

How does the CLKEN pin function in the SN74LVC823APWR?

In the SN74LVC823APWR, CLKEN is an active-low clock enable input: when low, it permits CLK transitions to trigger data capture on all nine D inputs; when high, it blocks the clock path and holds Q outputs unchanged regardless of further CLK activity. This enables deterministic data freeze without altering internal state - a key capability for glitch-free test mode entry and synchronized multi-device updates in the SN74LVC823APWR.