Texas Instruments SN74LVC823ADW

Overview

SN74LVC823ADW 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 V_CC operation. It features clock-enable (CLKEN), asynchronous clear (CLR), and buffered output-enable (OE) controls, supports mixed-mode 5-V/3.3-V I/O, and delivers 7.9 ns max propagation delay at 3.3 V - ideal for high-speed data latching in industrial I/O port expansion and bidirectional bus buffering applications.

For engineers reviewing the SN74LVC823ADW datasheet, SN74LVC823ADW pinout, SN74LVC823ADW application, or SN74LVC823ADW equivalent, key selection considerations include its 24-pin SOIC (DW) package, I_off partial-power-down support, 3.6 V absolute maximum input voltage tolerance, and compatibility with capacitive bus loads up to 50 pF per output.

Technical Context

This device implements nine edge-triggered D-type flip-flops with noninverting inputs and independent 3-state output control via OE. CLKEN gates the clock path to enable/disable synchronous data capture on the rising edge of CLK, while CLR asynchronously forces all Q outputs low regardless of clock state.

Its I_off circuitry disables outputs during power-down to prevent backflow current, and input structures accept 0–5.5 V signals even when V_CC = 1.65 V–3.6 V - enabling direct interfacing between 3.3-V logic and legacy 5-V systems without level shifters.

Key Specifications

Pinout & Package

SN74LVC823ADW is housed in a 24-pin SOIC (DW) package measuring 7.5 mm × 15.4 mm × 2.35 mm (max height), with standard JEDEC MO-150 compliance and RoHS-compliant 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 SN74LVC823ADW, SN74LVC821ADW offers reduced channel count and missing reset capability but shares pin compatibility and timing performance, while 74ALVC162373DGGR provides double the width at the cost of incompatible packaging and control architecture - making SN74LVC823ADW uniquely suited for 9-bit, reset-enabled, space-constrained bus interface roles.

Availability

SN74LVC823ADW is available at Aetrix Electronics and suitable for industrial I/O expansion, memory interface buffering, FPGA-to-microcontroller bridging, and mixed-voltage system translation requiring stable component supply and long-term production continuity.

Supply support for SN74LVC823ADW 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 50 years of innovation in high-reliability digital interface ICs.

The SN74LVC823A product line was developed specifically for robust, low-voltage bus interfacing in industrial control, test equipment, and communications infrastructure - emphasizing mixed-signal compatibility, power-down safety, and timing precision.

FAQ

What is the maximum clock frequency supported by SN74LVC823ADW?

The SN74LVC823ADW supports a maximum clock frequency of 150 MHz at V_CC = 3.3 V, as specified in the Switching Characteristics table. This value is measured under recommended operating conditions with CL = 50 pF and VIH/VIL thresholds met. At lower V_CC levels (e.g., 1.8 V), f_max decreases to 150 MHz minimum per datasheet, though actual achievable frequency depends on load capacitance and signal integrity. The SN74LVC823ADW maintains consistent timing across its full –40°C to +85°C operating range.

Does SN74LVC823ADW support partial power-down operation?

Yes, SN74LVC823ADW includes I_off circuitry that actively disables outputs when V_CC = 0 V, limiting current flow to ±10 µA even when input or output pins are biased to 5.5 V. This feature is explicitly validated per JESD78 and enables safe operation in hot-swap, multi-rail, or power-gated systems. The I_off specification applies across the full –40°C to +85°C temperature range and requires no external components to function.

Can SN74LVC823ADW interface directly with 5-V logic devices?

Yes, SN74LVC823ADW accepts input voltages up to 5.5 V regardless of V_CC level (1.65 V–3.6 V), enabling direct connection to 5-V TTL or CMOS outputs without level-shifting circuitry. Its outputs swing rail-to-rail (0 V to V_CC) and are 5.5-V-tolerant in high-impedance state. When driving 5-V inputs, external pull-up resistors may be needed to meet VIH thresholds, but SN74LVC823ADW itself requires no modification for 5-V interface use.

What is the function of the CLKEN pin on SN74LVC823ADW?

The CLKEN pin on SN74LVC823ADW is an active-low clock enable that gates the internal clock buffer. When CLKEN = L, the device operates normally - capturing data on the rising edge of CLK. When CLKEN = H, the clock path is disabled and all Q outputs retain their last latched state, effectively freezing the register contents without affecting OE or CLR functionality. This allows synchronous data hold during bus arbitration or power management events.

Is SN74LVC823ADW pin-compatible with other packages in the SN74LVC823A family?

No, SN74LVC823ADW is not pin-compatible with other SN74LVC823A variants such as SN74LVC823APW (TSSOP-24), SN74LVC823ADBR (SSOP-24), or SN74LVC823ADGVR (TVSOP-24). While all share identical logic functionality and 24-pin count, their physical footprints differ significantly: DW (SOIC) has 1.27 mm pitch and 7.5 mm width, PW (TSSOP) has 0.65 mm pitch and 4.4 mm width, DB (SSOP) has 0.635 mm pitch and 5.3 mm width, and DGV (TVSOP) has 0.5 mm pitch and 4.4 mm width - requiring unique PCB layouts for each package.