Texas Instruments SN74LV273ADW

Overview

SN74LV273ADW from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with asynchronous clear, designed for 2-V to 5.5-V V_CC operation. It features 10.5 ns maximum propagation delay at 5 V, I_off support for partial-power-down mode, and mixed-mode voltage operation across all ports - enabling reliable data latching in industrial I/O modules and HMI systems.

For engineers reviewing the SN74LV273ADW datasheet, SN74LV273ADW pinout, SN74LV273ADW application, or SN74LV273ADW equivalent, this device serves as a low-power, wide-supply-voltage latch for bus interface and control signal synchronization where deterministic edge-triggered storage and robust ESD immunity (±3000 V HBM) are required.

Technical Context

The SN74LV273ADW implements eight independent D-type flip-flops sharing a common clock (CLK) and asynchronous clear (CLR) input. Each flip-flop captures data on the rising edge of CLK and holds state until next clock or clear assertion. Its balanced CMOS push-pull outputs drive up to ±12 mA at 5 V while maintaining VOL ≤ 0.55 V and VOH ≥ 3.8 V under load.

Designed for mixed-voltage system interfacing, it supports 5.5-V-tolerant inputs at any valid V_CC (2–5.5 V), enabling level translation from higher-voltage controllers to lower-voltage logic domains. The I_off feature disables outputs during power-down, preventing backflow current when V_CC = 0 V.

Key Specifications

Pinout & Package

SN74LV273ADW uses a 20-pin SOIC (DW) package measuring 12.80 mm × 10.3 mm, with standard 0.65-mm lead pitch and gull-wing leads compatible with automated SMT assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop applications.

Compared with SN74LVC273PW and 74HC273D,653, the SN74LV273ADW uniquely combines 2–5.5-V operation, 5.5-V-tolerant inputs, and I_off - making it the only option qualified for industrial hot-swap I/O modules requiring both wide supply flexibility and safe partial-power-down behavior.

Availability

SN74LV273ADW is available at Aetrix Electronics and suitable for power substation controls, industrial I/O modules, and human machine interfaces requiring stable component supply across extended temperature and long product lifecycles.

Supply support for SN74LV273ADW 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 for industrial, automotive, and communications markets.

The SN74LV273ADW belongs to TI's LV logic family, engineered for low-voltage operation with high noise immunity and robust ESD performance - specifically targeting industrial control, medical instrumentation, and infrastructure monitoring applications.

FAQ

What is the maximum clock frequency supported by the SN74LV273ADW?

The SN74LV273ADW supports up to 120 MHz maximum clock frequency at V_CC = 5 V with 15-pF load, per its switching characteristics table. At 3.3 V, f_max is 140 MHz under same conditions. Real-world operation depends on board layout, trace capacitance, and output loading - TI recommends limiting capacitive load to ≤50 pF to guarantee full-spec timing compliance across temperature.

Does the SN74LV273ADW support partial power-down mode?

Yes, the SN74LV273ADW includes I_off circuitry that disables all outputs when V_CC = 0 V, limiting leakage to 5 µA per I/O. This prevents damaging current backflow in systems with live backplanes or hot-swap capability - a key requirement for industrial I/O modules where SN74LV273ADW is commonly deployed.

Can the SN74LV273ADW interface directly with 5-V microcontrollers while operating at 3.3 V?

Yes, the SN74LV273ADW features 5.5-V-tolerant inputs, allowing direct connection to 5-V GPIOs even when powered at 3.3 V. This eliminates external level shifters in mixed-voltage designs like HMI panels using 5-V MCUs and 3.3-V peripheral logic - a verified capability documented in Section 9.1 of the SN74LV273ADW datasheet.

What is the purpose of the CLR pin on the SN74LV273ADW?

The CLR (pin 1) is an asynchronous active-low clear input that forces all eight Q outputs LOW immediately, independent of the clock signal. In applications like patient monitoring, this enables hardware-initiated reset of acquired sensor states before new measurement cycles - ensuring deterministic startup and fault recovery without waiting for clock edges.

Is the SN74LV273ADW RoHS-compliant and halogen-free?

Yes, the SN74LV273ADW is RoHS-compliant and halogen-free per TI's official packaging information. The DW package (SOIC-20) carries the "Green" designation, meeting JEDEC JS-001 HBM ESD standards and IPC/JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) for surface-mount assembly.