Texas Instruments SN74LV273ADBRG4

Overview

SN74LV273ADBRG4 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 provides eight independent data latches, 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. It is used in industrial I/O modules and HMI systems requiring synchronized data retention under wide supply voltage ranges.

For engineers reviewing the SN74LV273ADBRG4 datasheet, SN74LV273ADBRG4 pinout, SN74LV273ADBRG4 application, or SN74LV273ADBRG4 equivalent, key selection criteria include its 20-pin TSSOP (PW) package, guaranteed t_pd ≤ 10.5 ns at 5 V, I_off leakage < 5 µA at 0 V, ±25 mA output drive, and operation from –40°C to 125°C.

Technical Context

The SN74LV273ADBRG4 implements eight identical D-type flip-flops sharing a common clock (CLK) and asynchronous clear (CLR) input. Each flip-flop captures D-input data on the rising edge of CLK and holds it until the next active clock edge or CLR assertion. The device uses balanced CMOS push-pull outputs capable of sourcing and sinking up to ±25 mA per channel.

Its I_off circuitry actively disables all outputs when V_CC = 0 V, preventing backflow current during partial power-down. Input voltage tolerance extends to 5.5 V regardless of V_CC, enabling level translation from higher-voltage logic domains into the device's operating range.

Key Specifications

Pinout & Package

The SN74LV273ADBRG4 is supplied in a 20-pin TSSOP (PW) package measuring 6.5 mm × 7.8 mm, with exposed thermal pad on RGY/RKS variants - not applicable to this DBRG4 variant. Pin numbering follows standard JEDEC top-view convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV273ADBRG4, SN74LVC273APWR offers better speed at lower voltages but sacrifices 5.5 V input tolerance, while 74LVX273M lacks I_off and has slower timing - making SN74LV273ADBRG4 the sole choice for mixed-voltage, hot-swap-capable industrial control.

Availability

SN74LV273ADBRG4 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 mixed-voltage conditions.

Supply support for SN74LV273ADBRG4 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 delivering analog and embedded processing solutions, with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74LV273ADBRG4 belongs to TI's LV logic family, engineered for robust performance in industrial automation systems where wide supply range, hot-swap safety, and noise immunity are mandatory.

FAQ

What is the maximum clock frequency supported by the SN74LV273ADBRG4?

The SN74LV273ADBRG4 supports up to 120 MHz maximum clock frequency at V_CC = 5 V with 15 pF load, and 75 MHz at V_CC = 3.3 V under same conditions. These values are specified in the Switching Characteristics tables and assume proper layout, decoupling, and load capacitance ≤50 pF. Real-world achievable frequency depends on board parasitics and signal integrity margins.

Does the SN74LV273ADBRG4 support partial power-down mode?

Yes, the SN74LV273ADBRG4 supports partial power-down mode via its I_off circuitry. When V_CC = 0 V, all outputs are disabled and leakage current is limited to < 5 µA per pin, preventing backflow current from live buses into the unpowered device - a critical feature for hot-swap and power-sequenced systems.

What is the function of the CLR pin on the SN74LV273ADBRG4?

The CLR pin on the SN74LV273ADBRG4 is an asynchronous active-low clear input. When asserted LOW, it immediately forces all eight Q outputs to LOW, independent of the clock signal. This function is essential for system initialization, fault recovery, and deterministic reset in safety-critical industrial control applications.

Can the SN74LV273ADBRG4 accept 5 V input signals while operating at 3.3 V V_CC?

Yes, the SN74LV273ADBRG4 features 5.5 V-tolerant inputs. It can safely accept 5 V logic signals on all input pins - including D, CLK, and CLR - while operating at V_CC = 3.3 V or even 2.5 V. This eliminates external level shifters in mixed-voltage systems and simplifies interface design with legacy 5 V controllers.

What package type is used for the SN74LV273ADBRG4?

The SN74LV273ADBRG4 uses a 20-pin TSSOP (Thin Shrink Small Outline Package) with body dimensions of 6.5 mm × 7.8 mm. This surface-mount package is RoHS-compliant, optimized for automated assembly, and provides adequate thermal performance for industrial logic applications without requiring heatsinking.