Diodes Incorporated 74LVC273AQ20-13

Overview

74LVC273AQ20-13 from Diodes Incorporated is an octal positive-edge-triggered D-type flip-flop with asynchronous clear, implemented in V-QFN4525-20 (2.5 mm × 4.5 mm) package. It operates across 1.65V–3.6V supply, sinks/sources ±24 mA at V_CC = 3.0V, supports IOFF for partial power-down isolation, and accepts 5.5V-tolerant inputs-enabling mixed-voltage interfacing in bus-hold and signal-synchronization circuits.

For engineers reviewing the 74LVC273AQ20-13 datasheet, 74LVC273AQ20-13 pinout, 74LVC273AQ20-13 application, or 74LVC273AQ20-13 equivalent, key selection criteria include propagation delay (≤7.3 ns @ 3.3V), setup/hold timing (1.5 ns / 1.0 ns), output skew (≤1.5 ns), IOFF leakage (<20 µA), and QFN thermal resistance (θ_JA = 67 °C/W).

Technical Context

This device implements eight independent D-type latches synchronized to the rising edge of CLK, each with dedicated D input and Q output, plus a shared active-low asynchronous CLR that forces all Q outputs low regardless of clock state. The IOFF circuit disables outputs when V_CC = 0V, preventing back-current flow during partial power-down sequences in multi-rail systems.

All inputs feature Schmitt-trigger action for noise immunity, and outputs meet LVC-level drive strength with guaranteed VOL ≤ 0.80 V and VOH ≥ 2.0 V under full load (24 mA). Input voltage tolerance up to 5.5V allows direct interfacing with legacy 5V logic without level shifters.

Key Specifications

Pinout & Package

V-QFN4525-20 (2.5 mm × 4.5 mm × 0.95 mm, 0.50 mm pitch, exposed thermal pad) with 20 terminals; RoHS-compliant, halogen-free "Green" construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC273APWR, the 74LVC273AQ20-13 offers 12% lower thermal resistance and 35% smaller area; versus 74AUP273GN, it delivers 23% faster propagation at 3.3V but consumes ~3× more quiescent current.

Availability

74LVC273AQ20-13 is available at Aetrix Electronics and suitable for PCB-level bus isolation, multi-rail power sequencing, legacy interface bridging, and industrial control signal latching requiring stable component supply and QFN-20 compatibility.

Supply support for 74LVC273AQ20-13 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and integrated circuits, specializing in high-performance, energy-efficient solutions for consumer, computing, industrial, and automotive markets.

The 74LVC273A belongs to Diodes' LVC logic family, designed specifically for low-voltage, mixed-signal interfacing where robustness, timing precision, and power-domain isolation are critical in compact, high-density PCB layouts.

FAQ

What is the maximum clock frequency supported by the 74LVC273AQ20-13?

The 74LVC273AQ20-13 supports up to 230 MHz typical maximum frequency at V_CC = 3.3V and T_A = +25°C, with guaranteed minimum of 125 MHz over full temperature range (-40°C to +125°C). This is validated by t_W (CLK pulse width) ≥3.0 ns and t_PD ≤7.3 ns under specified load conditions.

Does the 74LVC273AQ20-13 require external pull-up or pull-down resistors on unused inputs?

No external resistors are required: unused inputs must be tied to V_CC or GND per datasheet Note 8. The device does not include internal weak pull-ups/pull-downs, so floating inputs are prohibited to avoid increased ICC and potential logic instability due to noise coupling.

Can the 74LVC273AQ20-13 be used in a 5V-only system?

No - its absolute maximum V_CC rating is +7.0V, but recommended operating V_CC is strictly 1.65V–3.6V. While inputs tolerate 5.5V, powering V_CC at 5V exceeds specification and risks parametric failure, increased ICC, and reduced reliability per Absolute Maximum Ratings table.

How is thermal performance affected by the QFN package compared to TSSOP?

The V-QFN4525-20 package provides θ_JA = 67 °C/W versus 74 °C/W for TSSOP-20 under identical JEDEC 4-layer board conditions. This 9% improvement reduces junction temperature rise by ~5°C at 100 mW dissipation, enabling higher sustained clock rates or operation in elevated ambient environments.