Texas Instruments SN74LVC2G74DCURE4

Overview

SN74LVC2G74 from Texas Instruments is a single positive-edge-triggered D-type flip-flop with asynchronous clear (CLR) and preset (PRE), designed for 1.65 V to 5.5 V operation, featuring 5.9 ns maximum propagation delay at 3.3 V, ±24 mA output drive, and Ioff support for live insertion and partial-power-down applications - used in LED displays, telecom infrastructure, and I/O expanders.

For engineers reviewing the SN74LVC2G74 datasheet, SN74LVC2G74 pinout, SN74LVC2G74 application, or SN74LVC2G74 equivalent, this page delivers verified functional identity, validated VSSOP-8 pin mapping, confirmed timing and drive specs across temperature, and two rigorously cross-checked alternative parts for logic-level DFF selection in space-constrained industrial and communications systems.

Technical Context

This device implements a synchronous edge-triggered storage cell with dual asynchronous control inputs (PRE/CLR), where clock triggering occurs at a defined voltage threshold-not dependent on input slew rate-enabling robust timing in mixed-voltage systems. Its Ioff circuitry actively disables outputs during power-down, preventing back-drive current flow.

It supports voltage translation (e.g., 5 V inputs to 3.3 V or 1.8 V outputs), accepts input voltages up to 5.5 V regardless of VCC, and maintains guaranteed setup/hold times (1.3 ns tsu, 0.5 ns th at 3.3 V, –40°C to +125°C) and switching performance up to 140 MHz at full temperature range.

Key Specifications

Pinout & Package

VSSOP-8 (DCU) package: 2.30 mm × 2.00 mm body, 0.5 mm pitch, exposed pad not present, RoHS-compliant NIPDAU finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2G74, SN74LVC1G74DBVR saves board area but sacrifices functional completeness, while 74LVC2G74GM,132 offers identical functionality with automotive qualification - making it suitable for safety-critical deployments where SN74LVC2G74's industrial rating is insufficient.

Availability

SN74LVC2G74 is available at Aetrix Electronics and suitable for LED displays, telecom infrastructure, and industrial I/O expanders requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across temperature extremes.

Supply support for SN74LVC2G74 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 expertise in high-reliability interface and timing ICs.

SN74LVC2G74 belongs to the LVC logic family - engineered for low-voltage, high-speed, mixed-signal interfacing in space-constrained industrial, communications, and computing systems where voltage translation and power-aware design are essential.

FAQ

What is the maximum clock frequency supported by SN74LVC2G74 across its full operating temperature range?

The SN74LVC2G74 supports up to 140 MHz maximum clock frequency when operated from –40°C to +125°C at VCC = 3.3 V, as specified in Section 6.7 of the datasheet. At 25°C and 3.3 V, fmax reaches 200 MHz. This frequency capability is enabled by its 5.9 ns typical propagation delay and tightly controlled setup/hold timing margins, making SN74LVC2G74 suitable for high-speed control loops and data capture applications.

Does SN74LVC2G74 support operation at 1.8 V, and what are the key timing implications?

Yes, SN74LVC2G74 is fully specified for 1.65 V to 5.5 V VCC operation, including 1.8 V. At 1.8 V, the maximum clock frequency drops to 120 MHz (–40°C to +125°C), and propagation delay increases to 6.2 ns (max). Setup time rises to 2.9 ns and hold time remains 0 ns minimum, per Section 6.6. These values ensure reliable operation in low-power IoT sensor nodes and battery-powered peripherals where 1.8 V rails are standard.

How does the Ioff feature of SN74LVC2G74 protect the system during partial power-down?

The Ioff feature in SN74LVC2G74 disables all outputs when VCC = 0 V, limiting Ioff current to ±10 μA maximum. This prevents reverse current flow from powered sections (e.g., 3.3 V backplane) into the unpowered SN74LVC2G74, eliminating risk of latch-up or damage during hot-swap, firmware updates, or staged power sequencing - a critical safeguard in modular server and telecom equipment where SN74LVC2G74 manages inter-board control signals.

Can SN74LVC2G74 accept 5 V input signals while operating at 3.3 V VCC, and is external protection required?

Yes, SN74LVC2G74 accepts input voltages up to 5.5 V regardless of VCC level, including when VCC = 3.3 V. Its inputs are overvoltage tolerant by design, so no external clamping diodes or level shifters are needed. This capability is explicitly confirmed in Section 1 (Features) and Section 6.3 (Recommended Operating Conditions), enabling direct interfacing between legacy 5 V controllers and modern 3.3 V logic domains using SN74LVC2G74 as a robust, pin-efficient bridge.

What is the purpose of the PRE and CLR pins on SN74LVC2G74, and how do they interact with the clock?

PRE (pin 7) and CLR (pin 6) are asynchronous active-low inputs on SN74LVC2G74: pulling PRE low forces Q = 1 and Q̅ = 0 immediately, while pulling CLR low forces Q = 0 and Q̅ = 1 - both actions occur independently of the clock signal and override any ongoing synchronous operation. When both are high, SN74LVC2G74 functions as a standard positive-edge-triggered DFF. This dual-control architecture makes SN74LVC2G74 ideal for hardware reset, emergency stop, and initialization sequences in safety-critical systems.