Texas Instruments SN74LV74APWRG4

Overview

SN74LV74APWRG4 from Texas Instruments is a dual positive-edge-triggered D-type flip-flop IC designed for 2-V to 5.5-V operation, featuring 8.5 ns maximum propagation delay at 5 V, Ioff partial-power-down support, and mixed-mode voltage interface capability. It serves as a synchronous storage element in clock-domain crossing, state machine sequencing, and data latching circuits within industrial control and embedded logic systems.

For engineers reviewing the SN74LV74APWRG4 datasheet, SN74LV74APWRG4 pinout, SN74LV74APWRG4 application, or SN74LV74APWRG4 equivalent, key selection considerations include its 14-pin TSSOP package, dual independent flip-flop architecture with asynchronous preset/clear, guaranteed timing across 2.5 V/3.3 V/5 V supply rails, and Ioff-enabled backflow protection during power sequencing.

Technical Context

This device implements two identical, independent D-type flip-flops, each with asynchronous active-low preset (PRE) and clear (CLR), synchronous positive-edge clock (CLK), data input (D), and complementary outputs (Q and Q). Operation is defined by a function table where PRE/CLR override clocked behavior, and data transfers only on rising CLK edges when both are high.

The IC uses low-voltage CMOS (LV) process technology, enabling rail-to-rail input tolerance up to 5.5 V regardless of VCC, output drive capability of ±12 mA at 4.5–5.5 V, and robust ESD protection exceeding 2000-V HBM and 500-V CDM. Its Ioff circuitry disables outputs during power-down to prevent current backflow between powered and unpowered system domains.

Key Specifications

Pinout & Package

TSSOP-14 (PW) package: 5.00 mm × 4.40 mm body, 0.65 mm lead pitch, surface-mount, RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV74APWRG4, SN74LVC74APWR offers higher speed and lower voltage operation but sacrifices Ioff-based power sequencing safety, while 74AUP2G74DC,125 reduces footprint and static current at the cost of channel count and asynchronous control flexibility.

Availability

SN74LV74APWRG4 is available at Aetrix Electronics and suitable for programmable logic controllers, server motherboards, distributed control systems, and AV receivers requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for SN74LV74APWRG4 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 industrial, automotive, and communications markets.

The SN74LV74A product line delivers low-voltage, high-speed dual D-type flip-flops optimized for mixed-signal system interfacing, power-aware logic design, and robust operation in electrically noisy environments.

FAQ

What is the maximum clock frequency supported by SN74LV74APWRG4?

SN74LV74APWRG4 supports up to 130 MHz maximum toggle frequency at VCC = 5 V with CL = 15 pF, and 70 MHz at VCC = 3.3 V under the same load. These values are specified in the switching characteristics tables and assume proper layout, decoupling, and signal integrity practices. The actual achievable frequency in a given design depends on PCB trace length, fanout, and termination.

Does SN74LV74APWRG4 support partial power-down operation?

Yes, SN74LV74APWRG4 includes Ioff circuitry that disables outputs when VCC = 0 V, preventing damaging current backflow between powered and unpowered sections of a system. This feature is explicitly documented in the datasheet's Features and Detailed Description sections and is verified across the full –40°C to +125°C temperature range.

Can SN74LV74APWRG4 interface directly with 5-V logic while operating at 3.3 V VCC?

Yes, SN74LV74APWRG4 inputs are overvoltage tolerant up to 5.5 V regardless of VCC level. When powered at 3.3 V, it safely accepts 5-V TTL or CMOS signals on all inputs (PRE, CLR, CLK, D), making it ideal for down-translation in mixed-voltage systems without external level shifters.

What is the purpose of the complementary Q and Q outputs on SN74LV74APWRG4?

The complementary Q and Q outputs on SN74LV74APWRG4 provide true and inverted versions of the stored data bit, enabling direct connection to differential receivers, reducing external inverter count in bus-driving applications, and supporting set/reset feedback loops in state machines. Both outputs switch simultaneously with matched propagation delays.

How does SN74LV74APWRG4 handle metastability during asynchronous input capture?

SN74LV74APWRG4 does not include built-in metastability hardening; it relies on external synchronization techniques. Its short propagation delay (8.5 ns max) and tight setup/hold times (e.g., 3 ns tsu at 5 V) minimize metastability window duration, but designers must implement multi-stage synchronizers when capturing truly asynchronous signals like external interrupts or sensor pulses.