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Home > Products > Integrated Circuits (ICs) > Logic > Flip Flops

Texas Instruments SN74AC574NSRE4

Name: SN74AC574NSRE4
Brand: Texas Instruments
SKU: SN74AC574NSRE4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74AC574NSRE4

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 20-SOIC (0.209", 5.30mm Width)

Datasheet:: SN74AC574NSRE4.pdf

Description:: IC FF D-TYPE SNGL 8BIT 20SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SN74AC574NSRE4 from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs, designed for bus-oriented digital systems. It operates across 2V–6V V_CC, delivers ≤8.5ns propagation delay at 5V, and features active-low output enable (OE) for bidirectional bus control in I/O port and buffer register applications.

For engineers reviewing the SN74AC574NSRE4 datasheet, SN74AC574NSRE4 pinout, SN74AC574NSRE4 application, or SN74AC574NSRE4 equivalent, this page provides verified functional identity, confirmed 20-pin NS (SOIC) package mapping, timing parameters at 3.3V/5V, 3-state drive capability, and validated alternatives for bus interface design.

Technical Context

The SN74AC574NSRE4 implements eight independent D-type latches triggered on the rising edge of CLK, with synchronous data capture and asynchronous 3-state control via OE. Its CMOS AC logic family ensures TTL-compatible input thresholds and rail-to-rail output swing across the full 2V–6V supply range.

Each channel supports high-impedance output states independent of clock activity, enabling dynamic bus sharing without contention. Input voltage tolerance up to 6V allows interfacing with mixed-voltage systems, while t_PLH/t_PHL ≤8.5ns at 5V enables reliable operation in 85MHz clock domains.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2V to 6V - supports single-supply operation across 3.3V and 5V logic domains without level shifters
Max Propagation Delay	8.5ns at V_CC = 5V - enables reliable timing closure in high-speed 8-bit data paths
Output Drive	±24mA at V_CC = 4.5V - directly drives standard 50pF bus loads without external buffers
Input Voltage Tolerance	Up to 6V - accepts 5V-tolerant inputs even when V_CC = 3.3V
3-State Enable	Active-low OE pin - disables all eight outputs simultaneously to prevent bus contention
Operating Temperature	−40°C to +85°C - qualified for industrial-grade embedded and computing applications
Package	NS (SOIC-20) - 12.8mm × 10.3mm body, surface-mount compatible with standard reflow profiles

Pinout & Package

SN74AC574NSRE4 is packaged in a 20-pin SOIC (NS) with 1.27mm pitch, 12.8mm × 10.3mm footprint, and 2.65mm max height. Pin 1 is located at the top-left corner with notch or dot marking.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Active-low output enable	Asserting low places Q1–Q8 in high-impedance state; no effect on internal latch state
2–9 (D1–D8)	Data inputs	Asynchronous inputs sampled on rising CLK edge; tolerate up to 6V regardless of V_CC
10 (GND)	Ground reference	Primary return path for logic and output current; requires local 0.1μF bypass capacitor
11 (CLK)	Clock input	Rising-edge sensitive; minimum pulse width 4ns at 5V for guaranteed registration
12–19 (Q8–Q1)	3-state outputs	Driven high/low when OE = low; tri-stated when OE = high; support bus wire-OR configurations
20 (V_CC)	Positive supply	Accepts 2V–6V; must be decoupled locally to suppress switching noise on shared power rails

Key Features

Feature	Design Value
Wide supply voltage range	2V–6V operation enables direct use in both 3.3V and 5V systems without translation
High-speed edge-triggered latching	8.5ns t_PD at 5V supports 85MHz clock rates for real-time data capture
Bus-compatible 3-state outputs	±24mA drive strength and fast enable/disable transitions (≤9ns) minimize bus turnaround time
Input overvoltage tolerance	Inputs accept up to 6V regardless of V_CC, simplifying mixed-voltage interconnect design
Industrial temperature rating	−40°C to +85°C operating range ensures reliability in harsh environmental conditions

Applications

Microcontroller I/O Expansion	Memory Address Latching
Use Scenario: Expanding GPIO count on an MCU by latching parallel data from a peripheral interface. IC Role / Device Role / Timing Role: Acts as an 8-bit output latch, capturing data on rising CLK synchronized to MCU write strobe. Use Value: Enables deterministic timing between MCU and slow peripherals using a single control signal (OE), eliminating software delays.	Use Scenario: Holding address bits stable during memory read/write cycles in 8-bit microprocessor systems. IC Role / Device Role / Timing Role: Functions as an address register, sampling address bus on rising CLK and holding until next cycle. Use Value: Reduces address bus loading and eliminates timing skew between address and control signals for reliable memory access.
Parallel Bus Transceiver Interface	Digital Test Equipment Data Capture
Use Scenario: Isolating and buffering bidirectional data buses between processor and peripheral modules. IC Role / Device Role / Timing Role: Provides direction-controlled 3-state buffering, with OE tied to bus direction signal. Use Value: Prevents bus contention during direction changes and supports hot-swap-capable system architectures.	Use Scenario: Capturing parallel test vectors from automated test equipment into diagnostic logic analyzers. IC Role / Device Role / Timing Role: Serves as a synchronous data sampler, aligning incoming signals to system clock domain. Use Value: Ensures setup/hold compliance (tsu ≥2ns, th ≥1.5ns at 5V) for accurate high-speed digital pattern acquisition.

Microcontroller I/O Expansion

Memory Address Latching

Use Scenario: Expanding GPIO count on an MCU by latching parallel data from a peripheral interface.

IC Role / Device Role / Timing Role: Acts as an 8-bit output latch, capturing data on rising CLK synchronized to MCU write strobe.

Use Value: Enables deterministic timing between MCU and slow peripherals using a single control signal (OE), eliminating software delays.

Use Scenario: Holding address bits stable during memory read/write cycles in 8-bit microprocessor systems.

IC Role / Device Role / Timing Role: Functions as an address register, sampling address bus on rising CLK and holding until next cycle.

Use Value: Reduces address bus loading and eliminates timing skew between address and control signals for reliable memory access.

Parallel Bus Transceiver Interface

Digital Test Equipment Data Capture

Use Scenario: Isolating and buffering bidirectional data buses between processor and peripheral modules.

IC Role / Device Role / Timing Role: Provides direction-controlled 3-state buffering, with OE tied to bus direction signal.

Use Value: Prevents bus contention during direction changes and supports hot-swap-capable system architectures.

Use Scenario: Capturing parallel test vectors from automated test equipment into diagnostic logic analyzers.

IC Role / Device Role / Timing Role: Serves as a synchronous data sampler, aligning incoming signals to system clock domain.

Use Value: Ensures setup/hold compliance (tsu ≥2ns, th ≥1.5ns at 5V) for accurate high-speed digital pattern acquisition.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ACT574N	TTL-compatible inputs (V_IH = 2V min), slightly higher ICC (100μA vs 40μA typical)	Better noise immunity in noisy industrial environments due to higher input threshold	Select when interfacing with legacy 5V TTL logic families requiring guaranteed VIH > 2V
74LCX574M	Lower V_CC range (2.0V–3.6V), 3.3V-only optimized, faster t_PD (5.5ns @ 3.3V)	Designed exclusively for low-voltage 3.3V systems; not 5V tolerant	Choose for power-constrained 3.3V-only designs where 5V tolerance is unnecessary

Compared with SN74ACT574N and 74LCX574M, SN74AC574NSRE4 uniquely balances 2V–6V operation, 5V tolerance, and industrial temperature range-making it optimal for mixed-voltage industrial controllers where flexibility and robustness are required.

Availability

SN74AC574NSRE4 is available at Aetrix Electronics and suitable for microcontroller I/O expansion, memory address latching, and parallel bus transceiver applications requiring stable component supply across extended temperature ranges and multi-voltage designs.

Supply support for SN74AC574NSRE4 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 and embedded processing solutions, with decades of experience in logic device design and manufacturing.

The SN74AC574NSRE4 belongs to TI's AC-series advanced CMOS logic family, engineered for high-speed, low-power, mixed-voltage digital interfacing in industrial, computing, and communications equipment.

FAQ

What is the maximum clock frequency supported by SN74AC574NSRE4 at 5V?

At V_CC = 5V ± 0.5V and T_A = 25°C, SN74AC574NSRE4 supports a maximum clock frequency of 85MHz. This is derived from the minimum clock pulse width (t_w = 5ns high/low) and verified by f_max = 85MHz in the Switching Characteristics table. Operation above this frequency risks setup/hold violations and metastability.

Does SN74AC574NSRE4 require external pull-up resistors on the OE pin?

SN74AC574NSRE4 does not require external pull-up resistors on OE for normal operation. However, during power-up/power-down sequences, TI recommends tying OE to V_CC through a pull-up resistor to ensure outputs remain in high-impedance state until system initialization completes-preventing bus contention before firmware configures the device.

Can SN74AC574NSRE4 operate reliably with a 3.3V supply?

Yes, SN74AC574NSRE4 operates reliably at 3.3V. Its recommended V_CC range is 2V–6V, and timing specifications are explicitly characterized at 3.3V ± 0.3V: t_PD ≤13.5ns, f_clock ≥55MHz, and t_su/t_h meet industrial requirements. Input thresholds scale with V_CC, ensuring compatibility with 3.3V logic families.

What is the thermal resistance (R_θJA) of the NS (SOIC-20) package for SN74AC574NSRE4?

The junction-to-ambient thermal resistance R_θJA for SN74AC574NSRE4 in the NS (SOIC-20) package is 60°C/W, as specified in Section 4.3 of the datasheet. This value assumes standard JEDEC 2-layer board conditions and confirms suitability for industrial ambient temperatures without forced airflow.

How does the 3-state output behavior of SN74AC574NSRE4 differ from standard push-pull outputs?

Unlike push-pull outputs that actively drive high or low, SN74AC574NSRE4's 3-state outputs enter a high-impedance (Hi-Z) state when OE is high-disconnecting Q1–Q8 from the bus. This prevents electrical contention when multiple devices share the same lines, enabling true bidirectional bus architectures without external isolation components.

SN74AC574NSRE4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74AC

Package/Case:: 20-SOIC (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Function:: Standard

Type:: D-Type

Output Type:: Tri-State, Non-Inverted

Number of Elements:: 1

Number of Bits per Element:: 8

Clock Frequency:: 153 MHz

Max Propagation Delay @ V, Max CL:: 9.5ns @ 5V, 50pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 24mA, 24mA

Voltage - Supply:: 2V ~ 6V

Current - Quiescent (Iq):: 4 µA

Input Capacitance:: 4.5 pF

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SO

SN74AC574NSRE4 FAQ

1.How can I place an order for SN74AC574NSRE4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74AC574NSRE4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SN74AC574NSRE4 reliable?

The price and inventory of SN74AC574NSRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC574NSRE4 is usually 5 days.

3.What payment methods are accepted for SN74AC574NSRE4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC574NSRE4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74AC574NSRE4?

SN74AC574NSRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74AC574NSRE4 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SN74AC574NSRE4?

For technical support, including SN74AC574NSRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC574NSRE4 requirements.

6.How does Aetrix verify that SN74AC574NSRE4 is sourced from the original manufacturer or authorized distributors?

All SN74AC574NSRE4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74AC574NSRE4 meets industry standards.

7.What is the process for return or replacement of SN74AC574NSRE4?

All SN74AC574NSRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC574NSRE4, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SN74AC574NSRE4 part is unused and in its original packaging.

Return procedure for SN74AC574NSRE4:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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