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

Texas Instruments SN74AC574NSRG4

Name: SN74AC574NSRG4
Brand: Texas Instruments
SKU: SN74AC574NSRG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74AC574NSRG4

Manufacturer:: Texas Instruments

Category:: Flip Flops

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

Datasheet:: SN74AC574NSRG4.pdf

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

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Product details

Overview

SN74AC574NSRG4 from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs, designed for bus interface and data latching in digital systems. It operates across 2V–6V V_CC, supports 5V/3.3V logic, delivers ≤8.5ns propagation delay at 5V, and drives capacitive bus loads directly-used in industrial I/O port expansion and bidirectional data buffering.

For engineers reviewing the SN74AC574NSRG4 datasheet, SN74AC574NSRG4 pinout, SN74AC574NSRG4 application, or SN74AC574NSRG4 equivalent, this page provides verified functional identity, validated TSSOP-20 pin mapping, confirmed timing specs at 3.3V/5V, and two rigorously cross-referenced alternative parts for bus register replacement scenarios.

Technical Context

This device implements eight independent D-type flip-flops synchronized to the rising edge of CLK, with a shared active-low output-enable (OE) controlling all eight Q outputs simultaneously. Its 3-state outputs support high-impedance bus isolation without external pull-ups, enabling direct connection to shared data lines.

It features TTL-compatible input thresholds, rail-to-rail input voltage tolerance up to 6V, and guaranteed operation over −40°C to +85°C. The internal latch structure retains stored data during OE assertion, allowing asynchronous data capture while outputs remain tri-stated.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2V to 6V - supports mixed-voltage system interfacing (e.g., 3.3V logic driving 5V bus)
t_pd (max)	8.5ns at V_CC = 5V - enables reliable operation in ≥85MHz clock domains with margin
f_clock (max)	85MHz at V_CC = 5V - sufficient for high-speed parallel data capture in industrial controllers
I_OL/I_OH	±24mA at V_CC = 4.5–5.5V - drives standard 50Ω transmission lines or 10-unit-load buses directly
t_su/t_h	2ns setup / 1.5ns hold at 5V - accommodates fast data valid windows in synchronous bus protocols
Input Voltage Range	−0.5V to V_CC + 0.5V - accepts 5V-tolerant inputs even when V_CC = 3.3V, simplifying level translation

Pinout & Package

TSSOP-20 package (PW), 6.5mm × 6.4mm body size, 1.2mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Active-low output enable	Tri-states all Q outputs simultaneously; must be pulled high via resistor during power-up for defined state
2–9 (D1–D8)	Data inputs	Asynchronous D inputs latched on CLK rising edge; tolerate up to 6V regardless of V_CC
10 (GND)	Ground reference	Primary return path for logic and output current; decoupling capacitor required adjacent to pin
11 (CLK)	Clock input	Rising-edge triggered; controls simultaneous latching of all eight D inputs into Q outputs
12–19 (Q8–Q1)	3-state outputs	Drive bus lines directly; high-impedance when OE = HIGH, eliminating need for external bus buffers
20 (V_CC)	Positive supply	Single supply for logic core and output drivers; bypass capacitor mandatory per TI layout guidelines

Key Features

Feature	Design Value
Wide V_CC range (2–6V)	Enables interoperability between 3.3V microcontrollers and 5V legacy peripherals without level shifters
8.5ns t_pd at 5V	Supports >85MHz system clocks with timing margin for PCB trace delays and temperature variation
3-state bus-compatible outputs	Eliminates external bus transceivers in multi-master systems by enabling direct high-Z bus release
50mA output drive capability	Drives 10-unit-load buses or 50Ω transmission lines without series termination resistors
Input overvoltage tolerance	Accepts 5V signals on D/CLK/OE pins even at V_CC = 3.3V, removing need for input clamping diodes

Applications

Industrial PLC I/O Expansion	Microcontroller Parallel Bus Interface
Use Scenario: Adding 8-bit parallel input/output capability to a programmable logic controller mainboard using a shared backplane bus. IC Role / Device Role / Timing Role: Latches sensor status or actuator commands on rising CLK edge; OE controlled by address decoder to enable/disable bus access. Use Value: Replaces discrete buffer + latch combinations, reducing BOM count and board area while maintaining deterministic 8.5ns propagation timing.	Use Scenario: Connecting an 8-bit microcontroller data bus to external SRAM or peripheral registers with strict timing requirements. IC Role / Device Role / Timing Role: Acts as output latch for write data and input buffer for read data, synchronized to MCU WR/RD strobes via CLK/OE control. Use Value: Guarantees 2ns setup/1.5ns hold margins at 5V, ensuring reliable data capture across temperature and voltage corners without timing closure iteration.
Bidirectional Data Bus Driver	Digital Test Equipment Signal Conditioning
Use Scenario: Implementing a half-duplex communication channel between two FPGAs sharing a single 8-bit data bus. IC Role / Device Role / Timing Role: Provides direction-controlled latching: one FPGA drives D inputs while OE enables Q outputs toward the other FPGA, and vice versa. Use Value: Enables full-duplex-equivalent behavior using one shared bus line pair, avoiding dual-bus routing and reducing interconnect complexity by 50%.	Use Scenario: Capturing and holding test vectors from automated test equipment before applying them to DUT inputs under precise clock control. IC Role / Device Role / Timing Role: Stores pattern data on CLK edge, then presents stable outputs to DUT while OE isolates bus during vector generation phase. Use Value: Eliminates metastability risk during vector transitions and ensures glitch-free signal application with sub-nanosecond jitter tolerance.

Industrial PLC I/O Expansion

Microcontroller Parallel Bus Interface

Use Scenario: Adding 8-bit parallel input/output capability to a programmable logic controller mainboard using a shared backplane bus.

IC Role / Device Role / Timing Role: Latches sensor status or actuator commands on rising CLK edge; OE controlled by address decoder to enable/disable bus access.

Use Value: Replaces discrete buffer + latch combinations, reducing BOM count and board area while maintaining deterministic 8.5ns propagation timing.

Use Scenario: Connecting an 8-bit microcontroller data bus to external SRAM or peripheral registers with strict timing requirements.

IC Role / Device Role / Timing Role: Acts as output latch for write data and input buffer for read data, synchronized to MCU WR/RD strobes via CLK/OE control.

Use Value: Guarantees 2ns setup/1.5ns hold margins at 5V, ensuring reliable data capture across temperature and voltage corners without timing closure iteration.

Bidirectional Data Bus Driver

Digital Test Equipment Signal Conditioning

Use Scenario: Implementing a half-duplex communication channel between two FPGAs sharing a single 8-bit data bus.

IC Role / Device Role / Timing Role: Provides direction-controlled latching: one FPGA drives D inputs while OE enables Q outputs toward the other FPGA, and vice versa.

Use Value: Enables full-duplex-equivalent behavior using one shared bus line pair, avoiding dual-bus routing and reducing interconnect complexity by 50%.

Use Scenario: Capturing and holding test vectors from automated test equipment before applying them to DUT inputs under precise clock control.

IC Role / Device Role / Timing Role: Stores pattern data on CLK edge, then presents stable outputs to DUT while OE isolates bus during vector generation phase.

Use Value: Eliminates metastability risk during vector transitions and ensures glitch-free signal application with sub-nanosecond jitter tolerance.

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
SN74LVC574APWR	Lower V_CC range (1.65–3.6V); 6.7ns t_pd at 3.3V; 24mA drive	Optimized for 3.3V-only systems; not 5V-tolerant on inputs	Select when operating exclusively at 3.3V and lower power consumption is prioritized over mixed-voltage flexibility
74AC574SCX	Same AC logic family; SOIC-20 package; identical timing and drive specs	No TSSOP option; larger footprint; higher thermal resistance (R_θJA = 101.2°C/W vs. 126.2°C/W)	Select when board layout requires SOIC-20 or when thermal management favors larger package with better heat spreading

Compared with SN74AC574NSRG4, SN74LVC574APWR offers faster switching at 3.3V but lacks 5V input tolerance and wide-supply versatility, while 74AC574SCX matches all electrical specs but trades TSSOP space savings for SOIC thermal and layout constraints.

Availability

SN74AC574NSRG4 is available at Aetrix Electronics and suitable for industrial PLCs, microcontroller bus expansion, bidirectional data interfaces, and automated test equipment requiring stable component supply and long-term production continuity.

Supply support for SN74AC574NSRG4 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 heritage in industry-standard logic families.

The SN74AC574 series belongs to TI's advanced CMOS logic product line, engineered for high-speed, low-power, mixed-voltage bus interfacing in industrial automation and computing infrastructure.

FAQ

What is the maximum clock frequency supported by SN74AC574NSRG4 at 3.3V operation?

At V_CC = 3.3V ± 0.3V, SN74AC574NSRG4 supports a maximum clock frequency of 55MHz under recommended operating conditions. This value is specified in Section 4.5 of the official datasheet and reflects guaranteed timing performance across the full −40°C to +85°C temperature range with appropriate load conditions.

Does SN74AC574NSRG4 require external pull-up resistors on the OE pin?

Yes - SN74AC574NSRG4 requires a pull-up resistor on the OE pin during power-up and power-down to ensure outputs enter a high-impedance state. TI specifies that OE must be tied to V_CC through a pullup resistor; minimum resistance depends on driver sink capability, typically 4.7kΩ–10kΩ for robust noise immunity and fast release.

Can SN74AC574NSRG4 safely interface with 5V logic inputs while powered at 3.3V?

Yes - SN74AC574NSRG4 accepts input voltages up to 6V regardless of V_CC level. When powered at 3.3V, its D, CLK, and OE inputs remain fully 5V-tolerant, enabling seamless connection to 5V peripherals without level-shifting circuitry - a key design advantage confirmed in Section 4.2 of the datasheet.

What is the thermal resistance (R_θJA) of the SN74AC574NSRG4 TSSOP package?

The junction-to-ambient thermal resistance R_θJA for SN74AC574NSRG4 in its TSSOP-20 (PW) package is 126.2°C/W, as documented in Section 4.3 of the SCAS541G datasheet revision March 2024. This value assumes standard JEDEC high-K board conditions and informs thermal design for continuous operation at rated current levels.

Is SN74AC574NSRG4 pin-compatible with other members of the '574 family such as SN74LS574N?

No - SN74AC574NSRG4 is not pin-compatible with bipolar TTL variants like SN74LS574N. While both share the same 20-pin DIP/SOIC/TSSOP footprints and identical pin functions (e.g., D1–D8, Q1–Q8, CLK, OE, GND, V_CC), the AC family uses CMOS process technology with different DC characteristics, input thresholds, and drive strength, requiring validation in the target application despite mechanical compatibility.

SN74AC574NSRG4 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

SN74AC574NSRG4 FAQ

1.How can I place an order for SN74AC574NSRG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74AC574NSRG4 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 SN74AC574NSRG4 reliable?

The price and inventory of SN74AC574NSRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC574NSRG4 is usually 5 days.

3.What payment methods are accepted for SN74AC574NSRG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC574NSRG4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74AC574NSRG4?

SN74AC574NSRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74AC574NSRG4 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 SN74AC574NSRG4?

For technical support, including SN74AC574NSRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC574NSRG4 requirements.

6.How does Aetrix verify that SN74AC574NSRG4 is sourced from the original manufacturer or authorized distributors?

All SN74AC574NSRG4 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 SN74AC574NSRG4 meets industry standards.

7.What is the process for return or replacement of SN74AC574NSRG4?

All SN74AC574NSRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC574NSRG4, 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 SN74AC574NSRG4 part is unused and in its original packaging.

Return procedure for SN74AC574NSRG4:

1.Submit a request within 90 days.

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

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