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

Texas Instruments SN74ACT534DW

Name: SN74ACT534DW
Brand: Texas Instruments
SKU: SN74ACT534DW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74ACT534DW

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: SN74ACT534DW.pdf

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

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Product details

Overview

SN74ACT534DW from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state inverting outputs, designed for bus interface applications requiring high drive strength and low propagation delay. It operates from 4.5 V to 5.5 V, delivers 24 mA output drive, achieves 10.5 ns max t_PHL at 5 V, and supports TTL-compatible inputs. It is used in bidirectional bus drivers and I/O port buffering in industrial control backplanes.

For engineers reviewing the SN74ACT534DW datasheet, SN74ACT534DW pinout, SN74ACT534DW application, or SN74ACT534DW equivalent, this page provides verified functional specifications, SOIC-20 package details, timing behavior under 5 V operation, and validated alternatives for bus-interface logic replacement.

Technical Context

The SN74ACT534DW implements eight independent D-type latches triggered on the positive clock edge, with each Q output delivering the logical complement of its corresponding D input. Its 3-state output-enable (OE) control operates independently of internal latch state, allowing data retention during high-impedance output mode.

It features TTL-voltage-compatible inputs (V_IL = 0.8 V, V_IH = 2 V), rail-to-rail output swing (V_OL = 0.44 V @ 24 mA, V_OH = 3.76 V @ –24 mA), and robust absolute ratings (V_CC up to 7 V, VI up to V_CC + 0.5 V). Thermal resistance θ_JA is 58°C/W in the DW package.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL/CMOS systems and tolerance against supply ripple.
Max Propagation Delay	10.5 ns (t_PHL, V_CC = 5 V) - Enables reliable operation up to 85 MHz clock frequency in synchronous bus designs.
Output Drive	±24 mA - Sufficient to directly drive heavily loaded PCB traces or multiple CMOS inputs without external buffers.
Input Compatibility	TTL-voltage compatible (V_IH ≥ 2 V, V_IL ≤ 0.8 V) - Interoperates seamlessly with legacy 74LS and 74F logic families.
3-State Leakage	±2.5 µA (I_OZ, V_CC = 5.5 V) - Minimizes bus leakage current when outputs are disabled, critical for low-power standby modes.
Setup/Hold Times	t_su = 4 ns, t_h = 1.5 ns (V_CC = 5 V) - Supports tight timing margins in high-speed register file or pipeline stage implementations.

Pinout & Package

SN74ACT534DW uses a 20-pin SOIC (DW) package with 7.5 mm body width, 2.65 mm max height, and 1.27 mm lead pitch per JEDEC MS-013. Pin 1 is located at the top-left corner with a beveled edge marking.

Pin/Terminal	Circuit Role	Design Meaning
1	OE (Output Enable)	Active-low control: drives all eight Q outputs into high-impedance when high; enables normal logic states when low.
2–9	1Q–8Q (Outputs)	Inverting outputs: Q_n = NOT(D_n) after CLK↑; tri-stated when OE = high.
10	GND	Ground reference for all internal circuitry and output drivers.
11	V_CC	Positive supply (4.5–5.5 V); powers all logic and output stages.
12–19	1D–8D (Data Inputs)	Asynchronous data inputs sampled on rising CLK edge; TTL-compatible voltage thresholds.
20	CLK	Global clock input; positive-edge sensitive; synchronizes all eight flip-flops simultaneously.

Key Features

Feature	Design Value
Octal D-type with Complementary Outputs	Each Q output is inverted relative to its D input, enabling direct implementation of complemented register banks without external inverters.
Bus-Directed 3-State Control	Single OE pin disables all outputs simultaneously with sub-µA leakage, eliminating need for discrete enable logic in shared-bus architectures.
High-Drive 3-State Outputs	±24 mA drive capability allows direct connection to 50 pF loads or stubbed backplane traces without signal integrity degradation.
Full Parallel Load Capability	All eight D inputs accept new data concurrently on one CLK edge, supporting fast register updates in data acquisition or FIFO interfaces.
Power-Up High-Impedance Safety	OE tied to V_CC via pull-up resistor ensures outputs remain high-Z during power ramp, preventing bus contention at startup.

Applications

Industrial Backplane Bus Driver	Programmable Logic Interface Register
Use Scenario: Bidirectional data transfer between microcontroller and peripheral modules across a 20-cm, 100-pF routed backplane. IC Role / Device Role / Timing Role: Acts as direction-controlled bus transceiver using OE for flow control and CLK for synchronized sampling of incoming data. Use Value: 24 mA drive and 10.5 ns propagation delay ensure clean signal edges and setup compliance at 20 MHz sustained throughput.	Use Scenario: Capturing parallel status signals from field sensors into a CPLD-based control unit with deterministic sampling timing. IC Role / Device Role / Timing Role: Functions as a synchronized input latch bank, capturing eight sensor bits on CLK↑ with guaranteed hold time margin. Use Value: 1.5 ns minimum hold time and TTL-compatible inputs eliminate level-shifting components and reduce BOM count.
Legacy System I/O Port Extension	Test Equipment Digital Pattern Generator
Use Scenario: Adding eight programmable output lines to an aging 8051-based test fixture where space and layer count limit routing complexity. IC Role / Device Role / Timing Role: Provides buffered, 3-state-controlled GPIO expansion with OE enabling safe hot-swap of connected DUTs. Use Value: ±2.5 µA high-Z leakage prevents loading of adjacent signals; SOIC-20 footprint fits legacy 0.1" grid layouts.	Use Scenario: Generating precise, synchronized 8-bit stimulus patterns for IC functional testing with repeatable edge alignment. IC Role / Device Role / Timing Role: Serves as a deterministic pattern register, clocked by system master clock to align all eight outputs within 12.5 ns skew. Use Value: 2 ns max t_PLZ/t_PHZ ensures rapid output disable for glitch-free vector transitions during test sequence changes.

Industrial Backplane Bus Driver

Programmable Logic Interface Register

Use Scenario: Bidirectional data transfer between microcontroller and peripheral modules across a 20-cm, 100-pF routed backplane.

IC Role / Device Role / Timing Role: Acts as direction-controlled bus transceiver using OE for flow control and CLK for synchronized sampling of incoming data.

Use Value: 24 mA drive and 10.5 ns propagation delay ensure clean signal edges and setup compliance at 20 MHz sustained throughput.

Use Scenario: Capturing parallel status signals from field sensors into a CPLD-based control unit with deterministic sampling timing.

IC Role / Device Role / Timing Role: Functions as a synchronized input latch bank, capturing eight sensor bits on CLK↑ with guaranteed hold time margin.

Use Value: 1.5 ns minimum hold time and TTL-compatible inputs eliminate level-shifting components and reduce BOM count.

Legacy System I/O Port Extension

Test Equipment Digital Pattern Generator

Use Scenario: Adding eight programmable output lines to an aging 8051-based test fixture where space and layer count limit routing complexity.

IC Role / Device Role / Timing Role: Provides buffered, 3-state-controlled GPIO expansion with OE enabling safe hot-swap of connected DUTs.

Use Value: ±2.5 µA high-Z leakage prevents loading of adjacent signals; SOIC-20 footprint fits legacy 0.1" grid layouts.

Use Scenario: Generating precise, synchronized 8-bit stimulus patterns for IC functional testing with repeatable edge alignment.

IC Role / Device Role / Timing Role: Serves as a deterministic pattern register, clocked by system master clock to align all eight outputs within 12.5 ns skew.

Use Value: 2 ns max t_PLZ/t_PHZ ensures rapid output disable for glitch-free vector transitions during test sequence changes.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop with 3-state output applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ACT574DW	Non-inverting outputs (Q = D), identical timing, same SOIC-20 package and pinout except Q/D order.	Suitable where complemented outputs are not required; avoids need for external inversion in data path.	Select when system logic expects true (not inverted) registered outputs - no PCB change needed due to pin compatibility.
SN74LVC574APW	3.3 V only (1.65–3.6 V), lower drive (±24 mA), smaller TSSOP-20 package, higher t_pd (19 ns max).	Targeted for modern low-voltage digital systems; incompatible with 5 V buses without level translation.	Choose for 3.3 V domains prioritizing space savings and lower power; requires voltage translation if interfacing with 5 V peripherals.

Compared with SN74ACT534DW, SN74ACT574DW offers identical timing and drive in a pin-compatible form but with true outputs, while SN74LVC574APW trades 5 V compatibility and speed for 3.3 V operation and compact packaging - selection depends on voltage domain and inversion requirement.

Availability

SN74ACT534DW is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy I/O expansion, programmable logic register banks, and test equipment pattern generation requiring stable component supply and long-term obsolescence management.

Supply support for SN74ACT534DW 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 90 years of innovation in industrial, automotive, and communications markets.

The SN74ACT534DW belongs to TI's ACT (Advanced CMOS Technology) logic family, engineered for high-speed 5 V bus interface applications where TTL compatibility, strong drive, and predictable timing are essential.

FAQ

What is the maximum clock frequency supported by the SN74ACT534DW?

The SN74ACT534DW supports a maximum clock frequency of 85 MHz under recommended operating conditions (V_CC = 4.5–5.5 V, T_A = –40°C to 85°C), derived from its minimum clock pulse width (t_w = 3.5 ns high/low) and propagation delay limits. This enables use in high-throughput data capture and bus arbitration circuits where deterministic edge alignment is critical.

Does the SN74ACT534DW require external pull-up resistors on the OE pin?

Yes - to ensure the outputs remain in high-impedance during power-up or power-down, OE should be tied to V_CC through a pull-up resistor. The minimum value depends on the driver's current-sinking capability; TI recommends verifying against the specific driving source's I_OL rating to maintain OE > 2 V during transition periods. This prevents bus contention before system initialization completes.

Can the SN74ACT534DW operate reliably with a 3.3 V supply?

No - the SN74ACT534DW is specified only for 4.5 V to 5.5 V operation. Its input thresholds (V_IH = 2 V min, V_IL = 0.8 V max) and output drive characteristics are optimized for 5 V logic families. Using 3.3 V violates recommended operating conditions and risks incorrect logic levels, increased propagation delay, and potential functional failure. For 3.3 V systems, consider SN74LVC574APW instead.

How does the SN74ACT534DW handle unused inputs?

All unused inputs on the SN74ACT534DW must be held at a valid logic level - either V_CC or GND - to prevent floating nodes that could cause excessive ICC current, erratic switching, or ESD susceptibility. TI's application report SCBA004 explicitly mandates this practice. Leaving inputs unconnected violates absolute maximum ratings and may compromise device reliability in long-term operation.

Is the SN74ACT534DW pin-compatible with the SN74ACT574DW?

Yes - the SN74ACT534DW and SN74ACT574DW share identical SOIC-20 (DW) packaging, pin count, and pin assignments, including CLK, OE, V_CC, GND, and all D/Q terminals. The sole functional difference is output polarity: SN74ACT534DW provides inverted outputs (Q = NOT D), while SN74ACT574DW provides true outputs (Q = D). This allows direct substitution when inversion logic is handled elsewhere in the design.

SN74ACT534DW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ACT

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Bulk

Product Status:: Obsolete

Function:: Standard

Type:: D-Type

Output Type:: Tri-State, Inverted

Number of Elements:: 1

Number of Bits per Element:: 8

Clock Frequency:: 100 MHz

Max Propagation Delay @ V, Max CL:: 11.5ns @ 5V, 50pF

Trigger Type:: Positive Edge

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

Voltage - Supply:: 4.5V ~ 5.5V

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-SOIC

SN74ACT534DW FAQ

1.How can I place an order for SN74ACT534DW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ACT534DW 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 SN74ACT534DW reliable?

The price and inventory of SN74ACT534DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT534DW is usually 5 days.

3.What payment methods are accepted for SN74ACT534DW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT534DW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74ACT534DW?

SN74ACT534DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ACT534DW 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 SN74ACT534DW?

For technical support, including SN74ACT534DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT534DW requirements.

6.How does Aetrix verify that SN74ACT534DW is sourced from the original manufacturer or authorized distributors?

All SN74ACT534DW 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 SN74ACT534DW meets industry standards.

7.What is the process for return or replacement of SN74ACT534DW?

All SN74ACT534DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT534DW, 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 SN74ACT534DW part is unused and in its original packaging.

Return procedure for SN74ACT534DW:

1.Submit a request within 90 days.

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

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