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

Texas Instruments SN74AC534DW

Name: SN74AC534DW
Brand: Texas Instruments
SKU: SN74AC534DW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74AC534DW

Manufacturer:: Texas Instruments

Category:: Flip Flops

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

Datasheet:: SN74AC534DW.pdf

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

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Product details

Overview

SN74AC534DW from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state inverting outputs, designed for bus interface and register applications. It operates across 2V–6V V_CC, supports 5V logic systems, delivers ≤11ns propagation delay at 5V, and features independent output-enable (OE) control for high-impedance bus isolation - used in industrial I/O port buffering and bidirectional data latching.

For engineers reviewing the SN74AC534DW datasheet, SN74AC534DW pinout, SN74AC534DW application, or SN74AC534DW equivalent, this page provides verified functional identity, SOIC-20 package mapping, timing behavior at 3.3V/5V, 3-state drive capability, and validated alternative options for register/buffer replacement in legacy 5V digital systems.

Technical Context

This device implements eight synchronous D-type latches triggered on the rising edge of CLK, with each Q output inverted relative to its D input. The OE pin enables/disables all eight outputs simultaneously without affecting internal state retention or clock/data sampling behavior.

It uses AC-series CMOS technology with TTL-compatible input thresholds, rail-to-rail input voltage tolerance (up to 6V), and 3-state outputs capable of sinking or sourcing ±24mA at 5V - enabling direct connection to capacitive bus loads without external pull-ups or level shifters.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2V to 6V - supports mixed-voltage system interfacing and 5V legacy designs without level translation.
t_pd (max)	11ns at V_CC = 5V - enables reliable operation up to 140MHz clock frequency in synchronous register chains.
I_OL/I_OH	±24mA at 5V - drives standard 50pF bus loads directly; eliminates need for external buffer stages.
t_su/t_h	3.5ns setup / 1ns hold at 5V - tight timing margins allow integration into high-speed control logic with minimal skew management.
Operating Temp	−40°C to +85°C - qualified for industrial temperature range operation in embedded controllers and PLC modules.
C_i	4.5pF - low input capacitance minimizes loading on preceding drivers and preserves signal integrity in dense PCB layouts.
C_pd	40pF - power dissipation capacitance enables accurate dynamic power estimation at 1MHz switching frequency.

Pinout & Package

SN74AC534DW is housed in a 20-pin SOIC (DW) package measuring 12.80mm × 10.3mm (body: 12.80mm × 7.50mm), with gull-wing leads and standard JEDEC MS-013 outline. Pin 1 is located at the top-left corner adjacent to the index notch.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Output Enable (active-low)	Asserting low places all Q outputs in high-impedance state; does not affect internal flip-flop state or clock sampling.
2–9, 12, 15–19 (Q1–Q8)	Inverting 3-state outputs	Each Q is complement of corresponding D input; tri-stated when OE = high; sinks/sourses ±24mA at 5V.
3–4, 7–8, 13–14, 17–18 (D1–D8)	Data inputs	Accept voltages up to 6V regardless of V_CC; TTL-compatible thresholds ensure robust noise margin in 5V systems.
11 (CLK)	Clock input	Rising-edge triggered; accepts fast transitions (≤8ns/V slew rate); synchronizes all eight D-to-Q transfers simultaneously.
10 (GND)	Ground reference	Primary return path for output current and internal logic; requires local 0.1µF bypass capacitor per TI layout guidelines.
20 (V_CC)	Power supply	Supplies core logic and output drivers; must be decoupled with 0.1µF ceramic capacitor placed within 1cm of pin.

Key Features

Feature	Design Value
Wide V_CC range (2V–6V)	Enables interoperability between 3.3V and 5V subsystems without level-shifting circuitry.
3-state inverting outputs	Allows bidirectional bus sharing among multiple SN74AC534DW devices or other compatible drivers on same trace.
Full parallel access	All eight D inputs sampled and latched simultaneously on CLK↑ - ideal for byte-wide register loading.
Input voltage tolerance to 6V	Permits direct connection to higher-voltage control signals (e.g., 5V microcontroller GPIO) even when V_CC = 3.3V.
Low input capacitance (4.5pF)	Reduces capacitive loading on upstream drivers, preserving signal rise/fall times in high-speed data paths.

Applications

Industrial I/O Port Buffering	Legacy Microcontroller Bus Interface
Use Scenario: Isolating and latching parallel I/O lines between a programmable logic controller (PLC) CPU and field-device sensor/actuator modules. IC Role / Device Role / Timing Role: Acts as an octal latch with 3-state outputs to buffer bidirectional data bus lines, synchronized to system clock edges. Use Value: Enables deterministic read/write timing via single CLK edge; OE allows hot-swap-safe bus release during firmware updates.	Use Scenario: Extending parallel address/data bus capacity of an 8-bit microcontroller (e.g., 8051 derivative) for memory-mapped peripherals. IC Role / Device Role / Timing Role: Functions as a byte-wide output register that captures microcontroller port writes and holds stable values until next update. Use Value: Eliminates need for discrete transistors or additional logic gates; 11ns t_pd ensures compatibility with sub-100ns bus cycles.
Programmable Logic Register Bank	Test Equipment Signal Conditioning
Use Scenario: Implementing configurable register banks in FPGA-based test pattern generators where deterministic setup/hold timing is critical. IC Role / Device Role / Timing Role: Provides edge-triggered storage with independent OE control for gated output enable during test sequence transitions. Use Value: Supports precise timing alignment across 8-bit channels; 1ns hold time simplifies PCB routing for matched-length traces.	Use Scenario: Latching calibration coefficients or configuration bits in automated test equipment (ATE) channel modules operating at 5V. IC Role / Device Role / Timing Role: Serves as a non-inverting data latch (via external inversion) with 3-state outputs for isolated signal routing between analog front-end and digital control logic. Use Value: 6V-tolerant inputs accept 5V logic from host controller while V_CC = 5V; ±24mA drive handles moderate capacitive loads on backplane traces.

Industrial I/O Port Buffering

Legacy Microcontroller Bus Interface

Use Scenario: Isolating and latching parallel I/O lines between a programmable logic controller (PLC) CPU and field-device sensor/actuator modules.

IC Role / Device Role / Timing Role: Acts as an octal latch with 3-state outputs to buffer bidirectional data bus lines, synchronized to system clock edges.

Use Value: Enables deterministic read/write timing via single CLK edge; OE allows hot-swap-safe bus release during firmware updates.

Use Scenario: Extending parallel address/data bus capacity of an 8-bit microcontroller (e.g., 8051 derivative) for memory-mapped peripherals.

IC Role / Device Role / Timing Role: Functions as a byte-wide output register that captures microcontroller port writes and holds stable values until next update.

Use Value: Eliminates need for discrete transistors or additional logic gates; 11ns t_pd ensures compatibility with sub-100ns bus cycles.

Programmable Logic Register Bank

Test Equipment Signal Conditioning

Use Scenario: Implementing configurable register banks in FPGA-based test pattern generators where deterministic setup/hold timing is critical.

IC Role / Device Role / Timing Role: Provides edge-triggered storage with independent OE control for gated output enable during test sequence transitions.

Use Value: Supports precise timing alignment across 8-bit channels; 1ns hold time simplifies PCB routing for matched-length traces.

Use Scenario: Latching calibration coefficients or configuration bits in automated test equipment (ATE) channel modules operating at 5V.

IC Role / Device Role / Timing Role: Serves as a non-inverting data latch (via external inversion) with 3-state outputs for isolated signal routing between analog front-end and digital control logic.

Use Value: 6V-tolerant inputs accept 5V logic from host controller while V_CC = 5V; ±24mA drive handles moderate capacitive loads on backplane traces.

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
SN74ACT534DW	ACT-series variant with faster t_pd (≤9ns at 5V) but tighter V_CC range (4.5V–5.5V); higher drive strength (±24mA) maintained.	Requires strict 5V supply; unsuitable for mixed-voltage or 3.3V-only systems where SN74AC534DW operates reliably.	Select when maximum speed is required and supply regulation is stable at 5V ±5%.
SN74LS534N	LS-TTL version with slower t_pd (~25ns), lower drive (−15mA/+10mA), and narrower V_CC (4.75V–5.25V); incompatible input thresholds.	Consumes more power; lacks 3.3V compatibility and 6V-tolerant inputs; obsolete in new designs due to higher static current.	Only consider for drop-in replacement in legacy LS-TTL boards where AC-series timing or voltage flexibility is unnecessary.

Compared with SN74ACT534DW and SN74LS534N, the SN74AC534DW uniquely balances wide supply range (2V–6V), 6V-tolerant inputs, and 11ns speed - making it the preferred choice for industrial upgrades requiring backward compatibility and future-proof voltage scalability.

Availability

SN74AC534DW is available at Aetrix Electronics and suitable for industrial I/O buffering, legacy microcontroller bus expansion, programmable logic register banks, and test equipment signal conditioning requiring stable component supply across extended product lifecycles.

Supply support for SN74AC534DW 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 SN74AC534DW belongs to TI's AC-series advanced CMOS logic family, engineered for high-speed, low-power, and wide-supply-voltage operation in industrial control and legacy system upgrades.

FAQ

What is the maximum clock frequency supported by the SN74AC534DW?

The SN74AC534DW supports a maximum clock frequency of 140MHz at V_CC = 5V ±0.5V under recommended operating conditions. This is derived from minimum pulse width (3.5ns high/low) and verified switching characteristics in the official datasheet. The SN74AC534DW achieves this performance while maintaining 3.5ns setup and 1ns hold time margins, ensuring reliable operation in high-speed synchronous systems.

Does the SN74AC534DW support 3.3V operation?

Yes, the SN74AC534DW fully supports 3.3V operation with guaranteed performance: V_CC range includes 3.3V (2V–6V), and timing parameters such as t_pd ≤14ns, f_max = 70MHz, and t_su/t_h = 5ns/1ns are specified at V_CC = 3.3V ±0.3V. Its 6V-tolerant inputs also allow interfacing with 5V signals while powered from 3.3V - a key advantage of the AC-series over older TTL families.

Is the SN74AC534DW pin-compatible with other octal D-type flip-flops in SOIC-20?

The SN74AC534DW shares identical SOIC-20 (DW) pinout and function mapping with SN74AC534DBR (SSOP), SN74AC534NSR (SOP), and SN74AC534PWR (TSSOP) variants - all follow the same pin configuration shown in Figure 3-1 and Table 3-1 of the datasheet. However, it is not pin-compatible with LS- or F-series equivalents like SN74LS534N due to differing OE polarity and output inversion logic.

What is the purpose of the OE pin on the SN74AC534DW?

The OE (Output Enable) pin on the SN74AC534DW is an active-low control that places all eight Q outputs in high-impedance state when asserted high, without affecting internal flip-flop state or clock/data sampling. This enables safe bus sharing, hot-swap isolation, and multi-drop configurations. TI recommends tying OE to V_CC via a pull-up resistor during power-up to ensure defined initial output state - a requirement explicitly stated in Section 6.1 of the SN74AC534DW datasheet.

How does the SN74AC534DW handle input voltage levels above V_CC?

The SN74AC534DW accepts input voltages up to 6V regardless of V_CC level - a documented feature confirmed in Section 1 (Features) and Section 4.1 (Absolute Maximum Ratings). This 6V-tolerant input capability allows direct interfacing with 5V microcontrollers or sensors while V_CC = 3.3V, eliminating level shifters. Input clamp current is limited to ±20mA, and operation remains valid as long as VI stays within −0.5V to V_CC + 0.5V per Section 4.1.

SN74AC534DW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74AC

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:: 150 MHz

Max Propagation Delay @ V, Max CL:: 10.5ns @ 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-SOIC

SN74AC534DW FAQ

1.How can I place an order for SN74AC534DW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74AC534DW 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 SN74AC534DW reliable?

The price and inventory of SN74AC534DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC534DW is usually 5 days.

3.What payment methods are accepted for SN74AC534DW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC534DW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74AC534DW?

SN74AC534DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74AC534DW 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 SN74AC534DW?

For technical support, including SN74AC534DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC534DW requirements.

6.How does Aetrix verify that SN74AC534DW is sourced from the original manufacturer or authorized distributors?

All SN74AC534DW 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 SN74AC534DW meets industry standards.

7.What is the process for return or replacement of SN74AC534DW?

All SN74AC534DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC534DW, 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 SN74AC534DW part is unused and in its original packaging.

Return procedure for SN74AC534DW:

1.Submit a request within 90 days.

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

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