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Texas Instruments SN74ACT534DBRG4
- Part No.:
- SN74ACT534DBRG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ACT534DBRG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,099
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Product details
Overview
SN74ACT534DBRG4 from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state inverting outputs, designed for high-capacitance bus driving in digital systems. It operates from 4.5 V to 5.5 V, delivers 10.5 ns max propagation delay at 5 V, accepts TTL-compatible inputs, and supports parallel data loading via positive-edge clocking.
For engineers reviewing the SN74ACT534DBRG4 datasheet, SN74ACT534DBRG4 pinout, SN74ACT534DBRG4 application, or SN74ACT534DBRG4 equivalent, key selection criteria include its 20-pin SSOP package, 3-state output control (OE), inverting Q outputs, ±24 mA drive capability, and compatibility with 5-V logic buses requiring bidirectional buffering or register staging.
Technical Context
This device implements eight independent D-type latches synchronized to the rising edge of CLK, with each Q output delivering the logical complement of its corresponding D input. Internal circuitry isolates OE control from flip-flop state retention-data can be updated or held while outputs remain in high-impedance mode.
The 3-state outputs are optimized for direct connection to shared bus lines without external pull-ups or interface components. Input voltage tolerance up to 5.5 V enables safe interfacing with mixed-voltage subsystems, and the design meets ACT-series speed-power trade-offs for industrial-grade 5-V CMOS applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard 5-V supply tolerances and brown-out margins. |
| Max tpd | 10.5 ns at 5 V - Enables reliable operation in high-speed digital systems up to 85 MHz clock frequency. |
| Output Drive | ±24 mA - Sufficient to drive typical PCB traces and stub-loaded buses without signal integrity degradation. |
| Input Compatibility | TTL-voltage compatible - Interfaces directly with legacy 5-V TTL logic without level-shifting circuitry. |
| 3-State Control | Active-low OE input - Places all eight outputs in high-impedance state independently of clock or data activity. |
| Logic Family | ACT (Advanced CMOS Technology) - Delivers bipolar-like speed with CMOS power efficiency and noise immunity. |
Pinout & Package
SN74ACT534DBRG4 is housed in a 20-pin SSOP (Shrink Small-Outline Package), DB package type, with 0.65 mm lead pitch, 7.5 mm body width, and 1.2 mm max height per JEDEC MO-150.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 13, 14, 15, 16, 17, 18, 19, 20 | Data (D1–D8), Q (Q1–Q8), CLK, OE, VCC, GND | Standard assignment per TI SCAS556C: Pins 1–8 = D1–D8; 9 = GND; 10 = VCC; 11–18 = Q1–Q8; 19 = CLK; 20 = OE. |
| OE (Pin 20) | Output Enable | Active-low control: drives all Q outputs to high-impedance when high; enables normal logic states when low. |
| CLK (Pin 19) | Clock Input | Positive-edge-triggered - captures D-input states only on rising transition; no internal synchronization delay. |
| Q1–Q8 (Pins 11–18) | Inverting Outputs | Each Qn = NOT(Dn) after CLK↑ - provides complementary latched data ideal for bus inversion or differential signaling paths. |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type flip-flops | Eight independent edge-triggered storage elements enable compact register file implementation in space-constrained layouts. |
| 3-State inverting outputs | Eliminates need for external bus transceivers or pull-up resistors when interfacing with shared data/address buses. |
| 10.5 ns max propagation delay | Supports synchronous timing budgets in 85 MHz digital systems with margin for trace delays and setup/hold windows. |
| TTL-compatible inputs | Accepts standard 5-V TTL logic thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), simplifying integration with legacy controller interfaces. |
| Wide supply range (4.5–5.5 V) | Accommodates nominal 5-V rails with ±10% variation, reducing need for precision regulation in industrial power domains. |
Applications
| Industrial Bus Interface | Microcontroller I/O Expansion |
|---|---|
Use Scenario: Isolating and buffering address/data lines between a PLC CPU and modular I/O backplane. IC Role / Device Role / Timing Role: Acts as a registered bus driver that latches command data on CLK edge and presents it to downstream modules via 3-state outputs. Use Value: Prevents bus contention during hot-swap events and ensures deterministic timing alignment across distributed I/O nodes. | Use Scenario: Extending GPIO count of an 8-bit microcontroller for controlling multiple LED banks and sensor readouts. IC Role / Device Role / Timing Role: Functions as an output latch register, holding steady-state drive signals while MCU executes background tasks. Use Value: Offloads real-time GPIO management, enabling consistent LED brightness and sensor sampling intervals without MCU polling overhead. |
| Digital Test Equipment | Legacy System Emulation |
Use Scenario: Generating precise stimulus patterns on a boundary-scan test fixture for ASIC validation. IC Role / Device Role / Timing Role: Serves as a programmable pattern generator stage, synchronizing parallel bit vectors to system clock edges. Use Value: Achieves sub-11 ns timing resolution for setup/hold verification of high-speed digital interfaces under test. | Use Scenario: Replacing obsolete 74F534 in retro-computing hardware restoration projects. IC Role / Device Role / Timing Role: Provides pin- and function-compatible drop-in replacement with identical logic behavior and improved noise immunity. Use Value: Restores full functionality without PCB modification while enhancing reliability in aging equipment environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT574DBR | Non-inverting Q outputs; identical timing, package, and drive specs. | Preferred where bus data must retain polarity (e.g., memory write-through paths). | Select SN74ACT574DBR when non-inverted output logic is required; otherwise SN74ACT534DBRG4 remains optimal for inverted-bus architectures. |
| SN74LVC574APWR | 3.3-V only (1.65–3.6 V); lower drive (±24 mA), same pinout but different voltage domain. | Suitable for mixed-signal systems with 3.3-V controllers and level-shifted 5-V peripherals. | Choose SN74LVC574APWR only in 3.3-V designs; SN74ACT534DBRG4 is mandatory for native 5-V bus integrity and TTL compatibility. |
Compared with SN74ACT574DBR and SN74LVC574APWR, SN74ACT534DBRG4 uniquely combines 5-V operation, TTL input compatibility, and inverting outputs-making it irreplaceable in legacy 5-V bus systems requiring polarity inversion and robust noise margins.
Availability
SN74ACT534DBRG4 is available at Aetrix Electronics and suitable for industrial bus interface, microcontroller I/O expansion, digital test equipment, and legacy system emulation requiring stable component supply and long-term production continuity.
Supply support for SN74ACT534DBRG4 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 for industrial, automotive, and communications markets.
The SN74ACT534 series belongs to TI's Advanced CMOS Logic family, engineered for high-speed, low-power 5-V digital interfacing where bus isolation, timing predictability, and legacy compatibility are critical.
FAQ
What is the logic polarity of the Q outputs on the SN74ACT534DBRG4?
The SN74ACT534DBRG4 features inverting outputs: each Qn pin delivers the logical complement of its corresponding Dn input after the positive clock edge. This behavior is fixed and cannot be disabled or configured. The inverting nature is integral to the device's architecture and is documented in the function table and logic diagram of the SCAS556C datasheet.
Does the SN74ACT534DBRG4 require external pull-up resistors on the OE pin?
Yes - to ensure the outputs enter high-impedance during power-up or power-down, OE (Pin 20) should be tied to VCC through a pull-up resistor. TI recommends sizing the resistor based on the current-sinking capability of the driving source; typical values range from 4.7 kΩ to 10 kΩ. Leaving OE floating risks undefined output states and potential bus contention.
Can the SN74ACT534DBRG4 operate reliably at 3.3 V?
No - the SN74ACT534DBRG4 is specified only for 4.5 V to 5.5 V operation. Its input thresholds, propagation delay, and output drive strength are characterized exclusively within this range. Attempting 3.3-V operation violates recommended conditions and may result in metastability, excessive delay, or failure to meet VOH/VOL specifications. For 3.3-V systems, consider SN74LVC574APWR instead.
How many data bits does the SN74ACT534DBRG4 latch per clock cycle?
The SN74ACT534DBRG4 latches eight independent data bits (D1–D8) simultaneously on each rising edge of the CLK input. All eight flip-flops share the same clock and output-enable signals, enabling true parallel loading of a full byte. This makes SN74ACT534DBRG4 ideal for applications requiring synchronized multi-bit data capture or staging.
Is the SN74ACT534DBRG4 RoHS compliant and what is its moisture sensitivity level?
Yes - SN74ACT534DBRG4 is RoHS compliant with Green (RoHS & no Sb/Br) material content and CU NIPDAU lead finish. Its moisture sensitivity level is rated JEDEC Level-1 with unlimited floor life at ≤30°C/60% RH, meaning it can be mounted without baking or special handling under standard assembly conditions.
SN74ACT534DBRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SSOP
SN74ACT534DBRG4 FAQ
1.How can I place an order for SN74ACT534DBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT534DBRG4 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 SN74ACT534DBRG4 reliable?
The price and inventory of SN74ACT534DBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT534DBRG4 is usually 5 days.
3.What payment methods are accepted for SN74ACT534DBRG4?
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4.How is shipping managed for SN74ACT534DBRG4?
SN74ACT534DBRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT534DBRG4 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 SN74ACT534DBRG4?
For technical support, including SN74ACT534DBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT534DBRG4 requirements.
6.How does Aetrix verify that SN74ACT534DBRG4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT534DBRG4 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 SN74ACT534DBRG4 meets industry standards.
7.What is the process for return or replacement of SN74ACT534DBRG4?
All SN74ACT534DBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT534DBRG4, 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 SN74ACT534DBRG4 part is unused and in its original packaging.
Return procedure for SN74ACT534DBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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