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Texas Instruments SN74ACT534DBR
- Part No.:
- SN74ACT534DBR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ACT534DBR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,422
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Product details
Overview
SN74ACT534DBR 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 SN74ACT534DBR datasheet, SN74ACT534DBR pinout, SN74ACT534DBR application, or SN74ACT534DBR equivalent, this device is selected for bidirectional bus interfacing, I/O port buffering, and register-based data latching where low skew, high drive strength, and controlled output enable timing are critical.
Technical Context
The SN74ACT534DBR implements eight independent D-type flip-flops, each triggered on the rising edge of CLK. Data at the D inputs is latched into Q outputs synchronously, with Q reflecting the logical complement (inverted) of D upon clock transition. OE controls all eight outputs simultaneously, placing them in high-impedance state without affecting internal latch states.
Its ACT logic family ensures 5-V operation with TTL-voltage compatibility, ±24 mA output drive, and input tolerance up to 5.5 V. The device retains data during OE assertion, enabling seamless bus arbitration and hot-swap readiness in multi-master systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures robust operation across industrial-grade 5-V supply tolerances. |
| Max tpd | 10.5 ns at 5 V - Enables reliable operation up to 85 MHz clock frequency in synchronous bus systems. |
| Output Drive | ±24 mA - Sufficient to directly drive PCB traces, backplanes, or capacitive loads >50 pF without external buffers. |
| Input Compatibility | TTL-voltage compatible - Interfaces seamlessly with legacy 74LS/74F logic without level-shifting. |
| 3-State Enable | OE-controlled inversion - Allows bidirectional bus control with no external inverters required. |
| Operating Temp | –40°C to +85°C - Qualified for industrial ambient environments without derating. |
| Package | SSOP-20 (DB) - 0.65 mm pitch, 5.3 mm × 7.2 mm footprint, RoHS-compliant green finish. |
Pinout & Package
SN74ACT534DBR uses a 20-pin SSOP (Shrink Small-Outline Package) with 0.65 mm lead pitch, JEDEC MO-150 compliant, body dimensions 7.2 mm × 5.3 mm × 1.95 mm max height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control: drives all Q outputs to high-impedance when high; enables normal logic states when low. |
| 2–9 | 1Q–8Q | Inverting 3-state outputs - Each reflects complement of corresponding D input after CLK↑; high-Z when OE = high. |
| 10 | GND | Ground reference for logic and power return path. |
| 11 | VCC | Positive supply rail (4.5–5.5 V); powers internal logic and output drivers. |
| 12–19 | 1D–8D | Data inputs - Sampled on rising CLK edge; determine inverted Q output states. |
| 20 | CLK | Clock input - Positive-edge sensitive; synchronizes all eight flip-flops simultaneously. |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type flip-flops | Eight independent, edge-triggered storage elements sharing one clock and OE, enabling compact register file implementation. |
| Inverting 3-state outputs | Eliminates need for external inverters in bus-inversion schemes while retaining high-impedance isolation. |
| 5-V ACT logic family | Guarantees TTL-compatible thresholds, 5.5-V tolerant inputs, and noise margins >0.4 V under worst-case conditions. |
| Parallel load capability | Full 8-bit data capture on single CLK↑ event supports synchronous register updates in microcontroller peripherals. |
| Bus-hold immunity | No external pull-ups required on unused inputs; internal circuitry maintains stable logic levels per TI SCBA004 guidance. |
Applications
| Industrial PLC I/O Module | Legacy Bus Interface Adapter |
|---|---|
|
Use Scenario: Isolating and latching sensor/actuator signals between field-side 24-V logic and 5-V controller bus. IC Role / Device Role / Timing Role: Acts as synchronized input buffer and output driver, translating and timing-critical signal handoff between domains. Use Value: Eliminates discrete gate logic and reduces PCB area by 40% versus dual 74ACT244 + 74ACT374 solution. |
Use Scenario: Interfacing ISA-bus peripherals to modern FPGA-based host controllers requiring 5-V tolerant, high-drive latching. IC Role / Device Role / Timing Role: Provides registered, 3-state bidirectional data path with precise setup/hold timing (tsu = 4 ns, th = 1.5 ns @ 5 V). Use Value: Enables direct connection to 8-bit data bus without level shifters or series resistors due to 5.5-V input tolerance. |
| Test Equipment Digital Pattern Generator | Automated Test Fixture Control |
|
Use Scenario: Generating repeatable, glitch-free stimulus waveforms for IC functional testing using pattern memory. IC Role / Device Role / Timing Role: Functions as output register stage, holding test vectors until clocked onto DUT pins with sub-11-ns skew. Use Value: Achieves deterministic timing margin (tPLH/tPHL ≤ 12.5 ns) essential for <100-MHz vector rate compliance. |
Use Scenario: Controlling relay banks, LED indicators, and solenoid drivers in production-line test jigs. IC Role / Device Role / Timing Role: Serves as isolated output latch with OE-gated drive, allowing safe power-up sequencing and fault-safe shutdown. Use Value: Prevents bus contention during power ramp by enabling OE tie-to-VCC via pullup, ensuring default high-Z state. |
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 3-state outputs; identical timing, voltage, and package. | Used where bus polarity must match input data without inversion. | Select when system-level logic requires true (non-inverted) Q outputs; pinout differs only in output polarity assignment. |
| SN74LVC574APWR | 3.3-V operation (1.65–3.6 V), lower drive (±24 mA), same 20-pin TSSOP package. | Targets mixed-voltage systems with 3.3-V core logic and level-shifted 5-V peripherals. | Choose for lower power and 3.3-V compatibility; not a drop-in replacement due to VCC range mismatch. |
Compared with SN74ACT534DBR, SN74ACT574DBR provides identical timing and drive but non-inverting outputs-ideal for polarity-sensitive buses-while SN74LVC574APWR enables 3.3-V integration at the cost of 5-V incompatibility and reduced noise margin.
Availability
SN74ACT534DBR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy bus interface adapters, and automated test fixture control requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74ACT534DBR 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 and automotive electronics.
The SN74ACT534DBR belongs to TI's ACT advanced CMOS logic family, engineered for high-speed, low-noise 5-V digital interfacing in industrial control, instrumentation, and legacy system upgrades.
FAQ
What is the maximum clock frequency supported by the SN74ACT534DBR?
The SN74ACT534DBR supports a maximum clock frequency of 85 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = –40°C to +85°C), as specified in the timing requirements table. This is derived from the minimum clock pulse width (tw = 3.5 ns) and ensures reliable edge-triggered operation across its full temperature range. The SN74ACT534DBR maintains consistent timing performance without derating in industrial environments.
Does the SN74ACT534DBR require external pull-up resistors on the OE pin?
Yes - to ensure the outputs remain in high-impedance state during power-up or power-down, OE should be tied to VCC through a pull-up resistor. TI recommends sizing based on the driver's current-sinking capability; typical values range from 4.7 kΩ to 10 kΩ. This prevents bus contention before system initialization completes, and the SN74ACT534DBR's OE input is not internally biased.
Can the SN74ACT534DBR drive a 50-pF capacitive load reliably?
Yes - the SN74ACT534DBR is explicitly characterized to drive highly capacitive or low-impedance loads, with guaranteed 24-mA output drive and 10.5-ns max tpd into CL = 50 pF. Its ACT-family output structure ensures fast edge rates and stable transitions even under these conditions, making the SN74ACT534DBR suitable for backplane and long-trace routing without added termination.
Is the SN74ACT534DBR pin-compatible with other packages in the SN74ACT534 family?
No - while functionally identical, the SN74ACT534DBR (SSOP-20) has different mechanical dimensions and lead pitch (0.65 mm) than the SOIC-20 (DW, 1.27 mm pitch) or PDIP-20 (N) variants. Pin numbering and signal mapping are identical across packages, but PCB layout is not interchangeable. The SN74ACT534DBR requires dedicated SSOP-20 land patterns per TI's PW0020A outline.
What is the absolute maximum input voltage rating for the SN74ACT534DBR?
The absolute maximum input voltage rating for the SN74ACT534DBR is –0.5 V to VCC + 0.5 V, with VCC up to 7 V. This means inputs can safely tolerate up to 6.0 V when VCC = 5.5 V - exceeding standard 5-V logic rails and enabling direct interfacing with overvoltage-tolerant sensors or legacy 5.5-V systems without clamping diodes. This specification is confirmed in the Absolute Maximum Ratings table of the SCAS556C datasheet.
SN74ACT534DBR 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
SN74ACT534DBR FAQ
1.How can I place an order for SN74ACT534DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT534DBR 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 SN74ACT534DBR reliable?
The price and inventory of SN74ACT534DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT534DBR is usually 5 days.
3.What payment methods are accepted for SN74ACT534DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT534DBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT534DBR?
SN74ACT534DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT534DBR 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 SN74ACT534DBR?
For technical support, including SN74ACT534DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT534DBR requirements.
6.How does Aetrix verify that SN74ACT534DBR is sourced from the original manufacturer or authorized distributors?
All SN74ACT534DBR 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 SN74ACT534DBR meets industry standards.
7.What is the process for return or replacement of SN74ACT534DBR?
All SN74ACT534DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT534DBR, 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 SN74ACT534DBR part is unused and in its original packaging.
Return procedure for SN74ACT534DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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