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Texas Instruments SN74ACT534DBRE4
- Part No.:
- SN74ACT534DBRE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ACT534DBRE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,210
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Product details
Overview
SN74ACT534DBRE4 from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state inverting outputs, designed for bus interface and register applications operating at 4.5–5.5 V. It delivers 10.5 ns max propagation delay at 5 V, TTL-compatible inputs, and ±24 mA output drive capability-enabling direct connection to capacitive or low-impedance bus lines without external pull-ups.
For engineers reviewing the SN74ACT534DBRE4 datasheet, SN74ACT534DBRE4 pinout, SN74ACT534DBRE4 application, or SN74ACT534DBRE4 equivalent, key selection criteria include its positive-edge clock triggering, independent output-enable control, high-impedance state retention during data loading, and SSOP-20 package compatibility with space-constrained industrial control and I/O expansion designs.
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. The buffered OE input controls all eight outputs simultaneously, placing them in high-impedance (Z) state without affecting internal flip-flop operation-allowing concurrent data retention or update while outputs are disabled.
It operates within –40°C to 85°C ambient temperature, supports 5-V logic levels with TTL-voltage-compatible inputs, and features rail-to-rail output swing (VOH ≥ 3.76 V, VOL ≤ 0.44 V at 5 V/24 mA). Input transition rate is specified at 8 ns/V, and absolute maximum ratings include VI up to VCC + 0.5 V and continuous output current of ±50 mA per pin.
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 in industrial and computing systems. |
| tpd (max) | 10.5 ns at 5 V - enables reliable timing in high-speed synchronous bus interfaces up to 85 MHz clock frequency. |
| IOH/IOL | ±24 mA - provides sufficient drive strength to directly load typical PCB traces and stubs without buffering. |
| tsu / th | 4 ns setup / 1.5 ns hold - defines minimum D-input stability window relative to CLK↑ for deterministic state capture. |
| Output Type | 3-state inverting - allows bidirectional bus sharing and eliminates contention when multiple devices share a common data path. |
| Input Compatibility | TTL-voltage compatible - accepts standard 0.8 V/2.0 V logic thresholds, simplifying integration with legacy 5-V logic families. |
| Package | SSOP-20 (DB) - 0.65 mm pitch, 7.9 × 5.0 mm body, RoHS-compliant, moisture-sensitive level 1 (260°C reflow). |
Pinout & Package
SN74ACT534DBRE4 uses a 20-pin Shrink Small-Outline Package (SSOP-DB), measuring 7.9 mm × 5.0 mm × 1.95 mm with 0.65 mm lead pitch and gull-wing leads. Thermal resistance θJA is 70°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | D1–D8 Data Inputs | Asynchronous parallel data inputs; sampled on CLK↑ rising edge and inverted at corresponding Q outputs. |
| 9 | GND | Ground reference for all internal circuitry and output drivers; must be low-impedance connection. |
| 10 | VCC | Positive supply (4.5–5.5 V); decoupling capacitor required near pin for noise suppression. |
| 11, 12, 13, 14, 15, 16, 17, 18 | Q1–Q8 Outputs | Inverting 3-state outputs; driven low/high or placed in high-Z based on OE and CLK↑ timing. |
| 19 | CLK | Clock input; positive-edge sensitive; requires monotonic rise/fall and meets ∆t/∆v ≤ 8 ns/V spec. |
| 20 | OE | Active-low output enable; asserts high-impedance state when high; no effect on internal flip-flop state. |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type flip-flops with complementary outputs | Each channel inverts D input at Q on CLK↑, enabling compact register implementations without external inverters. |
| Independent 3-state control via OE | Single pin disables all eight outputs to high-Z without disrupting internal latch states-critical for hot-swap and multi-master bus arbitration. |
| TTL-compatible input thresholds | VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V-ensures interoperability with 74LS, 74F, and other legacy 5-V logic families. |
| High-output drive (±24 mA) | Eliminates need for external bus transceivers or pull-up resistors in medium-load applications like backplane I/O buffers. |
| Low propagation delay (10.5 ns max) | Supports 85 MHz system clocks with margin for trace delays and setup/hold timing closure in dense PCB layouts. |
Applications
| Industrial I/O Expansion | Legacy Bus Interface |
|---|---|
Use Scenario: Adding parallel digital I/O to PLC modules or motion controllers using existing 5-V backplane buses. IC Role / Device Role / Timing Role: Acts as an octal output latch and bus driver, synchronizing host CPU writes to peripheral outputs on CLK↑ while isolating bus during OE high. Use Value: Enables deterministic, glitch-free output updates with hardware-level timing control-reducing firmware overhead and eliminating software-induced metastability risks. |
Use Scenario: Interfacing modern microcontrollers to legacy ISA or VME bus peripherals requiring 5-V TTL signaling and tri-state control. IC Role / Device Role / Timing Role: Provides level-shifted, inverted, and bus-isolated D/Q paths between controller and legacy bus, with OE coordinated to bus grant cycles. Use Value: Eliminates discrete inverters and bus buffers, reducing BOM count and layout area while maintaining strict timing compliance with legacy bus specifications. |
| Buffer Register for Data Acquisition | Bidirectional Bus Transceiver Support |
Use Scenario: Capturing parallel ADC output words in high-noise industrial environments where signal integrity depends on controlled edge rates and low skew. IC Role / Device Role / Timing Role: Latches ADC data on CLK↑, then presents it to processor bus only when OE is asserted-decoupling sampling and read cycles. Use Value: Prevents bus contention during conversion, reduces EMI from simultaneous data transitions, and improves acquisition repeatability by fixing sample point timing. |
Use Scenario: Supporting half-duplex communication on shared data buses in test equipment or modular instrumentation chassis. IC Role / Device Role / Timing Role: Functions as one side of a bidirectional data path-driving outputs when enabled, presenting high-Z when receiving, with OE synchronized to direction control. Use Value: Allows single 20-pin IC to replace dual 4-bit transceivers, cutting board space and interconnect complexity while preserving full 8-bit bandwidth. |
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 |
|---|---|---|---|
| SN74ACT574DBR | Non-inverting outputs; identical timing, voltage, and package specs. | Requires inverted logic in downstream logic or software if complemented output behavior is needed. | Select when non-inverted Q outputs align with system-level polarity requirements-no change to clocking or OE control. |
| SN74LVC574APWR | 3.3-V only (1.65–3.6 V), lower drive (±24 mA), same pinout but different VCC/GND placement. | Not suitable for 5-V systems; requires level translation if interfacing with 5-V buses or legacy logic. | Choose only for new 3.3-V designs prioritizing lower power and compatibility with modern MCUs-requires full voltage domain review. |
Compared with SN74ACT534DBRE4, SN74ACT574DBR offers functional equivalence except for output inversion polarity, while SN74LVC574APWR shifts to 3.3-V operation with identical pin count but incompatible supply requirements-making the former a drop-in logic replacement and the latter a voltage-domain redesign candidate.
Availability
SN74ACT534DBRE4 is available at Aetrix Electronics and suitable for industrial I/O expansion, legacy bus interface, and buffer register applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74ACT534DBRE4 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.
SN74ACT534DBRE4 belongs to TI's ACT (Advanced CMOS Technology) logic family-designed for high-speed, low-noise 5-V digital systems requiring robust noise immunity, precise timing, and bus-driving capability without external components.
FAQ
What is the recommended power supply decoupling for SN74ACT534DBRE4?
A 0.1 µF ceramic capacitor must be placed as close as possible to the VCC pin (pin 10) and GND (pin 9) of SN74ACT534DBRE4 to suppress high-frequency switching noise. For systems with multiple SN74ACT534DBRE4 devices or heavy bus loading, add a bulk 4.7 µF tantalum or aluminum electrolytic capacitor per 5–10 ICs on the same 5-V rail. This ensures stable VCC during simultaneous output transitions and prevents ground bounce that could corrupt CLK or OE timing.
Can SN74ACT534DBRE4 operate with a 3.3-V supply?
No, SN74ACT534DBRE4 is not rated for 3.3-V operation. Its absolute minimum VCC is 4.5 V, and recommended operating range is strictly 4.5–5.5 V. Applying 3.3 V will result in undefined logic states, failure to meet timing specifications (e.g., tpd, tsu), and potential output contention. For 3.3-V systems, consider SN74LVC574APWR or SN74AHC574PWR-both pin-compatible alternatives with verified 3.3-V performance.
How does OE affect internal flip-flop operation in SN74ACT534DBRE4?
OE has no effect on internal flip-flop operation in SN74ACT534DBRE4. When OE is high, outputs go to high-impedance (Z), but D inputs remain fully functional and CLK↑ continues to capture new data into the latches. This allows seamless data loading or retention while bus lines are isolated-enabling safe multi-drop bus arbitration and hot-plug readiness without disrupting internal state.
What is the maximum capacitive load SN74ACT534DBRE4 can drive reliably?
SN74ACT534DBRE4 is characterized to drive up to 50 pF loads while maintaining specified tPLH/tPHL (≤12.5 ns) and VOL/VOH margins at 24 mA. For heavier loads (e.g., >70 pF), propagation delay increases and VOL may exceed 0.5 V under worst-case conditions. To maintain timing integrity, limit trace + stub capacitance to ≤40 pF per output, or add series termination if driving long traces or unterminated stubs.
Is SN74ACT534DBRE4 pin-compatible with SN74ACT534DBR or SN74ACT534DBRG4?
Yes, SN74ACT534DBRE4 is fully pin-compatible and functionally identical to SN74ACT534DBR and SN74ACT534DBRG4. All three share the same SSOP-20 (DB) package, identical pinout, electrical specifications, and thermal characteristics. The suffix "E4" denotes TI's green RoHS-compliant finish (CU NIPDAU), while "G4" indicates lead-free finish-both meet Level-1 MSL rating and require no layout changes for substitution.
SN74ACT534DBRE4 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
SN74ACT534DBRE4 FAQ
1.How can I place an order for SN74ACT534DBRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT534DBRE4 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 SN74ACT534DBRE4 reliable?
The price and inventory of SN74ACT534DBRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT534DBRE4 is usually 5 days.
3.What payment methods are accepted for SN74ACT534DBRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT534DBRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT534DBRE4?
SN74ACT534DBRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT534DBRE4 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 SN74ACT534DBRE4?
For technical support, including SN74ACT534DBRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT534DBRE4 requirements.
6.How does Aetrix verify that SN74ACT534DBRE4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT534DBRE4 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 SN74ACT534DBRE4 meets industry standards.
7.What is the process for return or replacement of SN74ACT534DBRE4?
All SN74ACT534DBRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT534DBRE4, 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 SN74ACT534DBRE4 part is unused and in its original packaging.
Return procedure for SN74ACT534DBRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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