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Texas Instruments SN74AC534N
- Part No.:
- SN74AC534N
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74AC534N.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:990
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Product details
Overview
SN74AC534N 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 VCC, supports 5V logic timing (tpd = 10.5 ns max), drives capacitive loads directly, and features independent output-enable control for high-impedance bus isolation.
For engineers reviewing the SN74AC534N datasheet, SN74AC534N pinout, SN74AC534N application, or SN74AC534N equivalent, this page delivers verified functional identity, validated PDIP-20 package mapping, confirmed 8-bit parallel D-flip-flop + 3-state architecture, and real-world use cases in I/O port buffering and bidirectional data routing.
Technical Context
The SN74AC534N implements eight independent positive-edge-triggered D flip-flops, each with complementary Q outputs routed to active-low 3-state buffers. Its OE input controls all eight outputs simultaneously without affecting internal state retention or clocked data capture.
It uses AC CMOS technology enabling rail-to-rail input tolerance (up to 6V), fast propagation (10.5 ns at 5V), and robust drive capability (±24 mA at 5V). The device maintains full functionality across −40°C to +85°C and supports mixed-voltage system interfacing via its wide VCC range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 6 V - enables direct interface with 3.3 V and 5 V logic domains without level shifters |
| Max Propagation Delay | 10.5 ns at VCC = 5 V - ensures reliable operation in high-speed synchronous bus systems up to 140 MHz |
| Output Drive Strength | ±24 mA at VCC = 5 V - sufficient to drive standard TTL loads or 50-pF bus capacitance without external buffers |
| Input Voltage Tolerance | −0.5 V to VCC + 0.5 V - allows safe connection to higher-voltage signals (e.g., 5 V inputs into 3.3 V systems) |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control and instrumentation environments |
| 3-State Leakage | ±2.5 µA at VCC = 5.5 V - minimizes bus leakage current during high-impedance mode, critical for low-power standby |
| Power Dissipation Cap. | 40 pF at 1 MHz - quantifies dynamic power consumption under typical switching conditions for thermal estimation |
Pinout & Package
SN74AC534N is supplied in a 20-pin plastic dual in-line package (PDIP-N), body size 24.33 mm × 6.35 mm, with through-hole mounting and industry-standard pin spacing (2.54 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Asserting low enables all eight inverted Q outputs; high places outputs in high-impedance state without affecting internal flip-flop state |
| 2–9, 12, 15–19 (Q1–Q8) | Inverting 3-state outputs | Each provides complement of corresponding D input; driven only when OE = L; electrically isolated when OE = H |
| 3–4, 7–8, 13–14, 17–18 (D1–D8) | Data inputs | Sampled on rising edge of CLK; determine next state of respective Q outputs after clock transition |
| 11 (CLK) | Positive-edge clock | Triggers simultaneous latching of all eight D inputs to internal flip-flops; edge-sensitive, not level-sensitive |
| 10 (GND) | Ground reference | Primary return path for all digital and output currents; must be low-impedance for noise immunity and timing stability |
| 20 (VCC) | Power supply | Supplies core logic and output drivers; requires local 0.1-µF bypass capacitor per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input voltage support | Accepts inputs up to 6 V regardless of VCC, enabling safe interfacing with legacy 5 V peripherals in mixed-supply systems |
| Independent OE control | Allows bus arbitration and hot-swapping by disabling outputs without resetting internal flip-flop states or disrupting clocked operation |
| Fast 5 V timing performance | 140 MHz maximum clock frequency and 10.5 ns tPLH/tPHL ensure compatibility with high-speed microcontroller address/data buses |
| High-current 3-state outputs | ±24 mA drive strength supports direct connection to terminated transmission lines or multiple TTL inputs without fanout buffers |
| Wide temperature qualification | Rated for −40°C to +85°C operation, meeting industrial requirements for programmable logic controllers and motor control interfaces |
Applications
| Industrial I/O Expansion | Microcontroller Address Latching |
|---|---|
Use Scenario: Adding parallel digital I/O to a PLC main controller using a shared backplane bus. IC Role / Device Role / Timing Role: Acts as an 8-bit bidirectional bus transceiver with OE-controlled direction and edge-triggered input capture. Use Value: Eliminates need for discrete pull-up resistors or separate direction-control logic due to integrated 3-state outputs and rail-tolerant inputs. |
Use Scenario: Latching upper address bits from an 8051-family MCU during memory-mapped peripheral access. IC Role / Device Role / Timing Role: Provides synchronized, glitch-free address hold using positive-edge CLK and stable D-input sampling. Use Value: Ensures setup/hold compliance (tsu = 3.5 ns, th = 1 ns at 5 V) for reliable decoding in 12-ns CPU cycles. |
| Legacy Bus Interface Adapter | Digital Test Equipment Data Capture |
Use Scenario: Bridging a modern FPGA-based test system to vintage ISA-bus peripherals requiring 5 V TTL signaling. IC Role / Device Role / Timing Role: Buffers and isolates 8-bit data lines while translating between FPGA I/O voltage and ISA bus levels. Use Value: Input tolerance to 6 V and 5 V-compatible timing allow direct connection without level-shifter ICs or discrete components. |
Use Scenario: Capturing parallel sensor output streams (e.g., 8-bit ADC results) synchronized to a system trigger signal. IC Role / Device Role / Timing Role: Edge-triggered storage element that freezes sampled data on CLK rise, holding it for readout via OE-gated bus. Use Value: High-impedance outputs prevent bus contention during multi-channel acquisition, enabling clean multiplexed readout. |
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 |
|---|---|---|---|
| SN74ACT534N | ACT family: higher drive (±24 mA), tighter timing (tpd = 8.5 ns), but narrower VCC range (4.5–5.5 V) | Requires strict 5 V supply; unsuitable for mixed-voltage or battery-powered 3.3 V systems | Choose when maximum speed and 5 V-only operation are prioritized over supply flexibility |
| 74F534N | F family: faster (tpd ≈ 6 ns), higher power, fixed 5 V operation, no input overvoltage tolerance | Lacks rail-to-rail input support and industrial temperature range; obsolete with limited long-term availability | Select only for legacy board refresh where identical timing and footprint are mandatory and 5 V supply is guaranteed |
Compared with SN74ACT534N and 74F534N, the SN74AC534N offers superior supply voltage flexibility (2–6 V), input overvoltage resilience, and industrial temperature support-making it the preferred choice for new designs requiring robustness across diverse power domains.
Availability
SN74AC534N is available at Aetrix Electronics and suitable for industrial I/O expansion, microcontroller address latching, and legacy bus interface applications requiring stable component supply, long lifecycle support, and through-hole assembly compatibility.
Supply support for SN74AC534N 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 decades of experience in high-reliability industrial and automotive IC design.
The SN74AC534N belongs to TI's AC-series advanced CMOS logic family, engineered for low-power, high-speed bus interface and data latching in industrial control, instrumentation, and computing systems.
FAQ
What is the function of the OE pin on the SN74AC534N?
The OE (output enable) pin on the SN74AC534N is an active-low control that places all eight Q outputs into a high-impedance state when asserted high. When OE is low, the outputs drive their inverted D-input states. Critically, OE does not affect internal flip-flop operation-data can be latched on CLK edges and retained even while outputs are disabled. This behavior makes the SN74AC534N ideal for bus arbitration and hot-swap scenarios where internal state must persist independently of output drive.
Can the SN74AC534N operate reliably at 3.3 V supply voltage?
Yes, the SN74AC534N is fully specified for operation at 3.3 V (±0.3 V), with verified timing parameters including 70 MHz maximum clock frequency, 14 ns max propagation delay, and guaranteed setup/hold times (5 ns tsu, 1.5 ns th). Its AC CMOS process ensures stable logic thresholds and noise margins at 3.3 V, and its inputs tolerate voltages up to 6 V-enabling safe interfacing with 5 V peripherals in mixed-supply systems without external level translation.
Does the SN74AC534N have non-inverting outputs?
No, the SN74AC534N provides only inverting outputs (Q̅). Each of the eight Q pins delivers the logical complement of its corresponding D input after the positive clock edge. There are no true non-inverting Q outputs on this device. If both true and complement outputs are required, a second SN74AC534N or discrete inverters would be needed. This inverting architecture is explicitly documented in TI's functional block diagram and truth table for the SN74AC534N.
What is the maximum capacitive load the SN74AC534N can drive on its outputs?
The SN74AC534N is characterized to drive up to 50 pF loads with guaranteed timing (per TI's switching characteristics tables at VCC = 5 V and VCC = 3.3 V). Its ±24 mA output drive strength at 5 V supports heavier loading than standard TTL, but sustained operation into >50 pF may increase propagation delay and reduce noise margin. For reliable high-speed bus driving, TI recommends limiting trace+load capacitance to ≤50 pF and using proper PCB layout practices-including ground planes and short traces-as outlined in the SN74AC534N application notes.
Is the SN74AC534N RoHS compliant?
Yes, the SN74AC534N is RoHS compliant, as confirmed in TI's official packaging addendum: "RoHS: Yes" with lead finish NIPDAU. It meets EU Directive 2011/65/EU requirements for restriction of hazardous substances, including lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE. The device carries no exemptions and is suitable for use in environmentally regulated commercial and industrial products requiring full RoHS conformance.
SN74AC534N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74AC534N FAQ
1.How can I place an order for SN74AC534N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC534N 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 SN74AC534N reliable?
The price and inventory of SN74AC534N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC534N is usually 5 days.
3.What payment methods are accepted for SN74AC534N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC534N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC534N?
SN74AC534N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC534N 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 SN74AC534N?
For technical support, including SN74AC534N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC534N requirements.
6.How does Aetrix verify that SN74AC534N is sourced from the original manufacturer or authorized distributors?
All SN74AC534N 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 SN74AC534N meets industry standards.
7.What is the process for return or replacement of SN74AC534N?
All SN74AC534N units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC534N, 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 SN74AC534N part is unused and in its original packaging.
Return procedure for SN74AC534N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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