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Texas Instruments SN74ALS534ADW
- Part No.:
- SN74ALS534ADW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS534ADW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,881
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Product details
Overview
SN74ALS534ADW from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state inverting outputs, designed for bus driving in TTL-compatible digital systems. It operates at 5 V supply, supports up to 35 MHz clock frequency, features 24 mA low-level output drive, and is qualified for 0°C to 70°C industrial temperature range. It serves as a bidirectional bus driver or I/O port register in legacy control and data-path applications.
For engineers reviewing the SN74ALS534ADW datasheet, SN74ALS534ADW pinout, SN74ALS534ADW application, or SN74ALS534ADW equivalent, key selection criteria include its 3-state inverting output architecture, 20-pin SOIC (DW) package, 12 ns max tPHL propagation delay, and compatibility with ALS logic family timing and voltage thresholds.
Technical Context
This device implements eight independent D-type latches triggered on the positive clock edge, each producing inverted Q outputs. Its buffered OE input enables high-impedance state without affecting internal latch states, allowing data retention during bus release.
The SN74ALS534ADW uses bipolar ALS (Advanced Low-Power Schottky) technology, delivering higher speed and lower power than standard LS logic. It maintains strict TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V) and drives loads up to 24 mA low / –2.6 mA high while meeting 10 ns setup time and zero hold time requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky), TTL-compatible input/output levels |
| Supply Voltage | 4.5 V to 5.5 V - ensures robust operation across industrial rail tolerances |
| Max Clock Frequency | 35 MHz - supports high-speed synchronous data capture in legacy bus systems |
| Output Drive | 24 mA sink / –2.6 mA source - sufficient to drive 50-pF loads or multiple TTL inputs |
| Propagation Delay | 12 ns max tPHL (CLK to Q) - enables precise timing in 28–30 ns cycle designs |
| Operating Temperature | 0°C to 70°C - certified for commercial/industrial ambient environments |
| 3-State Enable Delay | 10 ns max tPLZ (OE to Z) - allows fast bus arbitration and multiplexing |
Pinout & Package
SN74ALS534ADW is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, 12.8 mm long, with 1.27 mm pitch and maximum height of 2.65 mm. It complies with JEDEC MS-013 and is RoHS-compliant with NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control: disables all eight outputs to high-impedance state without affecting internal latch values |
| 2–9 | 1D–8D | Data inputs for each of eight D-type flip-flops; sampled on rising CLK edge |
| 11–18 | 1Q–8Q | Inverted complementary outputs (Q̅); driven low/high or placed in high-Z per OE state |
| 10 | GND | Ground reference for all logic and output stages |
| 20 | VCC | +5 V supply for internal logic and output drivers |
| 19 | CLK | Common clock input; positive-edge sensitive for simultaneous latching of all eight D inputs |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state outputs | Enables direct connection to shared data buses without external pull-ups or interface logic |
| Buffered OE input | Prevents output glitches during enable/disable transitions and isolates control path from bus noise |
| Zero hold time (th = 0 ns) | Allows immediate data updates after clock edge-simplifies PCB layout and timing closure |
| Retained latch state during OE high | Permits asynchronous data loading or preservation while bus is released for other masters |
| ALS process technology | Delivers 3× speed improvement over standard LS logic with comparable power consumption |
Applications
| Industrial PLC Backplane Interface | Legacy Computer I/O Expansion |
|---|---|
Use Scenario: Interfacing microcontroller GPIO to parallel backplane bus with multiple slot peripherals in programmable logic controllers. IC Role / Device Role / Timing Role: Octal bus transceiver providing direction-controlled, isolated data transfer between CPU and peripheral cards using OE-gated 3-state outputs. Use Value: Eliminates need for discrete bus buffers; inverting outputs match legacy address/data bus polarity conventions in 1980s–1990s industrial hardware. |
Use Scenario: Adding parallel printer or floppy disk controller ports to retro-computing platforms using ISA or similar 8-bit expansion buses. IC Role / Device Role / Timing Role: Latched I/O port register synchronizing host writes to peripheral devices with precise clock-aligned sampling and tristate isolation. Use Value: Provides 8-bit data latching with sub-15 ns propagation, enabling reliable handshaking at 3–5 MHz bus speeds common in vintage PC architectures. |
| Test Equipment Digital Pattern Generator | Automated Test Fixture Data Capture |
Use Scenario: Generating synchronized stimulus patterns for digital IC functional testing where deterministic timing and bus contention avoidance are critical. IC Role / Device Role / Timing Role: Edge-triggered waveform register holding test vectors; OE controlled by sequencer to gate outputs onto shared test bus only during valid phases. Use Value: Enables glitch-free vector switching via OE-controlled high-Z transitions, reducing false triggers caused by bus float during pattern changes. |
Use Scenario: Capturing parallel sensor or actuator status signals from multiple subsystems into a central controller in manufacturing test fixtures. IC Role / Device Role / Timing Role: Synchronized input latch capturing 8-bit status words on rising CLK; outputs held stable until read by host via OE-controlled bus access. Use Value: Guarantees atomic snapshot acquisition with zero hold time requirement, preventing metastability in noisy factory-floor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type 3-state flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS534AN | Same logic function and timing, but in 20-pin PDIP (N) package; no reflow compatibility | Suitable for through-hole prototyping or legacy board repair where SOIC footprint is unavailable | Select SN74ALS534AN only when manual soldering or socket-based validation is required. |
| SN74AS534 | Faster (125 MHz max clock), higher drive (48 mA), but consumes ~4× more ICC (120 mA vs 31 mA) and requires tighter layout for noise control | Better suited for high-speed data acquisition or real-time control loops demanding sub-10 ns delays | Choose SN74AS534 only when speed justifies increased power and EMI management overhead. |
Compared with SN74ALS534AN, the SN74ALS534ADW offers surface-mount reliability and automated assembly support; compared with SN74AS534, it trades speed for lower power and broader noise margin-making it optimal for cost-sensitive, thermally constrained industrial backplanes.
Availability
SN74ALS534ADW is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, legacy computer I/O expansion, test equipment pattern generation, automated test fixture data capture, and embedded control system upgrades requiring stable component supply across extended product lifecycles.
Supply support for SN74ALS534ADW 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial and automotive qualification.
The SN74ALS534ADW belongs to TI's legacy ALS logic portfolio, engineered for backward compatibility with 1980s–1990s TTL-based digital systems requiring reliable, low-glitch bus interfacing and synchronous data latching.
FAQ
What logic family does the SN74ALS534ADW belong to, and how does it differ from standard LS?
The SN74ALS534ADW belongs to the Advanced Low-Power Schottky (ALS) logic family. It delivers approximately three times the speed of standard LS logic while maintaining similar power consumption. Unlike LS, ALS uses optimized bipolar transistor structures that reduce propagation delay-evident in the SN74ALS534ADW's 12 ns max tPHL versus 25+ ns for LS equivalents-without increasing quiescent current significantly.
Does the SN74ALS534ADW support non-inverted outputs, or is inversion fixed?
The SN74ALS534ADW provides only inverting outputs (Q̅), as confirmed by its function table, logic diagram, and datasheet labeling. There is no non-inverting variant within the SN74ALS534A series. If true Q outputs are required, designers must use external inverters or select alternate parts such as the SN74ALS374A, which shares pinout and timing but delivers non-inverted outputs.
Can the SN74ALS534ADW operate reliably at 3.3 V supply?
No-the SN74ALS534ADW is specified only for 4.5 V to 5.5 V operation. Its input thresholds (VIH = 2 V min, VIL = 0.8 V max) and output drive characteristics are calibrated for 5 V TTL compatibility. Operation below 4.5 V risks failure to meet timing specs, reduced noise margin, or undefined output states. For 3.3 V systems, consider modern alternatives like the SN74LVC574A.
What is the meaning of "zero hold time" in the SN74ALS534ADW datasheet?
Zero hold time (th = 0 ns) means the D-input data may change immediately after the rising CLK edge without corrupting the latched value. This simplifies timing design by eliminating the need for post-clock data stability windows. In practice, the SN74ALS534ADW captures the exact logic level present at D at the moment of CLK transition, enabling tighter integration with fast microcontrollers or FPGA clock domains.
Is the SN74ALS534ADW pin-compatible with the SN74ALS374A?
Yes-the SN74ALS534ADW and SN74ALS374A share identical pinout, package dimensions, and electrical interface. They differ only in output polarity: SN74ALS534ADW outputs are inverted (Q̅), while SN74ALS374A outputs are non-inverted (Q). This allows direct substitution in layouts where inversion is handled at system level or compensated via software logic.
SN74ALS534ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 35 MHz
- Max Propagation Delay @ V, Max CL:
- 16ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 2.6mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 19 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ALS534ADW FAQ
1.How can I place an order for SN74ALS534ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS534ADW 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 SN74ALS534ADW reliable?
The price and inventory of SN74ALS534ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS534ADW is usually 5 days.
3.What payment methods are accepted for SN74ALS534ADW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS534ADW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS534ADW?
SN74ALS534ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS534ADW 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 SN74ALS534ADW?
For technical support, including SN74ALS534ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS534ADW requirements.
6.How does Aetrix verify that SN74ALS534ADW is sourced from the original manufacturer or authorized distributors?
All SN74ALS534ADW 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 SN74ALS534ADW meets industry standards.
7.What is the process for return or replacement of SN74ALS534ADW?
All SN74ALS534ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS534ADW, 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 SN74ALS534ADW part is unused and in its original packaging.
Return procedure for SN74ALS534ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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