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Texas Instruments SN74AS534DW
- Part No.:
- SN74AS534DW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AS534DW.pdf
- Description:
- BUS DRIVER, AS SERIES
- Quantity:
- Payment:
- Shipping:
Inventory:1,950
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Product details
Overview
SN74AS534DW from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state inverting outputs, designed for high-capacitance bus driving in digital systems. It operates at 5 V supply, supports 125 MHz clock frequency, delivers ±48 mA output drive, and features buffered OE control enabling independent data retention during output disable.
For engineers reviewing the SN74AS534DW datasheet, SN74AS534DW pinout, SN74AS534DW application, or SN74AS534DW equivalent, this device is selected for high-speed bidirectional bus interfaces, I/O port expansion, and register-based data latching where low propagation delay (≤9 ns), strong sink/source capability, and precise setup/hold timing (2 ns each) are critical.
Technical Context
This IC implements eight independent D-type latches triggered on the positive clock edge, with inverted Q outputs and a shared active-low 3-state output-enable (OE) input. Its architecture decouples internal state retention from output control - OE disables outputs without affecting CLK/D sampling or stored data.
The device uses advanced Schottky-clamped TTL (AS) logic, delivering higher speed and lower power than ALS variants: 125 MHz max clock vs. 35 MHz for SN74ALS534A, and 48 mA sink current vs. 24 mA. All inputs are TTL-compatible, and outputs meet standard 3-state voltage thresholds under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | TTL AS (Advanced Schottky) - enables 125 MHz operation with reduced propagation delay vs. ALS |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V digital rails; absolute max 7 V |
| Max Clock Frequency | 125 MHz - supports high-throughput data capture in fast parallel buses |
| Output Drive | –15 mA high-level / +48 mA low-level - drives heavy capacitive loads without external buffers |
| Propagation Delay | tPLH/tPHL ≤ 8/9 ns - ensures tight timing margins in synchronous 10 ns–cycle systems |
| Setup/Hold Time | tsu = th = 2 ns - minimizes data window requirements for high-speed interface design |
| Operating Temperature | 0°C to 70°C - rated for commercial-grade industrial and computing applications |
Pinout & Package
SN74AS534DW is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, 2.65 mm max height, with 1.27 mm pitch and RoHS-compliant NiPdAu lead finish. Pin 1 is marked by a beveled corner or notch; device is tape-and-reel packaged (2000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control: pulls all eight Q outputs to high-impedance when high; no effect on internal latch state |
| 2–9 | D1–D8 (Data Inputs) | Asynchronous data inputs sampled on CLK↑; TTL-compatible voltage thresholds (VIH = 2 V, VIL = 0.8 V) |
| 10 | GND | Power ground reference for all logic and output stages |
| 11–18 | Q1–Q8 (Inverted Outputs) | Complementary outputs (Q = NOT D after CLK↑); 3-state capable with ±48 mA drive strength |
| 19 | CLK | Positive-edge-triggered clock input; minimum pulse width 4 ns high / 3 ns low |
| 20 | VCC | +5 V supply rail; decoupling required near pin for stable high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state outputs | Enables direct connection to shared bidirectional buses without external inverters or pull-ups |
| Buffered OE input | Prevents output glitches during enable/disable transitions; supports clean bus arbitration |
| High-speed AS logic | Delivers 125 MHz operation with sub-10 ns propagation-outperforms ALS counterparts by >3.5× in clock rate |
| Independent data retention | Allows new D-input data to be loaded or old data held while outputs remain disabled via OE |
| Robust drive capability | 48 mA sink current sustains logic-low levels across long traces or multiple TTL inputs without signal degradation |
Applications
| Microprocessor Bus Interface | Industrial I/O Expansion |
|---|---|
Use Scenario: Interfacing an 8-bit microprocessor data bus to peripheral devices with mismatched timing or loading requirements. IC Role / Device Role / Timing Role: Acts as a registered, inverting bus transceiver - latches data on CLK↑ and isolates bus segments via OE-controlled 3-state outputs. Use Value: Eliminates need for discrete buffers and level shifters; 2 ns setup/hold and 9 ns max tPHL ensure compatibility with 8-MHz Z80 or 6502 derivatives. |
Use Scenario: Adding programmable digital input/output ports to PLC or motion controller backplanes. IC Role / Device Role / Timing Role: Functions as an octal I/O port register - stores sensor status or actuator commands and drives relay drivers or optocouplers directly. Use Value: 48 mA sink per output drives industrial loads (e.g., 24 V DC solenoids via NPN interface) without external drivers; OE allows hot-swap-safe port reconfiguration. |
| Memory Address Latching | Legacy System Data Buffering |
Use Scenario: Latching 8-bit address or control signals in vintage computer or embedded system memory subsystems. IC Role / Device Role / Timing Role: Serves as a high-speed address latch - captures and holds address bits synchronized to CPU clock edge for static RAM or ROM access. Use Value: 125 MHz rating exceeds typical 4–8 MHz bus clocks; inverted outputs match common address decode logic polarity conventions. |
Use Scenario: Isolating and buffering parallel data paths between legacy peripherals (e.g., dot-matrix printers, GPIB instruments) and modern controllers. IC Role / Device Role / Timing Role: Provides controlled, glitch-free data staging between asynchronous domains using OE-gated 3-state outputs. Use Value: Buffered OE and sub-10 ns delays prevent metastability and bus contention; TTL compatibility ensures plug-and-play integration with RS-232 or Centronics interfaces. |
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 |
|---|---|---|---|
| SN74ALS534ADWR | ALS family: 35 MHz max clock, 24 mA IOL, 12 ns max tPHL - slower, lower drive, higher noise margin | Suitable for lower-speed, noise-sensitive industrial control where power efficiency outweighs speed | Select when operating below 40 MHz and requiring improved noise immunity over AS logic |
| SN74F574N | F-family: non-inverting outputs, 100 MHz max clock, 20 mA IOL, 10 ns tPHL - same speed class but different logic polarity and drive | Used where non-inverted Q outputs align with downstream logic; less robust drive for heavy loads | Choose only if system logic requires true (non-inverted) outputs and 48 mA drive is not needed |
Compared with SN74ALS534ADWR and SN74F574N, SN74AS534DW provides the highest clock rate and strongest output drive among pin-compatible octal D-flip-flops in SOIC-20, making it optimal for bandwidth-constrained bus interfaces where signal integrity under load is critical.
Availability
SN74AS534DW is available at Aetrix Electronics and suitable for microprocessor bus interfacing, industrial I/O expansion, memory address latching, and legacy system data buffering requiring stable component supply across extended production cycles.
Supply support for SN74AS534DW 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
SN74AS534DW belongs to TI's legacy 74AS logic family, engineered for high-speed digital system interconnect - emphasizing minimal propagation delay, robust fanout, and reliable 3-state bus control in commercial-temperature environments.
FAQ
What is the maximum clock frequency supported by SN74AS534DW?
The SN74AS534DW supports a maximum clock frequency of 125 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, CL = 50 pF). This rating is validated across the full 0°C to 70°C temperature range and reflects its Advanced Schottky TTL process advantage over ALS or F-series equivalents. The SN74AS534DW achieves this performance with guaranteed tPLH ≤ 8 ns and tPHL ≤ 9 ns.
Does SN74AS534DW have inverting or non-inverting outputs?
SN74AS534DW has inverting outputs: the Q pins deliver the logical complement of the D inputs sampled on the positive clock edge. This is confirmed in the device description ("OCTAL D-TYPE EDGE-TRIGGERED FLIP-FLOPS WITH 3-STATE OUTPUTS") and function table, where Q = NOT D after CLK↑. The SN74AS534DW is functionally identical to SN74AS374 in behavior but with inverted output polarity.
Can SN74AS534DW drive a 50-pF bus capacitance reliably?
Yes, SN74AS534DW is explicitly designed for driving highly capacitive loads: its 48 mA low-level output current and sub-10 ns propagation delays ensure clean signal edges into 50 pF loads at 125 MHz. The datasheet specifies switching characteristics with CL = 50 pF, R1 = R2 = 500 Ω, confirming SN74AS534DW's suitability for such conditions without external termination or buffering.
What is the purpose of the buffered OE input on SN74AS534DW?
The buffered OE input on SN74AS534DW prevents output switching glitches during enable/disable transitions and isolates the output stage from input noise. Unlike unbuffered controls, it ensures monotonic, bounce-free 3-state entry/exit - critical for bus arbitration. OE does not affect internal flip-flop operation, allowing SN74AS534DW to retain or update data while outputs remain high-impedance.
Is SN74AS534DW pin-compatible with SN74ALS534ADWR?
Yes, SN74AS534DW and SN74ALS534ADWR share identical 20-pin SOIC (DW) packaging, pinout, and functional block diagram - both feature OE, CLK, eight D inputs, eight inverted Q outputs, VCC, and GND in the same positions. However, SN74AS534DW offers higher speed (125 MHz vs. 35 MHz) and stronger drive (48 mA vs. 24 mA), so direct substitution requires verifying timing and loading margins in the target design.
SN74AS534DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- 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:
- 125 MHz
- Max Propagation Delay @ V, Max CL:
- 9ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 15mA, 48mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 128 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AS534DW FAQ
1.How can I place an order for SN74AS534DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS534DW 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 SN74AS534DW reliable?
The price and inventory of SN74AS534DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS534DW is usually 5 days.
3.What payment methods are accepted for SN74AS534DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS534DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS534DW?
SN74AS534DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS534DW 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 SN74AS534DW?
For technical support, including SN74AS534DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS534DW requirements.
6.How does Aetrix verify that SN74AS534DW is sourced from the original manufacturer or authorized distributors?
All SN74AS534DW 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 SN74AS534DW meets industry standards.
7.What is the process for return or replacement of SN74AS534DW?
All SN74AS534DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS534DW, 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 SN74AS534DW part is unused and in its original packaging.
Return procedure for SN74AS534DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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