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Texas Instruments SN74AS534DWR
- Part No.:
- SN74AS534DWR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AS534DWR.pdf
- Description:
- BUS DRIVER, AS SERIES
- Quantity:
- Payment:
- Shipping:
Inventory:1,731
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Product details
Overview
SN74AS534DWR 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 4.5–5.5 V, supports 125 MHz clock frequency, delivers ±48 mA output drive, and functions across 0°C to 70°C - ideal for bidirectional data bus interfaces in industrial control backplanes.
For engineers reviewing the SN74AS534DWR datasheet, SN74AS534DWR pinout, SN74AS534DWR application, or SN74AS534DWR equivalent, key selection criteria include its 20-pin SOIC (DW) package, inverted Q outputs, OE-controlled 3-state operation, and high-speed propagation delays (tPLH/tPHL ≤ 8 ns).
Technical Context
This device implements eight independent D-type latches triggered on the positive edge of CLK, each producing complemented (inverted) Q outputs. Its buffered OE input enables/disables all outputs without affecting internal state retention or data capture timing.
The SN74AS534DWR uses advanced Schottky (AS) bipolar technology to achieve high-speed switching (fmax = 125 MHz), low setup/hold times (tsu/th = 2 ns), and robust drive capability (IOL = 48 mA), distinguishing it from ALS variants with lower speed and drive strength.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74AS - high-speed Schottky TTL with improved noise immunity and fanout |
| Function | Octal D-type positive-edge-triggered flip-flop with inverted 3-state outputs |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V digital systems |
| Max Clock Frequency | 125 MHz - enables high-throughput data latching in fast bus architectures |
| Output Drive | ±48 mA - sufficient to drive heavily loaded PCB traces or multiple TTL inputs without external buffers |
| Propagation Delay | tPLH/tPHL ≤ 8 ns - ensures tight timing margins in synchronous designs |
| Operating Temperature | 0°C to 70°C - rated for commercial/industrial ambient environments |
Pinout & Package
SN74AS534DWR 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 (MSL Level-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | D1–D8 Data Inputs | Asynchronous data inputs sampled on CLK↑; logic states inverted at corresponding Q outputs |
| 9 | GND | Ground reference for all internal circuitry and output drivers |
| 10, 11, 13, 14, 15, 16, 17, 18 | Q1–Q8 Outputs | Inverted latched outputs; placed in high-impedance state when OE = high |
| 12 | VCC | Positive supply rail (4.5–5.5 V); powers all logic and output stages |
| 19 | CLK | Positive-edge-sensitive clock input controlling simultaneous latching of all eight D inputs |
| 20 | OE | Active-low output-enable; disables all Q outputs to high-Z without affecting internal flip-flop state |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state outputs | Enables direct connection to shared buses without external inverters or pull-ups |
| Buffered OE input | Prevents bus contention during hot-swap or partial system reset by cleanly isolating outputs | High-speed AS logic | Delivers 125 MHz operation with sub-10 ns propagation delays for real-time data capture |
| Robust output drive | ±48 mA sink/source capability eliminates need for external bus transceivers in moderate-load applications |
| Retentive OE behavior | Allows new data to be latched or old data retained while outputs remain disabled - critical for glitch-free bus arbitration |
Applications
| Industrial Backplane Bus Interface | Programmable Logic Controller I/O Expansion |
|---|---|
Use Scenario: Interfacing microcontroller data buses to modular I/O cards in factory automation racks. IC Role / Device Role / Timing Role: Acts as a bidirectional data latch and bus driver, synchronizing asynchronous module reads/writes to the main controller clock domain. Use Value: Inverted 3-state outputs allow direct connection to legacy 5 V TTL backplanes; 48 mA drive handles long trace capacitance without signal degradation. | Use Scenario: Expanding parallel digital I/O capacity in PLC CPU modules using standardized daughterboard slots. IC Role / Device Role / Timing Role: Provides synchronized, isolated data staging between the CPU bus and field-side I/O registers. Use Value: OE-controlled high-Z mode enables safe hot-insertion of I/O modules; 2 ns setup/hold time ensures reliable sampling at 100+ MHz CPU bus speeds. |
| Test Equipment Digital Pattern Generator | Legacy Computer System Memory Buffering |
Use Scenario: Generating precise, synchronized digital stimulus waveforms for IC functional testing. IC Role / Device Role / Timing Role: Latches pattern data from a high-speed shift register and drives test pins with controlled timing edges. Use Value: 125 MHz clock rating and 8 ns propagation delay support generation of >100 Mbps deterministic patterns with minimal skew. | Use Scenario: Isolating and buffering address/data lines between vintage CPU and memory subsystems during system upgrades. IC Role / Device Role / Timing Role: Serves as a transparent, edge-triggered buffer that maintains signal integrity across mixed-vintage board interconnects. Use Value: Inverted outputs match legacy bus polarity conventions; 3-state capability allows seamless integration into existing bus arbitration schemes. |
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: lower speed (35 MHz), reduced drive (24 mA), higher tPLH/tPHL (≤12 ns) | Suitable only for slower legacy systems where power consumption is prioritized over speed | Select only if design constraints require ALS compatibility or lower ICC (19 mA vs. 128 mA) |
| SN74F534N | F-family: 100 MHz max, 20 mA drive, non-inverting outputs, PDIP-20 only | Requires external inversion for polarity-matching; limited to through-hole assembly | Choose only for cost-sensitive, low-volume through-hole designs needing F-series footprint compatibility |
Compared with SN74ALS534ADWR and SN74F534N, the SN74AS534DWR provides superior speed, drive strength, and SOIC packaging - making it the optimal choice for modern high-density, high-throughput digital interface applications requiring guaranteed 125 MHz operation and robust bus loading capability.
Availability
SN74AS534DWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, programmable logic controller I/O expansion, test equipment pattern generation, and legacy computer memory buffering requiring stable component supply and long-term lifecycle support.
Supply support for SN74AS534DWR 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 delivering analog and embedded processing solutions, with decades of expertise in logic IC design and manufacturing reliability.
The SN74AS534DWR belongs to TI's 74AS logic family, engineered specifically for high-speed, high-drive digital interfacing in industrial and instrumentation systems where timing precision and bus-loading resilience are critical.
FAQ
What is the maximum clock frequency supported by the SN74AS534DWR?
The SN74AS534DWR supports a maximum clock frequency of 125 MHz under recommended operating conditions (VCC = 4.5–5.5 V, CL = 50 pF). This specification is verified across the full commercial temperature range (0°C to 70°C) and reflects its advanced 74AS Schottky TTL process, enabling reliable high-speed data latching in demanding digital interfaces. The SN74AS534DWR achieves this performance with tPLH/tPHL ≤ 8 ns and tsu/th = 2 ns.
Does the SN74AS534DWR have inverting or non-inverting outputs?
The SN74AS534DWR has inverting outputs: each Q output presents the logical complement of its corresponding D input after the positive clock edge. This is explicitly confirmed in the device description ("OCTAL D-TYPE EDGE-TRIGGERED FLIP-FLOPS WITH 3-STATE OUTPUTS" and "'ALS534A and SN74AS534 have inverted outputs"). The SN74AS534DWR's truth table and logic diagram further validate that Q = NOT(D) on CLK↑.
What package type and dimensions does the SN74AS534DWR use?
The SN74AS534DWR uses a 20-pin SOIC (DW) package per JEDEC MS-013, measuring 12.8 mm × 7.5 mm × 2.65 mm max height, with 1.27 mm lead pitch and NiPdAu lead finish. It is RoHS-compliant, MSL Level-1 rated, and supplied in 2000-piece tape-and-reel format (reel diameter 330 mm, width 24.4 mm). This package is distinct from PDIP (N) or ceramic (J/FK) variants used by related part numbers.
Can the SN74AS534DWR operate with a 3.3 V supply?
No, the SN74AS534DWR is not rated for 3.3 V operation. Its absolute maximum supply voltage is 7 V, but the recommended operating range is strictly 4.5 V to 5.5 V. Electrical characteristics including VOH, VOL, and timing parameters are specified only within this 5 V nominal range. Using 3.3 V would result in undefined logic levels, excessive propagation delay, and potential failure to meet the 125 MHz specification. For 3.3 V systems, consider TI's 74LVC series alternatives instead of the SN74AS534DWR.
How does the output-enable (OE) pin function on the SN74AS534DWR?
The OE pin on the SN74AS534DWR is an active-low control that places all eight Q outputs in a high-impedance (high-Z) state when asserted (OE = high), while leaving internal flip-flop states unaffected. When OE = low, outputs drive normal logic levels (inverted D values). This behavior is confirmed in the FUNCTION TABLE and electrical specs: IOZH/IOZL ≤ ±50 µA in high-Z mode, and OE does not impact tPLH/tPHL or data retention. The SN74AS534DWR thus supports safe bus sharing and hot-swap operation without disrupting internal register state.
SN74AS534DWR 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
SN74AS534DWR FAQ
1.How can I place an order for SN74AS534DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS534DWR 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 SN74AS534DWR reliable?
The price and inventory of SN74AS534DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS534DWR is usually 5 days.
3.What payment methods are accepted for SN74AS534DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS534DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS534DWR?
SN74AS534DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS534DWR 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 SN74AS534DWR?
For technical support, including SN74AS534DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS534DWR requirements.
6.How does Aetrix verify that SN74AS534DWR is sourced from the original manufacturer or authorized distributors?
All SN74AS534DWR 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 SN74AS534DWR meets industry standards.
7.What is the process for return or replacement of SN74AS534DWR?
All SN74AS534DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS534DWR, 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 SN74AS534DWR part is unused and in its original packaging.
Return procedure for SN74AS534DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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