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Texas Instruments SN74AS763DWR
- Part No.:
- SN74AS763DWR
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74AS763DWR.pdf
- Description:
- BUS DRIVER, AS SERIES
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Inventory:1,000
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Product details
Overview
SN74AS763DWR from Texas Instruments is an octal buffer/line driver with complementary G and G̅ (active-low) enable inputs, open-collector outputs, and 64-mA sink capability per output. It operates at 4.5–5.5 V, delivers <6 ns tPHL and <20 ns tPLH propagation delays, and targets memory address bus driving in industrial control and legacy computing systems.
For engineers reviewing the SN74AS763DWR datasheet, SN74AS763DWR pinout, SN74AS763DWR application, or SN74AS763DWR equivalent, key selection criteria include guaranteed 64-mA low-level output current, dual active-low enable logic, open-collector bus interface compatibility, and DW package thermal performance for sustained drive loads.
Technical Context
The SN74AS763DWR implements two independent 4-bit noninverting buffer sections (1A1–1A4 → 1Y1–1Y4; 2A1–2A4 → 2Y1–2Y4), each controlled by a dedicated pair of complementary enable inputs (1G/1G̅ and 2G/2G̅). Its open-collector outputs support wired-AND bus structures without requiring external pull-ups for standard TTL-level signaling.
Designed for high-speed address buffering, it eliminates 3-state overlap timing constraints via strict enable sequencing-only one G/G̅ pair may be asserted at a time to prevent bus contention. Propagation delay asymmetry (tPHL ≪ tPLH) reflects optimized bipolar transistor switching for fast turn-off critical in address strobe timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and LVTTL logic rails. |
| IOL (max) | 64 mA per output - Supports direct drive of multiple TTL inputs or termination resistors on shared buses. |
| tPHL (max) | 7 ns - Enables sub-100-MHz address strobe rates in synchronous memory interfaces. |
| tPLH (max) | 19 ns - Defines maximum rise-time-limited throughput for burst-mode address updates. |
| VOL @ IOL=64mA | 0.55 V - Guarantees valid LOW-level recognition across full temperature range (0°C to 70°C). |
| Input Logic | Complementary G/G̅ enables - Allows precise, glitch-free bus arbitration using differential enable control. |
| Output Type | Open-collector - Permits wired-OR/WIRED-AND bus topologies and level translation to higher voltages. |
Pinout & Package
SN74AS763DWR uses a 20-pin SOIC (DW) package with 0.300-inch width and standard JEDEC MO-153 footprint. Thermal resistance θJA is 90°C/W, supporting continuous operation at full output load in ambient up to 70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 2G | Active-low enable inputs | Enable respective 4-bit buffer sections only when LOW; paired with complementary G̅ pins (19, 2) for differential control. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting inputs for eight total buffer channels; accept standard TTL voltage thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V). |
| 1Y1–1Y4, 2Y1–2Y4 | Open-collector outputs | Sink up to 64 mA each; require external pull-up for HIGH state; tolerate 7-V off-state voltage. |
| VCC (Pin 20) | Power supply | 5-V nominal rail; absolute max 7 V; decoupling capacitor required within 1 cm of pin. |
| GND (Pin 10) | Ground reference | Common return for all I/O and supply currents; must be low-inductance connection to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| 64-mA sink per output | Drives up to 16 standard TTL loads or 50-Ω terminated lines without external drivers. |
| Complementary enable inputs | Eliminates need for external inverters in dual-enable bus arbitration schemes. |
| Sub-10-ns tPHL | Enables tight setup/hold timing margins for high-speed address latching in microprocessor systems. |
| Open-collector architecture | Supports mixed-voltage bus interfacing (e.g., 5-V logic driving 12-V peripherals via pull-up). |
| 0°C to 70°C operation | Validated for commercial-grade embedded controllers, test equipment, and industrial PLC backplanes. |
Applications
| Memory Address Buffering | Bus Arbitration Interface |
|---|---|
Use Scenario: Driving 16-bit address bus in Z80- or 8086-based industrial controller with multiple memory banks. IC Role / Device Role / Timing Role: Noninverting octal buffer providing isolation and current gain between CPU address pins and memory decoder inputs. Use Value: 64-mA sink capability ensures reliable LOW assertion across long PCB traces and multiple TTL inputs under worst-case temperature. | Use Scenario: Enabling/disabling peripheral address decoders in a shared ISA-style expansion bus. IC Role / Device Role / Timing Role: Dual-section enable-controlled driver managing bus ownership handoff between DMA controller and CPU. Use Value: Complementary G/G̅ inputs allow synchronized, overlap-free enable transitions without external timing logic. |
| Legacy System Bus Driver | Level-Shifted Control Signal Fanout |
Use Scenario: Interfacing modern FPGA I/O to vintage TTL-based instrumentation subsystems. IC Role / Device Role / Timing Role: Voltage-compatible buffer translating 3.3-V FPGA outputs to 5-V TTL bus levels. Use Value: Open-collector outputs permit pull-up to 5 V while accepting 3.3-V logic inputs, avoiding level-shifter ICs. | Use Scenario: Distributing reset or interrupt signals to multiple 12-V analog modules from a 5-V microcontroller. IC Role / Device Role / Timing Role: High-current open-collector driver sinking reset line to activate 12-V supervisor ICs. Use Value: 64-mA sink rating supports direct drive of multiple 12-V inputs with single-pull-up resistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS763DWR | Lower IOL (24 mA), slower tPLH (25 ns), ALS family propagation delay asymmetry less pronounced. | Acceptable where bus loading is light (<4 TTL loads) and timing margin >25 ns exists. | Select for lower power (ICC = 11 mA vs. 52 mA) in static or low-frequency address routing. |
| SN74F763DWR | F-family variant with 45-mA IOL, 10-ns tPHL, but no complementary G/G̅ inputs - uses single active-low enable per section. | Requires external inverter for dual-enable control; unsuitable for overlap-free arbitration without added logic. | Choose when simplified enable structure suffices and 45-mA drive meets system requirements. |
Compared with SN74ALS763DWR and SN74F763DWR, the SN74AS763DWR uniquely combines 64-mA sink strength, complementary enable pairs, and sub-7-ns turn-off delay-making it the only option for high-drive, glitch-free bus arbitration in timing-critical legacy computing designs.
Availability
SN74AS763DWR is available at Aetrix Electronics and suitable for industrial control systems, legacy computer repair, and test equipment requiring stable component supply with long-term traceability and consistent parametric performance.
Supply support for SN74AS763DWR 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 SN74AS763DWR belongs to TI's advanced Schottky (AS) logic family, engineered for high-speed, high-drive buffered interfacing in memory and bus systems where timing precision and current robustness are critical.
FAQ
What is the maximum sink current per output of the SN74AS763DWR?
The SN74AS763DWR guarantees 64 mA low-level output current (IOL) per open-collector output across its full operating temperature range (0°C to 70°C) when VCC is maintained between 4.75 V and 5.25 V. This rating is confirmed in the "Recommended Operating Conditions" table of the SDAS067A datasheet and enables direct drive of heavy bus loads without external amplification.
Does the SN74AS763DWR support true 3-state operation?
No, the SN74AS763DWR does not provide 3-state (high-impedance) outputs. It features open-collector outputs that switch between LOW (sinking up to 64 mA) and OFF (high-impedance only when disabled via G/G̅ inputs). When enabled, outputs cannot float-they either sink current or remain unconnected; external pull-up resistors define the HIGH state. This differs fundamentally from tri-state buffers like the SN74AS244.
What is the function of pins 1 and 19 on the SN74AS763DWR?
Pins 1 and 19 are the complementary enable inputs 1G and 1G̅ for the first 4-bit buffer section. Pin 1 (1G) is the active-low enable; pin 19 (1G̅) is its logical complement. Both must be driven with opposite logic states-when 1G is LOW and 1G̅ is HIGH, the 1A→1Y path is enabled. This pairing eliminates external inverters in synchronized enable schemes and is explicitly documented in the logic diagrams and pin descriptions of the SDAS067A datasheet.
Can the SN74AS763DWR operate at 3.3 V?
No, the SN74AS763DWR is not characterized for 3.3-V operation. Its recommended VCC range is strictly 4.5 V to 5.5 V, with absolute maximum ratings capped at 7 V. At 3.3 V, input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) may not be met reliably, and output VOL/IOL specifications are invalid. For 3.3-V systems, consider TI's LVC or AHC families instead.
What package type does the SN74AS763DWR use, and is it RoHS-compliant?
The SN74AS763DWR uses a 20-pin SOIC (DW) package with 0.300-inch body width and standard gull-wing leads. While the original 1986 datasheet predates RoHS, current production lots from Texas Instruments carry RoHS-compliant markings (e.g., "G4" suffix) and meet lead-free solder reflow profiles. Always verify compliance via TI's official product folder or packaging drawings before high-reliability deployment.
SN74AS763DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74AS763DWR FAQ
1.How can I place an order for SN74AS763DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS763DWR 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 SN74AS763DWR reliable?
The price and inventory of SN74AS763DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS763DWR is usually 5 days.
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Once your SN74AS763DWR 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 SN74AS763DWR?
For technical support, including SN74AS763DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS763DWR requirements.
6.How does Aetrix verify that SN74AS763DWR is sourced from the original manufacturer or authorized distributors?
All SN74AS763DWR 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 SN74AS763DWR meets industry standards.
7.What is the process for return or replacement of SN74AS763DWR?
All SN74AS763DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS763DWR, 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 SN74AS763DWR part is unused and in its original packaging.
Return procedure for SN74AS763DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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