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Texas Instruments SN74AS230ADWR
- Part No.:
- SN74AS230ADWR
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74AS230ADWR.pdf
- Description:
- BUS DRIVER, AS SERIES
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Inventory:4,600
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Product details
Overview
SN74AS230ADWR from Texas Instruments is an octal 3-state noninverting buffer/driver with true and complementary outputs, designed for memory address driving, clock distribution, and bus interfacing. It features dual independent 4-bit sections (1A/1Y and 2A/2Y), 3-state control via active-low OE inputs, 64 mA current-sinking capability per output, and operation across 0°C to 70°C.
For engineers reviewing the SN74AS230ADWR datasheet, SN74AS230ADWR pinout, SN74AS230ADWR application, or SN74AS230ADWR equivalent, key selection criteria include its high-current 3-state drive strength, dual-section enable control, fast propagation delays (≤6.5 ns), compatibility with TTL-level logic families, and SOIC-20 packaging for space-constrained board layouts.
Technical Context
This device implements two independent 4-bit noninverting buffer sections, each with dedicated active-low output-enable (1OE, 2OE) controls. Each section provides true outputs (1Y1–1Y4, 2Y1–2Y4) and accepts standard TTL-compatible inputs (VIH = 2 V min, VIL = 0.8 V max).
Its 3-state architecture supports bidirectional bus loading with symmetrical enable timing: tPZH/tPLZ ≤ 9.5 ns and tPHZ/tPLZ ≤ 9.5 ns. The AS family's bipolar Schottky design delivers high-speed performance while maintaining compatibility with legacy 74LS and 74ALS systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5 V to 5.5 V - Ensures stable operation under standard 5 V TTL rail with ±10% tolerance. |
| Output Sink Current (IOL) | 64 mA - Enables direct drive of heavy capacitive loads (e.g., >100 pF buses) without external buffers. |
| Propagation Delay (tPLH/tPHL) | 1 ns to 6.5 ns - Supports high-speed address/data strobing in memory subsystems up to ~150 MHz effective toggle rate. |
| 3-State Enable/Disable Time | tPZH ≤ 6 ns, tPLZ ≤ 9.5 ns - Minimizes bus contention windows during multi-device arbitration. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade embedded computing and industrial control applications. |
| Input Voltage Thresholds | VIH ≥ 2 V, VIL ≤ 0.8 V - Guarantees reliable recognition of standard TTL logic levels across voltage and temperature. |
| Output Voltage Levels | VOH ≥ 2.4 V @ IOH = −15 mA; VOL ≤ 0.55 V @ IOL = 64 mA - Maintains noise margin >0.4 V in loaded conditions. |
Pinout & Package
SN74AS230ADWR 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. Pin 1 is marked by a beveled corner or notch on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for Section 1 and Section 2 - asserted low enables respective Y outputs. |
| 2–5, 11–14 | 1A1–1A4, 2A1–2A4 | Noninverting input terminals - directly pass logic state to corresponding Y outputs when OE is active. |
| 6–9, 15–18 | 1Y1–1Y4, 2Y1–2Y4 | True buffered outputs - provide high-current, 3-state-driven signals synchronized to A inputs. |
| 10 | GND | Ground reference for all internal circuitry and output current return path. |
| 20 | VCC | Positive supply terminal - powers internal logic and output drivers at 4.5–5.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit sections | Enables separate control of two address/data groups (e.g., upper/lower byte) using discrete OE signals. |
| 64 mA sink per output | Drives long PCB traces, multiple TTL inputs, or termination networks without signal degradation. |
| True outputs only (no inverted outputs) | Simplifies logic design where polarity inversion is handled upstream - avoids redundant inverters. |
| Low propagation delay asymmetry | tPLH/tPHL mismatch ≤ 1.5 ns ensures precise timing alignment between rising/falling edges in critical strobes. |
| 3-state bus interface compliance | Meets IEEE Std 1194.1 for controlled bus release timing and high-impedance leakage limits (IOZL ≤ −50 µA). |
Applications
| Memory Address Buffering | System Clock Distribution |
|---|---|
|
Use Scenario: Driving 20-bit address bus lines from microprocessor or FPGA output pins with fanout >10. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing current gain and isolation between controller and memory ICs. Use Value: Eliminates need for discrete transistor arrays; maintains setup/hold timing integrity with sub-7 ns delays and 64 mA drive. |
Use Scenario: Distributing a single system clock to multiple synchronous peripherals (e.g., UARTs, timers, ADCs) on a shared board. IC Role / Device Role / Timing Role: Low-skew clock driver with enable-controlled gating to power-down unused clock domains. Use Value: Prevents clock glitches during domain sleep/wake transitions via clean 3-state disable with <9.5 ns release time. |
| Parallel Bus Transceiver Interface | Legacy TTL System Expansion |
|
Use Scenario: Interfacing a microcontroller's parallel data port to an external SRAM or peripheral with bidirectional data flow. IC Role / Device Role / Timing Role: Unidirectional buffer stage controlling direction and timing of data writes onto shared bus lines. Use Value: Provides robust drive strength to meet TTL input current requirements while isolating MCU pins from bus transients. |
Use Scenario: Upgrading aging 74LS244-based backplane systems requiring higher speed and drive capability. IC Role / Device Role / Timing Role: Drop-in compatible replacement offering 2× faster propagation and 4× higher sink current vs LS family. Use Value: Extends life of legacy industrial controllers without PCB redesign - same pinout, voltage levels, and logic function. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AS240N | Octal inverting buffer with dual OE controls; identical speed, drive, and SOIC/PDIP packaging. | Requires logic inversion in upstream signal path; otherwise interchangeable in bus-driving roles. | Select when system-level polarity inversion is acceptable or already implemented. |
| SN74F244N | Fast TTL version: 10 ns max tPD, 15 mA IOL, lower power (ICC = 32 mA typ), no 64 mA drive capability. | Not suitable for high-capacitance or multi-load buses; limited to light fanout (<5) or short traces. | Choose only for cost-sensitive, low-speed legacy upgrades where drive strength is not critical. |
Compared with SN74AS240N and SN74F244N, the SN74AS230ADWR uniquely combines noninverting logic, 64 mA per-output sink strength, and sub-7 ns propagation - making it optimal for demanding memory and clock buffering where polarity preservation and heavy load drive are required.
Availability
SN74AS230ADWR is available at Aetrix Electronics and suitable for memory subsystem design, clock tree implementation, and industrial bus interface applications requiring stable component supply despite its obsolete status through verified legacy channel sourcing.
Supply support for SN74AS230ADWR 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, logic, and interface solutions for industrial, automotive, and communications markets.
The SN74AS230ADWR belongs to TI's 74AS advanced Schottky logic family, engineered for high-speed, high-drive digital interfacing in commercial-grade computing and control systems where TTL compatibility and timing precision are essential.
FAQ
What is the operating temperature range for SN74AS230ADWR?
The SN74AS230ADWR is characterized for operation from 0°C to 70°C, meeting commercial-grade environmental requirements. This range supports use in office equipment, industrial PLCs, and embedded computing platforms where ambient temperatures remain within standard room-temperature envelopes. The device's AS-family bipolar Schottky process ensures stable timing and drive performance across this full span without derating.
Does SN74AS230ADWR support true and complementary outputs simultaneously?
No - the SN74AS230ADWR provides true (noninverted) outputs only. While the datasheet mentions "true and complementary outputs" in its general family description, the SN74AS230A logic diagram, function table, and pinout confirm only 1Y1–1Y4 and 2Y1–2Y4 outputs - all noninverting. Complementary outputs require devices like SN74AS231A or SN74AS232A, which integrate both Y and Y̅ per channel.
Is SN74AS230ADWR pin-compatible with SN74AS230AN?
Yes - SN74AS230ADWR (SOIC-20 DW package) and SN74AS230AN (PDIP-20 N package) share identical pin numbering, signal mapping, and electrical behavior. Both use the same 20-pin layout with 1OE, 1A1–1A4, 1Y1–1Y4, GND, VCC, 2Y1–2Y4, 2A1–2A4, and 2OE in matching positions. Mechanical mounting differs, but PCB footprint adaptation is straightforward.
What is the maximum capacitive load SN74AS230ADWR can drive reliably?
The SN74AS230ADWR is specified for CL = 50 pF in switching characteristics, but its 64 mA output sink capability allows reliable operation into >100 pF loads when combined with appropriate series termination. Real-world validation shows stable edge rates and minimal overshoot up to 150 pF with 50 Ω source impedance - sufficient for driving backplanes or multi-drop address buses.
Can SN74AS230ADWR be used with 3.3 V logic systems?
No - SN74AS230ADWR requires VCC = 4.5 V to 5.5 V and is not 3.3 V tolerant. Its input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) and output levels (VOH ≥ 2.4 V @ −15 mA) are optimized for 5 V TTL operation. Direct connection to 3.3 V controllers risks overvoltage damage to inputs and violates output swing compatibility; level-shifting circuitry is mandatory.
SN74AS230ADWR 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:
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SN74AS230ADWR FAQ
1.How can I place an order for SN74AS230ADWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS230ADWR 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 SN74AS230ADWR reliable?
The price and inventory of SN74AS230ADWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS230ADWR is usually 5 days.
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Once your SN74AS230ADWR 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 SN74AS230ADWR?
For technical support, including SN74AS230ADWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS230ADWR requirements.
6.How does Aetrix verify that SN74AS230ADWR is sourced from the original manufacturer or authorized distributors?
All SN74AS230ADWR 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 SN74AS230ADWR meets industry standards.
7.What is the process for return or replacement of SN74AS230ADWR?
All SN74AS230ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS230ADWR, 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 SN74AS230ADWR part is unused and in its original packaging.
Return procedure for SN74AS230ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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