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Texas Instruments SN74ALS29863DWE4
- Part No.:
- SN74ALS29863DWE4
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS29863DWE4.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,664
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Product details
Overview
SN74ALS29863DWE4 from Texas Instruments is a 9-bit bidirectional transceiver with independent A→B and B→A enable controls (OEAB1/OEAB2/OEBA1/OEBA2), 5 V supply operation, ±24 mA high-level/48 mA low-level output drive, and 0°C to 70°C temperature range - used in asynchronous bus interfacing between microprocessor and peripheral data buses.
For engineers reviewing the SN74ALS29863DWE4 datasheet, SN74ALS29863DWE4 pinout, SN74ALS29863DWE4 application, or SN74ALS29863DWE4 equivalent, key selection factors include dual-directional control granularity, TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V), 3-state isolation timing (tPZL = 15 ns at CL = 50 pF), and SOIC-24 package compatibility with legacy board layouts.
Technical Context
This device implements two independent 9-bit bidirectional data paths with four separate 3-state enable inputs, allowing simultaneous latching of both A and B buses (all OE low) or selective unidirectional transfer (e.g., OEAB1/OEAB2 low for A→B; OEBA1/OEBA2 low for B→A). It uses bipolar ALS logic for improved speed over standard TTL while maintaining pin compatibility with industry-standard 9-bit transceivers.
Propagation delays are specified at 15 ns (tPLH/tPHL, CL = 50 pF) and 8 ns (tPLH/tPHL, CL = 5 pF); enable/disable times range from 9 ns to 23 ns depending on load and transition direction. The device features power-up high-impedance outputs and supports up to 300 pF capacitive loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - enables faster switching than standard TTL with lower power consumption. |
| Supply Voltage | 4.75 V to 5.25 V - requires tightly regulated 5 V rail; not compatible with 3.3 V systems without level translation. |
| Output Drive | IOH = −24 mA / IOL = 48 mA - sufficient to drive multiple TTL loads or moderate PCB traces without buffering. |
| Input Thresholds | VIH = 2 V min / VIL = 0.8 V max - ensures reliable recognition of standard TTL logic levels. |
| Propagation Delay | tPLH/tPHL = 15 ns @ CL = 50 pF - supports synchronous bus operation up to ~33 MHz in short-trace configurations. |
| Enable Timing | tPZL = 15 ns / tPHZ = 9 ns @ CL = 5 pF - enables fast bus arbitration and dynamic direction switching. |
| Operating Temperature | 0°C to 70°C - rated for commercial-grade applications; not qualified for extended industrial or automotive environments. |
Pinout & Package
SN74ALS29863DWE4 is packaged in a 24-pin SOIC (DW) body with 300-mil width, 1.27 mm pitch, and RoHS-compliant NiPdAu lead finish. Moisture sensitivity level is Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OEBA1 | Active-low enable for B→A data path (pins B1–B9 → A1–A9); independent of OEBA2. |
| 2 | A1 | Input/output terminal of A-side 9-bit bus; bidirectional when corresponding OE is asserted. |
| 3–9 | A2–A8 | Additional A-side I/O pins; collectively form 9-bit A bus with A1 and A9. |
| 10 | A9 | Ninth bit of A-side bus; shares same 3-state control logic as A1–A8. |
| 11 | OEBA2 | Second active-low enable for B→A path; OR'd internally with OEBA1 for full B→A activation. |
| 12 | GND | Ground reference for all internal circuitry and I/O; must be low-impedance connection. |
| 13 | VCC | +5 V supply input; decoupling capacitor (0.1 µF ceramic) required adjacent to pin. |
| 14–22 | B1–B9 | B-side 9-bit I/O bus; driven from A side when OEAB1/OEAB2 active, or drive A side when OEBA1/OEBA2 active. |
| 23 | OEAB2 | Second active-low enable for A→B path; OR'd with OEAB1 to activate full A→B transfer. |
| 24 | OEAB1 | Primary active-low enable for A→B data path (A1–A9 → B1–B9); independent of OEAB2. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent direction control | Separate OEABx and OEBAx inputs allow concurrent A→B and B→A transfers or isolated bus latching - eliminates need for external direction logic. |
| Power-up 3-state | Outputs remain high-impedance until VCC stabilizes - prevents bus contention during system power sequencing. |
| TTL-compatible interface | Meets standard TTL voltage thresholds and fan-out capability (up to 20 LSTTL loads), enabling drop-in replacement in legacy designs. |
| Low propagation delay | 15 ns max delay at 50 pF load supports high-speed parallel bus operation without added wait states in microcontroller systems. |
| SOIC-24 packaging | Standard 300-mil SOIC footprint allows use in space-constrained industrial control and test equipment without redesigning PCB layout. |
Applications
| Industrial PLC Backplane Interface | Legacy Microprocessor Bus Extension |
|---|---|
|
Use Scenario: Interfacing a 16-bit microprocessor data bus to a modular I/O backplane with separate address/data lanes. IC Role / Device Role / Timing Role: Bidirectional data transceiver managing time-multiplexed A/B bus handshaking under DMA control. Use Value: Independent OEAB/OEBA enables precise timing of read/write bursts without direction-control overhead, reducing CPU intervention. |
Use Scenario: Extending an 8086/8088-based system with additional memory or peripheral cards using shared ISA-like bus architecture. IC Role / Device Role / Timing Role: Level-shifting and direction-controlled buffer between CPU local bus and expansion bus segments. Use Value: 48 mA sink current drives long trace runs and multiple TTL inputs; 15 ns delay avoids timing violations in 8-MHz bus cycles. |
| Test Equipment Data Capture Module | Automated Test Fixture Bus Arbitration |
|
Use Scenario: Capturing parallel digital signals from DUTs into FPGA-based acquisition logic with configurable bus width. IC Role / Device Role / Timing Role: Isolating and conditioning captured data before latching into FIFO buffers. Use Value: Power-up high-Z state prevents signal corruption during fixture initialization; latch mode holds data stable for analysis. |
Use Scenario: Managing shared JTAG or boundary-scan bus among multiple test instruments in a rack-mounted ATE system. IC Role / Device Role / Timing Role: Direction-selectable repeater enabling multi-drop bus topology with controlled signal integrity. Use Value: 9-bit width matches common scan chain widths; fast enable/disable (9 ns tPHZ) supports dynamic instrument switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 9-bit bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29863 | Functionally identical per TI documentation; identical pinout, timing, and DC specs; manufactured by AMD with same ALS process. | No functional difference; used interchangeably in legacy military/aerospace designs where AMD sourcing was preferred. | Select AM29863 only if legacy qualification or dual-sourcing requirements mandate AMD part number traceability. |
| SN74AS29863 | Faster propagation (8 ns vs. 15 ns @ 50 pF) and higher drive (−2 mA IOH, 20 mA IOL), but higher ICC (100 mA typical) and no power-up high-Z. | Suitable for high-speed bus extensions where timing margin is critical, but requires careful power sequencing design. | Choose SN74AS29863 only when 33% speed improvement justifies increased power and loss of power-up isolation. |
Compared with AM29863 and SN74AS29863, the SN74ALS29863DWE4 offers optimal balance of speed, power efficiency, and robust power-on behavior - making it the preferred choice for commercial and industrial bus interface applications requiring reliability over peak performance.
Availability
SN74ALS29863DWE4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy microprocessor bus extensions, and automated test equipment requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS29863DWE4 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.
The SN74ALS29863DWE4 belongs to TI's legacy 74ALS logic family, designed specifically for high-reliability, medium-speed parallel bus interfacing in commercial and industrial control systems.
FAQ
What is the function of OEAB1 and OEAB2 on the SN74ALS29863DWE4?
OEAB1 and OEAB2 are active-low enables for the A→B data path. Either input asserted low activates A→B transfer; both must be high to disable that direction. This dual-enable structure provides redundancy and flexible control logic routing in complex bus architectures. The SN74ALS29863DWE4 uses internal OR logic so asserting either OEAB1 or OEAB2 alone enables full 9-bit A→B transmission.
Does the SN74ALS29863DWE4 support 3.3 V operation?
No, the SN74ALS29863DWE4 is strictly a 5 V device with recommended VCC of 4.75 V to 5.25 V. Its ALS logic thresholds and output drive characteristics are incompatible with 3.3 V signaling. Using it with 3.3 V supplies risks undefined operation, excessive ICC, or permanent damage. For mixed-voltage systems, level translators must be used upstream or downstream of the SN74ALS29863DWE4.
Is the SN74ALS29863DWE4 pin-compatible with the SN74LS245?
No, the SN74ALS29863DWE4 is not pin-compatible with the SN74LS245. While both are 8-bit transceivers, the SN74ALS29863DWE4 is a 9-bit device in a 24-pin SOIC with four independent OE inputs and different pin assignments (e.g., OEBA1 at pin 1, GND at pin 12). The SN74LS245 uses an 8-pin DIP or 20-pin SOIC package with only two OE inputs and no B9/A9 terminals.
What does "power-up high-impedance state" mean for the SN74ALS29863DWE4?
"Power-up high-impedance state" means all I/O pins (A1–A9 and B1–B9) remain in 3-state (high-Z) until VCC reaches a valid operating level and internal bias circuits stabilize - typically within microseconds after VCC exceeds ~3 V. This prevents bus contention during power ramp-up. The SN74ALS29863DWE4 guarantees this behavior across its full 0°C to 70°C operating range without external reset circuitry.
Can the SN74ALS29863DWE4 be used in place of the AM29863?
Yes, the SN74ALS29863DWE4 is functionally equivalent to the AM29863 per TI's official documentation and shares identical pinout, timing, DC electrical specs, and package dimensions. Both devices meet the same ALS logic family standards and may be substituted one-for-one in existing designs. The SN74ALS29863DWE4 is TI's second-source version of the AM29863, with full cross-reference validation.
SN74ALS29863DWE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 9
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 48mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74ALS29863DWE4 FAQ
1.How can I place an order for SN74ALS29863DWE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS29863DWE4 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 SN74ALS29863DWE4 reliable?
The price and inventory of SN74ALS29863DWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS29863DWE4 is usually 5 days.
3.What payment methods are accepted for SN74ALS29863DWE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS29863DWE4 transactions.
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4.How is shipping managed for SN74ALS29863DWE4?
SN74ALS29863DWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS29863DWE4 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 SN74ALS29863DWE4?
For technical support, including SN74ALS29863DWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS29863DWE4 requirements.
6.How does Aetrix verify that SN74ALS29863DWE4 is sourced from the original manufacturer or authorized distributors?
All SN74ALS29863DWE4 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 SN74ALS29863DWE4 meets industry standards.
7.What is the process for return or replacement of SN74ALS29863DWE4?
All SN74ALS29863DWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS29863DWE4, 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 SN74ALS29863DWE4 part is unused and in its original packaging.
Return procedure for SN74ALS29863DWE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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