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Texas Instruments SN74ALS29863DWR
- Part No.:
- SN74ALS29863DWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS29863DWR.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,779
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Product details
Overview
SN74ALS29863DWR from Texas Instruments is a 9-bit bidirectional transceiver with independent A→B and B→A data paths, four output-enable controls (OEAB1/OEAB2/OEBA1/OEBA2), ±24 mA high-level/48 mA low-level drive capability, and guaranteed operation from 0°C to 70°C. It enables asynchronous bus communication in industrial backplane systems requiring latchable or isolated bus states.
For engineers reviewing the SN74ALS29863DWR datasheet, SN74ALS29863DWR pinout, SN74ALS29863DWR application, or SN74ALS29863DWR equivalent, key selection criteria include its dual-directional enable logic, 300-pF load-compatible propagation delays (tPLH/tPHL ≤15 ns), and SOIC-24 package compatibility with legacy 300-mil DIP footprints.
Technical Context
This device implements TTL-compatible 9-bit bidirectional data transfer using discrete OEAB and OEBA control pairs - enabling simultaneous A-to-B and B-to-A operation only when respective enables are active low. Latch mode (all OEs low) holds both buses in their last state without external clocking.
It operates strictly within 4.75 V–5.25 V supply range and supports three-state isolation via any single OE input high. Output voltage levels meet ALS-family specs: VOH ≥2.0 V at −24 mA, VOL ≤0.5 V at 48 mA, with VIH = 2.0 V and VIL = 0.8 V for noise margin compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bus Width | 9-bit bidirectional data path (A1–A9 ↔ B1–B9) |
| Supply Voltage | 4.75 V to 5.25 V - requires stable 5 V rail; no wide-VCC tolerance |
| Output Drive | −24 mA (IOH) / +48 mA (IOL) - supports direct TTL loading without buffers |
| Propagation Delay | ≤15 ns (CL = 50 pF) - suitable for sub-50 MHz asynchronous bus timing |
| Enable Isolation | tPZL ≤15 ns, tPHZ ≤9 ns - fast 3-state entry/exit for dynamic bus sharing |
| Operating Temperature | 0°C to 70°C - commercial-grade rating; not rated for extended industrial range |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - compatible with standard TTL logic families |
Pinout & Package
SN74ALS29863DWR uses a 24-pin SOIC (DW) package with 300-mil body width, 1.27 mm pitch, and gull-wing leads. Pin 1 is marked by a beveled corner or notch; pin numbering follows standard top-view counterclockwise layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OEBA1 | Active-low enable for B→A direction on channels 1–9 |
| 2–10 | A1–A9 | 9-bit A-side bidirectional I/O port (shared with B-side via transceiver logic) |
| 11 | OEBA2 | Active-low secondary enable for B→A direction (redundant control per function table) |
| 12 | GND | Power ground reference for all internal logic and I/O stages |
| 13 | VCC | +5 V supply input - decoupling capacitor required within 1 cm |
| 14–22 | B1–B9 | 9-bit B-side bidirectional I/O port (mirrored A-port functionality) |
| 23 | OEAB2 | Active-low secondary enable for A→B direction |
| 24 | OEAB1 | Active-low primary enable for A→B direction on channels 1–9 |
Key Features
| Feature | Design Value |
|---|---|
| Independent Direction Control | Separate OEABx and OEBAx inputs allow concurrent A→B and B→A transfers without bus contention |
| Latch Mode | All four OE inputs low freezes both A and B bus states - eliminates need for external latches |
| Power-Up High-Z | Outputs remain in high-impedance state until VCC stabilizes and first valid OE signal is applied |
| TTL-Compatible Interface | Meets ALS family VIH/VIL, VOH/VOL, and drive strength specs - interoperable with 74LS/74ALS logic |
| SOIC-24 Footprint | Pin-compatible with industry-standard 24-pin SOIC carriers and reflow profiles (MSL Level-1) |
Applications
| Industrial Backplane Interfacing | Legacy System Bus Extension |
|---|---|
|
Use Scenario: Connecting two isolated 9-bit parallel buses across a long PCB trace or connector in programmable logic controller (PLC) chassis. IC Role / Device Role / Timing Role: Bidirectional level-shifting and timing-isolated bus repeater with latch hold during CPU interrupt servicing. Use Value: Eliminates need for separate direction-control logic and external latches while maintaining <15 ns inter-bus skew. |
Use Scenario: Extending an aging 8086/8088-based system's data bus to add new peripheral modules without modifying motherboard layout. IC Role / Device Role / Timing Role: Asynchronous bus transceiver providing A→B or B→A flow under software-controlled OE signals. Use Value: Enables hot-plug-capable expansion slots using existing 5 V TTL signaling and SOIC footprint compatibility. |
| Test Equipment Data Routing | Redundant Control Signal Distribution |
|
Use Scenario: Switching measurement data between multiple analog front-end channels and a central ADC/DAC interface in automated test equipment. IC Role / Device Role / Timing Role: Reconfigurable 9-bit data path selector with independent enable control per direction. Use Value: Supports deterministic routing of calibration or stimulus signals without clock synchronization overhead. |
Use Scenario: Distributing identical safety-critical control bits (e.g., emergency stop flags) across dual-redundant microcontroller subsystems. IC Role / Device Role / Timing Role: Fault-tolerant bidirectional repeater that maintains signal integrity during partial failure modes. Use Value: Provides galvanically isolated bus coupling with latch-mode retention during transient power faults. |
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 |
|---|---|---|---|
| SN74AS29863DW | Faster propagation (tPLH/tPHL ≤ 6 ns @ CL=50 pF); higher ICC (85 mA typical); AS-family input thresholds (VIH=2.5 V) | Requires tighter VCC regulation and higher drive capability; unsuitable for mixed-ALS/LS systems | Select when sub-10 ns timing is critical and power budget allows +20 mA quiescent draw |
| AM29863PC | Identical function and pinout; same 0°C–70°C range; plastic DIP-24 package only (no SOIC option) | Larger footprint; incompatible with surface-mount assembly; higher thermal resistance | Choose only for through-hole prototyping or legacy DIP-based repair scenarios |
Compared with SN74ALS29863DWR, SN74AS29863DW delivers faster switching but demands stricter supply stability and consumes more current, while AM29863PC offers functional equivalence in through-hole form but lacks SOIC manufacturability and thermal performance.
Availability
SN74ALS29863DWR is available at Aetrix Electronics and suitable for industrial backplane interfacing, legacy system bus extension, test equipment data routing, and redundant control signal distribution requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS29863DWR 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 company founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial and automotive portfolio coverage.
The SN74ALS29863DWR belongs to TI's legacy 74ALS logic family, designed specifically for high-reliability, asynchronous 9-bit bus bridging in commercial-temperature industrial control and instrumentation systems.
FAQ
What is the maximum capacitive load SN74ALS29863DWR can drive while maintaining specified timing?
The SN74ALS29863DWR is characterized for CL = 50 pF (tPLH/tPHL ≤ 8 ns) and CL = 300 pF (tPLH/tPHL ≤ 15 ns). Driving loads beyond 300 pF risks violating propagation delay specs and may cause output waveform degradation. For >300 pF traces or connectors, buffer stages or series termination are recommended. The SN74ALS29863DWR does not specify performance above 300 pF in its official characterization.
Does SN74ALS29863DWR support true bidirectional operation on the same pins without external direction control logic?
Yes - the SN74ALS29863DWR integrates dual-directional control via dedicated OEABx (A→B) and OEBAx (B→A) inputs. Each direction operates independently: asserting OEAB1/OEAB2 low enables A-to-B flow while OEBA1/OEBA2 remain high (and vice versa), eliminating need for external direction-select gates or microcontroller GPIO coordination.
Is SN74ALS29863DWR pin-compatible with AM29863 devices?
Yes - the SN74ALS29863DWR is functionally and pin-compatible with AMD's AM29863, including identical pin assignments, electrical behavior, and timing specifications. TI explicitly states "Functionally Equivalent to AMD's AM29863" in the datasheet, confirming drop-in replacement capability in SOIC-24 layouts.
What happens to outputs during power-up before VCC reaches regulation?
The SN74ALS29863DWR features a power-up high-impedance state: all outputs remain in 3-state (high-Z) until VCC exceeds ~4.5 V and stabilizes. This prevents bus contention or undefined logic states during power-rail ramp-up. No external reset or enable sequencing is required - the SN74ALS29863DWR manages this internally.
Can SN74ALS29863DWR operate reliably at 4.75 V supply voltage?
Yes - the SN74ALS29863DWR is fully specified down to 4.75 V: VOH ≥2.0 V at −24 mA, VOL ≤0.5 V at 48 mA, and tPLH/tPHL ≤15 ns (CL = 300 pF) are all guaranteed at VCC = 4.75 V. Operation below 4.75 V is outside recommended conditions and may result in timing violations or reduced noise margins.
SN74ALS29863DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
SN74ALS29863DWR FAQ
1.How can I place an order for SN74ALS29863DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS29863DWR 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 SN74ALS29863DWR reliable?
The price and inventory of SN74ALS29863DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS29863DWR is usually 5 days.
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SN74ALS29863DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS29863DWR 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 SN74ALS29863DWR?
For technical support, including SN74ALS29863DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS29863DWR requirements.
6.How does Aetrix verify that SN74ALS29863DWR is sourced from the original manufacturer or authorized distributors?
All SN74ALS29863DWR 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 SN74ALS29863DWR meets industry standards.
7.What is the process for return or replacement of SN74ALS29863DWR?
All SN74ALS29863DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS29863DWR, 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 SN74ALS29863DWR part is unused and in its original packaging.
Return procedure for SN74ALS29863DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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