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Texas Instruments SN74BCT29834DWR
- Part No.:
- SN74BCT29834DWR
- Manufacturer:
- Texas Instruments
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SN74BCT29834DWR.pdf
- Description:
- BUS TRANSCEIVER
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Product details
Overview
SN74BCT29834DWR from Texas Instruments is an 8-bit to 9-bit BiCMOS bus transceiver with integrated odd-parity generator and checker, operating at 4.5–5.5 V, supporting asynchronous A↔B data transfer with error-flag latching via CLK and CLR, used in legacy TTL-compatible backplane and memory subsystems.
For engineers reviewing the SN74BCT29834DWR datasheet, SN74BCT29834DWR pinout, SN74BCT29834DWR application, or SN74BCT29834DWR equivalent, key selection considerations include open-collector ERR output timing (tPLH ≤ 12 ns), flow-through pinout isolation, inverted-parity diagnostic mode, and DW-package thermal limits (0°C to 70°C).
Technical Context
The SN74BCT29834DWR implements a dual-directional 8-bit transceiver with parity logic: A→B path generates odd parity on PARITY; B→A path checks parity and asserts ERR if mismatched. The ERR flag is edge-triggered into a register by CLK and cleared asynchronously by CLR.
It uses BiCMOS process for TTL-compatible inputs/outputs and reduced standby current, supports flow-through pinout (inputs on one side, outputs on opposite), and provides inverted-parity mode (OEA=OEB=L) for forced error diagnostics-distinct from standard parity operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with 5-V TTL bus systems without level-shifting. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade board-level applications, not extended industrial or automotive. |
| ERR Propagation Delay | tPLH(CLK→ERR) ≤ 12 ns - enables high-speed parity error capture in synchronous bus monitoring. |
| Output Drive (IOL) | 48 mA sink per output - sufficient to drive multiple TTL loads or pull-down termination networks. |
| Parity Logic | Odd-parity generation/checking - ensures single-bit error detection across 8 data + 1 parity bit paths. |
| Input Compatibility | TTL-level VIH ≥ 2.0 V, VIL ≤ 0.8 V - interoperable with standard 74LS/74ALS logic families. |
| Standby ICC | ICCL = 55–80 mA (active), ICCZ = 30–45 mA (3-state) - BiCMOS reduces quiescent power vs. bipolar-only equivalents. |
Pinout & Package
SN74BCT29834DWR is housed in a 24-pin SOIC (DW) package with 300-mil width, gull-wing leads, and standard JEDEC MS-013AC footprint. Pin 1 is marked by beveled corner or dot; device orientation follows top-view labeling shown in datasheet Figure 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OEA | A-side output enable | Active-low control enabling A→B data flow and PARITY generation; disables A outputs when high. |
| OEB | B-side output enable | Active-low control enabling B→A data flow and parity checking; disables B outputs when high. |
| CLR | Error-flag register clear | Asynchronous active-low reset of ERR latch; forces ERR high regardless of parity state. |
| CLK | Error-flag clock | Rising-edge sampling of parity result into ERR register; synchronizes error reporting to system clock domain. |
| PARITY | Generated odd-parity output | Open-drain output reflecting odd parity of A1–A8; pulled high externally for wired-OR error aggregation. |
| ERR | Parity-error flag | Open-collector output asserted low when B1–B8 + PARITY mismatch; latched on CLK↑ and cleared by CLR↓. |
| A1–A8 | A-bus data inputs/outputs | Bidirectional I/O ports for A-side bus; driven when OEA low, high-impedance when OEA high. |
| B1–B8 | B-bus data inputs/outputs | Bidirectional I/O ports for B-side bus; driven when OEB low, high-impedance when OEB high. |
| GND | Ground reference | Primary return path for all internal logic and I/O; requires low-impedance PCB plane connection. |
| VCC | Power supply | +5 V supply input; bypass capacitor (0.1 µF ceramic) required near pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Reduces ICCZ standby current to 30–45 mA versus >100 mA in equivalent bipolar TTL parts, lowering system power density. |
| Flow-through pinout | Inputs (A1–A8, OEA, OEB, CLK, CLR) on left side; outputs (B1–B8, PARITY, ERR) on right - simplifies PCB routing and minimizes signal crosstalk. |
| Inverted-parity diagnostic mode | When OEA=OEB=L, forces ERR assertion regardless of data - enables hardware-level bus integrity testing without software intervention. |
| Open-collector ERR and PARITY | Supports wired-OR connection of multiple SN74BCT29834DWR devices onto a shared error bus, reducing system-level interrupt lines. |
| Functionally equivalent to SN74ALS29834 | Direct drop-in replacement for legacy ALS-based designs, preserving timing margins and layout while improving power efficiency. |
Applications
| Backplane Data Integrity Monitoring | Legacy Memory Subsystem Parity |
|---|---|
Use Scenario: Monitoring bidirectional data transfers across a 24-bit VMEbus or Multibus II backplane where parity errors must be captured and logged in real time. IC Role / Device Role / Timing Role: SN74BCT29834DWR acts as a parity-aware transceiver, generating odd parity on write cycles and checking parity on read cycles, with ERR latched on CLK edge for CPU interrupt synchronization. Use Value: Enables deterministic error detection latency (≤12 ns propagation + setup/hold compliance) and eliminates need for external latch or glue logic in parity-handling path. | Use Scenario: Providing parity generation and checking between a 68000 CPU and dual-ported SRAM banks in industrial controller firmware updates. IC Role / Device Role / Timing Role: SN74BCT29834DWR interfaces CPU address/data bus to memory module, generating parity during writes and validating it during reads, with ERR flag routed to NMI line. Use Value: Guarantees single-bit error detection across 8-bit data paths using hardware logic only - no CPU overhead or firmware latency. |
| Diagnostic Mode for Field Service | TTL-Compatible Bus Isolation |
Use Scenario: Enabling field technicians to verify physical bus continuity and driver/receiver functionality during maintenance of telecom line cards. IC Role / Device Role / Timing Role: SN74BCT29834DWR placed in inverted-parity mode (OEA=OEB=L) to force ERR assertion, confirming end-to-end signal path integrity from A to B pins. Use Value: Provides hardware-level go/no-go test without requiring test patterns or host processor involvement - reduces service time by >60%. | Use Scenario: Electrically isolating two 5-V TTL buses during hot-swap events or power sequencing in modular instrumentation racks. IC Role / Device Role / Timing Role: SN74BCT29834DWR configured with OEA=OEB=H to place both A and B ports in high-impedance state, preventing back-driving or contention during power transitions. Use Value: Achieves clean bus isolation with <1 µs transition time and no leakage current path - meets MIL-STD-1553B isolation requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit parity transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS29834N | Bipolar TTL process; higher ICC (120 mA typical), slower tPLH (15 ns), same pinout and logic function. | Valid for legacy boards where BiCMOS thermal/power advantages are not required; not RoHS-compliant. | Select when replacing failed units on existing ALS-based PCBs with unchanged thermal design. |
| Am29834PC | AMD second-source part; identical timing and electrical specs per datasheet, same DW/NT packaging options. | Drop-in functional replacement with identical timing and pinout; subject to AMD's discontinuation status and sourcing constraints. | Prefer when TI supply is constrained but AMD channel inventory is available and traceability is verified. |
Compared with SN74ALS29834N and Am29834PC, the SN74BCT29834DWR delivers lower power consumption (45 mA vs. 120 mA standby), faster ERR assertion (12 ns vs. 15 ns), and BiCMOS reliability - making it optimal for thermally dense or power-sensitive legacy upgrades.
Availability
SN74BCT29834DWR is available at Aetrix Electronics and suitable for legacy system repair, industrial controller refurbishment, and military avionics sustainment programs requiring stable component supply amid obsolescence challenges.
Supply support for SN74BCT29834DWR 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 for industrial, automotive, and communications markets.
The SN74BCT29834DWR belongs to TI's BCT-series BiCMOS logic family, designed specifically to replace high-power TTL transceivers in 5-V bus systems while maintaining full pin and function compatibility.
FAQ
What is the primary function of the SN74BCT29834DWR in a data bus system?
The SN74BCT29834DWR serves as an 8-bit bidirectional transceiver with integrated odd-parity generation and checking. It transfers data between A and B buses while generating parity on A→B writes and verifying parity on B→A reads. Its ERR output flags mismatches, and the register latches errors on CLK edges - making SN74BCT29834DWR essential for hardware-level data integrity in legacy 5-V systems.
Does the SN74BCT29834DWR support true bidirectional operation without external direction control?
Yes - the SN74BCT29834DWR uses separate active-low output enables (OEA and OEB) to independently control direction: OEA low enables A→B transfer with parity generation; OEB low enables B→A transfer with parity checking. Both enables high places all I/Os in high-impedance state, providing full bus isolation. No external direction line is needed - SN74BCT29834DWR manages direction internally via enable logic.
What is the purpose of the inverted-parity mode (OEA=OEB=L) in the SN74BCT29834DWR?
The inverted-parity mode forces the SN74BCT29834DWR to assert ERR regardless of actual data or parity values - creating a deterministic error condition. This mode is used for hardware diagnostics, such as verifying ERR signal path integrity, testing interrupt handling, or validating bus wiring continuity without relying on specific data patterns. It is a built-in feature unique to SN74BCT29834DWR and not present in basic transceivers.
Can the SN74BCT29834DWR be used in new designs today?
The SN74BCT29834DWR is marked OBSOLETE by Texas Instruments and is not recommended for new designs. It remains available for legacy system repair and long-life support programs. New designs should consider modern alternatives with enhanced features, wider voltage ranges, or improved power efficiency - unless strict pin-and-function compatibility with existing 5-V TTL infrastructure is mandatory for the SN74BCT29834DWR.
What are the absolute maximum ratings that define safe operating limits for the SN74BCT29834DWR?
The SN74BCT29834DWR has an absolute maximum VCC of 7 V, input voltage limit of 7 V, and disabled I/O port voltage tolerance of 5.5 V. Exceeding these may cause permanent damage. Its operating temperature range is 0°C to 70°C, and storage range is −65°C to 150°C. These ratings ensure robustness in commercial environments but preclude use in extended industrial or automotive applications - critical context for SN74BCT29834DWR integration.
SN74BCT29834DWR Specifications
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- Manufacturer:
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SN74BCT29834DWR FAQ
1.How can I place an order for SN74BCT29834DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT29834DWR 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 SN74BCT29834DWR reliable?
The price and inventory of SN74BCT29834DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT29834DWR is usually 5 days.
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Once your SN74BCT29834DWR 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 SN74BCT29834DWR?
For technical support, including SN74BCT29834DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT29834DWR requirements.
6.How does Aetrix verify that SN74BCT29834DWR is sourced from the original manufacturer or authorized distributors?
All SN74BCT29834DWR 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 SN74BCT29834DWR meets industry standards.
7.What is the process for return or replacement of SN74BCT29834DWR?
All SN74BCT29834DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT29834DWR, 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 SN74BCT29834DWR part is unused and in its original packaging.
Return procedure for SN74BCT29834DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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