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Texas Instruments SN74BCT29862BNT
- Part No.:
- SN74BCT29862BNT
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74BCT29862BNT.pdf
- Description:
- BUS TRANSCEIVER
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Product details
Overview
SN74BCT29862B from Texas Instruments is a 10-bit BiCMOS bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between two 10-bit buses. It supports A-to-B and B-to-A direction control via independent OEAB/OEBA inputs, operates at 4.5–5.5 V, delivers ±48 mA output drive, and features power-up high-impedance state for hot-insertion safety in industrial backplane interfaces.
For engineers reviewing the SN74BCT29862B datasheet, SN74BCT29862B pinout, SN74BCT29862B application, or SN74BCT29862B equivalent, key selection criteria include its dual-directional 3-state control logic, military-grade ESD protection (>2000 V), low standby current, and compatibility with legacy TTL/LS bus systems requiring robust signal integrity and timing flexibility.
Technical Context
This device implements independent enable-controlled bidirectional data flow using two active-low output-enable inputs (OEAB and OEBA) to select direction or isolate buses. Its BiCMOS architecture combines bipolar switching speed with CMOS low-power standby, enabling sub-10 ns propagation delays (tPLH/tPHL ≤ 6.1 ns) and fast output enable/disable transitions (tPZH/tPLZ ≤ 12.5 ns).
The transceiver maintains high-impedance outputs during power-up/down, preventing bus contention. It supports 5-V TTL-compatible signaling with VIH = 2 V, VIL = 0.8 V, VOH ≥ 2.4 V (IOH = –24 mA), and VOL ≤ 0.5 V (IOL = 48 mA), meeting standard LS-TTL interface requirements while offering improved drive strength and noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and LS logic rails without level-shifting. |
| Output Drive | ±48 mA - provides sufficient current to drive multiple LS-TTL loads (up to 20) on shared bus segments. |
| Propagation Delay | ≤ 6.1 ns (max, VCC = 4.5 V) - enables reliable operation in high-speed backplane and memory-mapped I/O timing budgets. |
| ESD Protection | >2000 V per Mil-STD-883C Method 3015 - safeguards against handling damage in manufacturing and field service environments. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems including industrial controllers and test equipment. |
| Input Clamp Current | –18 mA - defines safe negative input voltage margin when clamping diodes are active, critical for fault-tolerant bus design. |
| Power-Down Leakage | 0.1 mA (IIO(off)) - ensures minimal bus loading when VCC = 0, supporting true hot-swap capability without pull-up conflicts. |
Pinout & Package
SN74BCT29862B is packaged in a 24-pin plastic DIP (NT package), with 10 A-side I/O pins (A1–A10), 10 B-side I/O pins (B1–B10), two independent output-enable inputs (OEAB, OEBA), VCC, and GND. No internal connections exist on pins 3, 12, and 24.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | OEBA, OEAB | Active-low enables: OEBA = L enables B→A; OEAB = L enables A→B; both H isolates both buses. |
| 3 | NC | No internal connection - must be left unconnected or tied to ground per layout best practice. |
| 4–13 | A1–A10 | 10-bit bidirectional data port A - electrically identical to B-port but assigned as primary local bus interface. |
| 14–23 | B1–B10 | 10-bit bidirectional data port B - mirrors A-port functionality; used for remote or expansion bus coupling. |
| 12, 24 | NC | No internal connection - floating pins; avoid routing traces or vias to prevent parasitic coupling. |
| 24 | GND | Ground reference for all I/O and internal logic - requires low-inductance connection to system ground plane. |
| 24 | VCC | Positive supply rail - bypassed with 0.1 µF ceramic capacitor near pin to suppress high-frequency noise. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Reduces standby ICC to 6.5 mA (typ) - cuts power consumption by >50% vs. equivalent bipolar-only transceivers. |
| Independent dual-direction control | Separate OEAB/OEBA inputs allow asymmetric bus arbitration - e.g., A→B enabled while B→A disabled for write-only transfers. |
| Power-up high-impedance state | Prevents bus contention during cold start or brownout - eliminates need for external reset sequencing of bus drivers. |
| TTL-compatible input thresholds | VIH = 2 V, VIL = 0.8 V - ensures interoperability with legacy 74LS, 74ALS, and microcontroller GPIOs without level shifters. |
| Hot-swap capable I/O | IIO(off) = 0.1 mA at VCC = 0 - permits live insertion into powered backplanes without disrupting adjacent devices. |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
|
Use Scenario: Connecting a modern controller module to an aging 10-bit parallel bus in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Bidirectional bus bridge that translates timing and drive strength between new and legacy subsystems. Use Value: Eliminates need for custom FPGA glue logic by providing pin-compatible replacement for obsolete 29862-family transceivers with enhanced ESD and lower ICC. |
Use Scenario: Expanding address/data bus width in retro-computing restoration projects using vintage 8086/80286-based motherboards. IC Role / Device Role / Timing Role: 10-bit bidirectional buffer with isolated enable control for adding peripheral cards without modifying original bus timing. Use Value: Matches 74ALS29862 timing specs while delivering +100% output current margin, improving signal integrity over long trace runs. |
| Test Equipment Data Acquisition | Automated Manufacturing Fixture |
|
Use Scenario: Isolating DUT (device under test) signals from measurement instrumentation in automated IC testers. IC Role / Device Role / Timing Role: Directionally gated bus coupler that prevents back-driving of sensitive analog front-ends during digital stimulus phases. Use Value: High-impedance isolation mode (both OEs high) guarantees zero leakage path between test channels, preserving measurement accuracy. |
Use Scenario: Interfacing programmable logic controllers to pneumatic valve banks in SMT placement machines. IC Role / Device Role / Timing Role: Robust 10-bit I/O expander with fault-tolerant enable logic for real-time actuator command distribution. Use Value: ±48 mA drive supports direct driving of opto-isolated relay inputs, reducing component count and board space vs. discrete driver solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS29862N | Higher ICC (25 mA typ), slower tPLH (10 ns max), no BiCMOS power savings | Limited to lower-speed legacy systems where thermal budget allows higher dissipation | Choose only if strict ALS-family timing compliance is required and power efficiency is secondary. |
| SN74ACT29862N | CMOS-compatible VIH/VIL (3.5 V/1.5 V), 5.5-V absolute max rating, faster tPLH (4.5 ns typ) | Requires 3.3-V or mixed-voltage system integration; not TTL-input compatible | Select when interfacing with ACT-family logic or when sub-5 ns timing is mandatory and voltage levels permit. |
Compared with SN74ALS29862N and SN74ACT29862N, the SN74BCT29862B uniquely balances TTL-level compatibility, 5-V operation, low standby current, and proven industrial reliability-making it optimal for drop-in upgrades in existing 5-V backplane designs where power and ESD robustness matter.
Availability
SN74BCT29862B is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, and automated test equipment requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN74BCT29862B 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 SN74BCT29862B belongs to TI's BCT (Bipolar-CMOS Transceiver) logic family, engineered specifically for high-reliability 5-V bus bridging in mission-critical industrial and test systems where TTL compatibility, ESD resilience, and power efficiency are jointly essential.
FAQ
What is the maximum operating temperature range for the SN74BCT29862B?
The SN74BCT29862B is characterized for operation from 0°C to 70°C, making it suitable for commercial and industrial ambient environments. This range is distinct from the SN54BCT29862B variant, which supports –55°C to 125°C for military applications. Thermal derating is not required within this specified range, and full electrical performance is guaranteed across the entire span.
Does the SN74BCT29862B support true bidirectional data flow without external logic?
Yes, the SN74BCT29862B supports fully independent bidirectional data flow using its two dedicated output-enable inputs: OEAB controls A→B transmission, and OEBA controls B→A transmission. When both are high, both ports enter high-impedance isolation. No external gates or direction-control logic are needed, simplifying PCB layout and reducing BOM count in bus arbitration designs.
Can the SN74BCT29862B be used in hot-swap applications?
Yes, the SN74BCT29862B is explicitly designed for hot-swap use: its outputs remain in high-impedance state during power-up/down, and its power-off bus leakage current (IIO(off)) is limited to 0.1 mA at VCC = 0. These features prevent bus contention and signal corruption when inserted into a live 5-V backplane, satisfying key requirements for modular industrial and telecom equipment.
What is the recommended bypass capacitance for the SN74BCT29862B VCC pin?
A 0.1 µF ceramic capacitor placed as close as possible to the VCC pin (pin 24 in NT package) is recommended to suppress high-frequency noise and stabilize supply voltage during fast output transitions. For systems with heavy simultaneous switching, a parallel 4.7 µF tantalum or polymer capacitor at the board-level power entry point further improves low-frequency decoupling and reduces ripple-induced jitter.
Is the SN74BCT29862B functionally equivalent to the AMD Am29862A?
Yes, the SN74BCT29862B is functionally equivalent to the AMD Am29862A and the TI SN74ALS29862, as confirmed in the official datasheet SCBS014B. Pinout, timing, logic behavior, and DC specifications match across these parts, enabling direct substitution in legacy designs-though the SN74BCT29862B offers superior ESD protection and lower standby current due to its BiCMOS process.
SN74BCT29862BNT 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:
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- Mounting Type:
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- Supplier Device Package:
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SN74BCT29862BNT FAQ
1.How can I place an order for SN74BCT29862BNT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT29862BNT 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 SN74BCT29862BNT reliable?
The price and inventory of SN74BCT29862BNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT29862BNT is usually 5 days.
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Once your SN74BCT29862BNT 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 SN74BCT29862BNT?
For technical support, including SN74BCT29862BNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT29862BNT requirements.
6.How does Aetrix verify that SN74BCT29862BNT is sourced from the original manufacturer or authorized distributors?
All SN74BCT29862BNT 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 SN74BCT29862BNT meets industry standards.
7.What is the process for return or replacement of SN74BCT29862BNT?
All SN74BCT29862BNT units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT29862BNT, 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 SN74BCT29862BNT part is unused and in its original packaging.
Return procedure for SN74BCT29862BNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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