Texas Instruments SN74BCT29864BNT

Overview

SN74BCT29864BNT from Texas Instruments is a 9-bit BiCMOS transceiver for asynchronous bidirectional data bus communication, featuring dual OEAB/OEBA control inputs, 5-V supply operation (4.5–5.5 V), 48 mA sink current capability, and power-up high-impedance outputs. It enables flexible A↔B or B↔A data flow in industrial backplane and legacy system interconnects.

For engineers reviewing the SN74BCT29864BNT datasheet, SN74BCT29864BNT pinout, SN74BCT29864BNT application, or SN74BCT29864BNT equivalent, key selection criteria include its 9-bit bidirectional latch mode, BiCMOS standby current reduction, 5-V TTL-compatible I/O, and NT-package thermal and mechanical constraints for through-hole PCB integration.

Technical Context

This device implements independent dual-output-enable logic (OEAB1/OEAB2 and OEBA1/OEBA2) to select direction (A→B, B→A) or latch both buses simultaneously. Its BiCMOS process delivers TTL-level output drive with CMOS-like input leakage and reduced ICC in disabled states.

The transceiver supports hot-insertion-safe operation via power-up high-impedance outputs and exceeds 2000 V ESD protection per MIL-STD-883C Method 3015. Timing is characterized across 0°C to 70°C with tPLH/tPHL ≤ 6.1 ns and tPZL/tPLZ ≤ 12.5 ns at CL = 50 pF.

Key Specifications

Pinout & Package

SN74BCT29864BNT uses a 24-pin plastic dual-inline package (PDIP-NT), 300-mil width, through-hole mountable with 0.1-inch lead pitch. Package conforms to JEDEC MS-001 and supports wave soldering and manual rework.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 9-bit bidirectional transceiver applications.

Compared with SN74BCT29864BNT, SN74ALS29864N increases active power by ~3× and lacks guaranteed Hi-Z at power-on, while Am29864A provides identical electrical and mechanical behavior with full second-source qualification for extended lifecycle planning.

Availability

SN74BCT29864BNT is available at Aetrix Electronics and suitable for industrial backplane interconnect, legacy system bus extension, and modular PLC I/O carrier designs requiring stable component supply and long-term obsolescence management.

Supply support for SN74BCT29864BNT 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 SN74BCT29864BNT belongs to TI's BCT-family of BiCMOS bus transceivers, engineered specifically for high-drive, low-quiescent-current interfacing between TTL-compatible subsystems in commercial-temperature industrial control equipment.

FAQ

What is the maximum clock rate supported by SN74BCT29864BNT?

SN74BCT29864BNT does not include an internal clock; it is an asynchronous transceiver. Its usable data rate depends on external timing control and load conditions. With CL = 50 pF and R1/R2 = 500 Ω, propagation delays are ≤6.1 ns, supporting reliable handshaking up to approximately 80 MHz in well-terminated systems. The SN74BCT29864BNT datasheet specifies no minimum pulse width, making it suitable for irregular or event-driven bus protocols.

Does SN74BCT29864BNT support hot-plug operation?

Yes - SN74BCT29864BNT features guaranteed power-up and power-down high-impedance outputs, preventing bus contention during insertion or removal. This behavior is explicitly characterized in the absolute maximum ratings and functional description. When VCC is below 1 V, outputs remain Hi-Z, making SN74BCT29864BNT appropriate for modular backplane architectures requiring live module replacement without system reset.

Can SN74BCT29864BNT interface directly with 3.3-V logic?

No - SN74BCT29864BNT is a 5-V-only device with VIH = 2 V and VIL = 0.8 V, but its outputs swing rail-to-rail (0 V to VCC). Driving a 3.3-V input may exceed absolute maximum input voltage (−0.5 V to 5.5 V), risking damage or latch-up. For 3.3-V interfacing, SN74BCT29864BNT requires level-shifting circuitry or a compatible 5-V tolerant receiver. Always verify input clamp current limits before interconnection.

What is the function of the dual OE inputs (OEAB1/OEAB2 and OEBA1/OEBA2) on SN74BCT29864BNT?

The dual OE inputs provide fault-tolerant direction control: both OEAB1 and OEAB2 must be low to enable A→B transmission; both OEBA1 and OEBA2 must be low to enable B→A transmission. This redundancy reduces risk of accidental bus contention due to single-point control signal failure. In latch mode, all four OE inputs low freezes data on both buses - a feature confirmed in the SN74BCT29864BNT function table and used in synchronous capture applications.

Is SN74BCT29864BNT RoHS compliant?

Yes - SN74BCT29864BNT is marked Pb-Free (RoHS) with CU NIPDAU lead finish and complies with EU RoHS Directive 2011/65/EU. The "NT" package suffix indicates a lead-free PDIP variant, and TI's packaging addendum confirms RoHS status for orderable part SN74BCT29864BNT. No exemptions apply; homogeneous lead content is below 0.1% by weight.