Texas Instruments SN64BCT29828BNT

Overview

SN64BCT29828BNT from Texas Instruments is a 10-bit non-inverting buffer/driver with dual active-low 3-state enable inputs (OE1, OE2), BiCMOS logic architecture, 5-V supply operation, and 24-pin PDIP package. It drives high-capacity bus lines or memory address registers while maintaining high-impedance outputs during power-up/down. Used in wide-data-path bus interface applications requiring low ICCZ and ESD-hardened I/O.

For engineers reviewing the SN64BCT29828BNT datasheet, SN64BCT29828BNT pinout, SN64BCT29828BNT application, or SN64BCT29828BNT equivalent, key selection considerations include dual 3-state control logic, ±50 µA power-up/down leakage, 48 mA sink capability, flow-through pinout for PCB layout optimization, and compatibility with TTL-level input thresholds.

Technical Context

This device implements a dual-gated 3-state output control using two active-low AND logic inputs (OE1 and OE2), ensuring all ten Y outputs enter high-impedance state if either enable is high. Its BiCMOS design integrates bipolar drivers with CMOS input stages to achieve high current drive (48 mA sink) while minimizing quiescent supply current (ICCZ ≤ 6 mA).

The P-N-P input structure reduces DC loading on driving sources, and the flow-through architecture aligns inputs (A1–A10) and outputs (Y1–Y10) on opposite sides of the 24-pin DIP package. Outputs remain high-impedance during VCC ramp-up and ramp-down, preventing bus contention in hot-swap or power-cycled systems.

Key Specifications

Pinout & Package

SN64BCT29828BNT is supplied in a 24-pin plastic dual in-line package (PDIP, NT package drawing), with 0.3-inch body width and through-hole mounting. Pin 1 is marked by a notch or dot; pin numbering follows standard DIP convention (counter-clockwise from top-left corner).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit buffer/driver applications.

Compared with SN74BCT29828N and SN64BCT29828BDW, the SN64BCT29828BNT provides full industrial temperature support (–40°C to 85°C) in a through-hole package ideal for prototyping, repair, and legacy systems-while retaining identical timing, drive strength, and 3-state behavior.

Availability

SN64BCT29828BNT is available at Aetrix Electronics and suitable for memory address buffering, backplane data bus interface, industrial PLC I/O expansion, and legacy ISA bus extension requiring stable component supply despite its obsolete status.

Supply support for SN64BCT29828BNT 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 reach.

The SN64BCT29828BNT belongs to TI's BCT logic family, designed specifically for high-speed, high-drive 5-V bus interface applications where low ICCZ, robust ESD tolerance, and power-cycle-safe 3-state behavior are critical.

FAQ

What is the operating temperature range for SN64BCT29828BNT?

The SN64BCT29828BNT is characterized for operation from –40°C to 85°C, meeting extended industrial temperature requirements. This specification is explicitly confirmed in the "recommended operating conditions" table of the SCBS478 datasheet, and distinguishes it from the commercial-grade SN74BCT29828N variant.

Does SN64BCT29828BNT support hot-plug or power-cycle safe operation?

Yes, the SN64BCT29828BNT guarantees high-impedance outputs during power-up and power-down, with measured IOZ ≤ ±50 µA when VCC is between 0 V and 2.3 V or ramping down from 1.8 V. This behavior is documented in the "electrical characteristics" section under IOZ test conditions and prevents bus contention in systems with uncontrolled power sequencing.

What is the logic configuration of the 3-state enable inputs on SN64BCT29828BNT?

The SN64BCT29828BNT uses a dual active-low 2-input AND gate for 3-state control: both OE1 and OE2 must be low for outputs Y1–Y10 to be active (non-high-Z). If either OE1 or OE2 is high, all ten outputs enter high-impedance state - a behavior confirmed in the FUNCTION TABLE and logic diagram of the SCBS478 datasheet.

Can SN64BCT29828BNT drive standard TTL loads directly?

Yes, the SN64BCT29828BNT delivers 48 mA sink current (IOL) and –24 mA source current (IOH), exceeding standard TTL fanout requirements. Its VOH ≥ 2.4 V at IOH = –15 mA and VOL ≤ 0.5 V at IOL = 48 mA ensure valid logic levels into multiple 74LS or 74ALS inputs, as verified in the "electrical characteristics" table.

Is SN64BCT29828BNT pin-compatible with other 10-bit BCT buffers?

The SN64BCT29828BNT shares identical pinout and logic function with SN74BCT29828N (same PDIP-24 package) and SN64BCT29828BDW (SOIC-24), including matching A1–A10, Y1–Y10, OE1, OE2, VCC, and GND assignments. This pin compatibility is confirmed by TI's packaging information table and logic symbol diagrams in SCBS478.