Texas Instruments SN74BCT2244DWR

Overview

SN74BCT2244DWR from Texas Instruments is an octal noninverting buffer/line driver with 3-state outputs, designed for memory address and bus driving in 5-V TTL-compatible systems. It operates from 4.5 V to 5.5 V, features integrated 33-Ω series output resistors, supports ±12 mA drive capability, and delivers propagation delays as low as 0.5 ns (t_PLH) at 5 V - enabling high-speed bus interfacing in industrial control backplanes.

For engineers reviewing the SN74BCT2244DWR datasheet, SN74BCT2244DWR pinout, SN74BCT2244DWR application, or SN74BCT2244DWR equivalent, key selection criteria include 3-state bus contention control, BiCMOS low ICCZ quiescent current (6.5–10 mA), output impedance matching for signal integrity, and SOIC-20 package compatibility with automated SMT assembly.

Technical Context

This device implements two independent 4-bit noninverting buffer sections (1A1–1A4 → 1Y1–1Y4; 2A1–2A4 → 2Y1–2Y4), each controlled by a dedicated active-low 3-state enable input (1OE, 2OE). Its BiCMOS architecture combines bipolar input stages for TTL-level compatibility and CMOS output stages with integrated 33-Ω series termination to suppress overshoot/undershoot without external components.

Each output is rated for ±12 mA DC drive, supports hot-swap safe 3-state transitions (t_PZH/t_PLZ ≤ 9.1 ns max), and maintains high-impedance state during power sequencing when OE is pulled up to V_CC. Input thresholds (V_IL = 0.8 V, V_VIH = 2.0 V) ensure robust noise margin against TTL logic families.

Key Specifications

Pinout & Package

SN74BCT2244DWR uses a 20-pin SOIC (DW) package measuring 12.83 mm × 5.3 mm × 2.65 mm, with 1.27-mm pitch and gull-wing leads compliant with IPC-7351 land patterns.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Compared with SN74ACT244N and 74LVC244APW, the SN74BCT2244DWR uniquely combines 5-V TTL compatibility, integrated 33-Ω output resistors, and BiCMOS low I_CCZ, making it optimal for legacy industrial backplanes requiring zero-layout-change upgrades and EMI-compliant signal integrity.

Availability

SN74BCT2244DWR is available at Aetrix Electronics and suitable for industrial control backplanes, memory subsystems, and bus interface modules requiring stable component supply across extended product lifecycles.

Supply support for SN74BCT2244DWR 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 SN74BCT2244DWR belongs to TI's BCT (Bipolar-CMOS Transistor) logic family, engineered specifically for high-density, high-speed 5-V bus driving with reduced power consumption and improved signal fidelity over standard TTL.

FAQ

What is the maximum operating temperature range for SN74BCT2244DWR?

The SN74BCT2244DWR is rated for commercial operation from 0°C to +70°C. This temperature specification applies specifically to the DW (SOIC) package variant indicated by the "DWR" suffix. It does not support extended or military temperature ranges - those require SN54BCT2244 variants in J, W, or FK packages. Always verify ambient and junction temperature limits using θ_JA = 58°C/W and actual power dissipation in your layout.

Does SN74BCT2244DWR require external pull-up resistors on its OE pins?

Yes - to guarantee high-impedance outputs during power-up or brownout conditions, both 1OE and 2OE pins of the SN74BCT2244DWR must be tied to V_CC through external pull-up resistors. The minimum resistance value depends on the current-sinking capability of the controlling logic; TI recommends ≥4.7 kΩ for typical 5-V TTL drivers. Leaving OE floating risks undefined output states and potential bus contention.

Can SN74BCT2244DWR drive unterminated 50-Ω PCB traces directly?

Yes - the SN74BCT2244DWR integrates 33-Ω series resistors on all eight outputs, enabling direct connection to 50-Ω controlled-impedance traces without external termination. This design reduces overshoot and undershoot in point-to-point or short-bus configurations. For longer stubs or multidrop topologies, additional end termination may still be required to suppress reflections.

What is the absolute maximum supply voltage rating for SN74BCT2244DWR?

The absolute maximum supply voltage for SN74BCT2244DWR is 7 V, as specified in the Absolute Maximum Ratings table. However, functional operation is guaranteed only within the recommended range of 4.5 V to 5.5 V. Exceeding 5.5 V risks parametric degradation or permanent damage, especially under sustained load or elevated temperature. Always use regulated 5-V supplies with transient suppression.

How many independent 3-state control inputs does SN74BCT2244DWR have?

The SN74BCT2244DWR has two independent active-low 3-state enable inputs: 1OE (pin 19) controls outputs Y1–Y4, and 2OE (pin 2) controls outputs Z1–Z4. This dual-enable architecture allows selective activation of either 4-bit group - for example, using one section for address latching and the other for data gating - without requiring external decoding logic.