Texas Instruments SN74ABT2827DWR

Overview

SN74ABT2827DWR from Texas Instruments is a 10-bit noninverting buffer/driver with 3-state outputs, designed for high-speed bus interface in wide data paths and parity buses. It operates from 4.5 V to 5.5 V, supports –40°C to 85°C ambient temperature, features integrated 25-Ω output series resistors, and delivers ±12 mA drive capability per output.

For engineers reviewing the SN74ABT2827DWR datasheet, SN74ABT2827DWR pinout, SN74ABT2827DWR application, or SN74ABT2827DWR equivalent, key selection criteria include its dual active-low 3-state enable (OE1/OE2), flow-through pinout for optimized PCB layout, EPIC-II^B BiCMOS process for low power dissipation, and latch-up immunity exceeding 500 mA per JEDEC JESD-17.

Technical Context

This device implements a true (noninverting) logic function with two independent 3-state enable inputs feeding a 2-input AND gate - either OE1 or OE2 high forces all ten Y outputs into high-impedance. Its flow-through architecture places inputs on one side (pins 1–11, 13) and outputs on the opposite side (pins 14–24, 12), minimizing trace crossovers on dense PCBs.

The SN74ABT2827DWR uses Texas Instruments' EPIC-II^B BiCMOS technology to achieve typical propagation delays of 1.1 ns (t_PLH/t_PHL) at 5 V, while maintaining low ground bounce (V_OLP < 1 V) and robust ESD/latch-up performance. Output terminals integrate 25-Ω series resistors to suppress overshoot/undershoot without external components.

Key Specifications

Pinout & Package

SN74ABT2827DWR is housed in a 24-pin SOIC (DW) package with 300-mil body width, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit 3-state buffer applications.

Compared with SN74ABT244DW and SN74LVC244APW, the SN74ABT2827DWR uniquely supports 10-bit buses with dual OE control and built-in termination in a 5-V industrial environment - making it irreplaceable for parity-enabled memory expansion and military-grade backplane interfaces.

Availability

SN74ABT2827DWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion subsystems, communications protocol bridges, and test equipment signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74ABT2827DWR 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 specializing in analog, embedded processing, and logic solutions, with decades of heritage in high-reliability interface ICs.

The ABT logic family - including SN74ABT2827DWR - was engineered for high-speed, low-noise 5-V bus interfacing in industrial, telecom, and computing systems where signal integrity and latch-up immunity are critical.

FAQ

What is the recommended power-up sequence for SN74ABT2827DWR to ensure reliable 3-state behavior?

TI recommends tying OE1 and OE2 to VCC through pullup resistors during power-up and power-down to guarantee outputs remain in high-impedance until valid control signals are established. The minimum resistor value depends on the driver's current-sinking capability - typically 4.7 kΩ suffices for most 5-V systems. This prevents bus contention and ensures deterministic startup behavior for SN74ABT2827DWR in systems with asynchronous power rails.

Does SN74ABT2827DWR support hot-swap or live-insertion applications?

SN74ABT2827DWR is not specifically characterized for hot-swap operation, but its robust absolute maximum ratings - including –0.5 V to 7 V on inputs/outputs and 500 mA latch-up immunity - provide margin for controlled insertion scenarios. For full hot-swap compliance, external protection circuitry (e.g., current-limiting FETs and TVS diodes) is required. The SN74ABT2827DWR itself does not include built-in hot-swap controllers or slew-rate limiting beyond its 25-Ω series resistors.

Can SN74ABT2827DWR drive unterminated 50-Ω transmission lines directly?

No - SN74ABT2827DWR's integrated 25-Ω series resistors are optimized for suppressing reflections on short, lightly loaded stubs (e.g., <10 cm FR-4 traces), not for matching 50-Ω lines. Driving a true 50-Ω line requires either external series termination (25 Ω added to internal 25 Ω = 50 Ω) or parallel termination at the receiver. Using SN74ABT2827DWR alone on a 50-Ω line results in partial mismatch and residual ringing, especially beyond 25 MHz.

What is the maximum number of SN74ABT2827DWR devices that can be cascaded on a single bus without violating timing budgets?

Timing analysis shows that cascading more than two SN74ABT2827DWR devices introduces cumulative propagation delay >11 ns (2 × 5.5 ns max), exceeding setup requirements for 80-MHz buses. TI's characterization assumes single-stage buffering; for multi-stage designs, derate based on worst-case t_PHL/t_PLH and add interconnect delay. SN74ABT2827DWR is intended for point-to-point or fanout - not daisy-chain - topologies.

Is SN74ABT2827DWR pin-compatible with any ceramic DIP or PLCC variants of the same family?

No - SN74ABT2827DWR uses a 24-pin SOIC (DW) package with specific pinout defined for surface-mount assembly. While the SN54ABT2827 is offered in ceramic DIP (JT) and CERDIP (FK) packages, their pin assignments differ significantly (e.g., JT places GND at pin 12 but VCC at pin 24, whereas DW swaps these positions). Direct PCB replacement is not possible; redesign is required to migrate from SN74ABT2827DWR to through-hole variants.