Texas Instruments SN74ABT162825DLR

Overview

SN74ABT162825DLR from Texas Instruments is an 18-bit 3-state buffer/line driver with integrated 25-Ω series output resistors, designed for memory address and clock bus driving in high-density digital systems. It operates at 4.5 V to 5.5 V, supports hot insertion via I_off and power-up 3-state, and delivers ±12 mA drive strength per output with <1 V ground bounce at 5 V.

For engineers reviewing the SN74ABT162825DLR datasheet, SN74ABT162825DLR pinout, SN74ABT162825DLR application, or SN74ABT162825DLR equivalent, this device is selected for high-speed bus interface integrity, PCB layout optimization via flow-through architecture, and robust power sequencing in industrial and telecom backplane designs.

Technical Context

The SN74ABT162825DLR implements two independent 9-bit noninverting buffers, each controlled by a dual-input AND gate with active-low OE1/OE2 inputs - enabling full 18-bit or split 9-bit operation. Its outputs feature built-in 25-Ω series termination to suppress overshoot/undershoot without external components.

It integrates distributed V_CC/GND pins and power-up 3-state logic to minimize switching noise and prevent bus contention during power transitions. The I_off circuitry ensures ≤±100 µA leakage when V_CC = 0 V, enabling safe hot-insertion into live backplanes.

Key Specifications

Pinout & Package

SN74ABT162825DLR is housed in a 56-pin Plastic Small-Outline Package (SSOP-DL), 10.2 mm × 22.0 mm footprint, 0.635 mm pitch, JEDEC MO-118 compliant, with gull-wing leads and exposed thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 18-bit 3-state buffer applications.

Compared with SN74ABT162825DLR, SN74ABT16244DLR offers fewer bits and no built-in termination, increasing BOM count and layout complexity, while SN74LVC16244ADGGR lacks 5-V compatibility and hot-insertion support - making SN74ABT162825DLR uniquely suited for robust, high-density 5-V bus interfacing.

Availability

SN74ABT162825DLR is available at Aetrix Electronics and suitable for memory subsystems, telecom backplanes, industrial PLCs, and embedded computing platforms requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for SN74ABT162825DLR 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 over 50 years of innovation in high-reliability interface and bus technologies.

The SN74ABT162825DLR belongs to TI's Widebus™ family - engineered for high-speed, high-density memory and bus interface applications where signal integrity, hot-swap safety, and PCB layout efficiency are critical design constraints.

FAQ

What is the operating voltage range for SN74ABT162825DLR?

The SN74ABT162825DLR operates over a supply voltage range of 4.5 V to 5.5 V. This 5-V nominal range ensures full compatibility with TTL and ABT logic families, supports stable performance across industrial temperature conditions (−40°C to 85°C), and maintains specified output drive strength and timing parameters within this window. Operation outside this range may compromise functionality or reliability.

Does SN74ABT162825DLR support hot insertion, and how is it implemented?

Yes, SN74ABT162825DLR supports hot insertion through two integrated features: I_off circuitry limits current backflow to ≤±100 µA when V_CC = 0 V, and power-up 3-state logic forces all outputs into high-impedance during V_CC ramp-up/down. These mechanisms prevent damage and bus contention when inserting the device into a live backplane - a key requirement in modular telecom and server systems.

How many output enable inputs does SN74ABT162825DLR have, and what is their logic behavior?

SN74ABT162825DLR has four active-low output-enable inputs: 1OE1, 1OE2, 2OE1, and 2OE2 - two per 9-bit section. Each pair forms a 2-input AND gate; if either input is high, all nine corresponding outputs enter high-impedance. This architecture enables flexible bus control - e.g., one OE pair can isolate the first 9 bits while the other drives the second 9 bits - supporting partial bus gating.

What package type and pin count does SN74ABT162825DLR use?

SN74ABT162825DLR uses a 56-pin Plastic Small-Outline Package (SSOP-DL), with dimensions 10.2 mm × 22.0 mm and 0.635 mm lead pitch. It complies with JEDEC MO-118 and features gull-wing leads. The DL suffix explicitly denotes this SSOP variant - distinct from CFP or other packages in the same family - and is optimized for surface-mount assembly in high-density PCBs.

Are external series resistors required for SN74ABT162825DLR outputs?

No, external series resistors are not required for SN74ABT162825DLR outputs. Each output includes an integrated 25-Ω series resistor, specifically designed to dampen overshoot and undershoot on PCB traces and cables. This on-die termination reduces component count, saves board space, and improves signal integrity without requiring layout adjustments for discrete termination.