NXP Semiconductors 74ABT2245DB,118

Overview

74ABT2245DB,118 from NXP Semiconductors (formerly Philips) is an octal bidirectional 3-State transceiver with integrated 30 Ω series output termination resistors, non-inverting logic, and separate direction (DIR) and output enable (OE) controls. It operates from 4.5 V to 5.5 V, delivers ±32 mA drive strength, and achieves 3.9 ns typical propagation delay (An↔Bn) at 5 V with 50 pF load. It is used in high-speed bus interface applications including memory address/data buses and clock distribution networks.

For engineers reviewing the 74ABT2245DB,118 datasheet, 74ABT2245DB,118 pinout, 74ABT2245DB,118 application, or 74ABT2245DB,118 equivalent, key selection criteria include its built-in 30 Ω series termination (eliminating external resistors), live insertion capability, power-up 3-State behavior, and compatibility with ABT-family timing and drive requirements in industrial and telecom backplane designs.

Technical Context

The 74ABT2245DB,118 implements a dual-rail BiCMOS architecture optimized for low dynamic power and high-speed bus interfacing. Its DIR input selects data flow direction (A→B or B→A), while active-low OE independently disables all outputs into high-impedance state - enabling cascading and bus arbitration without external logic.

Each I/O pin integrates matched 30 Ω series resistance in both HIGH and LOW output states, reducing transmission-line reflections and overshoot/undershoot in 50 Ω–75 Ω trace environments. Inputs are fully disabled during 3-State mode, preventing floating-bus contention and leakage paths.

Key Specifications

Pinout & Package

74ABT2245DB,118 is housed in a 20-pin plastic shrink small outline package (SSOP), body width 5.3 mm, JEDEC MO-153 compliant, with 0.65 mm lead pitch and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal transceiver applications.

Compared with 74ABT2245DB,118, the 74ABT245D,118 offers identical functionality in a larger SO package better suited for manual assembly and thermal management, while SN74ABT245N provides equivalent performance with TI-specific validation - neither is pin-compatible due to differing package dimensions and land patterns.

Availability

74ABT2245DB,118 is available at Aetrix Electronics and suitable for industrial control systems, telecom backplanes, and embedded memory expansion modules requiring stable component supply across long production lifecycles.

Supply support for 74ABT2245DB,118 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

NXP Semiconductors, formerly Philips Semiconductors, is a global leader in high-performance logic and interface ICs, with deep heritage in ABT, LVT, and AHC families for industrial and communications markets.

The 74ABT2245DB,118 belongs to NXP's ABT-series advanced BiCMOS logic line, designed specifically for high-speed, low-noise bus interfacing in noise-sensitive telecom, instrumentation, and real-time control systems.

FAQ

What is the maximum operating frequency supported by the 74ABT2245DB,118?

The 74ABT2245DB,118 does not specify a maximum clock frequency directly, but its 3.9 ns typical propagation delay (An↔Bn, CL = 50 pF, VCC = 5 V) supports reliable data transfer at up to 200 MHz in well-terminated point-to-point configurations. System-level timing must account for board trace delays and setup/hold margins, especially in multi-drop bus topologies where the 30 Ω series termination helps maintain signal integrity.

Does the 74ABT2245DB,118 require external pull-up or pull-down resistors on DIR or OE?

No, the 74ABT2245DB,118 does not require external biasing on DIR or OE. Both inputs have CMOS-compatible thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and exhibit ±1.0 µA max input leakage over temperature. Direct connection to FPGA GPIOs, microcontroller pins, or dedicated control logic is sufficient - no pull resistors are needed unless system-level noise immunity mandates them.

Can the 74ABT2245DB,118 be used in mixed-voltage systems (e.g., 3.3 V logic driving its inputs)?

The 74ABT2245DB,118 accepts input voltages from 0 V to VCC (4.5–5.5 V), so 3.3 V logic signals meet its VIH (≥2.0 V) and VIL (≤0.8 V) thresholds reliably. However, its outputs swing rail-to-rail (0 V to VCC), so interfacing with 3.3 V receivers requires level translation or clamping to avoid overvoltage damage - the 74ABT2245DB,118 itself is not 3.3 V tolerant on outputs.

How does the 30 Ω series termination in the 74ABT2245DB,118 improve signal integrity?

The 30 Ω series termination in the 74ABT2245DB,118 matches typical PCB trace impedances (50–75 Ω) when combined with receiver input capacitance, reducing reflections at the source end. This lowers overshoot/undershoot, minimizes ringing on edges, and improves eye diagram opening - verified in applications like memory address drivers and clock distribution where trace lengths exceed 10 cm.

Is the 74ABT2245DB,118 pin-compatible with the 74LS245 or 74HC245?

No, the 74ABT2245DB,118 is not pin-compatible with 74LS245 or 74HC245. While all three share the same 20-pin SSOP/SO footprint and basic pin functions (DIR, OE, A0–A7, B0–B7, GND, VCC), the 74ABT2245DB,118 places B7 on pin 11 and B0 on pin 18 - matching ABT-family conventions but reversing the B-side order of older families. Physical placement requires verification against the exact pin configuration diagram for 74ABT2245DB,118.