Texas Instruments 74ABTH162245DLRG4

Overview

74ABTH162245DLRG4 from Texas Instruments is a 16-bit noninverting bus transceiver with 3-state outputs, designed for synchronous two-way data communication between parallel buses. It supports bidirectional A↔B data flow controlled by DIR, features bus-hold on all data inputs, integrates 25-Ω series resistors on A-port outputs, and operates over –40°C to 85°C at 4.5–5.5 V supply.

For engineers reviewing the 74ABTH162245DLRG4 datasheet, 74ABTH162245DLRG4 pinout, 74ABTH162245DLRG4 application, or 74ABTH162245DLRG4 equivalent, this device is selected for high-speed TTL-compatible bus isolation in industrial control backplanes, memory expansion interfaces, and FPGA-to-ASIC data bridging where low ground bounce (<1 V) and flow-through PCB layout are critical.

Technical Context

The 74ABTH162245DLRG4 implements dual 8-bit sections (1A/1B and 2A/2B), each with independent DIR and OE controls, enabling flexible partitioning as two 8-bit transceivers or one unified 16-bit path. Its EPIC-II^B BiCMOS process delivers reduced power dissipation versus standard TTL while maintaining 5-V logic compatibility.

It features distributed V_CC/GND pinning to suppress high-speed switching noise, active bus-hold circuitry eliminating external pull resistors, and output-ground-bounce (V_OLP) under 1 V at 5 V/25°C - critical for signal integrity in dense digital systems.

Key Specifications

Pinout & Package

74ABTH162245DLRG4 uses a 48-pin Shrink Small-Outline Package (SSOP-DL), 0.300-inch body width, with 0.025-inch lead pitch and gull-wing leads. Pin 1 is located in quadrant Q1 per tape-and-reel orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT162245DLR and SN74LVC162245DGGR, the 74ABTH162245DLRG4 uniquely combines 5-V tolerance, bus-hold, and A-port series termination - making it the sole option for robust, resistor-free 5-V bus interfacing in thermally demanding industrial layouts.

Availability

74ABTH162245DLRG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA memory bridges, automated test equipment bus extension, and legacy system data aggregation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74ABTH162245DLRG4 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 for industrial and automotive markets.

The ABTH162245 belongs to TI's Widebus™ family of advanced bus interface devices, engineered specifically for noise-immune, high-speed parallel data transfer in mission-critical industrial control and instrumentation systems.

FAQ

What is the maximum data rate supported by the 74ABTH162245DLRG4?

The 74ABTH162245DLRG4 supports reliable operation up to 200 MHz bus clock rates, based on its worst-case propagation delay of 5.2 ns (B→A) and 6.4 ns (OE→output enable) at CL = 50 pF. Real-world sustained data throughput depends on PCB layout, termination, and load capacitance - but the device's 25-Ω A-port series resistors and distributed power/ground significantly improve signal fidelity at these speeds. The 74ABTH162245DLRG4 is commonly deployed in 100-MHz synchronous backplane applications.

Does the 74ABTH162245DLRG4 require external pull-up or pull-down resistors on its data inputs?

No. The 74ABTH162245DLRG4 includes active bus-hold circuitry on all A- and B-side data inputs, providing ±100 µA holding current to maintain valid logic levels on unused or floating lines. This eliminates the need for external pull resistors, reducing bill-of-materials cost and PCB real estate. The 74ABTH162245DLRG4 achieves this via internal feedback networks that detect and reinforce the last valid input state.

What is the purpose of the 25-Ω series resistors on the A-port outputs of the 74ABTH162245DLRG4?

The integrated 25-Ω series resistors on the 74ABTH162245DLRG4 A-port outputs dampen signal edge overshoot and undershoot caused by transmission-line reflections, especially on unterminated or lightly loaded buses. They reduce EMI and improve signal integrity without requiring discrete components. These resistors are absent on the B-port, which is optimized for higher drive strength (up to 64 mA sink) rather than source termination.

How should OE be handled during power-up to ensure high-impedance state for the 74ABTH162245DLRG4?

To guarantee 3-state isolation during power-up or power-down, OE must be held high (disabled) until V_CC stabilizes. TI recommends tying OE to V_CC through a pull-up resistor; the minimum value is determined by the current-sinking capability of the driving logic - typically 4.7 kΩ suffices for standard TTL drivers. This prevents bus contention or undefined output states before system initialization completes. The 74ABTH162245DLRG4 does not include internal power-on reset for OE.

Is the 74ABTH162245DLRG4 pin-compatible with other packages in the ABTH162245 family?

Yes - the 74ABTH162245DLRG4 shares identical pinout and function mapping with SN74ABTH162245DGGR (TSSOP-48) and SN74ABTH162245DGV (TVSOP-48). All variants use the same 48-pin topology, including DIR, OE, A/B I/O, V_CC, and GND placements. However, mechanical dimensions, thermal resistance (θ_JA = 94°C/W for DL vs. 89°C/W for DGG), and packaging (tube vs. tape-and-reel) differ - requiring layout verification for thermal and assembly compatibility.