onsemi 74ABT16652CMTDX

Overview

74ABT16652CMTDX from Fairchild Semiconductor is a 16-bit dual-bus transceiver with D-type registers and independent 3-STATE control, operating at 4.5–5.5 V, supporting 200 MHz clock frequency, 64 mA sink / 32 mA source drive strength per I/O, and real-time or registered data routing between A and B buses in industrial bus interface applications.

For engineers reviewing the 74ABT16652CMTDX datasheet, pinout, applications, or equivalent options, this device enables multiplexed bidirectional data flow with guaranteed output skew, nondestructive hot insertion, and glitch-free high-impedance behavior during power-up/down - critical for backplane, memory expansion, and protocol-agnostic bus bridging designs.

Technical Context

The 74ABT16652CMTDX implements two independent 8-bit register banks (A and B), each with dedicated clock (CPABn/CPBAn), select (SABn/SBAn), and output enable (OEABn/OEBAn) controls. Its logic supports four fundamental modes: real-time A→B or B→A transfer, storage of data on either bus, and simultaneous transfer of stored A-to-B and B-to-A data.

Each I/O pair functions as both input and 3-STATE output, with data latched on LOW-to-HIGH clock transitions regardless of OE or S states. Real-time reinforcement occurs when OEABn and OEBAn are simultaneously active, allowing bus hold without register use - a feature enabled by its dual-control architecture and rail-to-rail input voltage tolerance.

Key Specifications

Pinout & Package

74ABT16652CMTDX is housed in a 56-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 6.1 mm wide, with exposed pad not electrically connected. The package supports fine-pitch surface-mount assembly and thermal dissipation suitable for industrial ambient conditions (−40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit registered transceiver applications.

Compared with SN74ABT16652DGGR and 74FCT16652CTPAG, the 74ABT16652CMTDX delivers highest output drive (64 mA sink) and widest voltage tolerance (−0.5 V to +7.0 V), making it optimal for ruggedized industrial backplanes where signal integrity under marginal conditions is critical.

Availability

74ABT16652CMTDX is available at Aetrix Electronics and suitable for backplane bus interface, memory expansion bridge, and hot-swappable module interface applications requiring stable component supply, long-term lifecycle support, and traceable industrial-grade sourcing.

Supply support for 74ABT16652CMTDX 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

Fairchild Semiconductor was a leading designer of high-performance analog and logic ICs, acquired by ON Semiconductor in 2016; its ABT logic family remains widely deployed in industrial and telecom infrastructure.

The 74ABT16652CMTDX belongs to Fairchild's Advanced BiCMOS Transceiver (ABT) product line, engineered for high-speed, high-drive 5 V bus interface applications demanding reliability across extended temperature ranges and harsh electrical environments.

FAQ

What is the maximum clock frequency supported by the 74ABT16652CMTDX?

The 74ABT16652CMTDX supports a maximum clock frequency of 200 MHz under standard AC test conditions (VCC = 5.0 V, CL = 50 pF). This rating is guaranteed across the full industrial temperature range (−40°C to +85°C) and applies to both CPABn and CPBAn inputs. The 74ABT16652CMTDX achieves this performance through optimized BiCMOS circuitry that minimizes propagation delay variation and ensures timing closure in high-speed parallel bus systems.

Does the 74ABT16652CMTDX support hot insertion without damage?

Yes, the 74ABT16652CMTDX features nondestructive hot insertion capability, verified per manufacturer specifications. Its input protection structure tolerates floating inputs and partial power-up states without latchup or parametric shift. During hot insertion, the 74ABT16652CMTDX maintains high-impedance outputs until VCC stabilizes, preventing bus contention - a key requirement for modular PLC and telecom shelf designs.

What is the output drive capability of the 74ABT16652CMTDX per pin?

The 74ABT16652CMTDX provides 64 mA sink current and 32 mA source current per I/O pin (A0–A15, B0–B15) under specified DC conditions (VCC = 4.5–5.5 V, TA = −40°C to +85°C). This drive strength allows direct interfacing with up to 10 standard TTL loads or driving 100 mm of 50 Ω PCB trace without signal degradation - a capability confirmed in the DC Electrical Characteristics table of the official Fairchild datasheet DS011599.

How does the 74ABT16652CMTDX handle power-up and power-down sequencing?

The 74ABT16652CMTDX ensures high-impedance glitch-free bus loading during entire power-up and power-down cycles. Its internal circuitry holds all outputs in 3-STATE until VCC reaches valid operating range and remains stable through brownout. This behavior is intrinsic to the ABT process and explicitly guaranteed in the datasheet - eliminating need for external power-on reset circuitry when using the 74ABT16652CMTDX in systems with asymmetric supply ramp rates.

Can the 74ABT16652CMTDX operate with mixed-voltage interfaces?

Yes, the 74ABT16652CMTDX accepts input voltages from −0.5 V to +7.0 V independent of VCC, enabling safe interfacing with 3.3 V, 5 V, and legacy 12 V logic families. Its VIH/VIL thresholds (2.0 V/0.8 V at VCC = 5 V) provide 0.5 V noise margin against 5 V TTL, and the 74ABT16652CMTDX maintains full functionality even when input signals exceed VCC - a feature critical for level-shifting in heterogeneous bus architectures.