onsemi 74ABT652CSC

Overview

74ABT652CSC from Fairchild Semiconductor is an octal transceiver and register IC with independent A/B bus registers, 3-STATE outputs, and dual-clock control (CPAB/CPBA). It supports real-time or registered data transfer between 8-bit buses, delivers 64 mA sink / 32 mA source drive per output, and operates across −40°C to +85°C at 4.5–5.5 V supply. It is used in high-speed bus isolation and multiplexed data routing in industrial backplanes and memory interface subsystems.

For engineers reviewing the 74ABT652CSC datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3-STATE disable timing (tPZL/tPLZ ≤ 6.0 ns), simultaneous switching noise immunity, latchup protection, and SOIC-24 package compatibility with JEDEC MS-013 footprint.

Technical Context

The 74ABT652CSC integrates eight D-type flip-flops per bus (A and B), dual select inputs (SAB/SBA) for multiplexing real-time vs. stored data, and independent output enables (OEAB/OEBA) for directional 3-STATE control. Its logic supports four core bus-management modes: real-time A→B, real-time B→A, stored A→B, and stored B→A transfers - all configurable without external logic.

It features guaranteed AC performance under both 50 pF and 250 pF loads, with propagation delays specified across temperature (−40°C to +85°C) and supply (4.5–5.5 V). Pin-to-pin skew is bounded at 2.5 ns (HL) and 2.0 ns (LH) for 8-output switching, ensuring deterministic timing in synchronous bus systems.

Key Specifications

Pinout & Package

74ABT652CSC is housed in a 24-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300″ wide body (Package Number M24B), with 1.27 mm pitch and surface-mount footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT652N and 74FCT652CTSO, the 74ABT652CSC uniquely balances industrial SOIC packaging, 64 mA drive, and guaranteed 250 pF load timing - making it optimal for ruggedized, high-load bus isolation where layout density and robustness are co-priorities.

Availability

74ABT652CSC is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion subsystems, and legacy bus bridge applications requiring stable component supply, long-term lifecycle support, and JEDEC-compliant SOIC-24 sourcing.

Supply support for 74ABT652CSC 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 U.S.-based semiconductor company specializing in analog and mixed-signal ICs, power management, and logic devices before its acquisition by ON Semiconductor in 2016.

The 74ABT652 belongs to Fairchild's ABT (Advanced BiCMOS Technology) logic family - designed for high-speed, low-noise, and high-drive 5 V TTL-compatible applications in industrial and computing infrastructure.

FAQ

What is the maximum capacitive load supported by 74ABT652CSC with guaranteed timing?

The 74ABT652CSC guarantees AC electrical performance-including propagation delay, enable/disable times, and skew-under both 50 pF and 250 pF load conditions. This dual-load specification ensures reliable operation when driving long traces, multi-drop buses, or multiple downstream inputs without derating. The 250 pF rating is explicitly validated in the extended AC characteristics table for all key timing parameters.

Does 74ABT652CSC support hot insertion, and what design features enable it?

Yes, the 74ABT652CSC supports nondestructive hot insertion per its datasheet. This is enabled by three integrated protections: (1) high-impedance glitch-free bus loading during power-up/down, (2) guaranteed latchup immunity up to ±500 mA, and (3) input voltage tolerance from −0.5 V to +7.0 V - allowing safe connection to live 5 V buses without damage or system upset.

How does the 74ABT652CSC handle simultaneous switching of all 8 outputs?

The 74ABT652CSC is characterized for simultaneous switching of all 8 outputs, with guaranteed specifications including dynamic VOL/VOLP, simultaneous switching noise level, and ICCD < 1.4 mA/MHz. Its architecture minimizes ground bounce and supply sag through balanced output stage design and internal decoupling - critical for maintaining signal integrity in dense parallel interfaces.

Can 74ABT652CSC operate with a 4.75 V supply, and how does that affect timing?

Yes, the 74ABT652CSC is fully specified across 4.5 V to 5.5 V, including 4.75 V. All AC parameters-including max clock frequency (200 MHz), propagation delays (e.g., tPLH ≤ 4.9 ns), and skew (≤ 2.5 ns)-are guaranteed over this full range at −40°C to +85°C. No timing degradation occurs at nominal 4.75 V; only the absolute min/max limits define operational boundaries.

What is the role of SAB and SBA pins in 74ABT652CSC functionality?

The SAB and SBA pins control data path selection: SAB determines whether A→B transfer uses real-time (SAB = HIGH) or stored-A (SAB = LOW) data; SBA similarly governs B→A direction. These inputs work independently of OEAB/OEBA and CPAB/CPBA, enabling flexible multiplexing-e.g., real-time A→B while storing B→A data-without additional logic or state machines.